How To Fix Low Oil Pressure On A Cummins N14
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- Опубликовано: 4 фев 2025
- A thorough explanation of how to fix low oil pressure on a Cummins N14, along with some modification hacks to China pump to possibly extend your oil drain intervals, it's a murder mystery solved
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ANDERSON CONSTRUCTION
858 WEST 100 SOUTH
BLACKFOOT ID 83221
I was a mechanic for Alaska West Express(subsidiary of Lyndon Transport)for a few years. They used carbon spinners on all their engines. Changed the spinner paper at 10,000 mile intervals and the oil at 20,000. Amazing how clean the oil looked with 20,000 miles on it. All their engines had oil retarders which creates a lot of heat.
Sometimes I think your waisted running machinery. My gosh you are so informed on motors, hydraulics, and just about everything that’s made of metal. I throughly enjoyed this series and hope to see another similar in the future.
We are a breed that needs the enjoyment of all the facets of this business.
Traducelo al español.not speak spanish
Traducelo al español.not speak spanish
If you own a construction business, you must do your own mechanic work. Today's mechanics just throw away, they do not fix anything. A smaller contractor can't afford that.
My 93 n14 smokes the same as yours . At first a little then warms up burns really clean. I love my n14 .
Good morning Jeff, thank you for the video and detailed explanation of the oil pump system on your Cummins!! Take care and stay safe 👍😎🇬🇧.
Mr. Anderson if I was a millionaire I would invest in you designing and manufacturing a JPAY Dirt motor.
Iam a 80 year old fan and wished
I was able to watch this series 40 years ago . IT'S MINED EXPANDING .
Me too
When oil is warm its thinner. thinner things fit through smaller gaps, trust me I am not thin, so I know. Thanks for this its confirmation of what I supposed, I learned arly in my career that dirt and tolerances make the most problems.
During my rebuild (failed liner o ring) I used a torch and over heated my oil t-stat, causing it to stay open. Much happier with my oil temps now!
Great series, glad to see that N14 get sorted out. Now time to see Petey doing work!
You and me both!
Good video, I think I actually learnt something. Happy Easter.
Same to you
@@Jpaydirt 😉👍
🤘🤘👍 when the professor speaks folks listin great vid Boss Man!
I appreciate that!
Hey Jeff, I was classically trained at a known University in Ohio, in the Cat/ Cummins class they didn’t go in to this much depth. The biggest thing they told us to look out for was cam follower tolerances on the N14 that we tore down for class. Granted it’s been 20 years for me it’s nice to see one of the biggest issues for this engine and to see the remedy. Awesome job, ever consider being a instructor at a university for having on the job training?
well what I did was cummins blasphemy lol I get a lot of guff from the cummins purests because I say the CAT word and do stuff that's not in the book , people tell me i'm pretty throrough, I think I'm being windy LOL thanks for the complement
Great intro...
Awesome video series on the Cummins...
Excellent recap of the pump issue right here in this video...
Thank you sir
Great job on the operation of the N14 oil pump.
what do you think about oil temps John?
Oil samples are a great tool. It's important to establish a pattern. Then when something is abnormal, such as a spike in copper parts per million, it allows you to be proactive and repair before failure. Other things such as soot levels and viscosity will allow you to adjust service intervals to both avoid pushing your oil too far, as well as throwing away good oil and filters. The factory usually comes up with a oil change interval that is conservative enough to keep the customer out of trouble. After a few years of monitoring oil samples for our fleet of garbage wagons, I had similar engines with a wide range of oil change intervals. Like 1500 to 10,000 miles. Many of these engines were 3306 Cat engines, which usually went around 30,000 hours before overhaul. I still have some bearings, top of rod bearings and bottoms of mains which measure less than .001" wear after 30,000 hours. As measured by a starrett ball anvil micrometer.
The bottom line is: buy good oil and filters, and keep it clean! If you want the longest life and lowest cost, spend the money for sampling. If you don't know how to interpret the reports, get help from a knowledgeable lab.
My engine rebuilding and shop foreman days are behind me now. But the basics of good fleet management will never change: Attention to detail, pro active maintenance, and cleanliness will always be important. It's your money, how much do you want to keep in your pocket?
Jeff, thanks for this series. I enjoyed it immensley . Keep 'em coming!
Thank you for the comment, I agree with what you have said 100%
Drove past your shop today when I was delivering culvert out in Blackfoot also seen you driving back pulling the trailer
You waved didn't you?
