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Hello.....I just bought a 98 silverado that has a clunk sound when revving the engine and after it runs a few minutes it starts smoking. Someone said it has a broken crankshaft.

Looking at the pulleys they dont wiggle. Can I put a wrench on them and turn it and watch the flywheel for lack of movement.

What steps should I go through to diagnose the problem.

Thanks
 

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Hello.....I just bought a 98 silverado that has a clunk sound when revving the engine and after it runs a few minutes it starts smoking. Someone said it has a broken crankshaft.

Looking at the pulleys they dont wiggle. Can I put a wrench on them and turn it and watch the flywheel for lack of movement.

What steps should I go through to diagnose the problem.

Thanks
Please tell us a little more about the 98' (1500,2500,3500) 2 or 4wd and any mods
(y)
 

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Ronald Reagan fan
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Might be just a bad outer crankshaft pulley that’s clanking back and forth.That’s the first thing I’d check before moving onto something else.This pulley is known to make noise when it fails.
 

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You need to go under the truck to see the crank pulley with the skid plate removed (if exist).
 
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