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Vintage Technical Tips & Tricks Technical and maintenance tips and links. DO NOT POST YOUR QUESTIONS HERE!! Please post questions to the general forum.

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Old 02-07-2011, 04:26 PM   #1 (permalink)
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gasket sealant or not ???

When rebuilding these old Trumpets, do you pros out there use gasket sealant on all the gaskets or none of them ?? Primary?, timing cover?, inner and outer trani covers ?? Thanks.
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Old 02-08-2011, 04:20 AM   #2 (permalink)
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I use Gaskacinch to hold the primary gasket to the cover.

Everybody pretty much uses ThreeBond #4 (the grey stuff aka Yamabond, Hondabond, etc.) on the case joint surfaces.
I think everywhere else you can use dry gaskets. Some covers didn't come from the factory with gaskets, but are now supplied aftermarket like the inner and outer transmission cover. If you choose not to use the gaskets, use the ThreeBond.

I have also used it in place of the primary gasket in an emergency and it worked just fine.
I'm probably the only one who does this, but I don't use the rocker arm O-rings, but use ThreeBond instead.
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Old 02-08-2011, 04:39 AM   #3 (permalink)
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Quote:
Originally Posted by catchalot View Post
When rebuilding these old Trumpets, do you pros out there use gasket sealant on all the gaskets or none of them ?? Primary?, timing cover?, inner and outer trani covers ?? Thanks.
On recommendation from a local Tri mechanic years ago, I use Three bond White (hi temp silicone) as well as Three Bond Gray. The white stuff is dear to me here in Australia ($45.00 for 100g) but I have found it worth it. I use it where I think I am not likely to get away with the gray - rocker boxes for example.
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Old 02-08-2011, 12:07 PM   #4 (permalink)
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primary case...grease both sides
timing case....dry..used one to get a tad more clearance for 4 valve pump
oil pump.... wet with oil at assy
oil junction block...wet with oil
alternator cover...ThreeBond, Permatex, etc to cover side
rocker boxes...dry...use the good sandwich gaskets, you'll probably be able to reuse them with a little care
copper washers...fully anneal and flat sand
inspection caps...soak in oil and good luck...I'm making up some copper for those, will post results...I think Webby has got his to not leak.
ThreeBond seems fairly easy to clean up with a bit of B-12 or acetone. Except for the drive sprocket, I won't use silicone.
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Old 02-08-2011, 12:54 PM   #5 (permalink)
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Thanks for the info !!
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Old 02-09-2011, 03:01 PM   #6 (permalink)
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I'm with Buckshot on this one, I used "Wellseal" (a non drying type sealant) for the case joint. For everything else get good quality gaskets and smear them with high temp grease, that includes the head gasket.
The only places I have RTV type sealant is a light smear on the gearbox output shaft to stop gearbox oil from leaking down the splines.
As for the rocker covers, I've installed 'O' rings everywhere, they work well for the large tappet access holes but the smaller ones on the side would still weep a little oil so there's a little RTV in there too, it also stops them from vibrating loose.

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Old 02-09-2011, 10:30 PM   #7 (permalink)
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Webby,

Did you seal the boxes to the head with o-ring as well? Way cool if you did. I would like to have just about everything done with o-rings. Probably will remain a fantasy.
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Old 04-11-2012, 06:10 PM   #8 (permalink)
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Question on using gasket sealant on gaskets.

Hi all,

I see this info given:
Quote:
primary case...grease both sides
timing case....dry..used one to get a tad more clearance for 4 valve pump
oil pump.... wet with oil at assy
oil junction block...wet with oil
alternator cover...ThreeBond, Permatex, etc to cover side
rocker boxes...dry...use the good sandwich gaskets, you'll probably be able to reuse them with a little care
copper washers...fully anneal and flat sand
inspection caps...soak in oil and good luck...I'm making up some copper for those, will post results...I think Webby has got his to not leak.
ThreeBond seems fairly easy to clean up with a bit of B-12 or acetone. Except for the drive sprocket, I won't use silicone.
I read to keep the cylinder barrel gasket dry, and what BuckShot1mentions is great info. Is it ok to use a little permatex Copper Spray-A-Gasket on it?

By grease on the primary (outer) cover - I'm curious why grease vs. dry, or a light Spray-a-gasket would be used.

Gearbox case - do you recommend a dry gasket?

thanks
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Old 04-11-2012, 09:22 PM   #9 (permalink)
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Grease will soak into the gasket and swell it as well as aiding removal without tearing later. My opinion only. I would also grease gearbox gasket. YMMV.
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Old 04-12-2012, 03:20 AM   #10 (permalink)
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Quote:
Originally Posted by Webby View Post
I'm with Buckshot on this one, I used "Wellseal" (a non drying type sealant) for the case joint. For everything else get good quality gaskets and smear them with high temp grease, that includes the head gasket.
The only places I have RTV type sealant is a light smear on the gearbox output shaft to stop gearbox oil from leaking down the splines.
As for the rocker covers, I've installed 'O' rings everywhere, they work well for the large tappet access holes but the smaller ones on the side would still weep a little oil so there's a little RTV in there too, it also stops them from vibrating loose.

Webby
Me too Webby, though many swear by their RTV sealants.

As the "Enlightened Ones" know, crankcase pressure is the real villian when it comes to niggardly leaks. RR
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