Dang you did your homework. 240*F oil starts to oxidizes wow 😳 I didn’t know that.
Great video Jeff.
Bluing salts oxidizes around 295 , above 305 you've cooked and ruined the salts.🤔
@@michaelmcclure8673 wow 😳 Not to change the subject but I just heard they have gluten free lap dances in Seattle.
Regards. I have worked at hydraulic gear pump factory. very similar construction of the pumps. As we all know, hydraulic pumps run at much higher pressure then engine oil pumps.... My experience on side to side gear clearance in oil pump is crucial for output pressure ! In order to achieve such high oil pressure, between gears and pump housing, "pressure plates" were machined and installed in order to achieve minimum clearance .... I strongly agree with everything you said in this presentation. Good job! Thank you for sharing your experience and knowledge. many can learn, and some can relay to it !
Great job Jeff. Been around Cummins all my life and you are spot on.
thanks for the good talk. I agree with you about clearance. the standard grease clearance for a pin and bushing is .008-.012 which rotates. it not one big thing it's the little thing that gets you. keep up the good work.
Hey J,..fellow bladehand from the uk.love watching your videos, normally stick one on before I hed off to work..I'm in the soil and ground compaction and stability game..so very much understand the pro,s and wo,s of your day...keep on pushing....Benn.
The intro! Very nice Jeff! A++
Great video and explanation on the oil supply system have a great weekend 👍🇺🇸
Great series of videos for the N14. Thanks for the detailed info,
Excellent video sr,. I'm from Costa Rica and i'm rebuilding an N14, The owner told me about the low oil presure. I'm gonna check the oil pump for sure, cause it's brand new. Thank You sr.
Check the relief valve there set to open at 40 psi, the N14 is supposed to run 30/35 psi pressure and it will with .007 pump end play but I that doesn't give you much pump capacity if somewhere a oil leakage problem occurs, all my CAT stuff calls for .002 thousandths clearance in the oil pump. clearances in the engine need to be within spec to obtain good pressure
What an opening!! I died! Thank you for sharing Jeff!!
Loving the Cummins content. I totally agree with you and your common sense approach by comparing the Cummins parts to what it's been known to work on other equipment brands doing the same job(oil pump, et al).
Looking forward to watching you work that cool dump truck.
I think that was a great explanation there, Jeff.
As previously discussed, the removal of the thermostat should keep the oil cooler and make the oil last longer between changes. Cost savings for sure.
The high oil temperature is nothing more but heat transfer and energy transfer. He is energy, they were trying to transfer to the oil before they came out with big cam iv Low flow Cooling Which was a disaster. Thank you for the work you put in, I cannot wait to change my pump and put that plug in.
Excellent series of videos learned a lot.👍👍
You are one heck of a mechanic my friend I would love to come work with you guys and absorb some of that knowledge thanks buddy for everything
Thanks 👍
Great to watch jeff
Awesome introduction. The whole video was solid and well done. Great job. Hard to refute your conclusions.
Much appreciated!
The whole thing that piques my interest and caused me to subscribe here and follow the Paydirt page on Facebook is you share what works. A D9 that is 50 years old, it is still reliable. The grader, it isn’t newest machine out there. Same with he 637s. You have machinery that works for you and your operation. You take care of what you have. You do good work and do not cut corners.
You live in some of the prettiest country around or are close to some of the prettiest country around. I watch, and try to learn a thing or two along the way.
You never disappoint. You are a great teacher. Love the way you explain things. Love to hear you knock "Engineers". Keep em' coming
Thanks, will do!
I COMPLETLY AGREE. COMMON SENSE. ALSO THAT PUMP WAS OVER WORKING THE OIL WITH THE BIG CLEARANCE
All your lessons are outstanding! Totally agree on thermostat on the N-14! Nasty looking when changing and ccoler sludge a huge problem! Thanks!
Bitchin intro my man. Love it!
Excellent video Jeff, it's obvious you are a highly trained engineer and the bonus is your very good at explaining things. My old D9G has questionable oil pressure after it warms up, it's in semi retirement now but it will have to be addressed before it goes back to work some day.
Mine has issues also, but it's a little harder to pull in the shop and drop the pan LOL
D9Gs all have low oil pressure when they're warm. My dad was apprenticing as a mechanic when they were new. At brand new, with warm oil at an idle, the oil pressure was in the white. We had 6 D-9s and every one of them the oil pressure went in the white at idle.
