351M Problem
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Junior User
Joined: May 2008
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From: Union,NJ
351M Problem
Hello Im in the final stages of a project
a 1996 Ranger body on a 1979 Bronco chassis
the engine is a fresh rebuild
Aussie heads,cam etc........
The radiator is mounted in the bed
the engine keeps overheating
I have fans on the radiator with the switch on the engine
I think i got all the air out of the system but it keeps overheating
I have a Edelbrock intake.
is there any coolant flow through the intake manifold ?
I dont think there is
but there is a threaded hole in the intake next to the dist that i have plugged
I think the ported vacuum switch went there
Is there soposed to be coolant flow through the front of the intake ?
if so this would explain my overheating problem .
HELP !
a 1996 Ranger body on a 1979 Bronco chassis
the engine is a fresh rebuild
Aussie heads,cam etc........
The radiator is mounted in the bed
the engine keeps overheating
I have fans on the radiator with the switch on the engine
I think i got all the air out of the system but it keeps overheating
I have a Edelbrock intake.
is there any coolant flow through the intake manifold ?
I dont think there is
but there is a threaded hole in the intake next to the dist that i have plugged
I think the ported vacuum switch went there
Is there soposed to be coolant flow through the front of the intake ?
if so this would explain my overheating problem .
HELP !
I'll have the Roast Duck
Joined: Jul 2002
Posts: 9,622
Likes: 108
From: Northshore, MN
probably need to measure your cfm flow with your electric fans. I assume the overheating is done regardless if it is idling or moving. Also, there could be extra heat from the break-in of the engine as the friction is more. Just a couple thoughts.
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Junior User
Joined: May 2008
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From: Union,NJ
3200 cfm from 2 12" fans
the fans are not the problem
I think i have a coolant flow problem
why would there be a large threaded hole in the front of the intake if no coolant flows through it?
I think the ported vacuum switch went there
the fans are not the problem
I think i have a coolant flow problem
why would there be a large threaded hole in the front of the intake if no coolant flows through it?
I think the ported vacuum switch went there
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Junior User
Joined: May 2008
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From: Union,NJ
that is possible i guess
I used the fel pro performance head gaskets .045 thick
I still have the new stock fel pro gaskets
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Junior User
Joined: May 2008
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From: Union,NJ
today i will remove the t stat and see what kind of flow i got
A backwards thermostat comes to mind. Also the wrong gasket on the water pump. Another possibility would be the head gaskets on backwards
still stumped
A backwards thermostat comes to mind. Also the wrong gasket on the water pump. Another possibility would be the head gaskets on backwards
still stumped
Last edited by fleetbob1; May 26, 2008 at 09:32 AM. Reason: l
Cargo Master
Joined: Apr 2001
Posts: 2,364
Likes: 3
From: Eustis FL
Heating up after 5 minutes? I would say there is a definite lack of flow somewhere... If you end up pulling the head gaskets, look closely for the coolant passageways in the block and head, and the gaskets.
You might also jack up the back of the truck (since that's where the rad is now) and run the engine with the pressure cap off the radiator for a bit to try and run out any air bubbles...?
Did you install a new water pump?
You might also jack up the back of the truck (since that's where the rad is now) and run the engine with the pressure cap off the radiator for a bit to try and run out any air bubbles...?
Did you install a new water pump?
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Junior User
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From: Union,NJ
the water pump is new, the rad is new,
and i ran it without the cap
it overheats after about 15 minutes not 5
im going to remove the t stat and try it
if that doesent work i will remove the upper hose and see if i have good flow
if i dont, the next step would be to remove the heads and replace the head gaskets
when i ran it yesterday i opend the pipe plug at the top of the t stat housing to bleed off air and no water came out---just steam
im prolly going to have to do the head gaskets
and i ran it without the cap
it overheats after about 15 minutes not 5
im going to remove the t stat and try it
if that doesent work i will remove the upper hose and see if i have good flow
if i dont, the next step would be to remove the heads and replace the head gaskets
when i ran it yesterday i opend the pipe plug at the top of the t stat housing to bleed off air and no water came out---just steam
im prolly going to have to do the head gaskets
Laughing Gas
Joined: Nov 2003
Posts: 898
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From: southeren Oh
Bedore i'd run without a thermostat I'd take an old one and gut it. Just run the outer part of a thermostat. It is possible to have too much coolant flow.
Do you remember if the head gaskets looked different on each side?
If so with the gaskets on the block they should have the different sides facing up. (there are usally two of the exact same head gasket in a gasket set).
Do you remember if the head gaskets looked different on each side?
If so with the gaskets on the block they should have the different sides facing up. (there are usally two of the exact same head gasket in a gasket set).
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Junior User
Joined: May 2008
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From: Union,NJ
too much flow at this point would be a good thing
i think i put the gaskets on right but there was no markings on them
i have a set of stock head gaskets (i found out later they are the same thickness as the performance ones)they are marked.
why were there 3 different gaskets for the water pump? , I think i used the right ones
the others didnt fit right
i think i put the gaskets on right but there was no markings on them
i have a set of stock head gaskets (i found out later they are the same thickness as the performance ones)they are marked.
why were there 3 different gaskets for the water pump? , I think i used the right ones
the others didnt fit right