Will I have to replace the entire car engine?

[comingofage03]

My car started to make these funny sounds the day before yesterday... A mechanic told me that it was the crank bearings and that I should replace the whole engine? Is that logical? or could I just replace the crank bearing. Pls inform me of what is the most logical and economical thing to do. Thanks 1983 chevy caprice v8 305

[1986Z28]

if you hurt a main bearing or rod bearing, you would have to erbuild the engine, youd most liekyl; have filiings throughout th motor and the crank is most liekly hurt to, take it to another mechanic before you do anything though

[silicon212]

A spun rod bearing will result in a bad connecting rod or two and also a bad crank journal. A spun main bearing will result in damage to the block which will require an align bore and special spacer bearings. Either way, you'll need a crank. There's also a good chance that with a spun rod, the piston crown will be crushed onto the rings due to cylinder head interference (from grossly increased rod bearing clearance).

[Blue Bowtie]

That's all good, but an '83 305 had 14cc dished pistons and a tapered/relieved area around the upper ring land. There will be plenty of other damage to warrant replacement, however.

[comingofage03]

Hey!!! I Found Out It Was My Crank Pulley Buts Thanks Alot Guys You Were Very Helpful

[silicon212]

Originally Posted by Blue Bowtie

That's all good, but an '83 305 had 14cc dished pistons and a tapered/relieved area around the upper ring land. There will be plenty of other damage to warrant replacement, however.

Such an engine (actually, an '81 LG4) is what I based my post from, via experience. The #1 and #2 pistons slammed into their respective heads and had a nice chamber-shaped imprint on the "flat" area of the piston.

But, I digress.

Comingofage -

As for the pulley, it was likely the harmonic balancer - the rubber "seal" tends to extrude over time, allowing the outer ring to spin freely of the balancer hub. Makes a hell of a racket, glad to see that's your only problem. They're fairly easy to replace.

[easterwabbit]

Originally Posted by Blue Bowtie

That's all good, but an '83 305 had 14cc dished pistons and a tapered/relieved area around the upper ring land. There will be plenty of other damage to warrant replacement, however.

LG4 and a couple others yes- but not all 305 did

such as the L69 and so forth

good luck