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Midget 1500 Hose Connections

bcbug

Freshman Member
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I have a 76 Midget which when I bought had several of the radiator/heater hoses disconnected. My question concerns the intake manifold. One hose attaching on the forward side of the manifold. On the rear, one hose connects to the heater, but there is a second hose connections pointing down. What does this attach to. The po of my car had it pinched off. Thanks.
 
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Do you have a "T" at the rear of the manifold tube?


IIRC from below the thermo to the front of the manifold- thru the manifold to the heater valve Form the heater valve one goes to the heater box, the other goes to the pipe that runs UNDER the manifold (this pipe comes off the rear of the water pump)....trying to remember which side is the coolant feed....anyone?

Basically- when the valve is off coolant is bypassed back to the system- when the valve is on coolant is allowed thru the heater core.

In the pic below I have bypassed the manifold pipe with the black hose below the carbs.


I may have better pics at home....


PICT0972.JPG
 
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Here is a better pic

PICT0498.JPG
 

sparkydave

Jedi Knight
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Bcbug, if you still have the original Zenith Stromberg carburetor, there should be a T fitting that the hose on the rear of the manifold connects to. That T branches off to the thermostatic choke on the carburetor (a.k.a. the water choke). The hose coming back from the water choke connects to the T fitting on the pipe under the manifold that SilentUnicorn referred to, so when the heater valve is off the coolant is going through the water choke. The other branch of the T at the rear of the manifold should go to the heater valve, then to the heater, and the return from the heater goes to the pipe underneath.
 
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Better pic
water choke in the black line..right?


m
 

JPSmit

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bcbug said:
I have a 76 Midget which when I bought had several of the radiator/heater hoses disconnected. My question concerns the intake manifold. One hose attaching on the forward side of the manifold. On the rear, one hose connects to the heater, but there is a second hose connections pointing down. What does this attach to. The po of my car had it pinched off. Thanks.

As said, it would have gone to the water choke - do you have a manual choke? or new carbs? mine is blocked off also
 
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bcbug

bcbug

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I have a manual choke. So in this case the lower branch of the tee would be blocked off as it has nothing to hook to?
 

dklawson

Yoda
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The 1500 Spitfire plumbing (with manual choke) should be similar. In that case there are two pipes and three hoses of interest.

The first pipe is the one that runs through the intake manifold. Water comes off the t-stat housing, through the manifold, and out the back to one of a number of "T" configurations.

A second pipe attaches to the back of the water pump housing and runs under the manifolds. It emerges at the back of the block, sweeping upwards in an arc. In the middle of the arc is a short, horizontal nipple that T's off the pipe. This nipple typically points towards the right inner wing.

A short length of hose connects the horizontal nipple on the second pipe to one of the "T" legs coming off the back of the intake manifold.

One heater hose connects the heater core to the remaining open "T" leg on the back of the intake manifold.

A second heater hose connects the heater valve to the up-swept end of the pipe running under the intake manifold.
 

bthompson

Jedi Warrior
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Here's another image you can use for reference. My '76 came without the water choke. I have a Weber now, but the water connections are the same as for the manual-choke Zenith.

1260507890.jpg


(The black hose running across the top of the intake manifold is the breather line for the charcoal canister.)

Starting from the hard line that runs under the exhaust manifold: it runs up to the top connection on the heater. The bottom heater connection runs to the top connection on the shutoff valve. The bottom shutoff valve runs down, tees into the hard line, and continues on to the intake warmer connection.
 

JPSmit

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bcbug said:
I have a manual choke. So in this case the lower branch of the tee would be blocked off as it has nothing to hook to?

yes
 
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