Re: [Chevelle-List] I'm stumped

[Herbert Lumpp]

> I had the motor apart once and replaced the rear main bearing. > All the bearings looked good except for the rear thrust face > of the rear main. The bearing surface itself isn't the problem. > The thrust face is lubricated by what runs out of the main and > oil pressure is no problem. The rear thrust face of the main > bearing just erodes away. End play has gone from 7 thousandths > to 13 thousandths in what amounts to 12 to 15 miles of driving.   > I've decided that since the end play is greater than what I feel > is acceptable I'm going to pull the motor and replace the bearing > and while I'm at it I'm going to check out the rest of the motor > again.     Bill, since you're going to pull the engine and replace the rear main bearing anyway, I read once a long time ago in a magazine no less, that you could drill a small hole through the thrust face of the bearing and the main cap into the oil passage which will provide pressurized oil to the thrust surface of the bearing.  The reason for this mod was for stick shift/high pressure clutch setups.  I know you're running an auto but it could help prolong the life of your thrust surface.  Just a thought...   cYa-   Herb Lumpp 1966 El Camino, LS6, 6 spd, Currie 9" ACES 3509, MCC 528 http://users.adelphia.net/~hlump/