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[GMCnet] Oil Pan Gasket - replacing [message #155278]

Tue, 03 January 2012 17:33

Dwayne

Messages: 418
Registered: October 2007
Location: White Rock BC

Karma: 0

Senior Member

what is the easiest way to get the Oil pan off to change the gasket????

--
Dwayne Jacobson
77 Kingsley - 455
White Rock BC
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Dwayne & Sharon Jacobson
White Rock, BC
77 Eleganza II

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Re: [GMCnet] Oil Pan Gasket - replacing [message #155279 is a reply to message #155278]

Tue, 03 January 2012 17:39

Ken Henderson

Messages: 8726
Registered: March 2004
Location: Americus, GA

Karma: 9

Senior Member

The engine oil pan? There is no easy way.

The transmission MUST come out -- the pan bolts down the left side of the
oil pan are completely concealed by the tranny.

To remove the transmission, you'll have to suspend the rear of the engine
in some manner; next you'll need to remove the front motor mount to allow
the front of the engine to be raised. From there, it's pretty easy.
Sealing the front of the pan to the front main will be the only difficult
part.

Ken H.
Who did it a couple of months ago (since the transmission had to come out
anyway).

On Tue, Jan 3, 2012 at 6:33 PM, Dwayne Jacobson wrote:

> what is the easiest way to get the Oil pan off to change the gasket????
>
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach

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Re: [GMCnet] Oil Pan Gasket - replacing [message #155289 is a reply to message #155278]

Tue, 03 January 2012 18:55

USAussie

Messages: 15912
Registered: July 2007
Location: Sydney, Australia

Karma: 6

Senior Member

Dwayne,

Been there done that, you must remove the transmission / final drive to get to the bolts on the final drive side of the oil pan.

Suggestions:

1) while you've got the pan off check the oil pickup for crud:

http://www.gmcmhphotos.com/photos/showphoto.php?photo=10860

Thanks KelvinD!

2) while you've got the pan out add a second drain in the front part:

http://www.gmcmhphotos.com/photos/showphoto.php?photo=31708

http://www.gmcmhphotos.com/photos/showphoto.php?photo=10340

http://www.gmcmhphotos.com/photos/showphoto.php?photo=10341

Thanks BobS!

3) make sure to check the rear main seal for leakage if it is leaking use a Ford 460 rubber main seal to replace it:

http://www.gmcmhphotos.com/photos/showphoto.php?photo=10859

Thanks KelvinD - again!

4) use a 350 diesel oil pan seal it is a sandwich with a metal center that will not creep out.

Auto-Zone shows Fel-Pro oil pan gasket # OS30471C as standard for the 350 diesel and is shown as optional for the 455 and 403.

Thanks ChuckB!

5) make sure that the gasket seating surface is flat and that where the bolts go through are not raised, I tapped each one down a
bit with two hammers; the round end of a ball peen hammer in the bolt hole and tapped the flat end with another hammer which dimpled
them inwards away from the seal. When you torque the bolts to 10 ft lb (ref. MM X-7525 pg 6A-66) it will pull level again. Let it
sit overnight and torque them again the next morning.

6) apply a sealant to the pan before you put the gasket on to keep it in place so it doesn't move. You can also tie it in place
using thread through holes at each end.

I used:

http://tinyurl.com/yhj8de

http://www.permatex.com/products/automotive/automotive_gasketing/gasket_sealants/auto_Permatex_Aviation_Form-A-Gasket_No_3_Sealant_a
.htm

Thanks MannyT!

7) the gasket has "notches" cut out where the rubber front and rear seals interface with it; apply some silicone sealant there.

Can't think of anything else at the moment, if anybody else can please mention it!

Regards,
Rob M.
�

-----Original Message-----
From: Dwayne Jacobson

what is the easiest way to get the Oil pan off to change the gasket????

Dwayne

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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426

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