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Timing belt broken need advise. #315272
October 05, 2009 11:21 pm UTC
October 05, 2009 11:21 pm UTC
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Paul Bebnowski Offline OP
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Hey so this is what happend as i was driving normally down the road my car just suddenly died i didnt hear any bangs or pops, as i was pulling into the gas station in neatral i put it into first gear and tried to get the engine started by roll.. that also did not work. I tried to start it with the key, and the engine wont turn over i can hear a lound buzzing sound from the starter.

I took the top timing belt cover off to notice that it had lots of threads coming off the actual belt.

So now my real question is, is this an easy fix? Like can i just change the belt or does something else get broken after the belt?

This is frustrating as i just bought this engine FULLY rebuilt and with HKS cams.. basicly the works.


Burgundy '91 TSi- 3" turbo back,big 16g,adjKYBs,FMIC,RC 550's, 255Lph, Rebuilt engine,ect
Re: Timing belt broken need advise. [Re: Paul Bebnowski] #315273
October 05, 2009 11:30 pm UTC
October 05, 2009 11:30 pm UTC
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Brian Fernandez Offline
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Take the valve cover off, see if the valves are damaged.
If they are, you will need a head, gasket, and a T belt job


Duramax
Re: Timing belt broken need advise. [Re: Brian Fernandez] #315274
October 05, 2009 11:34 pm UTC
October 05, 2009 11:34 pm UTC
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Paul Bebnowski Offline OP
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Thanks brian i will check it out but how will i know? what do i look for?

Also do i need to pull out the whole engine just to replace the head and tbelt?


Burgundy '91 TSi- 3" turbo back,big 16g,adjKYBs,FMIC,RC 550's, 255Lph, Rebuilt engine,ect
Re: Timing belt broken need advise. [Re: Paul Bebnowski] #315275
October 06, 2009 12:08 am UTC
October 06, 2009 12:08 am UTC
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Tim Grechin Offline
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You'll likely have to replace the head as well. 99.9% of the time you do when the belts break. Who put the motor together?


11.254@132.14MPH - Tractionally impaired
Re: Timing belt broken need advise. [Re: Tim Grechin] #315276
October 06, 2009 12:22 am UTC
October 06, 2009 12:22 am UTC
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Brampton
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Paul Bebnowski Offline OP
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i got it off someone on this forum


Burgundy '91 TSi- 3" turbo back,big 16g,adjKYBs,FMIC,RC 550's, 255Lph, Rebuilt engine,ect
Re: Timing belt broken need advise. [Re: Paul Bebnowski] #315296
October 06, 2009 01:42 am UTC
October 06, 2009 01:42 am UTC
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St Albert, Alberta, Canada
Adam Weinhandl Offline
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Bent valve, guaranteed. Happened to me as I was crawling to a stop and even then I didn't escape unscathed. Sorry 'bout your luck.


92' Plymouth Laser RS Turbo - Tractionally Impaired.
Wheel hopped so hard, I broke my headlight.
Re: Timing belt broken need advise. [Re: Brian Fernandez] #315398
October 07, 2009 12:07 pm UTC
October 07, 2009 12:07 pm UTC
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Ontario
Malcolm Harris Offline
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You will have to replace a piston(s) aswell because the valve(s)will be planted in them, the atempted to bum start it wouldn't help the sitch either. your buzzing starter is free wheeling the crank most likly with no t-belt to join things, (stop turning it over), So, complete head with gasket, t-belt, atleast one or two pistons, bore the cylinders, clean out metal chunks they will end up in the turbo blades, I'm sure there will be more. Did you inspect the t-belt job before putting it in you car?.

Re: Timing belt broken need advise. [Re: Malcolm Harris] #315412
October 07, 2009 02:55 pm UTC
October 07, 2009 02:55 pm UTC
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Whitby, ON
Mike Kozlakowski Offline
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I would say piston damage from a broken t-belt is rare. Unless a valve actually broke off (like this), the piston and cylinder walls should be fine. The head casting may be reusable after new guides are installed (the machine shop will tell you). The pistons have those dents in the from the factory (for valve clearance), they are not a sign of impact although they sure do look like it.


Mike - '92 RS-AWD-T   <- SOLD
Re: Timing belt broken need advise. [Re: Mike Kozlakowski] #315425
October 07, 2009 04:28 pm UTC
October 07, 2009 04:28 pm UTC
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Malcolm Harris Offline
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I've seen them planted on the piston before and broken off at the stem, along with chunks of valves that scored the walls and made there way into the turbine wheel finishing off the turbo(not worth fixing), busted and missing rockers that made there way into the oil pan that I've seen on two different motors. a new head, pistons, turbo and a honeing (sp) put the motor back on the road but it was never the same (attributed to the level of repairs of course), and yes the pistons have small groves for valve clearance but if the valves stop moving and your in gear you get planted busted valves when they meet the pistons or if you try to bum start it you get similar results with less damage.

