timing belt broke.. what are my chances of severe engine damage? - 3000GT/Stealth International Message Center
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Old 04-16-2002, 12:22 AM   #1 (permalink)
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Default timing belt broke.. what are my chances of severe engine damage?

let this be an example to those who elect to prolong the 60k service a few thousand miles..

about a month back i was driving my car and noticed the temp gauge quite a bit higher than normal ... being that i had been having overheating problems prior to this occurrence i pulled over quickly and got out.. to my surprise, i wasnt smelling overheated antifreeze, but instead, burning rubber... i noticed a good amount of smoke coming from the right side of the engine compartment..

being that i was about 2 miles from home, i figured i could possibly limp back home to take a better look.. i restarted the car, made a u turn, and 300 ft later the car died completely.. i ended up pushing the car home...

now, a month later, i was finally able to inspect the damage.. i popped off the timing belt covers and this is what i found:



not pretty.. the gears turn (or at least rock, i didnt want to turn them) and i hope thats a good sign.. i tried turning this "other thing" that didnt turn, and im guessing that this "other thing" is the water pump.. here is my very ill-educated diagnosis..

due to me being a procrastinating dummass, my water pump started to fail, which was causing my overheating problem.. finally, the water pump failed completely, which caused the water pump pulley (do our cars even have a water pump pulley?) to seize completely, which in turn caused friction on the timing belt causing it to burn up..

hopefully someone can either confirm or deny my very non educated guess.. heres a picture of the "other thing" which i suspect to be part of the water pump...



now, ive also read numerous times that a failed timing belt usually results in bent valves and holy pistons... i did not hear any noises that would red flag metal on metal before the car died, but i know that probably doesnt mean much.. is there any way to find out if i did serious damage short of replacing the timing chain?

heres a close up picture of the timing gears (if thats what they're called).. what position should the little yellow cirlces just inside the gearteeth be at? this is where they were after taking off the covers and after some slight fidgeting on my part..



is this bad? since im going to be in there anyway, im going to do the entire 60k service (better late than never)..

ive read the tutorials for doing the 60k so i have a question.. do i really need the timing belt tensioner tool?? i mentioned it to a supposed import mechanic and he had no clue what i was talking about...

i can probably do a search, but while im here, where is the best place to order everything i need for the 60k service? i also need to order the repair manual for my car... any tips?

what a mess, hopefully i didint screw up too much..

thanks for all the advice, it is greatly appreciated...

- eddie -
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Old 04-16-2002, 01:58 AM   #2 (permalink)
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damn thats what I worry about two I have had my tranny, ECU ,thermostat go on me I gotta do my 60K service.
oh BTW that other part is the water pump was that the part that was not working?
It looks like to me that your timing belt didnt snap? there then you are very lucky,
I think you had a faulty water pump that was gradualy wearing away the timing belt.
Was your car overheating? like temp guage at H? when you drove for the second time?
Also you need to replace the tensionser pulleys as well
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Old 04-16-2002, 03:18 AM   #3 (permalink)
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Why does it matter if it didn't snap? It's as thick as a shoe lace now...
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Old 04-16-2002, 08:46 AM   #4 (permalink)
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Eddie---I think your diagnosis is dead on. The water pump pulley should rotate (that IS the water pump pulley). You may have gotten lucky and not bent any valves. I did the first time my belt jumped last week, and now I'm in the same boat you're in and hoping i got lucky again. You need to pull the 3 front spark plugs and look inside the spark plug holes. See if you see anything out of the ordinary. Check the spark plugs for damage. Then go get a compression gause ($20) and check your compresssion. If you have a bent valve it will show up on the test. At the least, You can do a 60K tuneup, and at the worst, you'll need some new valves ($20 each). You WILL need the tensioner tool. See if a mechanic at your local Mitsu dealer will loan you one. You can buy one at 3sxperformance.com if you wish.

Good luck!
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Old 04-16-2002, 11:38 AM   #5 (permalink)
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Unhappy I think it's bad

Sorry Eddie, I think it's a bid difference between jumping a few teeth and having the belt go entirely with the engine running. If it was at idle you may get luck, but I would expect bent valves. I would not expect holes in the pistons unless you were at high revs. Best of luck and I hope I am wrong.
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Old 04-16-2002, 11:50 AM   #6 (permalink)
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How many miles are on your engine now?
I wanna know how long I have until I have to really start to worry
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Old 04-16-2002, 07:31 PM   #7 (permalink)
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i posted a long reply here a few hours ago, but it just disappeared.. dont have time to retype it now, but i will a little later..
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Old 04-16-2002, 10:36 PM   #8 (permalink)
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it doesnt sound good....any time the belt goes your lookin for major damage. But the pump not turning? It should be fairly easy to turn and it is the water pump in that picture. Do the compression test and then if (hopefully) everything is ok, go ahead and do the 60k service. You do need the tensioner, this is what keeps the timing belt from slacking up. You will also need:

new water pump
timing belt
while your at it:
a/c belt
power steering belt

i think thats about it. It should take around 8 hrs or so? I cant really remember but its hard as hell to get your hands in there. good luck again.
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Old 04-17-2002, 10:02 AM   #9 (permalink)
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how do you do a compression test with no timming belt ?
will he cause more damage by turning the engine and pistons will hit the valves...mabey a leak down test instead ?
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Old 04-17-2002, 06:32 PM   #10 (permalink)
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to all the people that have had the timing belts go out on them...how many miles were on your cars? i have about 63,000 and have the parts, i'm just trying to scape enough money together to get them installed because i don't trust my self with something so important to get done right
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