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#1 |
Vintage 4x4s
Join Date: Sep 2010
Location: Prior Lake, MN
Posts: 4,305
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2 piece rear main seal questions
It seems most people don't glue the two piece seal in place from the research I've done. If there is no adhesive, what would keep the seal from spinning? even if theres enough friction, wouldn't it be cheap insurance to put adhesive on the seal. Also, I see opinions vary on what to do where the ends of the pieces meet. My instructions don't call for anything but I've heard of people using everything from superglue to sealant here. Thoughts?
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67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades) 67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore ![]() 86 CHV K30 502 th400, apple red NEW 71 CHV K20 350 SM465, ochre (saved work truck) 71 CHV K20 292 SM465, white, tach, PTO, (future project) 72 CHV K20 350 350th, medium blue (project stocker) 01 CHV K2500hd crew, indigo blue ^3 dont run and the others don't see winter either '86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649 '71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642 '72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6 |
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#2 |
18 Till I Die
Join Date: Mar 2005
Location: Alberta, Canada
Posts: 1,522
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Re: 2 piece rear main seal questions
Any rubber joint i use a good sealant, intake corners etc...
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2011 GMC Acadia 1969 GMC BBC LS7 2007 GMC Crew Duramax 1987 Camaro Iroc 350 Tuned Port Injection 42000Km 1987 Chevrolet Silverado 350 TBI 1987 Chevrolet Silverado 350 TBI(yes 2) Take me drunk, I'm too home... ![]() |
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#3 | |
Still plays with trucks
Join Date: Jul 2009
Location: Spokane, WA
Posts: 3,556
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Re: 2 piece rear main seal questions
Quote:
I wouldn't mess with the standard procedure of putting them in dry with a dab of sealant on the staggered ends. With my luck the thickness of the adhesive under the seal would mess up the seal clearance with the crank and cause it to fail prematurely. It would suck to have to do that job again not too long from now when the new seal fails. I say play it safe and do the install like everybody else with no adhesive.
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miSSed opportunity - ground up creation of an AWD 1994 454 SS that never was http://67-72chevytrucks.com/vboard/s...d.php?t=795577 69 C10 shortbed stepside 400 small block - built like what a super sport truck could have been 69 K20 lwb TBI 350 4L60E NP208 14-bolt Dana-44 w/disc 68 Camaro SS / RS 500hp 439 inch roller cam big block 4L80E 79 Malibu TPI 350 4L60 w/ Z28 steering & sway bars |
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#4 |
Registered User
![]() Join Date: Sep 2004
Location: Topeka, Ks
Posts: 604
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Re: 2 piece rear main seal questions
Ive always installed them dry. Main thing I make sure is that the ends of seals don't meet where main cap meets block. Spin seal so ends are staggered in relation to main cap and block joint.
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Daily-94 K2500 350 5spd extended cab longbox Project Red Velvet-68 C20 396-th400-AC-PS-PB-all original except for the 8 track and the gun rack. Build thread>>>>http://67-72chevytrucks.com/vboard/s...d.php?t=495881 My 01 TA and 88 Formula hide in the garage. :-) |
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#5 |
Registered User
![]() Join Date: Apr 2007
Location: Foster Rhode Island
Posts: 1,176
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Re: 2 piece rear main seal questions
I never saw one spin and Ive never put anything as far as sealing the joint either. I agree with 68 TT I'd be afraid to have something extra in there and mess up the clearance on the bearing cap. I wouldnt stagger the joint though,besides that the direction never included that fact ,that Ive ever seen, It seems like the compresion on the seal from tightning the bearing cap is what would keep it from leaking at the joint. That would not be the case if it was turned. I never had one leak after almost 30 years of working on old Chevys. Just my two cents.
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#6 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: 2 piece rear main seal questions
putting sealant adhesive or other goop just makes more for work in the future// gazillion bazillion came off the assembly line dry i figure that is the best way to do it
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#7 |
Vintage 4x4s
Join Date: Sep 2010
Location: Prior Lake, MN
Posts: 4,305
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Re: 2 piece rear main seal questions
Thanks guys! I put it in dry and made sure there was no trace of oil on the surface where it sits. I rotated it so the ends staggered 3/8". That was what was on the felpro instructions and what I heard most frequently.
Didn't seal the ends either.
__________________
67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades) 67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore ![]() 86 CHV K30 502 th400, apple red NEW 71 CHV K20 350 SM465, ochre (saved work truck) 71 CHV K20 292 SM465, white, tach, PTO, (future project) 72 CHV K20 350 350th, medium blue (project stocker) 01 CHV K2500hd crew, indigo blue ^3 dont run and the others don't see winter either '86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649 '71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642 '72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6 |
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#8 | |
Senior Member
![]() Join Date: Oct 2009
Location: Godley, TX
Posts: 17,962
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Re: 2 piece rear main seal questions
Quote:
Actually, I'm with ya cdowns, I normally think that if it's good enough for the factory, any "improvement" I make will probably only screw it up. But in this case, even the factory finally went to a one-piece seal in recognition of the fact that these suckers leaked often enough to be a topic of conversation. My own pers experience - I think the important thing is to make sure the ends are not aligned with the mating surface of the cap (as meatman mentioned above) - I gooned this once and, even with the above mentioned silicone, it leaked bad enough to tick me off. I tried the sneaky pete approach at a repair and I think I only made things worse. So, stagger - yes / silicone sealant - yes, but sparingly, and only where the ends of the halves meet. My 2 cents. Worth about 1 cent. ![]() |
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