Main seal question. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Sport/Truck · 02-03-2007, 02:07 PM

I have my pan off and am going to replace the main seal It’s not leaking, but I figured it should done while I’m in there. This is a good idea isn’t it? I also wanted to know about the oil pump. Should I do anything with it while it’s exposed?
What was the brand name for the one-piece oil pan gasket?
Thanks,
s/t

cdowns · 02-03-2007, 03:17 PM

frlpro pan gasket

if it aint broke dont fix it main seal

Sport/Truck · 02-03-2007, 10:46 PM

one vote DFWI, anyone else?
s/t

fastwillie 696969 · 02-03-2007, 11:14 PM

i would leave the main seal alone if its not leaking you got to remove tranny to get to it and could cause front pump seal to get torn coming out just more work to do
but if you drop the oil pan and replace gasket it would be a good time to change oil pump and screen with new oil shaft

cruiserman · 02-04-2007, 12:08 AM

I wouldn't mess with it if it's not leaking. I faced the same decision when I did the oil pan gasket in my 72 402. I decided to not do it. You don't need to pull the tranny.

fastwillie 696969 · 02-04-2007, 04:42 AM

Quote:

Originally Posted by cruiserman

I wouldn't mess with it if it's not leaking. I faced the same decision when I did the oil pan gasket in my 72 402. I decided to not do it. You don't need to pull the tranny.

your right its a two pc. i was thinking one pc. seal my bad

Sport/Truck · 02-04-2007, 08:38 AM

The engine is out now. Where is this pump seal you mentioned? I'll make sure its not already torn.

cooters · 02-04-2007, 09:33 AM

if the seal isnt leaking, leave it alone, how many miles on the motor? if you need a new pump then you probably need a complete rebuild. Felpro makes 1 piece gasket but are expensive, use ROL or ask engine shop what they carry.

msgross · 02-04-2007, 10:21 AM

I'm in the same place as you are right now, engine out, 78K mi but it sat for 7 years and it's a mess. I'm doing my seal since it is leaking (I think) but going to leave the pump alone. I have good oil pressure and most guys said to just leave it alone. If you get a stock replacement then you have to put the pickup screen in place, PITA so I hear. Some from summit already have it welded in place on the new pump.

1968SWBBigBlock · 02-04-2007, 10:33 AM

Replace the seal, use a one piece pan gasket gasket, and put a little gasket sealer onto the corners of your main bearing cap. If the pan is off changing the rear main seal won't take much longer and will save a ton of headaches WHEN it leaks if you do not do it now. The one piece gasket is worth the price difference hands down - even if you have to collect cans and take them to the recycler to pay for it - I hate leaky oil pans.

kenm78 · 02-04-2007, 12:45 PM

Quote:

Originally Posted by 1968SWBBigBlock

Replace the seal, use a one piece pan gasket gasket, and put a little gasket sealer onto the corners of your main bearing cap. If the pan is off changing the rear main seal won't take much longer and will save a ton of headaches WHEN it leaks if you do not do it now. The one piece gasket is worth the price difference hands down - even if you have to collect cans and take them to the recycler to pay for it - I hate leaky oil pans.

especially since you said the motor was already out. I would also replace the oil pump to be on the safe side. .02

Sport/Truck · 02-05-2007, 02:52 PM

There is no evidence of oiling leaking at the rear main. But figured if there’s no danger or harm installing a new one, thought I might.
Same with the oil pump, seems to be fine.

cdowns · 02-05-2007, 03:57 PM

i've found changing rear main with the crank in isn't a slamdunk for a no leak job//if your determined to change the seal yank the crank freashen up the bearings heck its not that much more to slap a set of rings and a hone job dont forget the new timing chain maybe slip a new cam in while you got it accessable

Sport/Truck · 02-05-2007, 04:28 PM

Good advice on the main seal. I’ll probably let to go.
I really don’t want to get into the whole engine just yet.
Thanks,
s/t

02-03-2007, 02:07 PM	#1
Sport/Truck Sierra Grande Club Join Date: Jan 2007 Location: New Mexico USA Posts: 2,433	Main seal question. I have my pan off and am going to replace the main seal It’s not leaking, but I figured it should done while I’m in there. This is a good idea isn’t it? I also wanted to know about the oil pump. Should I do anything with it while it’s exposed? What was the brand name for the one-piece oil pan gasket? Thanks, s/t __________________ 1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe.

02-03-2007, 03:17 PM	#2
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Main seal question. frlpro pan gasket if it aint broke dont fix it main seal __________________ 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

02-03-2007, 10:46 PM	#3
Sport/Truck Sierra Grande Club Join Date: Jan 2007 Location: New Mexico USA Posts: 2,433	Re: Main seal question. one vote DFWI, anyone else? s/t __________________ 1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe.