@@tyfrank3427get a different gauge avoid gray hair
Nice video, I'm never dissapointed when I watch. Everyone likes a happy ending.
You want happy ending? Joe? 5 dollar
Thats funny mr.anderson
Great information!! Thanks for the video
Only way to really tell whats better is the fuel savings vs oil change savings. If the oil pump trickery saves you 0.1 mpg from 4.9 to 5mpg that's 4k gallons at 1 million miles and at Idaho diesel price over 3.38 per gallon that puts you at $13,520 in savings on fuel. idk whats the better option. To me it seems like a wash on which would save you more. Id just go with what ever saves you more time and hassle.
What size is the plug? The video skips after you mentioned metric size
Fantastic video Jeff.... Happy Easter to you and yours
Thanks 👍
Fascinating and really excellent detective work. Count me impressed.
Sir i just ask about low oil pressure problem n-14 when engine temp. @ reach to 170f oil pressure goes down to 10psi or lower we already replace oil pump, piston cooling nozzle & replace main bearing please help if you already encounter this problem thank you.
Excellent Postmortem . This is the exact type of knowledge and wisdom that needs to go forward into the future. You should make a DVD set of these kinds of vidyas. Many valuable insights in this mini series. Especially on how degraded our supply china... er... chain... has become. We need to keep rebuilding the old iron, long after the electronic junk goes tits up, the old gear will still be running and carrying civilization.
Thanks
Awesome video with detailed and informative information.
Glad you enjoyed it!
Later model n14's use straight cut gears. I'm pretty sure cummins likes the slightly higher oil temp to burn off moisture and hotter oil filters better. I'd rather they ran higher idle psi but they'll last a long time if some other cheap part doesn't fail first. A N14 celect + is my favorite on road engine for 80k or less, simple reliable engines.
With good care they go the distance
I stay around the 120 thousand pounds mark with my 525 n14 and have no complaints been doing that for years!
Sounds like a machining job for Abom79. That would be a great You Tuber collaboration that will boost RUclips suggested videos on both channels.
i watch ABOM79... that is actually a NOPE for him to do this. i have seen him do other automotive and motorcycle stuff.. NOPE.. need a shaft done.. yep.. need a cylinder rerodded.. yep. sorry adam. jeff mentioned the shop he sent his pump to on a previous video.
@@waynep343 ABOM79 has said he doesn't usually do automotive.
I probably would have just heated the spring on the thermostat with a cutting torch and tried to get it to open about 200deg and left it in but I am a wild man like that. :-)
Great Video and explanation bro. Safe travels
Just to add to the point that engineers do not always know or understand their products problems, we operated a couple of Komatsu WA-1200 FEL's with Cummins QSK60's in them. The longest we ever got the engine to last was roughly 6,000 hours with most failing in the 3,000 to 4,000 hour range. At the time it was a $350,000 reman engine. Since those were warranty issues and we had so many problems both Komatsu and Cummins were sending tech people to the jobsite. Will never forget that the Cummins "expert" put a meter probe on a running fan belt and declared that the engine was not grounded properly and was causing electrolosis and causing the main and rod bearings to fail so in essence it was not their problem that it failed and no warranty would be given. The dealer mechanic unbeknownst to the Cummins "expert" tech guy went to his mechanic truck and performed the same test and came back and informed the "expert" that he figured that he would have to replace his mechanics truck engine as he got the exact same reading on his truck. That shut the "expert" up. I can't help but wonder now after all these years if some of those problems that we had were related to some of these design flaws. This was very interesting and a great deep dive into this and I thoroughly enjoyed watching these. BTW the end loader productivity was awesome and it was an excellent machine but we just couldn't live with the low engine life and eventually replaced the machines.
Thanks for that, Love these kind of comments
Great intro and the rest of the video that followed.
Джефф подскажите пожалуйста есть ли в системе смазки клапан на ствол охлаждения форсунок гильз цилиндров
I just bought a truck for the N14 it had. Low oil pressure.. I need a good core for my Pete. They rolled bearings in it.. and didn't fix it so parked it. Figured it was pump issue or piston squirter issue. I have several to build.. not often I find good info on solid changes I'll be making
Took advice and replaced oil pump and piston cooler nozzles. Increased oil pressure by 15 PSI
Crap wish I could find a mechanic like you to fix the Cummins in my old Dodge
Hello. Im getting 40 psi on cold start. After the truck is fully hot it’s getting 15-20 psi on idle and 30-33 at 1500 rpm. However when pulling hills in the summer it drops to about 26-28. I know that’s not within spec . I had it in framed and it the oil pressure didn’t change . What do you think I should do .
