Mechanics

TIMING BELT FAILURE

1993 Suzuki Sidekick

Engine Mechanical problem
1993 Suzuki Sidekick 4 cyl Two Wheel Drive Manual 99000 miles

I had a mechanic replace my timing belt and tensioner just for a routine 60-90,000 maintenance tune-up. While driving about a week later my car shut down and engine failed due to the timing belt falling out of the route. I had the belt replaced and thought that all was checked and fixed, however just recently the car did the same thing and shut down in the middle of the highway. I had a new mechanic inspect the problem and this time the timing belt was snapped in half. The time before that it had been pushing foward until it melted a hole in the cover. Now it snapped in half. He aligned the tensioner, correlated the crank and cam, tightened the belt properly and made sure everything was working properly to his knowledge and I watched him do the whole thing. What could be causing the belt to spring out/fall off of the mechanism?
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Motorman900
July 9, 2009.




Hi
Just speculation but think first belt tension was too little allowing belt to walk offf cam gear. Second belt was over adjusted and snaped. This time could be right. Was tensioner pully replaced and spring? If no spring it maybe weakened and can't apply proper tension.
Thanks for donate

Docfixit
Jul 10, 2009.
My mechanic checked the spring, plate, and tensioner and there was nothing to his knowledge that were wrong with them. He said that it could be the crank timing sprocket - it may be on an angle caused by a replacement error by a prior mechanic. I'm planning on buying a new sprocket as it is not expensive at all. Is there anything else you can think of that could be causing it to ride off?

Tiny
Motorman900
Jul 14, 2009.
Check for any movement in tensioner pully. Any side to side movement even small is not servicable.

Docfixit
Jul 14, 2009.
My neighbor (who's knowledgable about mechanics) also told me that the Cam gear could be worn down and at an angle as well causing the belt to slip or ride off the gears.

Tiny
Motorman900
Jul 16, 2009.
Yes that could be place new belt on gear should be a tight fit.

Docfixit
Jul 16, 2009.
Idler wheel bearing inside seized.

Thee top or bottom cogs are worn, and no longer square.
Start motor with cover off. And see if it runs true,
if not buy new cogs.
Luckly suzuki sells them for $20 each, very cheap.

Also there is an new style and old style cog.
One has square teeth and other rounded.
Buy a gates belt for your exact year. It will fit.

This a real high mileage car, over 150k?
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Tiny
Kick-fix
Sep 2, 2009.

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