Re: Timing belt broken need advise. [Re: Malcolm Harris] #315431
October 07, 2009 05:00 pm UTC
October 07, 2009 05:00 pm UTC
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Tim Grechin Offline
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If no valves are sheared in half, you won't have to replace the block. I've only seen one valve ever break into a piston and it was done on a car with incorrect timing to begin with.


11.254@132.14MPH - Tractionally impaired
Re: Timing belt broken need advise. [Re: Tim Grechin] #315439
October 07, 2009 05:41 pm UTC
October 07, 2009 05:41 pm UTC
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Ajax, ON
Reza Mirza Offline
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I would be more worried about a broken piece of valve digging into the cylinder wall, rather than a ding on the piston.

So not busted valves, and the block should still be fine.


1G DSM: 1000+ AWHP, 9.2@162.83 MPH
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Re: Timing belt broken need advise. [Re: Tim Grechin] #315454
October 07, 2009 08:32 pm UTC
October 07, 2009 08:32 pm UTC
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Ryan Rae Offline
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It all depends on how fast you were going to. I bent 6 exhaust valves while going over a speed bump lol, so i wasnt going very fast. Speed doesnt help the situation, either does trying to turn it over. But i dont think you would have damaged the pistons but you wont know until you take the head off.

Last edited by Ryan Rae; October 07, 2009 08:41 pm UTC.

1997 TSI FWD AUTO... SOLD
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Re: Timing belt broken need advise. [Re: Ryan Rae] #315467
October 07, 2009 10:17 pm UTC
October 07, 2009 10:17 pm UTC
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Paul Bebnowski Offline OP
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wow thanks for all your comments, your right i should just take off the head and bring it to a machine shop, get them to check it out for me.. i could manage putting the rest together.


Burgundy '91 TSi- 3" turbo back,big 16g,adjKYBs,FMIC,RC 550's, 255Lph, Rebuilt engine,ect
Re: Timing belt broken need advise. [Re: Paul Bebnowski] #315469
October 07, 2009 10:20 pm UTC
October 07, 2009 10:20 pm UTC
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Paul Bebnowski Offline OP
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as for how fast i was going (Ryan) .. like 70km.. then i remember looking at my knock and it went to 47 and engine died.

Strange i thought if i blew my motor i would hear it.


Burgundy '91 TSi- 3" turbo back,big 16g,adjKYBs,FMIC,RC 550's, 255Lph, Rebuilt engine,ect
Re: Timing belt broken need advise. [Re: Paul Bebnowski] #315521
October 08, 2009 05:54 am UTC
October 08, 2009 05:54 am UTC
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Olds, Alberta
Cody Dyck Offline
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This is what I found when I took the head off of the car I bought with a broken timing belt, all of the valves were still in one piece, but all of them had hit a piston.

[Linked Image]


DSM owner since 1998.
Re: Timing belt broken need advise. [Re: Cody Dyck] #315532
October 08, 2009 12:36 pm UTC
October 08, 2009 12:36 pm UTC
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Paul Kruger Offline
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Since we're sharing photos, this was at idle. Piston damage isn't tough once valves hit them.

[Linked Image]

[Linked Image]

[Linked Image]

[Linked Image]

Paul

Last edited by Paul Kruger; October 08, 2009 01:03 pm UTC.
Re: Timing belt broken need advise. [Re: Paul Kruger] #315588
October 08, 2009 09:22 pm UTC
October 08, 2009 09:22 pm UTC
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Malcolm Harris Offline
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Ah ha, I would say piston damage isn't rare at all from t-belt failure, in fact if I took a pic of the others I've seen like above you might think it is the same motor, thats how consistant the damage is with that kind of failure. Lets hope Paul B. motor looks like Cody's pic.

Re: Timing belt broken need advise. [Re: Malcolm Harris] #315664
October 09, 2009 03:58 pm UTC
October 09, 2009 03:58 pm UTC
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Whitby, ON
Mike Kozlakowski Offline
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That's a lot of carnage for idle. The ones I've seen were like Cody's pics. Paul B. - we need some pics, is the head off yet?

Last edited by Mike Kozlakowski; October 09, 2009 03:59 pm UTC.

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Re: Timing belt broken need advise. [Re: Mike Kozlakowski] #315666
October 09, 2009 04:16 pm UTC
October 09, 2009 04:16 pm UTC
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Stacey Shaw Offline
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I bent 10 valves and the car was NOT even running. I got the t-belt changed and tensioner, brought the car home, alternator went. Ordered alt, replaced it and was trying to get car started when tensioner failed. Oil leaked out of the tensioner and FAIL. When trying to start, it briefly fired then nothing. Back to the shop it went. Of course this happened when I was green to talons and I paid for the head job. A live and learn. Now only I touch the t-belt. That accident was a great educator and motivator.

Last edited by Stacey Shaw; October 09, 2009 04:16 pm UTC.

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