Main and / or rod bearings failure in 1968 DVC

[cadillacmike68]

Greg, can you even put Roller Lifters on a 472 without altering the block or heads?

I will check with the rebuild shop to ensure that they did run in the engine at 2500 for 25 min when they first re-assembled it.

If they didn't then I need a new cam and lifters? and possibly cam bearings??

["Cadillac Kid" Greg Surfas 15364]

Mike,
Find the noise first. Don't just start throwing parts at an inaccurately diagnosed problem.
Yes the proper roller lifters (as shown) will work in an unaltered block, but you need the correct cam for them to be effective, and for most (less than) 4500 RPM Cadillac motors they are unnecessary.
Greg Surfas

[chrisntam]

My 2002 Avalanche has roller lifters.  Don't all modern engines now use roller lifters?

[cadillacmike68]

Car has been running good since last spring, but I'm hearing a rapping sound again, not sure where from. Not anywhere as loud, but I'll have to have it checked. I ordered one of those oil test kits from Blaskstone.

Anyone who has used these guys before?

Found the cause of the "rapping" sound. Answer is in my latest car follies post:

http://forums.cadillaclasalleclub.org/index.php?topic=156624.msg437548#msg437548

[cadillacmike68]

Here are some crank damage and bearing pics for those who want to see the damage the contaminated oil did to the crankshaft.

The bearing photos shows a good bearing on the left and the spun (or nearly spun) one on the right.

[The Tassie Devil(le)]

G'day Mike,

That sure made a mess of that Crankshaft.

Never seen one before with such a definite division between good and serviceable, and bad and replacement warranted.

Bruce.

[cadillacmike68]

G'day Mike,

That sure made a mess of that Crankshaft.

Never seen one before with such a definite division between good and serviceable, and bad and replacement warranted.

Bruce. >:Dv

Hi Bruce.

That one on the left was a goner as well, but it was 2-3 times as thick as the one on the right. The rebuild got all new crank, rod and cam bearings, 2 rods to replace #s 5 & 6, one piston, a serviceable crank (010 over bearings) from RockAuto - probably THE LAST one they ever sent without requiring you to send in yours first. new valve guide seals (stopped the oil usage!!) Cam was still good, and the cylinders only needed a light honing. even with the bearing damage, the engine insides were very clean.

A lot of other niceties were done as well, like new transmission lines (PITA because they were a 1969 set) and a new trans pan with 10 cooling tubes.