The "dollar bill test":
This is a trick mentioned in the Moss catalog and before on the list.
Hold a dollar bill, or any other piece of paper, I suppose, against your
tail pipe. If it goes "snap snap" against the pipe, this tells you that
there is suction there as well as exhaust pressure -- indicating a worn
exhaust valve. In other words, the downstroke is pulling air in from the
exhaust pipe due to the worn valve.
Dan
-----Original Message-----
From: David Stecher <davidandmichelles@email.msn.com>
To: Dan Ray <danray@bluegrass.net>; mgs@autox.team.net <mgs@autox.team.net>;
Wildbil923 <Wildbil923@aol.com>
Date: Saturday, February 28, 1998 7:40 PM
Subject: Re: MGB Temp and oil pressure - future implications
>Dollar bill Test??
>
>SNIP
>>This may have future implications, though, since my compression is low (55
>>on one, 75-80 on the others) and I KNOW that I have a busted exhaust
valve,
>>(snappety snap snap of the pants leg at the tail pipe, forget the dollar
>>bill test!)
>>Dan
>>'73 B
>>-----Original Message-----
>>From: Wildbil923 <Wildbil923@aol.com>
>>To: danray@bluegrass.net <danray@bluegrass.net>
>>Date: Saturday, February 28, 1998 10:50 AM
>>Subject: Re: MGB Temp and oil pressure
>>
>>
>>>Dan:
>>>
>>>Are the readings really high at running speeds? Lots of times overly
high
>>oil
>>>pressure readings are from problems with the oil pressure relief valve.
>>When
>>>I was a lad in the 1960's working for a foreign car garage I used to do
>>these
>>>fixes. I removed the valve (near the oil filter as I recall) and lapped
>in
>>>with a bit of grinding paste. It's been a while though and I'm sure
>others
>>>can do a better job of describing the process. This used to take the
>>pressure
>>>down to okay readings.
>>>
>>>Bill Wilkman
>>>1960 MGA
>>>1060 AH Sprite
>>>1961 AH BT7
>>>
>>
>>
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