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Old 05-01-2013, 10:29 AM
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joniron1 joniron1 is offline
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Boat: 90 prostar 190
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replacement harmonic balancer

I replaced the engine last summer with a rebuilt 351W and GT40 P heads in my 89 prostar 190 . During the install i put a strap wrench on the harmonic balancer to turn the motor over and I am pretty sure i tweaked the harmonic balancer ( the outer ring flutters while engine is running ). My question is can I match it up to one at autozone ,summit or ebay etc. for about $65 or do I really have to pay $275 from a MC dealer?
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Old 05-01-2013, 12:04 PM
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Kyle Kyle is offline
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You will need a harmonic balancer puller, but I would remove the old one. It is possible you weakened the rubber in it. You should have used the crank bolt to turn the engine over.

Take old one to parts store. Compare the two. If they are the same and they should be, then but the cheaper balancer.

I would remove it and inspect it though. They should not wobble when the engine is running.
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Old 05-01-2013, 03:41 PM
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Rossterman Rossterman is offline
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Quote:
Originally Posted by Kyle View Post
You will need a harmonic balancer puller, but I would remove the old one. It is possible you weakened the rubber in it. You should have used the crank bolt to turn the engine over.

Take old one to parts store. Compare the two. If they are the same and they should be, then but the cheaper balancer.

I would remove it and inspect it though. They should not wobble when the engine is running.
Yup,
Never seen a "marine" version of the balancer. Only issue you might have is that they sometimes drill the balancer to balance the engine. May want to see if has balance holes drilled on the backside and compare with the new one to see if they are close to the same.
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Old 05-01-2013, 05:20 PM
TRBenj TRBenj is offline
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The purpose of the balancer is in fact to balance the engine. That *should* be a 28oz balancer, and an automotive version will work.
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  #5  
Old 05-01-2013, 06:34 PM
46Chief 46Chief is offline
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The purpose of the harmonic balancer is to dampen the twisting forces of crankshaft. Do what Kyle suggested go to an auto parts store and source one there, or order one from summit racing. I would replace it asap, if you did damage it, your bearings will fail prematurely.
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