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#411385 - 01/02/12 4:16 pm Re: cylinder head ***** [Re: TriVin]  
Joined: Jan 2003
Posts: 554
drp Offline
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west central ohio where all be...
Last year my 71 T120 starting fouling both plugs. Checked everything and decided to pull the head. The head gasket was leaking oil and as predicted the small washers had created the depressions. I bought an interchangeable Pilot Type - Counter bore tool from Enco for a little more than $30.00 with the pilot and did mine on my drill press at about 500 RPM, it worked great and put in the hardened washers. The 0-ring under the washer trick is a good idea.

Dave

Last edited by drp; 01/02/12 4:24 pm.
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#411388 - 01/02/12 4:31 pm Re: cylinder head [Re: drp]  
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raf940 Offline
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gastonia nc
jubee.........where did you get those orings?


1972 Triumph T120
1968 BSA A65
1968 MGB Roadster
1979 Chevrolet Camaro Berlinetta
1969 Honda Mini Trail
1939 farmall f30 tractor
2004 Honda Shadow Aero
1972 BSA Thunderbolt
1975 yamaha xs650b
1972 Norton commando project
#411409 - 01/02/12 6:29 pm Re: cylinder head [Re: TriVin]  
Joined: Nov 2005
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JubeePrince Online content
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Back on the mainland!
raf -

I'm pretty sure I got them from Grainger.com

google "010 Viton O-rings"

Steve


'77 T140J
"Vintage Bike". What's in your garage?

"The paying customer is always right."

Fitting round pegs into square holes since 1961...
#411411 - 01/02/12 6:42 pm Re: cylinder head [Re: TriVin]  
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JubeePrince Online content
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Originally Posted By: TriVin

Interesting point about also putting the same seal on the valve stem.


Yeah, I got the idea from Pete R. Some oil gets through the splits in the valve stem collets, then runs down the stem into the guides and the combustion chamber.

If you place the O-ring on the valve stem before you offer the collets, the O-ring will nest in the taper of the top collar. Any oil coming through the collets will be deflected off the valve stem and top collar. This helps keep the oil out of the valve guides and combustion chambers.

According to John H. this mod was used alot on VW's too.


Steve

Last edited by JubeePrince; 01/03/12 3:02 am. Reason: clarify O-ring procedure

'77 T140J
"Vintage Bike". What's in your garage?

"The paying customer is always right."

Fitting round pegs into square holes since 1961...
#411480 - 01/03/12 2:17 am Re: cylinder head [Re: JubeePrince]  
Joined: Jul 2009
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Pete R - R.I.P. Offline
In Remembrance
Pete R - R.I.P.  Offline
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Joined: Jul 2009
Posts: 3,549
Vic. Australia
The best way to fit the O-ring is to put it on the stem above the top spring collar.The collets then push it down into the taper of the collar.
Another thing you can do is sharpen the top of the guide like a pencil,about 120 degree included angle.A small flat on the top of the guide bore is OK,but you don't want a chamfer to collect oil.

#411490 - 01/03/12 2:59 am Re: cylinder head [Re: TriVin]  
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JubeePrince Online content
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Pete -

Thanks for the clarification....I was re-reading one of my old posts and took the wrong info from there.... whistle

I've edited my post accordingly. bigt

Steve


'77 T140J
"Vintage Bike". What's in your garage?

"The paying customer is always right."

Fitting round pegs into square holes since 1961...
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