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Crankshaft Pulley Delamination?


 
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The Chimp
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PostPosted: Fri Dec 07, 2018 8:53    Post subject: Crankshaft Pulley Delamination? Reply with quote

Hi,

Having just taken ownership of a 1995 MkII SWB Pajero I've been giving it a good look over, acquainting myself (mainly) with the 4M40 engine. In the process, having spent quite a bit of time browsing the grand pages of this forum, I have read a great deal about crank pulley delamination. I'm interested because I am having difficulty aligning the timing marks (pulley and camshaft) at TDC and wondered if my truck is in danger of delamination! My question is, where does the delamination take place? Is it between the 3 pulleys, so that each pulley is left to rotate independently from the other 2 or does it take place around the centre shaft, so that the pulley group is able to rotate independently around the end of the crankshaft?

Cheers.
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peteinchad
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PostPosted: Fri Dec 07, 2018 12:17    Post subject: Reply with quote

There is an inner part that goes on the crankshaft - then a rubber ring that is bonded onto the inner part - then the outer steel bit with he grooves for the belts is bonded to the rubber.

If it delaminates then the bond between the inner and outer steel parts fails and the outer bit that drives the belts is no longer connected to the steel bit on the crankshaft.

So the timing marks on the outer bit of the pulley no longer give an accurate position for TDC.

Once delaminated you can often move the outer part forwards and backwards with your hand - and the outer part can damage the timing casing - or fly off and damage the radiator etc.
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The Chimp
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PostPosted: Fri Dec 07, 2018 12:28    Post subject: Crankshaft Pulley Delamination? Reply with quote

Thanks peteinchad, that's precisely what I needed to know  Very Happy I think I'll buy a new pulley and prevent rather than cure. Cheers.
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peteinchad
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PostPosted: Fri Dec 07, 2018 12:34    Post subject: Re: Crankshaft Pulley Delamination? Reply with quote

The Chimp wrote:
I think I'll buy a new pulley and prevent rather than cure. Cheers.


It's cheaper in the long run.
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