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Old 08-24-2008, 02:12 PM   #1
mlunsford
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Smile How Many miles before change Timing Chain?

Can someone tell me how many miles I should go be before changing the timing chain on the 4.0L OHV engine ?

Thanks!!
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Old 08-24-2008, 02:19 PM   #2
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You never have to replace it. Keep it in there till the engine dies.
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Old 08-24-2008, 02:33 PM   #3
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Default Thanks,

I have my heads off (cracked) changing my water pump. only 104K miles. Do not really want to change the timing chain.

Thanks for info !
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Old 08-24-2008, 06:07 PM   #4
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I've seen the factory timing chain go 250K plus in 2.9 engines

The very similar timing chain setup in the 4.0 has a better tensioner design and the chain is under less stress, because to spin the cam in a 4.0 takes only 30% as much force as the one in the 2.9.

Sound strange? Two word for you: "Roller Cam"

There is NO reason the timing chain in a 4.0OHV to EVER wear out.

AD
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Old 08-24-2008, 09:01 PM   #5
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My 08 Chevy came with a paper that sez the chain has been tested to 200K and is expected to NEVER need changing.. WOW!
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Old 08-24-2008, 09:16 PM   #6
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The worst case of a timing chain problem I ever say was on a 1977 Chevy V6. The chain had stretched so much that it wore a hole in the upper and lower side of the timing cover. Oil everywhere, but it still ran ok. Owner would just dump in a bunch of oil, and take off. shady
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Old 08-24-2008, 10:51 PM   #7
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Default Thanks Allan

Thanks for info Allan.
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