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Jimny crankshaft pulley repair?

  • Orangeherald
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24 Aug 2012 20:44 #46714 by Orangeherald
Jimny crankshaft pulley repair? was created by Orangeherald
I am sure its a familiar fault, the rubber between inner and outer parts of the crankshaft pulley that drives the accessory belts gives up and the pulley falls apart. New one costs about £150 if you can get one. Mine is going and I intend to try fixing it. I reckon with some small plates and a bit of care I can weld the two halves together, and keep the shape and balance right. I will lose the cushioning effect of the rubber, along with its tendency to fall apart. Anyone else tried this? I will of course report results!

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  • markyp2000
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24 Aug 2012 22:01 #46721 by markyp2000
Replied by markyp2000 on topic Jimny crankshaft pulley repair?
its a damper pully for a reason it take some stress of the cambelt/timing chain and easies jults from the pas pump and air con and it is balanced as you say and it will shake its self apart

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24 Aug 2012 23:07 #46728 by Orangeherald
Replied by Orangeherald on topic Jimny crankshaft pulley repair?
I agree they must have done it for a reason, but some makers love those dual mass flywheel type of clutch setups. They cause much pain and expense that I have seen! It is also a common fix to replace those with a solid type. I wonder how important the cushion effect is, and if the self destructing qualities of the Jimny pulley are caused by poor materials or stress from all the shear forces. If the latter then they may do some good. My guess is that the very tight setting of most drive belts simply causes them to self destruct. So, why not a solid pulley and slightly less tight belts? I dont mean loose, just properly adjusted rather than too tight!

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  • markyp2000
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25 Aug 2012 11:54 #46739 by markyp2000
Replied by markyp2000 on topic Jimny crankshaft pulley repair?
again duel mass flywheels take up drive so it is dampened along with the damper pully to take stress off the cam belt and make things run smother and less vibration wour best bet is to take the pully off take it to and engineering company and get one made out off bulet alloy it will be one bit lighter and shouldnt fail and allmost balanced right

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25 Aug 2012 13:38 #46755 by Obarno
I think the pulley on a Samurai is a solid pulley, albeit the outer ring unbolts. As its essentially an earlier version of the G13B engine I wonder if one of them would fit? Or is it only really the M13 engine that suffers with this problem?

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25 Aug 2012 17:19 #46769 by facade
The pulley is a torsional damper. Its job is to stop the crankshaft breaking.

If you never run at the speed that causes resonance in the crank, you won't need it. Trouble is, we don't know what speed that is :(

en.wikipedia.org/wiki/Torsional_damper

(If you believe the wiki ;) )

If it suddenly breaks, go back to the last thing that you did before it broke and start looking there :)

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