The Smartest Reason for Correct Valve Clearances!
HTML-код
- Опубликовано: 5 июл 2023
- Full video here: • The Only Video You'll ...
Introducing my other Channel "Things to Know" - which i'm just getting started. It's a go-to channel for insightful worldly explanations, handy tips, and expert advice on everyday things and repairs of domestic items. Here is the link: / @thingstoknow3645
There can be a number of problems that negatively affect the performance and dependability of the engine if the valve clearances are not set properly. The following are some possible effects of using inappropriate valve clearances:
Noise in the valve train might be caused by insufficient valve clearance. When the valves make contact with the rocker arms or cam followers, they could generate a ticking or tapping noise. On the other side, excessive valve clearance can cause a loud knocking sound as the parts of the valve train collide. These annoying noises are a sign of incorrect valve clearance settings.
Poor Engine Performance: Poor engine performance can result from incorrect valve clearances in a number of ways. A loss of compression may result from the valves' inability to fully close if the clearances are too tiny (tight). Reduced power output, poor fuel efficiency, and probable fires might result from this. On the other hand, high clearances (loose) might alter the timing of the valves, which will lead to inefficient combustion and poorer engine performance.
Increased Wear and Damage: Improper valve clearances might put too much stress on the parts of the valve train. The valves and seats may prematurely wear if the clearances are excessively tight and the valves stay slightly open. Due to this wear, the sealing effectiveness may be compromised, leading to compression loss and eventual valve burning. Additionally, if the clearances are excessively slack, the valves may strike the cam followers or rocker arms with too much force, speeding up wear and perhaps leading to component failure.
Interference between the valves and the pistons during their respective strokes is a possibility in engines with small valve clearances. This condition, known as valve-to-piston interference, can seriously harm the pistons and valves, possibly leading to bent pistons and valves as well as catastrophic engine failure.
Reduced Valve Lift: Poor valve clearances can restrict the maximum lift of the valve, which can limit the volume of fuel and air that can be injected into the cylinder as well as the volume of exhaust gases that can be released. The performance of an engine can be hampered by reduced valve lift, which can affect throttle response and power output.
To guarantee good engine functioning, longevity, and top performance, it is crucial to follow the manufacturer's recommendations and recommended valve clearance settings. These problems can be avoided and the health of the engine maintained with frequent valve clearance inspection and adjustment.
Thank you
Craig (Owner and Creator of The Repair Specialist Channel)
#ValveClearance
#EnginePerformance
#ValveTrain
#EngineMaintenance
#ValveAdjustment
#ValveToPistonInterference
#EngineRepair
#ValveLift
#EngineEfficiency
#ValveWear
#AutomotiveMaintenance
#ValveHealth
#InternalCombustion
#ValveTiming
#EngineSafety 
Авто/Мото
Hi guys I just wanted to Introduce to you my other Channel "Kirkman's Academy" - which i'm just getting started. It's a go-to channel for simple explanations for hard to grasp subjects such as physics, maths and chemistry etc. Here is the link: www.youtube.com/@kirkmansacademy/videos . Thank you so much for looking, and if these topics interest you then I hope to see you the there. Many thanks indeed. Craig 😊👍
so for excessesive push on the valve spring (no clearance + extra push) can cause overheating resulting on lean sparkplug reading?
Hi is it good to have a 0.05mm intake and 0.06mm exhaust valve clearance for 125cc pushrod engine?
excellent! how many people now have a clear understanding now as to why they set the clearances. thanks
Hands down the best four-stroke video I have ever seen.
Thank you so much. I really appreciate it. Craig 👍👍👍
Man.. this is genosity. You could be a proffesor ;D
Thank you so much. Craig
I genuinely appreciate you good sir. I am a duck in the desert messing with my sons gocart. This was a real blessing keep up with the spreading of knowledge!
Thank you so much 👍👍👍
Seriously…this Gentleman’s channel is the best of RUclips.
