3.0 exhaust manifold over heats

Ricky_rich

Ricky_rich

Petty Officer 2nd Class
Joined
Mar 4, 2014
Messages
140
I have a engine with the cooling system as in the picture.
A new exhaust manifold is installed, new impeller and new thermostat.
The engine it self is not running hot, only exhaust manifold getting to hot. I guess that affects carburetor and intake of gas/air, cause after running full throttle for a minute of two engine dies.
Have tried without thermostat but didn't help. I have a good flow of water from the raw water pump.
Is it possible that there could be something wrong between manifold and elbow that restricts water flow?

cooling.jpg
 
Scott Danforth

Scott Danforth

Grumpy Vintage Moderator still playing with boats
Staff member
Joined
Jul 23, 2011
Messages
50,683
Marine engines have constant water flowing to the exhaust manifold.

Verify you have good water flow
 
Ricky_rich

Ricky_rich

Petty Officer 2nd Class
Joined
Mar 4, 2014
Messages
140
Scott Danforth said:
Marine engines have constant water flowing to the exhaust manifold.

Verify you have good water flow
Click to expand...
Yes that oss what I like to have. But if you look at the picture, there will only be a flow through the manifold when the thermostat is open. The constant flow that come from the bypass in the thermostat house connects after the elbow.
I think its a strange system. Would like to switch the hoses from thermostat house, but the are different sizes. Guess I can solve that part if needed. If I do that modification I get cold water from the impeller pump through manifold all the time, and warm water from open thermostat to go out after the elbow.
 
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