Re: [Amc-list] Overflow, overflowing

[Joe Fulton <piper_pa20@xxxxxxxxxxx>]

Sounds like you may have a defective radiator cap.  You might not need a 15 psi cap but you might need a new one at your present capacity (14 psi?).  Or your cooling system efficiency (dirty radiator, rusty cooling passages in block) could be just at the limit for the amount of power (and heat) that the engine makes.  When you exceed that limit, things go haywire.

Joe Fulton

--- On Tue, 10/28/08, Keith Evenson <epd@xxxxxxxxxxxx> wrote:

> From: Keith Evenson <epd@xxxxxxxxxxxx>
> Subject: [Amc-list] Overflow, overflowing
> To: "drivers and fans. AMC/Rambler owners" <amc-list@xxxxxxxxxxxx>
> Date: Tuesday, October 28, 2008, 8:22 AM
> So I have talked to many mechanics at various dealers and
> private  
> shops and nobody can give me a good answer to why my
> overflow tank on  
> my radiator is overflowing. Here is the story, about a
> month ago I  
> drove my 70 Jav with a 360 (slightly built) to my brothers
> shop 15  
> miles away. It was a nice night so I was driving a bit
> harder then  
> normal just having fun with my car. When I got there my
> overflow tank  
> was spraying out the overflow hole. I have stared with
> simple repairs  
> and gone up, I have replaced the line to the overflow tank
> and  
> cleaned it to make sure it is not blocked and has a tight
> connection  
> to the radiator. I have replaced my rad. cap, I have taken
> out the  
> thermostat. I have done multiple pressure tests on the rad.
> to see if  
> it builds pressure and it does not. I do not have any white
> smoke or  
> coolant in my oil. I have driven it up to 80 miles with out
> getting  
> on it and the level in my overflow tank does not change
> but, I can  
> take it out when it is cold and drive it hard for 2 miles
> (a few hard  
> starts off the line) and it will be overflowing before I
> can get the  
> hood open. I was just told to put a 15lb cap in the
> radiator since it  
> is not a stock motor it may need a higher pressure cap.  I
> have been  
> told it was the head gasket or cracked head, but since it
> does not  
> build pressure when I drive it without getting on it that
> does not  
> seem like the problem either. Could I be looking at some
> kind of  
> vacuum leak? Any help would be great. I don't want to
> pull my heads  
> if I don't have to.
> 
> 
> 
> Keith Evenson
> 
> 
> 
> 
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