67 Pontiac 400 water pump divider plates - Hot Rod Forum : Hotrodders Bulletin Board
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Old 01-05-2014, 04:38 AM
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67 Pontiac 400 water pump divider plates

Hi, I need help with a 1967 Pontiac Firebird water pump, well the divider plates behind it, in particular. I have searched the posts for this problem and haven't found anything on the 67 400.

I have the 8 bolt water pump used prior to 1968. It has two steel plates in the timing cover behind the water pump. The 68 used 1 divider plate and also had 2 additional rubber gaskets that assisted ins both sealing and alignment of the divider plate.

When I disassembled the water pump it was missing the oil slinger, if it was indeed used in the 67, so I am wondering what else may be missing.

I have a new water pump and the veins are within clearance specs from the divider plate.

Upon pre-assembly, using the parts I have, (the pump, then the gasket, then the 2 divider plates installed in the timing cover) the divider plates float inside the timing cover and rattle, big time. There must be a way to secure them in the proper position while insuring sufficient sealing. (Here is where the rubber O rings from the 68 would come in handy, if they had fit). It wasn't overheating (or rattling) before this procedure.

Has anyone out there dealt with this? Am I missing something?

Here is what I'm thinking of doing. I'm thinking about bending a very small portion of the outer edge of one of the plates, in a few strategic places, to cause it to bind as the water pump bolts are drawn down, eliminating the rattle. Or, maybe someone has used a thin rope seal glued around the edges of the plates to both seal them for optimum water flow and secure them in place?

What do you think?

Oh, Thanks in advance to a great bunch.

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Old 01-05-2014, 06:43 AM
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The 1968-1979 water pumps and timing covers are 11-bolt. The parts will not mix.
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Old 01-05-2014, 08:07 AM
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Old 01-05-2014, 08:15 AM
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I put this plate setup in my cuzzins 69 F Bird. I did tweek the plates a little, here and there.
There is no "Oil Slinger" .The pump has an impeller that spins to createflow.The impeller can be cast or stamped steel.Both work well if the plates are adjusted.
I prefer the cast impellers myself.To each his own.
Getting the plate with the large hole for the impeller surround is the more important issue.If you study it carefully it splits the flow between the left andright inlets of the timing cover.That plate needs to be "adjusted " to be well centered on the impeller.
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Old 01-05-2014, 09:02 AM
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"water pump housing" and divider set may solve this issue - hopefully

Thanks everyone for truly stellar professionalism on this board.
After posting this question, I did find a related post (it was for a 72 455 with an early housing). I received some great response. It's worth a read on the subject. HERE: Pontiac 455 Water Pump Install

To paraphrase, I received confirmation that I indeed had all the parts in fairly good condition minus a dowel pin. I decided to go with a good quality "water pump housing" and divider set and see where my clearances are.

I also received an "Antique Pontiac Tip Of The Day" (link provided above)regarding my missing timing cover alignment dowel, the lack of which may cause front seal failure.

Oh Hey! Great pics. Thanks

Thanks All


I hope further replies will be posted here and be considered recent relevant information. I would quote all the additional info here but I'm afraid that might be against the rules.
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Old 01-05-2014, 09:16 AM
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Thanks, I'll keep a close eye on that surround measurement.
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1967 pontiac 400, 400 water pump

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