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12a Rebuild: Mystery Gaskets (from the kit)

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Old 08-02-14, 03:14 PM
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12a Rebuild: Mystery Gaskets (from the kit)

Preparing to reassemble.

Got the Atkins N201-89-100 gasket kit. I've identified everything but a few gaskets.
In the image:
A - appears to be for the air control valve (I left it attached to the intake manifold)
B - no idea
C - no clue
D and E are identical in shape. I have an E match on the split pipe to the CAT, but not sure about D

Any help will be appreciated.
Attached Thumbnails 12a Rebuild: Mystery Gaskets (from the kit)-mystery-gaskets.jpg  
Old 08-02-14, 03:54 PM
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Maybe for CA models? EGR related perhaps. B is for the OMP.
Old 08-02-14, 04:35 PM
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Originally Posted by NCross
Maybe for CA models? EGR related perhaps. B is for the OMP.
I can see B for a 13B OMP. I have 2 for the 12a OMP.

Could be there are extra's to cover different configurations. I keep them handy just in case.
Old 08-02-14, 05:09 PM
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Originally Posted by NCross
Maybe for CA models? EGR related perhaps. B is for the OMP.
Nah, B is for the 1 inch air pipe that returns to the manifold from the catalytic converter. It connects to the back of the intake manifold.
Old 08-02-14, 05:13 PM
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Tim, if you don't have a few parts left over at the end, you screwed up someplace.

Put those extra gaslets in the FSM, they might come in handy later.
Old 08-02-14, 06:59 PM
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Originally Posted by woodmv
Nah, B is for the 1 inch air pipe that returns to the manifold from the catalytic converter. It connects to the back of the intake manifold.
I believe that one is E. The old one is still on the manifold sitting on the shelf. (image)

I pulled the intake manifold off the shelf.
A is for the air control valve.
B is for the #2 Anti-Afterburn valve (shutter valve)
C is still a mystery

They go somewhere, but nothing I've taken apart as far as I can tell.
Attached Thumbnails 12a Rebuild: Mystery Gaskets (from the kit)-dscn0467.jpg  
Old 08-02-14, 06:59 PM
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Originally Posted by ray green
tim, if you don't have a few parts left over at the end, you screwed up someplace.

Put those extra gaslets in the fsm, they might come in handy later.
"fsm" ?
Old 08-02-14, 08:45 PM
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C is for the altitude compensator valve. hangs on the passenger side of carb. deleted usually in a typical strip down job.
Old 08-02-14, 10:02 PM
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Originally Posted by TimWilbers
I believe that one is E. The old one is still on the manifold sitting on the shelf. (image)

I pulled the intake manifold off the shelf.
A is for the air control valve.
B is for the #2 Anti-Afterburn valve (shutter valve)
C is still a mystery

They go somewhere, but nothing I've taken apart as far as I can tell.
Yup, that's the connection I was talking about. Comes back from the exhaust to the back (aft passenger side) of the intake manifold.
Old 08-03-14, 07:28 AM
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Originally Posted by TimWilbers
"fsm" ?
Factory Service Manual <duh>
Old 08-03-14, 09:23 AM
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Yep, the FSM is good for storing extra gaskets, keeps them flat and protected. You just need to remember they're there.
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