Wow. Thank you. I really appreciate your kind feedback. Craig 👍👍👍👍
Perfect explanation. 🙏 I’m glad I stumbled upon your channel
Nice video. The cutaway motor is a great tool to show this
Thanks 👍
Plenty of videos out there about HOW but this is great to explain WHY. I'm about to adjust the valve clearance on an old Mercedes diesel which I realize is different mechanically but much of this absolutely applies. Well done.
Thank you so much for your kind feedback and good luck with your Mercedes Diesel valve clearance adjustment. Craig 👍
Thank you ! It explain very whell why I have to check my valve clearence often on my motorcycles !
Craig another well put together video. A very thorough explanation of how the valve train functions. Thank you for sharing. 👍
Thanks so much Artie. Craig
Best explanation on RUclips! Bravo
Wow, thanks!
Very thorough guide! Excellent video!
Very nice thats why time to time my motorcycle exhaust note sounds different than the last time we check the clearances... and the engines response too
Excellent Dissertation ! Well Done, Sir !!! 🤓👍
Nice demonstration and explanation. I had a rough understanding of the importance of valve clearances. But, this cleared up a lot of my un-educated guessing as to what exactly was happening. I am nearly certain valve clearance issues are causing rough start and performance issues on my lawn tractor.
I find your information very clear and understandable. Thank you..
And there's a huge slice taken out of the cylinder wall, leading to low compression.
😂👍
I'd be interested in seeing the leak-down test results...
Your the best! Thank you for your teachings!
Really appreciate this explanation
I UNDERSTAND THE WORKINGS OF THE VALVES MUCH BETTER NOW,THANKS TO YOUR BRILLIANT AND INFORMATIVE VIDEO,THANK YOU.
Great visual explanation
Thank you! much easier to understand.
As one wag once said concerning valve clearances, "I'd rather hear 'em than smell 'em"!
I prefer to adjust them at the correct clearance so things aren't slapping around.
Liked, commented and subscribed!! Thank you for the information in such a simple strait forward format. Would love to see a more in depth symptom video from you!
Thank you so much for your kind and motivating comment. Craig 👍👍👍
Loved the clarity and detail, and as a DIY unschooled mechanic, I learned some good points.
Since learning about it, I have been setting my valves as near to "zero-lash" as possible always allowing for pushrod rotation when valve fully closed
I'm delighted to hear that you enjoyed my video on 4-stroke valve clatter/lash and found it helpful for your mechanic endeavors! It's fantastic that you've taken an interest in setting your valves and striving for a "zero-lash" adjustment.
Indeed, paying attention to the finer details like allowing for pushrod rotation when the valve is fully closed can make a significant difference in how your engine performs. It's all about achieving that optimal valve clearance to ensure efficient combustion and minimize noise.
Keep up the great work, and if you ever have more questions or need further advice on any DIY mechanical tasks, feel free to reach out. Learning and hands-on experience are key in this field, and your dedication is truly commendable!
Thanks again
Craig
You got a subscriber. Cool explanation 💯
Well explained, keep up the good work.
Clearly spoken, very well presented.
Good Luck, Be Happy.
Brilliantly explained - thank you!
You're very welcome! Thank you. Craig
That lecture has been so helpful to me
Thank you 👍👍
Great content love your channel
Thanks. Very helpful
Quality content thankyou.👍
Awesome video!! Thanks for your time and knowledge!!
Thank you so much for your kind feedback. Craig 👍👍
Very Enlightening Indeed. How much we take things for Granted. Just Finishing off some work on my 1970 Cortina Mk2 1600 so will definitely look into this area. The engine though is done only about 4000kms since a full overhaul.
Best video I found
Nice job thanks
Very nice explication
Thank you so much for your super informative videos. Really very helpfull. Learning so much.
You are so welcome! Thank you. Craig 👍
Thanks for you video i really like them
Very good info thank you
Best explanation I have ever seen!
