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#1 Vrdaddy OFFLINE  

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Posted March 11, 2018 - 11:12 AM

Hey all, working on my Continental AU7R engine and replacing the gaskets on the gear reduction assembly,looks like at one time someone had it off and threw the "Blue Goo" sealant to it, question is I got two rolls of gasket maker as you can't find replacement gaskets for these engines,the one roll is the grey asbestos free material, the other is the cork type. I never really used these before as most engines I messed with you could get replacement gaskets for fairly easy,has anyone had any luck with these and which would be the best? Second question is, looking in the crankcase, I noticed alot of yellowish stain all over that doesn't seem to come off,there is a strong distinct smell of stale gas,the cylinder wall from what I can see doesn't seem to be damaged,all mechanical parts "seem" so far to look good. Has anybody seen this yellowish stain before? Thanks for any information.

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Edited by Vrdaddy, March 11, 2018 - 11:14 AM.

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#2 James Bosma OFFLINE  

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Posted March 11, 2018 - 11:34 AM

I would use the grey gasket material, or use good automotive silicone

If using silicone, apply silicone, let set for few minutes, lightly assemble, tighten bolts about a hour later

Cork would not last long, good for valve covers


Yellowish stain and stale gas smell makes me think its shellac build up from old gas, same stuff found in carburetors

Gas must have been inside the base for awhile for that to happen

Maybe someone washed it out with gas years ago and put it up

Edited by James Bosma, March 11, 2018 - 05:25 PM.

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#3 onetonford OFFLINE  

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Posted March 16, 2018 - 08:15 PM

If you have the old gaskets check for thickness as sometimes they are also shimming for the bearings etc.

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#4 olcowhand OFFLINE  


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Posted March 16, 2018 - 08:18 PM

Definitely NOT the cork!

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#5 SupplySergeant OFFLINE  


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Posted March 16, 2018 - 08:44 PM

Yellow might be zinc chromate, old mechanical stuff was often painted with it in non-visible areas for corrosion protection. Especially if it was ever military. https://en.wikipedia...version_coating

Edited by SupplySergeant, March 16, 2018 - 08:46 PM.

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