(pics) timing belt slipped...

1612 Views 12 Replies 7 Participants Last post by greenstreak, Nov 23, 2005

houstonECLIPSE

Discussion Starter · Nov 22, 2005

nov. 2 on was on my way to school when a horrible noise comes from the engine. i coast to the shoulder and after a tow home i began to diagnose what happened. it turned out that the bolt that holds the crank sprocket gear was gone and that the timing belt slipped. the horrible noise was my valves hitting the pistons. after removing the head i see all the exhaust valves bent.

after finally getting all the parts and the head back from the machine shop i begin to put everything back together. everything is going smoothly until i get to the timing belt. i couldn't get all the marks to line up at the same time. the exhaust cam was the one where i couldn't get the dowel pin to 12 o'clock. it felt like valves were hitting pistons and keeping the cam from turning. at this point i'm really pissed. after spending over an hour trying to figure out the problem, i decide to swap the exhaust cam with one i had in my 98 head. after doing this everything lined up perfect. it turned out that the dowel pin on the original cam wasn't attached to the cam anymore. when i removed the cam gear the pin just fell out. it must have snapped off when the valves hit the pistons.

the car is running now and driving pretty good. i'm posting this more as an fyi, so this won't happen to anyone here. ask any questions if you like.

lupe

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Dustin16

· #2 · Nov 22, 2005

Man that really sucks, but looks good with everything cleaned up. Glad to hear it all went back together smoothly. What where you doing when it snapped? cruising or getting on it? and im geussing this cost you more time and money than just doing a timing belt job. Not saying thats what cause yours to mess up, but just evidence for those people who skimp on doing timing belt jobs that the consequences arent worth waiting.
Dustin

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Slownis

· #3 · Nov 22, 2005

I doubt it was lack of timing belt job on his part. The crank shaft bolt are in pretty tight from the factory. I had a heck of a time removing mine both times I attempted it. I think they are supposed to have loctite from the factory on them as well (I could be wrong on this, please correct me). My guess is that whoever did his last tbelt job didn't torque it correctly and didn't use loctite.

You didn't mention removing the block in your post. Mind sharing your secret as to how you got the deck so smooth and clean looking? I'm in the middle of a rebuild myself, but I'm not removing the block from the car, so I can't take it somewhere to get it machined or cleaned.

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0lmytsi

· #4 · Nov 22, 2005

How did you clean up the pistons?

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houstonECLIPSE

Discussion Starter · #5 · Nov 22, 2005

i used a drill with a wire wheel attachment on the block and the pistons. where the valves hit the pistons i used a small piece of sand paper to smooth out the sharp spots.

lupe

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pUtInExIm

· #6 · Nov 22, 2005

What the hell?? Can you tell me where you got the valve (third from the right)? It does not look like any DSM valve that I have seen.

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0lmytsi

· #7 · Nov 22, 2005

Thanx for the information

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houstonECLIPSE

Discussion Starter · #8 · Nov 22, 2005

pUtInExIm said:
What the hell?? Can you tell me where you got the valve (third from the right)? It does not look like any DSM valve that I have seen.

good question. i don't know. that's not one of the valves that the machine shop had to replace so it was already there from before. this head came from a 1990 talon awd so who knows where that valve came from. its some brand of aftermarket oem valve. but i'm with you, i too have never seen a valve like that before.

lupe

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Dustin16

· #9 · Nov 22, 2005

Slownis said:
I doubt it was lack of timing belt job on his part.

I wasnt implying that it was a lack of timing belt job on anyones part in this case. Just that the carnage that resulted is a example of what can happen when timing belts dicide to take a dump.

P.S. is it just me or does that bolt just looked stripped?

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Slownis

· #10 · Nov 22, 2005

Good call. If it was cross threaded it could have worked its way out easily. That would point fault squarely at whoever worked down there last as well.

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tarantula

· #11 · Nov 23, 2005

pUtInExIm said:
What the hell?? Can you tell me where you got the valve (third from the right)? It does not look like any DSM valve that I have seen.

Won't that valve being un dished cause very slight compression build up. Like it would raise the compression on that cylinder just a tad.? Also nice job on the cleaning. What head gasket did you use? and did you use that copper spray stuff?