Jump to content

Recommended Posts

2002 CX613 Low oil pressure. Mechanic can't seem to figure it out, Any ideas?

This is a never ending story. . .

Purchased truck in Memphis while driving it home about 300 miles I discovered oil in water. At that time oil pressure 60 psi.

Brought to mechanic, did In Frame. brought it home thought we was good to go. Started it up went down the road a few miles and oil pressure dropped. Cold start 20 psi, running drops to 18. Mechanic has put new rods and mains, head gasket, new sleeves, new oil pump, new accessory shaft, new bypass oil pressure regulator , rings, checked Jake brakes, checked rocker arms. Now mechanic says its the cam bearings. Cold start 20 psi 15 min later 18 psi engine shuts down. 8 weeks later no solution. Picked truck up and now she sits. Anyone had this problem?

Link to comment
Share on other sites

Did the correct size bearings get installed , had a truck few years back that someone else had rebuilt the engine turned the crankshaft down and put stock bearings in = low oil psi . I had to remove bearings and install correct oversize bearings and all was good. Need to make sure oil is not being duluited with fuel also this is common low oil psi issue.

  • Like 1
Link to comment
Share on other sites

He did say he has oil in the coolant?

if you read it that was the reason for the in frame now that that is done he has no oil pressure and it shuts down, I would trouble shoot with looking at the receipts for the parts and verify they were correct, then mechanical oil gage, then pull the oil pan check oil pump by pass then keep working my way until the problem is found. The mechanic/shop that worked on it should be coming good for the work otherwise I wouldn't pay or try and get my money back if you paid by credit card contact them and dispute the charges

  • Like 2

Robert

"I reject your reality and substitute my own."

 

Link to comment
Share on other sites

No fuel in oil. Mechanical and manual oil gauge used. Changed oil sensors, oil pump, new oil pressure regulator, warning buzzer comes on within 15 minutes of truck running and shuts down. truck doesn't run long enough to check brake. blocked Jake brake, no change in psi. Rocker arm caps aren't leaking, Mechanic called said he felt only thing it could be was cam bearings.

Edited by Sir-Man
Link to comment
Share on other sites

The early etech had freeze plugs in the ends of the rocker arms, seen alot of them pop out but probaly all 4 would have to come out to loose that much oil pressure, seen oil pressure drop when wrong centrimax oil filter installed there is a big hole and a small hole one that fits those engine or maybe they left out the centrimax filter, good luck.

  • Like 1
Link to comment
Share on other sites

Have never seen cam bearings on etec cause oil psi so low that it caused low oilpsi and shutdown to come on . See if he still has the old main bearings and check to see if they say deltawall on the back or P1 or P2.

  • Like 1
Link to comment
Share on other sites

If you would've said, low oil pressure and not had any repairs, Rods, mains, and oil pump would have been first choice. You probably should check the rod and main bearings as Staxx suggested and check the oil pump as Mackpro68 suggested. Its hard to condemn new parts but shit happens.

Ive also never seen cam bearings cause low oil pressure and shutdown. Cam bearings could cause low oil pressure to the jakes, but that isnt your problem.

Link to comment
Share on other sites

I checked the oil pump and made sure no debree and gears aren't broken on new pump also blocked off hoses to jake brakes I was wandering how much oil should be getting to the rocker arms and vales it seems like very little to me I also installed relief valve or by pass spring in filter housing is there anything else that could cause low oil pressure after 15 minutes of running seems as soon as oil get warm oil pressure drops

Link to comment
Share on other sites

I just tore it down, have one lower main bearing in hand. Has noticeable groves, and a few burrs, less than 300 miles on these bearings. Top appeared to be fine. I have yet to check other bearings. Did plastic gauge and measured six thousandths. Mechanic does not have old bearings available for comparison.

Link to comment
Share on other sites

Crankshaft main journal to bearing clearance .0022 - .0056 in. Make sure if engine is in chassis to support the crankshaft to measure with plastic gage to get a good reading. Rod journal clearance .0012 - .0054 in. If the crank has been turned down they are usually marked ,stamped at front counter weight somewhere.

  • Like 1
Link to comment
Share on other sites

upper and lower bearings can be different, lower shells typicaly have more surface area than the uppers since thrust force on the crank is down.the milled grove in the upper allows for oil to enter the crank journal and supply oil to the rod bearings. did you plastigauge the rods? it sounds like either wrong bearings got installed or other component is improperly installed. you drove truck to shop with ok oil pressure and cant drive it out with good oil pressure. something is like cam bearings don't fail in the shop when the eng isn't running. unless it spun a cam bearing it start up. This will be real messy but you could pressureize the oil galley with a external oil pump and with the pan off see whats leaking too much oil

Link to comment
Share on other sites

  • 1 month later...

March 27, 2014. Problems and issues resolved. Four months and she's ready. New mechanic investigated for about a week. Oil pump and filter was incorrect. Leaking oil by oil cooler that mounts to block. The Etech and the E7 appear to have same oil pump. However, Etech pickup and discharge are opposite of E7. I needed a 12 tooth but had a 13 tooth that created the low oil pressure. Watched quite a few mechanics scratching their heads. The new mechanic took the challenge and solved her problems. Thanks to all for your advice it sure helped. Now I'm off to hit the road. Richard

  • Like 2
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...