How Many miles before change Timing Chain?

[mlunsford]

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

Thanks!!

 

[exbass94]

You never have to replace it. Keep it in there till the engine dies.

 

[mlunsford]

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 !

 

[AllanD]

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

 

[Big Jim M]

My 08 Chevy came with a paper that sez the chain has been tested to 200K and is expected to NEVER need changing.. WOW!
Big JIm

 

[shadetree]

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

 

[mlunsford]

Thanks Allan

Thanks for info Allan.