General Category > General Discussion

? Silicone "Coating" in valve covers

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Chuck in Indiana:

--- Quote from: chuck peterson on July 04, 2022, 04:33:57 AM ---On a tangent to this…

Tomb is always quite proud of a set of valve covers from a company called Blake, if I recall..

A bit taller with additional finning, the inside was indeed layered with some heat/oil resistant thick coating (rubbery)  to reduce the tappet noise..

--- End quote ---

Yeah, those are pretty rare these days.

Wayne Orwig:
One issue with the Guzzi is that the valve covers stuck out there in the cold air get a lot of condensation in them.
Maybe it was an attempt to insulate the cover, and maybe reduce the condensation.
Interesting idea, but having the silicone disintegrate inside the motor would do more damage than the moisture.

No idea on the rivet in the cover.

John A:
Maybe he used the rivet to plug a hole from a previous attempt at what he was trying to accomplish.

Chuck in Indiana:

--- Quote from: John A on July 04, 2022, 12:37:17 PM ---Maybe he used the rivet to plug a hole from a previous attempt at what he was trying to accomplish.

--- End quote ---

I would say that is as good a guess as any. I believe the "Tips" book said a feminine napkin would quiet them down.  :rolleyes:

Francois25:
Thanks for your replies. Should add that valve covers are off of non-running parts motor that I purchased. Motor has cast-iron liners so I know that's something to work with. Will probably never use these valve covers , but if I do I will clean them up .

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