Re: [Amc-list] Overflow, overflowing

[Wayne E LaMothe <superglider@xxxxxxxx>]

If it was me, I would be doing a cold and hot compression check to look
at ruling out a head gasket.

Wayne
Wayne & Lisa, Bolton Landing NY
66 Ambo 990 wagon, 69 Ambo Coupe
2003 FLHTCI, 2000 WJ
2001 XJ, 2002 STS Northstar
 
On Tue, 28 Oct 2008 10:22:55 -0500 Keith Evenson <epd@xxxxxxxxxxxx>
writes:
> 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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