icanfixall
Official GMM hand model
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How In the Heck Would This Happen
- Thread starter icanfixall
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towcat
Full Access Member
iirc Barney sheared a set of crank bolts and DDC might have done the same once too.
Jake_IN
Full Access Member
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icanfixall
Official GMM hand model
Those threaded holes in the crank flange are drilled thru and the broken bolts should be really easy to back out of the flange. Installing a differant crank in an engine is no easy job. You can't just flip the engine over. Remove the crank and install another.... Unless you have 8 arms to move the rods around... I did this once and only once on a 250 inch chevy 6 cylinder... What a puzzle that was getting all the rods positioned correctly so the crank would settle into the mains...
MUDKICKR
Full Access Member
thats why you take the plugs out and push the pistons til they hit head.
anything can be stripped out if installed wrong, maybe they used the "tighten til it breaks and back it off a 1/4 turn method"
Knuckledragger
blowing chunks and grabbing porcelain
Well, if you have all of the pistons pushed to TDC, you really only need four arms. Actually, it isn't very hard to do, but you need to set the crank above the rods for a little while. Once it is in place, you put some stiff, thinwall vinyl tubing looped over the crank from one stud to the other on each rod. Slowly lower the crank down, and the tubing will guide the rods into the correct position (usually, sometimes they need a little help by jiggling them). You can also use straight pieces long enough to lay on the crank rod journals, it will do the same thing, acting as a guide.
If I were in PA, I would take a look at this engine and determine if it really needed a crank, or just a new owner.
If I were in PA, I would take a look at this engine and determine if it really needed a crank, or just a new owner.
GenLightening
Yeah, it's a CHEVY!
Wonder if they are actually stripped or the bolts broke off? If broken, could have used the wrong grade bolts...
tjsea
Full Access Member
Bolts are stipped. Engine was in a truck that the guy was doing something transmission wise and had the flex plate off. When he put the flex plate back on he crossthreaded the bolts and tightened them till they pulled threads. The seller didn't do this it was the previous owner (local truck) who then gave up on fixing it.
Which begs the question: how the heck do you crossthread grade 8 bolts into a hardened crankshaft
Some folks have .... er, special skills
slvrwrx
yeah, son
Which begs the question: how the heck do you crossthread grade 8 bolts into a hardened crankshaft
Some folks have .... er, special skills
Probably used an impact like most do and just pulled the trigger lol
Maverick1701
Full Access Member
If I had the money, I would buy that and pull it apart...just for the learning experience.
Not for 650 bucks....
Maverick1701
Full Access Member
wow! I didnt look at the price
justinray
Contributor
For 650 he can have it, if it was cheaper, I would buy it, drill and tap the holes the smallest next size up and hope for the best while I started it out of the truck.
tjsea
Full Access Member
Which begs the question: how the heck do you crossthread grade 8 bolts into a hardened crankshaft
Some folks have .... er, special skills
Yeah, I agree some people are spedcial.
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