THANK YOU
Dam... I did t know of anything about valves and engine, but now I sure do know thanks professor you did great
Thank you so much. Craig
THE BEST EXPLANATION
Thank you for your kind feedback. Craig
great video thanks
Excellent demonstration. Thank you for sharing!!
You are welcome! Thank you
Indeed I gain knowledge in this video
Thanks for sharing very interesting video greetings from mexico
Great visual explanation!
Than you so much 👍
What a brilliant and easy to understand explanation, top job! Liked and subscribed.
Awesome, thank you so much for your kind feedback. I really appreciate it. Craig
Perfect video!!!!
Good one thanks
slow and gets to the point very easilly, woow! great content
Thank you 👍
Thank you so much for explaining, your way of teaching makes so much sense even for my dense head.
Cheers
You're very welcome! Thank you for your feedback. Craig 👍👍👍
GREAT MATE THANK YOU
Than you very much for this very informative technical video. Appreciated a lot.
👍👍👍
So nice of you. Thank you. Craig
Visuals are awesome. TY
Thank you so much 👍👍👍
Thanks brother it's very helpful to watch this
Always welcome
Great explanation. Thank you.
You are welcome! Thank you 👍👍
Very well done sir!
Thank you! Cheers!👍
So great explanation
Thank you so much 🙏
You're most welcome. Thank you
THANKS FOR THE INFORMATION
No problem! Thank you for your feedback. Craig
Great Video Thanks 👌
My pleasure! Thank you. Craig
Great video!
Glad you enjoyed it. Thank you
nice vid
Makes sense
Great!
thank you
You're welcome 👍👍
Very informative, do you now anyware I could find the correct valve setting for a citroen u25 1993. Diesal none turbo..
Good work
Thank you so much 😀
Thank you
You're welcome
Thanks alot🎉
You're very welcome!
One thing about the exhaust valve opening earlier to swirl in air. The exploded gasses are still expanding. When the exhaust is opened, it is done so that the burnt gasses wouldn't push back on the piston creating resistance on the exhaust stroke.
The moment the valve is opened, burnt gasses that are still expanding rush out trough the valve opening (and create the exhaust sound). I don't think air could have a chance at entering the cylinder - at least from my knowledge.
So here’s a question if anybody sees this and wants to chime in. I am looking at doing a valve adjustment on a KTM 390 engine and a lot of the tutorials I found on RUclips adjust the valve clearances on the looser end of the spec range as opposed to the tighter end of the range? They state they do that because they’re worried about the cylinder head hitting the valves. However, based on this video that doesn’t seem likely unless the engine is not timed, right. It also seems less likely on the intake instead of exhaust. In my mind going tighter in the gap range would leave room to wear thus staying in spec longer?
Hello, thanks for the explanation, I have hydraulic lifters, but the valves remain open, I know tha gap you showed there is the problem, but since I have hydraulic lifters I don't know how to solve the problem, could the valves be too long? Or maybe the rocker arms?
Yeah I like it!
What do you think about valve lashes to tight on my Honda rancher 350 trx I have oil coming out my exhaust and blow by tube in air box do you suppose this could be caused from over tight valves
Is it ok to set tappet loose after a fresh engine rebuild? the idea is to let valve seat to adjust properly cause they were built new too.
I find that the toughest part is determining what stroke the engine is on when the flywheel is not marked, so I pull the spark plug and put a screwdriver in the hole and crank the engine until the piston tops out and screwdriver is at its highest point. Both valves are all the way up or in closed position. Then I check clearances with a feeler gauge. On a 9.5 Kohler they say .005 for intake and .007 for exhaust on a cold engine. Does this sound right to you. The engine really gets hot during continuous log splitting operation and smells hot sometimes. I think it needs better cooling system myself as well as a hydraulic oil cooler. I run 30 weight HD motor oil above 60 degrees F and 15w40 Rotella below 60 down to about 35 F. Anything colder gets full synthetic 10w30. The manual also says to ALWAYS run at full throttle. It's a screaming beast of a wood splitter.
Hey there!
