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Old 11-15-2015, 02:16 PM
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Timing belt question

Hello guys and gals. I'm currently in the starting process of doing the timing belt/water pump on my 2005 tj 2.4l. My question is do I need to change the belt tensioner as well. There is only 113,000km on the jeep. So I'm wondering how long the tensioner is good for?

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Old 11-15-2015, 02:32 PM   #2
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I would

Tensioner is no extra work beyond belt

Pump is extra work as required removing cam sprockets and rear plate

Do yourself a favor mark old belt with sharpie on all three sprocket then transfer to new belt so all spans correct as typically one ends off one tooth before you tension

Also be aware if meta stable cams spin without belt valves can collide and bend

But be glad you aren't working on a transverse 2.4 like I did on a Turbo PT cruiser

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Old 11-15-2015, 02:37 PM
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Quote:
Originally Posted by Digger84 View Post
I would

Tensioner is no extra work beyond belt

Pump is extra work as required removing cam sprockets and rear plate

Do yourself a favor mark old belt with sharpie on all three sprocket then transfer to new belt so all spans correct as typically one ends off one tooth before you tension

Also be aware if meta stable cams spin without belt valves can collide and bend

But be glad you aren't working on a transverse 2.4 like I did on a Turbo PT cruiser
Thanks for the advice!

The only reason I was going to do the pump is because it was already opened up. If I don't to the pump and just do the belt, do I still need to replace the tensioner?

How do I avoid the cams spinning?
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Old 11-15-2015, 03:36 PM   #4
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Do you mean serpentine belt or timing belt/chain? If serp belt and water pump go ahead and replace tensioner most f the work is done to that point.
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Old 11-15-2015, 03:43 PM
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Timing belt. 2.4 runs a belt not a chain
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Old 11-15-2015, 05:10 PM   #6
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I would do the pump as if it fails you gotta replace the timing belt again

At TDC number one compression The cams are meta stable like a marble in a little depression on Top of a hill. They won't move unless twisted a little but if twisted a little they snap around a 1/4 turn or so so just don't move them around

To hold cam while removing sprocket nut a racket strap thru hole in sprocket works well

You also need to buy or barrow the puller for the balancer
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Old 11-15-2015, 05:57 PM
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I would do the pump as if it fails you gotta replace the timing belt again

At TDC number one compression The cams are meta stable like a marble in a little depression on Top of a hill. They won't move unless twisted a little but if twisted a little they snap around a 1/4 turn or so so just don't move them around

To hold cam while removing sprocket nut a racket strap thru hole in sprocket works well

You also need to buy or barrow the puller for the balancer

Thanks for the help digger. I bought a puller for the balancer. I may message you if I run into any problems I can't figure out

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