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I think most arrows and tic marks are indicative to front of engine. From what goofyness has been found by you at this point I would personally tear it down and check/verify everything. You are smart to investigate, keep up the good work and keep us updated!
Unfortunately I think this is where I will end up and that is not what I wanted to be doing right now. I really am not in a place to pull this engine, time and cost. Hopefully this bore scope will help me to know if the cam bearing is the culprit.
I am not sure if this observation will help, but I have noticed that, while spinning the oil pump, and at the same time gradually rotating the crank I find a spot where I can see oil build up at the back of the camshaft. I haven't been able to quite understand why at that point in the crank & cam rotation I get oil to well up there. Any ideas on that?
If the engine has a crossed drill cam shaft that is typical. I can't imagine drilling the cam bearing, especially if the cam is installed.
I picked up an inexpensive bore scope and ran it down each oiling hole in the block. The images are not great, but I can tell that the cam bearing has spun. Both holes are about 70% blocked. So my next step was to crank on the oil pump and see how much if any oil gets past, which led to another interesting discovery. I am seeing oil in the passages with the passenger side filling all the way up to the deck of the block, but it took nearly 2 minutes!! The drivers side only dulled up about halfway. It is clear that there is very little pressure in this part of the oil system. So my questions now are:
- Is that oil gauge accurate?
- is there something wrong with the oil pump bypass which is bleeding pressure too soon.
- Could there be restriction somewhere else in the system before the oiling port at that part of the cam
- Am I using too small of a drill to prime the system?
(FYI it is a cordless 3/8 Dewalt and priming it is chewing through my battery)
* I have previously dropped the oil pan and I am confident that there is no real possibility that the pickup is clogged.
Any thoughts? Thank you in advance. Drivers side, photo orientation is top of the photo is towards the top of the engine. Passenger side. Photo orientation is, top of the photo is towards the top of the engine.
That was item 4 on my list in post #7. So the question remains how you will approach this issue. Can you see good enough with the scope to see scratching where the bearing spun in the block? Or perhaps it was installed wrong at installation?
One problem is if it did spin rather than sloppy install then it could continue moving even after you drill it out for flow.
It looks like your investigation is finding lots of good information.
Bummer man, best wishes and let us know what you do!
With a crossed drilled cam you will get more oil on one side then the other until you rotate the engine so the oil hole in the cam lines up with the oil hole in the bearing. If the cam bearing has actually turned and thats doubtful in my opinion, but then the oil hole in the bearing that supplies oil from the main oil gallery will also be misaligned. The bearing has 3 holes, one supplies oil to the bearing and 2 to feed the rockers.
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, especially if the cam is installed.
