Topica Loopframe_Guzzi Archive
 

Subject: RE: Diagnosis

Author: Pete Scheer

Date: Jun 26, 2001, 7:58 AM

Post ID: 1707265322

Well Yes Ive been chewing on this and it seems if you hear air leaking thru
the carb or exhaust that would be valves and I guess I would open the
filler plug and put a finger over it to see about leakage into the crankcase

Seems tho that if I have good compression then I should not have leakage
down into the crankcase since my compression rings are good. But I have no
way to check on the oil ring condition. ( I am thinking as I am writing,
can you tell?)

IN a leakdown test you do it with both valves closed. If it leaks into the
crankcase then compression rings are bad. If it leaks into the carb or
exhaust then the valves are not seating
. I don't think that you can tell the condition of the guides that way.

The more I think about this, the more I think it is either an intake valve
guide or poorly working oil rings.
I don't think oil would leak in thru the exhaust since there is always
pressure blowing out of the cylinder.

I think I'll just pull the head off and measure the valve stems and guides
and see what I get.
Thanks for listening to me ramble on. and tell me if I am off base
anywhere. I am learning as I go here.
Pete


-----Original Message-----
From: Kevin Graf [mailto:kgr-@midwestpension.com]
Sent: Tuesday, June 26, 2001 9:34 AM
To: Loopfram-@topica.com
Subject: RE: Diagnosis


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Acually if an air leak is through the carbs of exhaust, You'd have valve
problems.

Kev


Kevin Graf wrote:
 The way I see it is ... Am I correct to assume that if you hear an air
leak through the breather ,the heads would be a lesser possibility and
vice versa?

Kev


Pete Scheer wrote:
 
Thats 2 votes for valve guides.
I like this possibility. I was not too happy about the possibility of
funding a Nikasil kit.
At least I have another trail to go down now.

Thanks Bruce,
Pete

-----Original Message-----
From: Bruce Giller [mailto:bgil-@mitre.org]
Sent: Tuesday, June 26, 2001 8:42 AM
To: Loopfram-@topica.com
Subject: Re: Diagnosis


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Another means of oil getting in there is thru the valve guides. I
hear-tell that the older guides are more prone to wear than the newer
ones.

Bruce

'72 Eldo

 Trying to figure out a cheap fix for the oil getting to the topside of

 
 
 the
LH piston.
Did a compression check yesterday, good news with both sides at 160

 
 
 psi
(cold) so I am assuming that the chrome is not flaked off and that the

 
 
 oil
rings are the problem and are not expanding like they should.
Changed oil and added a pint of detergent additive hoping that will
free
 
 up
 the rings.
If this doesn't work, I'll have to do some surgery.
Anybody else have experience with stuck oil rings ?

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