Loc: Columbia, SC
Re: Bob's 3.0L Engine
08/28/06 10:16 PM
First glance at the bottom end suggests good news - it hasn't been long since this one was overhauled - guess the gasket blew shortly after the rebuild.
Rod bearings look new:
Crankshaft journals are nearly perfect:
Crankshaft bearings are like new - here you can see why the bottom end of a 3.0L is so stout... the main bearing saddle provides a great deal of stability:
The cylinder bores look fine, but I'll have to put a dial readout gauge on them to see if they need boring - probably will. Note the lack of honing marks - probably wasn't bored/honed on the rebuild... pistons appear to be original 3.587":
When I was a kid, I would have reinstalled the crankshaft as is and re-used the same bearings on a bottom end that looks this good, but I'll take it to the machine shop and make sure all the clearances are correct - don't wanna be doing any warranty work for forum members.
The block's gonna need at least honing and if that's all, maybe the original pistons can be re-used (if the ring grooves are still ok) - BUT - I suspect it'll have to be bored .010-.020" and new pistons installed.
It looks like the last rebuild was a freshen-up job with new bearings and gaskets - also the rings were likely replaced, since there was no carbon ridge at the cylinder tops. Anyway, I've sure seen a lot worse to work with than this.
'89 G-Raider Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum
Edited by FrankR (08/28/06 10:21 PM)