I'm looking at getting the engine on the Cabover rebuilt before I put it on the road. I found an old school mechanic who quoted me $4k with a 1 year guarantee. I just need to supply the parts.
I know the crankshaft is something needed, but beyond that, I'm not sure. Would anyone care to enlighten me?
Not a gearhead, learning this as I go along.
Thanks!
Rebuild on 300 Cummins
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by 85COE, Feb 27, 2021.
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What's wrong with the crankshaft? Unless its broken or a bearing has spun it's probably fine.
If its just worn past re-use spec, send it to a machine shop and have it ground undersize and get the appropriate undersize bearings to match.beastr123, Dino soar and tommymonza Thank this. -
I've got a 42 year old CAT and the crank has not had 1 journal ground undersize yet. Just put new bearings in it and the bearing clearance is still within the spec range for new bearing clearance.
Dino soar Thanks this. -
The engine has 809,xxx miles on it. The heads were replaced at some point, but no idea when. A rebuild seems reasonable so that way I can ensure it'll last another 800k miles. The reason for the crankshaft is for safety. Don't need the old one failing with a fresh rebuild
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You're looking way too far into it. I wouldn't waste a cent on a new crankshaft if the old one is not worn or cracked. Huge waste of money IMO.
bzinger, BoxCarKidd, Dino soar and 2 others Thank this. -
While I appreciate the feedback, I was advised to replace the crankshaft during a rebuild by an owner operator since 1975.
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Hell even the factory remanufactured engines from cat Cummins Detroit or whoever don't have new crankshafts in themlittle cat 500, Crude Truckin', bzinger and 4 others Thank this. -
p608, bzinger, Dino soar and 1 other person Thank this.
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That's why cat wants cores back on just about everything -
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