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#1 |
Registered User
Join Date: Aug 2013
Location: Greencastle, PA
Posts: 14
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1967 GMC 305 V6 rear main seal
I am currently rebuilding a 305 v6 motor out of my 1967 GMC C3500 truck. I order gasket set from summit and got a rope style rear main seal part # felpro BS 40048. I am trying to find a rubber nos seal, not too confident in using a rope seal.......
As you guys can tell im new to this forum and is my first post so if you have any suggestions for future posts let me know thanks!!! |
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#2 |
Registered User
Join Date: Feb 2015
Location: bakersville, NC
Posts: 60
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Re: 1967 GMC 305 V6 rear main seal
I mess with Pontiacs and they use a rope seal. Just run a VERY thin bead of rtv in the center of the journal and it'll be fine. I prefer mega black rtv.
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The Pontiac V8: the original Super Duty. |
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#3 |
Registered User
Join Date: Mar 2012
Location: Boulder, CO
Posts: 350
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Re: 1967 GMC 305 V6 rear main seal
I use Loctite 5970 for sealing situations that involve fuel (gasoline or diesel) or engine oil or transmission lube. It's used for tricky, specific German car repairs- it stays pliable, is stable to about 400* F, and doesn't break down in automotive lubes. Not super cheap, but well worth the cost for peace of mind. If you've ever had to break down a Mercedes cylinder head or VW/Audi (or Porsche) transmission, or BMW rear end, to seal a leak, you would pay double the price to avoid not going through it again. On another note, I didn't realise that a garter seal was available for such an application, at least without machine work to accommodate it.
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#4 |
Senior Member
![]() Join Date: Mar 2003
Location: Colfax-California
Posts: 8,554
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Re: 1967 GMC 305 V6 rear main seal
I don't know if this will help or not, but the 5.7 GM diesel (shudder) which had a rope seal would take a 460 ford neoprene. Had to trim the ends about 3/16, but I did it all the time. Don't know what the main diameter is on that old V6 is in comparison, but if you could get some measurements...
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#5 |
CAN'T FIX NOTHIN
Join Date: Sep 2006
Location: SOUTHRUST VIRGINIA !!!
Posts: 2,112
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Re: 1967 GMC 305 V6 rear main seal
I never used a rope seal on the rear main before myself but I knew they used them ,
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1967 C10 Shortbed Fleetside Small back glass 6 cyl 3spd on the tree 3.08 gears underdash AC |
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#6 |
Registered User
Join Date: Feb 2008
Location: Tacoma Washington
Posts: 890
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Re: 1967 GMC 305 V6 rear main seal
The rope seal will be fine. That motor doesn't spin that fast anyway. BTW, I always loved those V-6's, from the 305 up!
Jeff
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I know a guy who's addicted to brake fluid. He says he can stop any time. 72 K10 396 75 Cj5 MPI 350 Chev 67 Chevelle 396, 4 speed 74 FXE 08 Tahoe |
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#7 |
Registered User
Join Date: Aug 2013
Location: Greencastle, PA
Posts: 14
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Re: 1967 GMC 305 V6 rear main seal
okay guys thanks for the great input and help. So I trying to cut and trim a rope seal and had very little luck, could have done a better job with a hack saw. What do you guys use to cut a rope seal? I tried to use razor blade and scissors, razor blade had best results but still wasn't really pleased with quality of cut...
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#8 |
Registered User
Join Date: Aug 2013
Location: Greencastle, PA
Posts: 14
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Re: 1967 GMC 305 V6 rear main seal
yeah motocritter i actually worked at a mercedes dealer for the past 2 year roughly but moved back to an independent shop again, i have used 5900 loctite sealer and it is amazing and still have some in my box
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#9 |
Registered User
Join Date: Feb 2015
Location: bakersville, NC
Posts: 60
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Re: 1967 GMC 305 V6 rear main seal
I always use an exacto knife with a new blade. Use very firm pressure and move it back and forth slightly. Only like a 1/16th or so. I have also used tin snips. But only when I got over excited and rtv'ed it into place first lol.
__________________
The Pontiac V8: the original Super Duty. |
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#10 | |
Registered User
Join Date: Aug 2005
Location: Mechanicsburg, PA
Posts: 86
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#11 |
Registered User
Join Date: Aug 2013
Location: Greencastle, PA
Posts: 14
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Re: 1967 GMC 305 V6 rear main seal
Yeah LSGARAGE i read the description on summit and with the same part number and it said rubber too...maybe i will try to get one from napa and see if its any different thanks for that info
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