An inframe is just pistons, sleeves and crank bearings. did they measure the rod journals and plasti gauge the mains to see if they were in spec? also the cam bearings could be worn, you can change the oil cooler thermostat to a 4925 2631 which is a 215 degree and replace the 240 degree one that's probably in it, if you really want higher oil pressure you can buy a oil pump for a big cam 4 which should have the closer tolerance's N14's have 5 to 7 thousandths gear clearance where as the older big cams had 2 thousandths, makes a world of difference in the pumps ability to make pressure. if that doesn't work your cam bearings are probably worn, oh and check the accessory drive bushing by removing the belts and trying to move the pulley side to side
@@Jpaydirt hey I do have a rattle sound coming from the accessory drive bushing . It’s been like that for years . Do you think that would cause low oil pressure ? Also I’m not sure if the mechanic checked all those things . He was an older mechanic with 40 years of experience he was very grouchy and when I asked about anything he would get frustrated and would tell me “let me worry about fixing your engine” I didn’t want to upset him and let him do his thing . I did change heads injectors turbo and air compressor as extras .
@@duvasio4204 there's a Cummins document that can help to determine where the pressure is being disapated, by putting pressure gauges at the various oil gallery locations and seeing where the pressures are at , at those locations can help to determine where the leakage is happening, but yes a loose accessory drive bushing will create a pressure loss due to the fact oil is escaping easily because of the excessive clearance between the bushing and the pulley shaft, the same thing happens when crankshaft clearances are excessive but are multiplied because of the number of points that oil is escaping. New bearings can help but if the crankshaft journal is worn beyond specifications then pressure will still be poor, accessory drive bushing wear is pretty common on high hour n14's and if not addressed will ruin the front cover and cause serious damage the gears, I still don't have the pressures that I wanted in mine and when I checked the accessory drive I was shocked at how much wear it has. So I will have to address it soon, you can tell how bad it is if there's a loud clanking sound coming from the front at idle, mine is not at that point yet but I still want to fix it, I may also opt to change cam bearings during the repair also as this truck was not maintained properly as evidenced by the condition of the crankshaft bearings when I replaced them, mechanics don't like to be questioned as they think they know everything and that's not true, I learn all the time and am not afraid to say the words "I don't know" and if I don't know I'll find the answers, I love sharing my knowledge because we get more done when we work together 😉
Thanks for that class
Hi J in your opinion, do you think 0.002” is a minimum for the BC400 pump. Or do you think anywhere from zero to 0.004” is good, closer to zero the better. ?
zero would be bad as you need clearance so oil can be present, the book says .002 to .004
so .002 is minimum and .004 is maximum
Good analysis Jeff. Surely a bit of truth in high temp for fuel economy. I’d still recommend a thermostat though, as overcooling oil can lead to issues as well. I suggest calling up a company like Caltherm ( they probably make this part) and ask about a lower temp version. It’s likely just the wax recipe in the power pill. If they don’t have one, you can design one yourself and sell them with your other merch😀
Kool intro, neat info on the oil pump and cooler.😎😎
Well done, Jay. It sounds like it will work.
Professor Anderson thank you for the class on oil pressure problems. Great intro. Have a Happy Easter
Same to you
Only ONE dislike (and that was the Cummins engineer...lmao) Good info....My 'shade tree' mind always balked at that 40psi theory when it was first introduced....I chalked it up to a sales pitch for J.B. Hunt
Man Jpaydirt, from what i can gather, ‘t would be hard to disagree with you!
Great work and sharing. 👊
Excellent class professor Jeff
a damned good machine shop tip..you gotta wear many hats.!
Thanks great info
This vid should get at least a million views........
I'll be shocked if it makes 15K
@@Jpaydirt There is a lot of info here and many$$ worth the advice.
Love the introduction very very good lol thank you.
Really nice video, what kinda oil you using if I send you palm can you do what are you just did a new video
Great video thanks
Great vid . We had a JD 6950 forge harvester for silage years ago, I think it was a 2000 year model, with an N-14, the machine it's self lacked, but I will say that engine always ran great with plenty of power. Our Claas harvester is a better machine but the v-8 mercedes doesn't have the power... maybe we need to retrofit with a Cat best of both worlds lol
What er you got on the table there.
Good video thank you
Well put together video and if it works for you it works for me.
Did the freeze plug work for oil temp. Wanting to try that on mine?
