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#1 |
Franko72
Join Date: May 2004
Location: Cincinnati,Ohio
Posts: 471
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rear main seal?motorheads needed
I have been noticing motor oil on the floor of my garage located directly under the area between the bell housing and the rear of the oil pan. I changed the valve cover gaskets. changed the intake gaskets . The problem is still there.I guess that I am in denial but have to face the facts. How hard is it to change out a rear main seal on my 72 402 Big Block?Do I need to pull the motor or seperate the Transmission to get to it?Where else could the oil be leaking from or what is a good way of being sure that it is the rear main seal.
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![]() 1972 C20 cheyenne Super 402 BB/400 turbo LWB A/C Tilt, Cruise Control, Saddle tanks, Tach My Home Page Better to burn out than it is to rust Last edited by franko72; 01-14-2005 at 09:20 PM. |
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#2 |
Beer Power!!!!!!!!!!
Join Date: Nov 2003
Location: Nacogdoches, TX
Posts: 280
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What kind of Tranny is it? My 3 speed is leaking gear oil and it looks like the rear main is leaking.
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Rather be fishin' |
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#3 |
Franko72
Join Date: May 2004
Location: Cincinnati,Ohio
Posts: 471
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automatic 400 turbo . It is definitly motor oil. I guess i'll try the chiltons if no one replys
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![]() 1972 C20 cheyenne Super 402 BB/400 turbo LWB A/C Tilt, Cruise Control, Saddle tanks, Tach My Home Page Better to burn out than it is to rust |
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#4 |
Franko72
Join Date: May 2004
Location: Cincinnati,Ohio
Posts: 471
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any help out there?
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![]() 1972 C20 cheyenne Super 402 BB/400 turbo LWB A/C Tilt, Cruise Control, Saddle tanks, Tach My Home Page Better to burn out than it is to rust |
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#5 |
Registered User
Join Date: Aug 2004
Location: Overland Park, KS
Posts: 79
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If it is like a small block you would put a block of wood - chunk of 2x4 between the motor mounts to raise the engine up so you can pull the pan then you can get to the rear seal. Watch the dist. as you jack the motor up. Not to bad....
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#6 |
Registered User
Join Date: Nov 2004
Location: Cameron, Oklahoma
Posts: 199
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I pulled the pan off mine once with it in the truck. The pickup tube came out of the oil pump. It's been so long ago, I really don't remember what I had to do to get it off. Must not have been too hard though, I was on a camping trip. Fixed it at the lake. Had to have it to pull my boat back home. Now that I think about it, that was almost 30 years ago. I don't think she's ever failed me since. The top half of those seals can be hard to get out sometimes, but have patience. Frank
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#7 |
Senior Member
![]() Join Date: Mar 2003
Location: Colfax-California
Posts: 8,553
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Be sure it is the main seal first, possible it could be just the rear arch seal of the pan.
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#8 |
Registered User
Join Date: May 2003
Location: Shreveport LA
Posts: 3,170
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Check the oil pressure sender too.
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#9 |
Chevy Nuttttt
Join Date: Sep 2004
Location: Santa Maria Ca.
Posts: 568
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if the truck is a 4x4 the pan will come down with no problems. if it is 2wd you have to jack up the motor and put blocks behind the mounts. then the pan will come off. after that pull the pump and rear main cap. one half will be in the cap and the other you will need to push out with a small swrew driver (be careful not to gouge the crank) or the provided tool with the new seal. then put it back together. torque the bolts and put the pan back on.
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67' Chev swb step side 69' SS elky 03' Chev ext cab 4X4 hey who lernt me to spell ![]() ![]() |
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#10 |
Registered User
Join Date: Jun 2002
Location: central pa
Posts: 1,525
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I have changed the rear seal on my 1 ton with it still in the truck. It is a tight fit but the oil pan can come off. The big problem is the rear seal trying to push the old seal out them buggers are really stuck in there. The only other issue is getting the pan gasket to seal good with all of the movement to get it back on, PATIENCE>>>Patience take your time.
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72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne |
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#11 |
Registered User
![]() Join Date: Jun 2003
Location: West Valley City, Ut
Posts: 311
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seal
you should try to stager the seal sections so the main cap and the seal is not in the same place. when you put the new seal in the top half make sure you push it in approx a 1/4 to 3/8 of an inch past the smooth surface of the block. also put a small dab of silicone on the ends of the seal.
Dwayne
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72' GMC Suburban 10 1/2" of Lift, 40" Tires! Waiting for restoration ![]() 67' Chevy, What to do??? And Bad Ass American Bulldogs! |
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#12 |
Franko72
Join Date: May 2004
Location: Cincinnati,Ohio
Posts: 471
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Thanks for the info!
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![]() 1972 C20 cheyenne Super 402 BB/400 turbo LWB A/C Tilt, Cruise Control, Saddle tanks, Tach My Home Page Better to burn out than it is to rust |
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#13 |
Registered User
Join Date: Feb 2002
Location: Vacaville, CA
Posts: 2,746
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I wouldnt try to change the oil pan on a 2wd with the engine in the truck. I had to replace the timing chain on mine, and I have not been able to get the oil pan back on. Now I have to wait until I make some space in the garage so I can pull the engine and do it that way. I wish I had know to begin with that I needed to pull the engine, becasue I have been trying to get it put back together since august now. lol
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#14 | |
go cyclones
Join Date: Jun 2003
Location: Ames, IA
Posts: 1,885
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