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Old May 3rd, 2020, 12:15 AM   #1
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seal or not to seal?

History has it all motors I''ve built over the years I use a sealer on the gaskets, even back to spraying silver paint way back in the '60s........
The latest 888 I've received bak from the experts is leaking oil from the exhaust covers that were dry fitted. My wkshop manuals has no mention of 3bond or similar.......
Whats the braintrust's opinion.......????
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Old May 4th, 2020, 02:27 AM   #2
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Exhaust covers?

Oh and I was silver frosting in the 80s.
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Old May 5th, 2020, 08:47 AM   #3
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I've been a fan of using a light coating of Hylomar for these types of gaskets (presuming you mean valve access covers). Never hardens and is oil compatible. Makes removal easy when you next need to do work. Any squeeze out can be addressed by wiping with mineral spirits.
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Old May 6th, 2020, 05:22 AM   #4
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Ah... those exhaust covers. Never seen them with any sealant.

I’ve usually done...

Cardboard gasket .. permatex 3J ( gorilla snot)

Head gaskets... hylomar

Alloy no gasket.. loctite 515 gasket... this is my favourite stuff.

Hi temp gaskets.. htb grease.

Alloy no gaskets but dodgy build.. 3 bond.
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Old May 7th, 2020, 02:20 AM   #5
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My guess is the 'Experts' refitted the covers using the old gaskets. They usually weep after being disturbed. OR.... they over tightened them and buckled the covers/cracked a bolt hole with the same result. 3 bond is your friend in these circumstances.
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