quick question - valve cover screw washer

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bnam2
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quick question - valve cover screw washer

Post by bnam2 » Sun Feb 10, 2019 10:42 am

I happen to be in the bay area for a few days this week. Just before I left home, I noticed oil seeping out one of the screws for the exhaust valve cover. I made a mental note to stop at Ace hardware and look for something suitable but forgot to take a measurement. Hoping someone has an ID/OD for that part.

Should I look for rubber washers or copper? What was on there (at lease one was cracked) seemed like some stiff plastic/fiber part.

Thanks!
Byas
1965 Fiat 1500 Cabriolet with 1600twin-cam
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fp55scca
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Re: quick question - valve cover screw washer

Post by fp55scca » Sun Feb 10, 2019 10:57 am

bnam2 wrote:
Sun Feb 10, 2019 10:42 am
.......I noticed oil seeping out one of the screws for the exhaust valve cover. I made a mental note to stop at Ace hardware and look for something suitable but forgot to take a measurement.
......Should I look for rubber washers or copper?
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--The washers are like a fiber material, and are about 14mm ID and 20mm OD. Might be a challenge to find something suitable as a substitute. Any rubber product subject to heat would not be good. I think it would be worthwhile to get a few spares from one of the vendors.
Jim Scurria
Norfolk, VA

1972 Fiat 124 Spider
1971 Spider - SCCA FP-24
1974 CSA Abarth Replica
1981 Fiat Spider Ratrod
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vandor
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Re: quick question - valve cover screw washer

Post by vandor » Sun Feb 10, 2019 7:01 pm

I don't think copper would work, by the time you put enough torque on it to seal you'd be breaking the camtower. I have seen ham fisted mechanics break the part that hold the studs out of the cam towers.
Csaba
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seppanton
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Re: quick question - valve cover screw washer

Post by seppanton » Sun Feb 10, 2019 8:44 pm

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MikeGreer
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Re: quick question - valve cover screw washer

Post by MikeGreer » Sun Feb 10, 2019 9:18 pm

I know shipping is a pita, but order eight of them and just get the real deal, that way you know it works and you don't do more damage than good. I'm sure all the vendors have them.
45 years with a spider, that's a long time
Restoring the '79 for the second time, you're never finished ;)
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rridge
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Re: quick question - valve cover screw washer

Post by rridge » Sun Feb 10, 2019 9:37 pm

Copper washers are the traditional way to seal nuts on aluminum cam covers. The problem with copper is that it work hardens after a single compression and loses the softness needed to seal.

They can be repeatedly reused if they are annealed to regain their softness. Heat them to a red glow with a torch and allow them to air cool. Then limit torque to 7lb/ft., say finger tight plus a quarter turn.

Many "copper" washers are just copper plated steel. Useful for exhaust work but worthless for sealing oil leaks.
Richard
'81 Turbo Spider
Rockville, MD
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