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 09-10-2011, 04:38 PM
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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?
Old 09-10-2011, 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.
Old 09-10-2011, 06:51 PM
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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.
Old 09-11-2011, 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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