Your method of determining the stroke of the engine sounds resourceful-using a screwdriver to gauge the piston's highest point and checking the valve clearances with a feeler gauge is a great way to ensure everything's in sync. Regarding the Kohler 9.5, those clearances (.005 for intake and .007 for exhaust on a cold engine) seem pretty standard for that model. It's crucial to maintain these clearances for optimal engine performance.
It's interesting that the engine heats up significantly during continuous log splitting operations. Improving the cooling system sounds like a smart move, especially considering the demanding nature of the work it's handling. Additionally, the idea of adding a hydraulic oil cooler might help with temperature regulation, ensuring smoother operation during those intense splitting sessions.
Your approach to using different oils based on temperature variations is quite thoughtful. It's essential to adapt the oil viscosity to the ambient temperature, and your choice of motor oil seems well-suited to the engine's needs.
Ah, the manual's advice to always run at full throttle! That certainly paints a vivid picture of your wood splitter as a real powerhouse. It's impressive how it operates at maximum capacity, showcasing its true beastly nature.
Your hands-on approach and attention to detail are commendable. If there's anything else you're curious about or need further assistance with, feel free to reach out. Wishing you continued success in taming that beastly wood splitter!
Thank for sharing your info
Craig
Something else that is notable: It the engine runs out of fuel and dies when the ram is in the up stroke the engine will not start until the lever is put in the center or unloaded position. Owners manuls don't tell you this. Also I finally got spec sheet from Kohler on that valve clearance. It is .003 to .005 for BOTH the intake and exhaust valve. Every shop I called had different numbers here,....the ding bats. I reset both to .004 and it starts and runs much better now and I don't usually have to use the choke any more. Saweeeet. Remember you have a 4 stroke cycle going on and make sure you adjust valve clearance at TDC on the compression stroke. With plug out it is easy to tell. Put finger or thumb in plug hole. You get suction then compression which pushes your finger off the plug hole. TDC or a couple degrees after TDC on COMPRESSION stroke is what you want. Sweet & simple. @@TheRepairSpecialist
Does the incorrect tappets set contributes to more fuel consumption?
Do valve clearances get larger as time goes on? Or do they get smaller? Or can they do both?
Incredible
Thank you so much. Craig 👍👍👍
I heard that valve clearances get tighter over time due to valve seat recession. Is that correct?
Greetings, in short, should the oral cavities be more open or less open? Thanks
Nice explanation 👌 so in theory you want the exhaust valve titer than the fuel valve mate. To keep the temps down. On engine and the let all smoke come out of port
Thank you so much for watching my video on valve clatter, and I appreciate your interest in the topic!
In theory, adjusting valve clearances can indeed have an impact on engine performance and temperature control. However, the specific valve clearance settings can vary depending on the engine design and manufacturer's recommendations. It's not necessarily about having the exhaust valve tighter than the inlet valve, but rather about achieving the correct clearance for each valve.
The main goal is to ensure that the valves open and close at the precise moments as specified by the engine's timing. This allows for efficient combustion, which helps with power output and emissions control. Tighter clearances can sometimes help reduce valve noise and improve low-end torque, but it's essential to consult your engine's manual or the manufacturer's recommendations for the proper valve clearance specifications.
Ultimately, the goal is to maintain a balance between valve clearances to optimize engine performance, minimize noise, and ensure proper sealing. If you have more specific questions about your engine or valve adjustment, don't hesitate to ask, and I'll do my best to assist you further.
I hope this has helped a little
Craig
I was told my warranty was denied for assumed reasoning. The engine failed because a tappet struck the spark plug. How is this possible?
Brilliant
Thank you so much 👍
I'm wondering why there's any suction force in the cylinder during the later part of the power stroke. I thought the pressure in the cylinder at this stage would be higher than atmospheric.
Unless, the expansion of gases during combustion isn't enough to fill the cylinder when the piston is at BDC. Is this a consequence of volumetric efficiency (i.e. no naturally aspirated cylinder is ever 100% filled during the intake stroke) so there's bound to be a slight vacuum at BDC of power stroke?
