cam bearings
Turbo Mini Forums

pulled with a length of studding.

And on the 7th day........... God created turbochargers!

If pulled in with studding ( = very good ) and the cam still doesn't fit, either your "drifts" (really the puller mandrels) weren't quite the right size, ie a little bit too small, so you put a burr on the "pushing" edge.... easy to get rid of with some careful abrasive .... or the bearings were supplied undersize.

I have had experience of sleeve bearings being supplied to size (so the worst you can have done is raised a burr), or supplied undersize so they do need some work afterwards (ie, a home made ream) to get them right.

Schrödinger's cat - so which one am I ???

Mounted the bearings on my drifts and pulled with a bit of studding.. lol

The bearings did NOT fit on the cam journals even when they werent fitted, my mate bought some 1275 ones also (mines 998turbo) and they were a bigger size, too loose on my cam, and his are too tight too!
So i need to get an old cam and make a cutter thingy, damnit !

I have had new cam bearings put in by a machine shop and the cam is really tight. i can turn it with a ratchet but not with my fingers like i think i should be able to.

I am goingt o get my cam bearing journals polished/cleaned/taken down a smidge.

do you reckon this is ok to do?

strange,

I have heard cam bearings used to need to be reamed to size circa 15+ years ago, but certainly all the ones i have seen have been "pre sized" ie just fit them....

the only 2 problems i have had with fitting cam bearings was a block that had the bearing bores scored up where some one had butchered the bearings out, once i de bured the bore the bearing went in ok, anf the other problem was a burr on the camshaft journel wher some tool droped the cam but fitted it anyway (not me, it was an egine i bought).

rather than get the cam modded i would pull the cam bearings and put another set in, they are only about 15 quid, I get mine from minispares, i would imagine they would be from the same manufacturer in the us, but its worth checking them in the cam before fitting them.

also for the record, my bearing tools are too small and i have had no issues with the bearings compressing too small.

I think Vizard talks of reaming cam bearings to size but i cant find anything about how to do it in his book!

how do you ream the bearings when all three are different sizes? how do you keep them concentric?

My machinist has never heard of this, and he remanufactures OLD engines

Make a reamer from an old cam, it is mentioned on the first page.
I will be needing to do this shortly, it just doesnt sound like fun!