12 Valve Engine and Drivetrain Talk about the 12V engine and drivetrain here. This is for 1994-1998.5 engine and drivetrain discussion only.

broke the timing pin.

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Old Sep 10, 2011 | 04:38 PM
  #1  
Sawyer1's Avatar
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Angry broke the timing pin.

I was barring the engine and pushing on the pin with a long bar and went too fast I guess and heard a snap and now I have no pin to find #1 TDC. will it hurt anything if the tip falls out while the engine is running? How do I find TDC to set my valves now?
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Old Sep 10, 2011 | 06:10 PM
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The other way to do the valves is the "running mate" technique.

Basically cylinders 1-6, 2-5 and 3-4 come to TDC at the same time just on opposite cycles. So when 1 is at TDC compression, 6 is at TDC going from exhaust to intake stroke. You bar the engine until cylinder 6 exhaust valves just close and intakes open. You can hear/feel compression as you approach TDC. Then you set both intake and exhaust on 1. Then you follow the firing order of 1-5-3-6-2-4.

The pin is just plastic and will probably stay in the gear. shouldn't be a problem If it really concerns you it can be taken out by removing the holder and timing pin button and rotating to get it lined up to tug out.
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Old Sep 10, 2011 | 06:51 PM
  #3  
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Originally Posted by Lil Dog
The other way to do the valves is the "running mate" technique.

Basically cylinders 1-6, 2-5 and 3-4 come to TDC at the same time just on opposite cycles. So when 1 is at TDC compression, 6 is at TDC going from exhaust to intake stroke. You bar the engine until cylinder 6 exhaust valves just close and intakes open. You can hear/feel compression as you approach TDC. Then you set both intake and exhaust on 1. Then you follow the firing order of 1-5-3-6-2-4.

The pin is just plastic and will probably stay in the gear. shouldn't be a problem If it really concerns you it can be taken out by removing the holder and timing pin button and rotating to get it lined up to tug out.
Well I set the valves a bit different. i turned the engine till the intake on #6 was almost closed and the exhaust was just starting to move then set the valves as if on #1TDC rotated engine 360degrees and set the valves as if on #6TDC. Started it up and purrs like a kitten.
I don't think I will try to remove the pin holder as it is too tight a fit for my hands to get in with a torx wrench and i don't feel like pulling the vac pump to do that so it will just have to stay. Thanks for your reply.
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Old Sep 11, 2011 | 12:20 PM
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If the intake was closing and exhaust was opening, then it was in reverse rotation, but is the same either way.
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