02-03-2007, 11:14 PM	#4
fastwillie 696969 ~Rest In Peace~ Join Date: May 2005 Location: CALIFORNIA NOR CAL Posts: 9,707	Re: Main seal question. i would leave the main seal alone if its not leaking you got to remove tranny to get to it and could cause front pump seal to get torn coming out just more work to do but if you drop the oil pan and replace gasket it would be a good time to change oil pump and screen with new oil shaft __________________ is it fast ? it has a lighting bolt donut? B___H please, I can remove 90% of your so called "beauty" with a kleenex

02-04-2007, 12:08 AM	#5
cruiserman Registered User Join Date: Dec 2006 Location: Idaho Posts: 210	Re: Main seal question. I wouldn't mess with it if it's not leaking. I faced the same decision when I did the oil pan gasket in my 72 402. I decided to not do it. You don't need to pull the tranny. __________________ 72 C2500 LWB 402 Sierra Grande 05 Odyssey 08 Tundra

02-04-2007, 08:38 AM	#7
Sport/Truck Sierra Grande Club Join Date: Jan 2007 Location: New Mexico USA Posts: 2,433	Re: Main seal question. The engine is out now. Where is this pump seal you mentioned? I'll make sure its not already torn. __________________ 1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe. Last edited by Sport/Truck; 02-04-2007 at 08:41 AM.

02-04-2007, 09:33 AM	#8
cooters Senior Member Join Date: Oct 2006 Location: Edmonton Alberta Posts: 458	Re: Main seal question. if the seal isnt leaking, leave it alone, how many miles on the motor? if you need a new pump then you probably need a complete rebuild. Felpro makes 1 piece gasket but are expensive, use ROL or ask engine shop what they carry.

02-04-2007, 10:21 AM	#9
msgross Registered User Join Date: Jul 2006 Location: Central PA Posts: 12,201	Re: Main seal question. I'm in the same place as you are right now, engine out, 78K mi but it sat for 7 years and it's a mess. I'm doing my seal since it is leaking (I think) but going to leave the pump alone. I have good oil pressure and most guys said to just leave it alone. If you get a stock replacement then you have to put the pickup screen in place, PITA so I hear. Some from summit already have it welded in place on the new pump. __________________ The Garage: 1968 K-10 SWB - "Project Money Pit" 1996 Z-71 - "huntin rig" 1969 C-10 LWB (SOLD) "Project flip that truck or else" 1993 Passport, F@rd 1-ton (SOLD)"Project Cousin Eddie" My Garage Build "The 1,000 footer"

02-04-2007, 10:33 AM	#10
1968SWBBigBlock Active Member Join Date: Oct 2006 Location: Ohio Posts: 1,643	Re: Main seal question. Replace the seal, use a one piece pan gasket gasket, and put a little gasket sealer onto the corners of your main bearing cap. If the pan is off changing the rear main seal won't take much longer and will save a ton of headaches WHEN it leaks if you do not do it now. The one piece gasket is worth the price difference hands down - even if you have to collect cans and take them to the recycler to pay for it - I hate leaky oil pans. __________________ 1968 SWB 454 + .040, 490HP x 540 FT pounds of Torque 10-1 Kb Forged pistons, recon rods w/ ARP wave loc bolts 781 heads Ported with 2.19/1.88 SSTvalves Lunati 60204 cam, Micro Trol lifters, Ported Edelbrock Performer Rpm manifold armor coated, Pertronix Triple Strike Ignition Holley 770 Street Avenger carb,Headers armor coated Built by Watson Ruppel Performance in Sarahsville Ohio. Hardshift Tranny Built Turbo 350,TSI 10" 3000 stall 12 Bolt Eaton Posi 4.10 Richmond Gears moser axles 18.5" x 31" Hoosier Pro Street Radials ET Classic 5 Wheels - polished Power Steering, Power Brakes,Disc Brakes,Tach & Gauge Dash, Tilt,Factory Air (gone) Custom Paint & Body Work Special thanks to my wife, my son and my money tree

02-05-2007, 02:52 PM	#12
Sport/Truck Sierra Grande Club Join Date: Jan 2007 Location: New Mexico USA Posts: 2,433	Re: Main seal question. There is no evidence of oiling leaking at the rear main. But figured if there’s no danger or harm installing a new one, thought I might. Same with the oil pump, seems to be fine. __________________ 1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe.

02-05-2007, 03:57 PM	#13
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Main seal question. i've found changing rear main with the crank in isn't a slamdunk for a no leak job//if your determined to change the seal yank the crank freashen up the bearings heck its not that much more to slap a set of rings and a hone job dont forget the new timing chain maybe slip a new cam in while you got it accessable __________________ 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

02-05-2007, 04:28 PM	#14
Sport/Truck Sierra Grande Club Join Date: Jan 2007 Location: New Mexico USA Posts: 2,433	Re: Main seal question. Good advice on the main seal. I’ll probably let to go. I really don’t want to get into the whole engine just yet. Thanks, s/t __________________ 1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe.



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.