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Intake Manifold Leak
- Terry Cockerell
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- HDVETTE
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- JIM.OBRIEN
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Terry - you have to watch those modern thermostats. With the original thermostat there is always water flow - either through the intake manifold or through the radiator. With the modern thermostats there is no flow until the thermostat opens up. Also there is no way to vent the air when you fill the system. Unless you drill a vouple of vent holes in the thermostat as you did in the center one in the photo (at lest that is what it looks like.)
Jim
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- Terry Cockerell
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I have modern high flow thermostats fitted that have a large open throat and do not hinder the flow. The thermostat I am using is at the RHS of the picture. They have a vent built into them.
It has a 160 deg F setting
You end up getting a better result when more people add comments.
T cockerell
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- JIM.OBRIEN
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If you block off the intake manifold you will be dead heading the water pump before the thermostats open up. This may result in the pump cavatating and damaging the impeller and housing. Also when the thermostats are closed there is no vent when filling the system.
AS long as the rest of the manifold is in good shape, for the hole under the GA just drill and tap the hole and LocTite a set screw in there. I would not try welding up the hole. The metalurgy was not real good back the 1930's. I have had good luck welding up some Aluminum pieces and I have had some that could not be welded no matter what you do, you just blow large holes in it.
If you need another intake manifold let me know, I have several spares.
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- Terry Cockerell
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EL is probably correct in saying there is a plug missing near the letters GA. I just figured it was a small hole caused by corosion. I didn't take any pictures of the underside of my inlet manifold.
The idea is to remove the possibility of internal leakage of coolant into the sump. The engine will work fine with the coolant passing through the heads. The inlet manifold was heated by the engine coolant to stop iceing up. The cooling system will work more efficently with the inlect manifold isolated.
There will be no problems with the water pump doing these modifications.
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- George van Nostrand
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Restoring 1936 Cord Westchester sedan.2023 A
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- Terry Cockerell
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The other small hole near the inlet port is a vent that connects with the block.
It is standard practice these days to eliminate coolant from the inlet manifold by blocking it off and just having the coolant run through the heads.
You will have to fit plugs to the side connections below the carburettor and a plug in the pipe connecting with the water pump. A machined disc inside the hoses then clamped with a hose clip usually works ok.
Also you will have to fit a tapered plug into the top of the block. Tap the hole fit a screw in plug then cut and file it flush. You will have to do this like key hole surgery to stop metal debris getting into the rest of the engine.
It would be a good idea to get the small hole near the letters GA seal welded but it may grow with the corrosion inside.
Good luck.
T cockerell
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