This Little Piece Almost Destroyed My Engine...
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- Опубликовано: 10 апр 2022
- In this video, I remove the engine from my lawn tractor for the third time thinking the compression release mechanism failed yet again. Upon tear down, I find a few troubling things including the culprit that was making the engine run so poorly. There was another surprise that I couldn't believe...
The back story on this engine is that it's been opened twice due to faulty compression release mechanisms. When the CRM fails, it requires a camshaft replacement. I used only B&S parts and still these mechanism continue to fail. This is a common problem and many owners have had to deal with it. After removing the camshaft, I inspect the CRM and find that it's functioning properly, so what gives? Follow along to find out!
Torque values:
Crankcase: 220 inch pounds
Oil Pump cover: 90inch pounds
Valve Lash Values:
Intake: .002 - .004
Exhaust: .004 - .007
Part Numbers:
Camshaft: 84005207
Crankcase Gasket: 697110 
Хобби
Great video Jason I was shocked at the thought of you having to replace the camshaft again. I have the same Briggs & Stratton 21HP on my 2013 Craftsman YT 3000 running 800 hours strong (knock on wood) and commented on your excellent camshaft replacement & valve adjustment videos in the past. I have seen on other videos where no starting issues were caused by those valve stem caps coming off caused by a loose valve lash or from the threaded rocker arm studs loosing up in the block and backing out, but luckily for most of them they stayed inside the valve cover area and out of the crankcase avoiding more damages. I adjusted my valve lash last cutting season after 750 appropriate engine hours and your instructions helped me tremendously but I also initially checked the clearances for curiosity sake and found them to be pretty loose at 0.009 in. & 0.10 ex. so I adjusted them @ .004 in. & .006 ex. and also checked those rocker studs to avoid this to happen. Always enjoy seeing your videos with your good knowledge and work practices!
Wow, 800 hours and no failures? That’s incredible. I wish I knew of the valVe stem caps prior to splitting the case, but you live and learn.
Thanks for the great comment. It means a lot and thank you. 👍👍👍
Valve lash cap which protects the valve stem plus cheap rockers
Yes
Are all of the intake and exhaust valves lashes the same throughout Briggs& Stratton lawn mowers? I have a 19 horse that I want to do And it's a 2019. The engine model says it is. That's what year
Honestly, I have no idea. I would guess not, however. If the engine is in the same series then maybe, but better double check and be sure. I wish I could point you to a reliable source for information, but the small engine world is hyper-confusing regarding tolerance values and finding parts. Are noticing noise from the valves? In other words, unless you hear a problem or just plain have a problem, I wouldn’t mess with it. Usually the lawn mower engines don’t need much maintenance on the valves…subjective I know.
Can you show a video of how the carb and throttle linkage is assembled
Hello. This should help.
Lawn Tractor Throttle Linkage Repair
ruclips.net/video/b1rthpVdrjk/видео.html
Hey Man GREAT VIDEO!!
I have a Craftsman YT3000 with your favorite Bridge and Stratton engine. Tractor is over 11yrs old and who knows the hrs! This is the 1st time that it's not working. It was diagnosed by many companies that it COULD be the camshaft broken but nobody have opened the engine yet. I have been manually turning the flying wheel until now that isn't turning up anymore. Do you think that adjust the valves could fix the problem to avoid buy a new camshaft? I have quotes on average about $500.00 but I'm afraid to spend all that money for a fix of just a couple of months. Thanks for your assistance
Hello! If I’m understanding, you’ve been manually turning the flywheel to start the engine, yes? But now it won’t start? If that’s the case it may well indeed be the valve lash needs to be adjusted. That’s where you should start. You’ll need to comb through Google to figure out what the tolerances are, but once you do give the adjustment a try. If it still doesn’t start and you’ve exhausted all other possibilities I’d say it’s likely the cam needs to be replaced. If you’re mechanically inclined you can do this yourself for about $100 or less if you don’t buy the B&S cam. I don’t think anyone can give you a definitive answer as to what’s wrong until you split the case and dive into the intervals. It’s a pain, but knowing how to fix it is invaluable as these cams tend to fail. Best of luck and feel free to update this thread with your findings 👍
Is anybody know what the torque of the sump pump bolts are?
Hello. Do you mean the oil pump? I assume so…. Anyway, 90 inch pounds.
What size socket did you use to turn it over with your drill?
I don’t remember