What am I missing?
Why do the tappets have a ‘side to side’ wiggle to them?
And all this happens lets say 12'000 per minute /superbike. It is 200 times per second! This is incredible!
Yeah. Even at 3,000rpms it's insane to think that piston is up-and-down 50 times a second.
just a mention, did you know that you can increase compression in a lot of applications, by having a larger lash on the intake valve,,,,, why you ask? because just like it takes a little longer to start opening the intake valve when the intake lash, it also closes sooner, so that the piston may not started traveling upwards or traveled upwards as far, giving more stroke of the piston with the valves closed to build compression, basically its a very crude way to change cam timing
Not enough clearance can cause backfiring.
Absolutely 👍
When the air fuel mixture starts off compressed, and is ignited and expands, how could there ever be a vacuum during any point of the power stroke?
Cars heads work off clearances or tolerances tolerances are torque specifications and clearances are as obvious clearances.
Good explanation.
So will my bike start if the exhaust valve is to tite
Thank you so much for your feedback! 😄 I'm glad you found the explanation of the 4-stroke valving system helpful.
Regarding your question about the exhaust valve being too tight, if the exhaust valve clearance is too tight, it can affect the engine's performance. It might make it harder for your bike to start, as it could lead to insufficient exhaust valve lift and compression. However, this also depends on how tight it is and other factors.
If you suspect that the exhaust valve clearance is off, it's a good idea to check and adjust it according to your bike's specifications. Proper valve clearance is essential for optimal engine performance and starting reliability.
If you need guidance on how to check and adjust the valve clearances or have more questions about your bike's maintenance, feel free to ask. I'm here to help! Craig
Hi, nice explanation! Now let me ask You something .. can it (the too big clearance) cause a noticable 'tapping' sound but only for the first 2-3 seconds after cold start? Can the oil 'dampen' the sound if the clearance is already too big, but only a bit? (the sound is not noticable when the engine is warmed up). I'm trying to diagnose the sound I get when cold starting my 1G-FE (Lexus IS200). If You can shed some light it would be awesome.
Anyways, thanks for the video!:)
Hello! I'm glad you found the explanation helpful, and I'd be happy to provide some insights into your cold start tapping sound.
Yes, excessive valve clearance or lash can indeed lead to a tapping sound, especially during the first few seconds after a cold start. When the engine is cold, clearances that are already on the larger side can become more noticeable because the metal components haven't expanded as they do when the engine warms up. As the engine heats up, the clearances can decrease slightly, which may explain why you don't notice the sound when the engine is warmed up.
Oil can act as a dampening agent to some extent by filling the extra clearance space between the valve and the rocker arm or camshaft. So, when the engine is cold, and the oil is thicker, the tapping sound might be more pronounced. As the oil warms up and becomes less viscous, it can provide better cushioning and reduce the noise.
To diagnose and potentially address the issue, you could consider checking and adjusting the valve clearances according to your vehicle's specifications. If you're not comfortable doing this yourself, a qualified mechanic should be able to assist you. Additionally, ensuring that your engine's oil level and viscosity are within the manufacturer's recommendations can also help mitigate valve noise during cold starts.
I hope this sheds some light on your situation, and I wish you success in resolving the tapping sound in your Lexus IS200. If you have any more questions or need further assistance, feel free to ask!
Thanks
Craig
Awesome.
Q. Maybe because that is a. "Mock" engine, but why is there that "square wave" looking ring under the piston rings? I have never seen a piston with anything that looks like that.
It's an "expander" for the Oil Control Ring. That helps the ring exert the correct pressure to the cylinder wall.
How to adjust from hardpully start to smooth pully start.?
thank you for reaching out with your question about adjusting valve clearances to make the recoil easier to pull on your engine.
When you experience difficulty pulling the recoil starter, it could indeed be related to the valve clearances being out of adjustment. The recoil can feel harder to pull if the valve lash (clearance) is too tight, causing increased resistance in the engine's compression stroke.
