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  #1  
Old 10-09-2010, 11:00 PM
art47 art47 is offline
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Default timing chain longevity

I believe the '89 2.9 ranger engine has a timing chain.
The truck I recently acquired has 133,000 miles. Should I be concerned about the chain? What historically is the life expectancy of these systems?

I realise that this is a very subjective question.
If anyone knows of a failure, what was the mileage or truck age?
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1989 XLT 4x4
5 speed Mitsubishi
2.9L
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Old 10-11-2010, 07:35 AM
Psychopete Psychopete is offline
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Default Re: timing chain longevity

Yes, it is a timing chain motor.

You can measure the slack in degrees and determine if it's out of spec.

My Tempo 2.3L HSC (inblock cam) with 180K has a similar chain with an oil pressure driven tensioner like a 2.9L and it was severely worn. It will be interesting to see because the car ran like crap/popped before I started, but was leaking oil really bad from the rear main. But also cleaned the TB, fixed a handful of vacuum leaks, ETC, o2, changed the timing chain, plus a few other things. Everything else looked good, fuel pressure, good compression, and all tuned up. I pretty much have been working on a poormans overhaul on it and I got a lot done this weekend, and should be starting it up within the next couple of days.

If you decide to replace, be sure to also replace the tensioners.

It's kind of a big job, the harmonic balancer is almost always a bear to remove. But the real pain in the butt is that there are two studs at the bottom of the timing cover that go through the oil pan that would sure make it a PITA to change in the truck if needed. But on the other hand, you would be looking at the cost of replacing what was removed to actually get to the chain. Plus resealing the timing cover to the oil pan I would worry about. I would do it if I planned to remove the oil pan. But you can measure the amount of slack in degrees to make sure that it's within spec, but some would just recommend changing it while the motor is out.
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Old 10-11-2010, 07:58 AM
Gonzos xlt Gonzos xlt is offline
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Default Re: timing chain longevity

Timing chains have been known to last well over 300,000 miles on properly maintained engines. They will tend to stretch before they break. When they stretch, you will notice your engine running like crap because the timming will be off. If your engine is a non-interference engine and it breaks, the worse will be that you have to have your truck towed to a mechanic.
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