Permatex
HDF Community Team
Joined: Jun 2006
Posts: 12,763
Likes: 2,597
From: san antonio
I stand corrected on whether or not HD assembles cases using an RTV sealant. I should have been more specific as the earlier reference to sealant was to RTV silicone. I should have said that the HD case sealant was not RTV silicone. I suspect that the HD cases are assemble at the factory via an automated computer controlled process with zero chance for error which is a bit different from a DIY guy assembling cases in the garage. I am not a 25 year Ford tech but have assembled a few HD cases and I will keep using Threebond and/or Yamabond as they are pretty forgiving. The HD sealant might be as well, don't know but Threebond and Yamabond are great products; I have also used them in lieu of base gaskets on cases that have been bored and the o-ring groove eliminate; none have leaked.
Road Captain
Joined: Jun 2013
Posts: 671
Likes: 168
From: Ontario, Canada
I stand corrected on whether or not HD assembles cases using an RTV sealant. I should have been more specific as the earlier reference to sealant was to RTV silicone. I should have said that the HD case sealant was not RTV silicone. I suspect that the HD cases are assemble at the factory via an automated computer controlled process with zero chance for error which is a bit different from a DIY guy assembling cases in the garage. I am not a 25 year Ford tech but have assembled a few HD cases and I will keep using Threebond and/or Yamabond as they are pretty forgiving. The HD sealant might be as well, don't know but Threebond and Yamabond are great products; I have also used them in lieu of base gaskets on cases that have been bored and the o-ring groove eliminate; none have leaked.
I'm not trying to call anyone out, or say that anyone is wrong to use what they're using. I'm just trying to avoid confusion for guys using the forum to help build these engines in their garage. From what I've been able to find, Harley uses an RTV silicone type sealer, one of a great many such products on the market, most of which would probably work.
My recommendation for any engine assembly is to use what the manufacturer calls for or find out the specification and find a comparable product from your chosen manufacturer. Most of them have an interchange list to make this easier.
HDF Community Team
Joined: Jun 2006
Posts: 12,763
Likes: 2,597
From: san antonio
Originally Posted by Scott
We forgive you DJL.
Last edited by djl; Apr 9, 2019 at 01:08 PM.
Road Captain
Joined: Jun 2013
Posts: 671
Likes: 168
From: Ontario, Canada
[QUOTE=djl;18169786]
Not intentional, sorry if it was interpreted that way. You always have a lot of useful information to give on this forum.
Originally Posted by Scott
Thanks Scott, I did get it wrong. I sure am glad LazySundays didn't call anyone out; that would be unheard of on this forum.
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