Here are the general steps to adjust valve clearances, which can help alleviate this issue:
Consult the Manual: Refer to your engine's owner's manual to identify the specific valve clearance specifications for your model.
Prepare the Engine: Ensure the engine is cool and turned off. Remove any necessary components to access the valve cover and rocker arms.
Locate Top Dead Center (TDC): Rotate the engine to the TDC position for the cylinder you are working on. This is typically indicated by aligning timing marks or by positioning the piston at its highest point on the compression stroke.
Check Valve Clearance: Use feeler gauges to measure the clearance between the valve stem and the rocker arm. Compare the measurements to the specified clearances in your manual.
Adjust if Necessary: If the clearance is incorrect, loosen the locknut on the rocker arm and adjust the valve clearance by turning the adjusting screw. Tighten the locknut once the correct clearance is achieved.
Reassemble and Test: Reinstall any removed components, ensuring everything is securely fastened. Start the engine and test the recoil starter to see if the pulling action feels easier.
By following these steps and adhering to your engine's specific specifications, you should be able to adjust the valve clearances effectively. If you're unsure or have difficulty, don't hesitate to consult a professional mechanic or refer to detailed service manuals for your engine model.
I hope this helps guide you through the process of improving the recoil operation on your engine. If you have further questions or need clarification, feel free to ask. Happy tinkering with your engine!
Best regards,
Craig
Sir .. Thank you , very detailed step by step explanation . I am working in tractor diesel engine and we have "Tappet Noise" is the top most problem at our end . I am looking for the way to trouble shoot this concern. The operators follows the SOP of setting the gap on the engine assembly line . However when some of these engines go in the testing we here "Tappet Noise " at Low Ideal speed just start of the the test cycle and at the full load also . Will you please guide us on how to go step by step for the root cause analysis . We did it with one "Good : and One " Bad" engines but it was not leading us to any root cause.
Pl help us.
Thank you
Ajay
Hi
Tackling "Tappet Noise" in tractor diesel engines can indeed be a tricky challenge. It's commendable that you're looking for a systematic approach to troubleshoot and resolve this concern.
When it comes to identifying the root cause of tappet noise occurring during testing, conducting a methodical root cause analysis is key. Here are a few steps that might help you in this process. However please take this as a guide only and to ensure your safety and the safety of your machines are met first and during the operation:
Review Assembly SOP: Double-check the Standard Operating Procedures for tappet adjustment during assembly. Sometimes, even minor deviations during assembly might result in this noise issue.
Check for Consistency: Ensure that the adjustment made during assembly is consistent across all engines. Variations or inaccuracies could lead to tappet noise in some units.
Verify Components: Assess the quality and condition of tappets, pushrods, and related components. Any wear or inconsistencies could contribute to the noise.
Oil Quality and Pressure: Evaluate the oil used for lubrication and ensure it meets specifications. Low oil pressure or poor quality oil might affect tappet performance.
Testing Parameters: Review the test parameters and conditions to replicate the issue consistently. Check if there's any correlation with specific testing conditions leading to tappet noise.
Acoustic Analysis: Consider employing tools for acoustic analysis or sensors to pinpoint the exact source and nature of the tappet noise.
Comparative Analysis: Compare various aspects between 'Good' and 'Bad' engines, including assembly records, test data, and any deviations in parts used or adjustments made.
Professional Assistance: If the issue persists, seeking the advice of expert engineers or specialists might provide new insights into the root cause.
Remember, the key to successful troubleshooting often lies in methodical and systematic analysis.
I hope ths helps a little
Best regards,
Craig
Dear Craig ,
Good Morning..!
Thank you for your immediate response . It is much more in detailed approach for the analysis and made easy for me to understand. Today We have planned analysis with two engines which we have hold for tappet noise . We will follow the step by step approach .
Please help to understand what is the role of .
We have not worked or thought of this aspect ever.
@@TheRepairSpecialist