I'd go with the 215⁰ stat 4952631 as it won't get hot enough in the winter
Great intro....n I watched the whole thing
Love your videos! Uhh is replacing the 255° thermostat with a lower temperature be a option?
Yes, and that's what I would do, 4952631 is the 215⁰ stat
I looked up that number and got two different options. 4952631 for $139.45 and DS-4952631 $40.00. Now, the number you provided it is said to be for ISX/QSX, while the DS number it is shown to be for the N14, N14 celect, etc. Any thoughts?
@@RafaelPolo-q6c I got the number I gave you from a facebook group called Cummins N14 Tech Support
Cummins, like all the manufacturers, is in the business of making stuff, not making stuff that lasts...always remember that...
@0:00 through 0:57
I love the introduction!
Nailed the CSI trademark "chung ching".
Great info!
Next up is the Turbo boost Mod!
More good work Jeff thank you
Hello how are you I have been watching your Cummins n14 videos, I have a Cummins n14 celect plus and 2 months ago I built it all new from the signal and everything else and I have already changed 4 oil pumps and it continues with low oil pressure like 15 psi, you think it's the oil thermostat. Many thanks
15 psi at idle? that's spec for a N14 the only way to increase the pressure is take the excessive endplay out of the pump and get it down to .002
Nice work!
Your the cummins expert☻
@@Jpaydirt that’s Cummings expert!
Where’s your shop?
Jeff wins again! Now put that Pete to work! lol, Happy Easter
Every vehicle designer whether it be body or mechanical should have to spend a year working in a service shop someplace.
They sure would design things differently after working on it wouldn’t they.
Yes.
But also, many of the poor engineering designs don't come about from a single design engineer but rather from other problems; project engineers fighting petty turf battles, poor scheduling and pressure to release new designs, constant cost reduction work, fixes and redesigns that come after tooling has been made which boxes you into a corner and so on ...
So it's easy to see something you could do better by yourself, but imagine working in a team of 100 designers tripping over eachother and not always being able to do what you think is best.
@@a222parker Now there is the voice of experience, and the battle scars to prove it !
Yes :) spent many years designing heavy equipment. But I work in a shop before that and it is invaluable experience for anyone who wants to get into designing.
My experience with Cummins engines was not good. I now use Man or Mercedes diesel engines. Can't tell you how much I miss the old Caterpillar on-highway engines.
Really good video!
Thermostat bypass worked great! Thanks. I installed a cat 1R-0749 fuel filter but I left the oring off because it didn't look like it would fit. Now in the morning it takes a long time to crank. Should I put a regular oring on there that fits? Not sure why...
Oring?
@@Jpaydirt the seal that goes up on the threads before you put the filter on. Not sure what it's called. The fs1000 comes with the seal, but the cat filters I got didn't have one.
@@Alex-nx3so well sometimes we have a hard start but then it goes away, jake changed the filter today because it wouldn't make any boost and it's been fine lately, we can't use the 749 as it's to long so we have to use the smaller 750, maybe try the FS and see if the problem goes away. the cat filter claims a 2 micron rating, I wonder what the FS is rated for, we have to change the filter quit often so maybe it catches more crap
Thinking about pump clearance - You complained in your rebuild video that the Chinese pump had too much.
But it was bang on the Cummins spec - so not a manufacturing issue more the spec they were working to,
Your right, but it's not even up to industy standards for a oil pump. cummins changed the specs......why
@@Jpaydirt
To support their Reman division? 😀😀
You da man Jeff makes a lot of sense.
Love your video Sir!
Jeff I’m sure you already stated it but can I ask again what oil will you run in this Cummins?
I never heard him say in this video but in another video I believe he said straight 30 wt
It's got delo 400 30 wt in it right now
@@Jpaydirt. Thank you and I apologize for not paying attention
@@grahamgeiger3206. Thank you
@@Fabes002. I watch all videos reading the captions. I’m hearing impaired and also English is not my first language. I apologize.
I want to tell you that it was a great intro whooooo
When I was at the State of California we ran re refined oil but changed at 6K with filters. We never had pressure issues and for the size of our fleet very few major engine issues. Well, that’s if you didn’t count the 6.2’s and 6.5’s. I have said and will continue to say I would use the 6.2 for a boat anchor but I bet it would fail at that too.
It would probably float LOL
Oil changes every 10k miles seems bananas for a semi truck engine. I've never heard that before. Is this because of the age of the N-14?
It's a dirty mechanical Cummins