Low Oil pressure after rebuild - NEED Your Wisdom!

Oil cooler? Not a good sign if a reputable shop can't figure this out. There's only so many possibilities

 

Sounds like you have something sucked up in the oil pump and into the oil galleries.
If you are loosing oil pressure past the pump and filter, you have a major blockage problem.
Hate to tell you but your going have to take the block out and get it checked and cleaned out.
Or your going loose you engine and all the parts and hard work you put into the engine.

 

cat kit or aftermarket? cat shop?

 

I had something like this after a S60 rebuilt. A shop rag got left and sucked into the oil supply, everything went to heck in seconds.

 

I feel for ya, I'm the same guy. I use the same independent mechanic I have for the last 10 years. He cuts counterbores for many other shops in a 200 mile radius, and I've watched him work over the years. He is surgeon general serious when doing an inframe or a transmission rebuild, takes it very seriously. His name is on the line. @wore out has used his services I believe.

Thing I like about him is that he will back up his f-ups. If it left his shop and fails, anything from the tow, to repair, replacement, or re do. I'm certainly not his biggest customer, but I've stuck with him because of his integrity. He chose to eat $4k on injectors, because FL supplied the wrong ones, and his mechanic didn't check the numbers before installing, and FL wouldn't honor their mistake after 10 months. Maybe the reason he is down to just himself from a 5 man shop. But he did the right thing by me.

I hope your shop will do the same.

PDI I believe is the name for the aftermarket kit that you and @lester were referencing. McBee is another one that comes to mind.

The camshaft was mentioned. If the lobes were inspected and not scored or damaged, there would be no reason to remove, but camshaft bearings would not be replaced either.

When you said 'cracked liner' - why not just replace that cylinder pack? Was it up for an inframe?

How many miles are on the engine - when was last rebuild?

It'd be great to have 8-10 guys on here looking over the shoulder of your mechanic as he diagnoses and gets to the root of the problem, one of the reasons I like this forum.

@sawmill hasn't weighed in, I think he's had some experience with this engine too.

Anyway - you've mentioned a couple of times that the lack of cashflow is becoming a burden, hate to hear that. 7 weeks - is a long time to be unexpectedly down. Most shops could have this in and out the door within 2 weeks at most, even with parts availability issues.

Good luck - again, just thoughts from another 'external parts changer' like yourself.

 

It’s gonna be a loose or not in place piston cooling nozzle. Anytime you have this kinda thing you gotta go back where you been. Good pressure prior to the filter says pump pickup and relief valve is ok. After the filter loosing it says it’s either filter it’s self or 1 helluva leak internal. Naturally first thing I would do is get the hell outta there before they #### up more #### playing the poke and hope game. Then I’d run it with the covers off. See what happens. Then I’d pull the pan, check piston cooling nozzles and all bearings. Make #### sure I didn’t have a .010 under crank with standard bearings. And I’d want to retorque it all myself. I’ve seen several swear oh my engine never been into when they are begging me to order their kit. Not to find out it’s turned .010 and CAT don’t even offer a #### insert for it.

I know it sounds harsh, I’m not some holier than thou never made a mistake. I have and when I have we went through proper diagnosis to find it and fix it not poke and hope blame parts etc

 

@RustyBolt - there you have it.