Whaleman

Please keep in mind Diz that the cam bearings have oil under pressure to them. There would be a constant flow of oil out of the bearing. I see no chance that a piece of metal could swim upstream like a salmon to get inside the cam bearing. I hope your bearings turn out fine. Good Luck! Dan

rklessdriver

New cam and new lifters minimum.

All that metal went somewhere though.... your choice whether to see what else it may have hurt and how bad. I'll tell you though, that's alot of metal and I wouldn't just slap it back together.

As for why it failed... like I said, SADI cam cores are poor choice outright for roller cams. They will work on mild lobes but as you get more aggressive lobe profiles and more spring pressure and more RPM, they become a failure waiting to happen. Your cam isn't even really aggressive but thats a typical failure for a SADI cam core.... the hard outer surface layer cracked and eventually it ate itself right down to the unheat treated core material... look at the comparatively little damage to the steel roller wheel.... This is why I won't use one on anything-ever.
Will

BadSS

Maybe this oil flow diagram will help. Oil flows through the filter, but if catches enough trash, it could by pass the filter and send unfiltered oil through the engine. If the cam journals are scorn there's trash embedded in the cam bearings and if trash/metal made it to the cam bearings, chances are it made it to the mains and rod bearings. If it were me, I'd have to drop the pan and see what they looked like.

Whaleman

I don't want anyone to freak when they see that "bypass at 10 psi". The Mobile 1 filter I use bypasses at 22 psi. That is a pressure DIFFERENCE through the filter media. Backpressure builds as the filter clogs up. It has NOTHING to do with the actual oil pressure you see on your gauge. Dan

dizwiz24

Found nothing in the pan
taking engine to a shop working on ny other engine to check out cam. And main bearings

Something i found interesting is this time (93k miles) the cylinder walls were mirror smootth.
last tine i had it apart (68k miles), cylinder walls still had cross-hashing

couldnt find metal (from the cam) anywhere

95wht6spd

Cut open the filter?

dizwiz24

yeah, im sure its there its being going to as it should be

Whaleman

Diz, I know this is a giant stretch but I am going to throw it out anyway. Do you think there is any chance that 5-10 micron maybe 15 micron pieces of steel from the cam that can go through the filter could have led to being used as a "polishing" agent on the cylinder walls? Dan

dizwiz24

thats a good point. If it needs rebuilt i will. Its currently at an engine shop to have them look over and replace cam bearings which they said they can do without a complete teardown

should one expect to still see cross-hashing on cylinder walls at 93k miles ?

Whaleman

I don't know. I do know cross hatching does two things. In the beginning when the cross hatching is sharp it files the rings to fit and "break in" the engine. This is why old British twin motorcycles in the 60's were to be "broke in" with very cheap single grade oil. They needed more "filing" than modern engines. This actually happens pretty fast. After that the sharp points of the cross hatching are gone and the rings "ride" on top of the mountains. The valleys hold oil that keep the rings from wearing any more. Without these valleys the oil scraper is very good at scraping all the oil and allowing the rings to wear faster. Dan