Use of RTV with 1 piece oil pan gasket?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rfmaster · 02-17-2013, 01:56 AM

This is an old question which keep coming back - do you use RTV or any other gasket sealer with 1 piece oil pan gasket such as Fel Pro 1880K? I just pulled an oil pan of a recently built 350 which was put on dry except for the half moon corners. It leaked at the bottom of the front lip, while the rest of the gasket perimeter was dry like a rock. Which begs the question - should RTV be used and where??? Does any one know? Fel Pro installation sheet that comes with gasket is rather useless in this regard. Oil pan appears to be flat and square.

Thanks
//RF

Lee H · 02-17-2013, 10:54 AM

Only a dab in the corners.
Posted via Mobile Device

ZEKE68 · 02-17-2013, 11:23 AM

I use a small amount only where there are joints in the gaskets. We all know what happens when you put silicone RTV on a rubber gasket and tighten it up. The gasket squeshes out and sometime splits. I put some on the joint areas, then assemble it and snug the bolts enough to have firm contact to seat everything then let it set until the RTV cures before going to final torque.

Pyrotechnic · 02-17-2013, 04:49 PM

I had to find out the hard way that they don't seal if installed dry. Get Permatex gray RTV.

Gumby · 02-17-2013, 07:14 PM

just a very ubar thin layer on the pan, to glue the gasket to it, so it not moving around when being bolted up. [trans pans too]

rfmaster · 02-17-2013, 11:39 PM

Thanks for feedback fellows - in this engine build black RTV was used on the oil pan rails, but not on the half moons (back and front). The front half moon leaked like sieve - I suspect that I had malformed oil pan or timing chain cover. On the next go around both will be replaced with better pieces in addition to black (or gray) RTV.

//RF

GASoline71 · 02-17-2013, 11:47 PM

Quote:

Originally Posted by Lee H

Only a dab in the corners.

This ^^^

I've installed at least a dozen of the Fel-pro 1 piece oil pan gaskets with only a dab of RTV in the corners. No leaks yet.

Gary

rfmaster · 02-18-2013, 03:52 AM

Quote:

Originally Posted by GASoline71

This ^^^

I've installed at least a dozen of the Fel-pro 1 piece oil pan gaskets with only a dab of RTV in the corners. No leaks yet.

Gary

Alright Gary - I'll do it the same way. Film at 11pm.

//RF

02-17-2013, 01:56 AM	#1
rfmaster Registered User Join Date: Oct 2003 Location: OC CA Posts: 1,374	Use of RTV with 1 piece oil pan gasket?? This is an old question which keep coming back - do you use RTV or any other gasket sealer with 1 piece oil pan gasket such as Fel Pro 1880K? I just pulled an oil pan of a recently built 350 which was put on dry except for the half moon corners. It leaked at the bottom of the front lip, while the rest of the gasket perimeter was dry like a rock. Which begs the question - should RTV be used and where??? Does any one know? Fel Pro installation sheet that comes with gasket is rather useless in this regard. Oil pan appears to be flat and square. Thanks //RF __________________ "The Beast" 1975 Chevrolet C20 longbed 350/700R4! with 3inch body lift Dual Flowmasters Super 40's! TBI retrofit completed (2007-07-29) New 383CID (+030) 08-304-8 9.5:1CR x36,005 (2012-12-17)

02-17-2013, 10:54 AM	#2
Lee H Registered User Join Date: Jun 2010 Location: Upland Ca Posts: 4,147	Re: Use of RTV with 1 piece oil pan gasket?? Only a dab in the corners. Posted via Mobile Device __________________ 1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703

02-17-2013, 11:23 AM	#3
ZEKE68 Registered User Join Date: Jul 2012 Location: Space Coast, Florida Posts: 403	Re: Use of RTV with 1 piece oil pan gasket?? I use a small amount only where there are joints in the gaskets. We all know what happens when you put silicone RTV on a rubber gasket and tighten it up. The gasket squeshes out and sometime splits. I put some on the joint areas, then assemble it and snug the bolts enough to have firm contact to seat everything then let it set until the RTV cures before going to final torque.

02-17-2013, 04:49 PM	#4
Pyrotechnic Registered User Join Date: Feb 2007 Location: Austin, TX Posts: 3,930	Re: Use of RTV with 1 piece oil pan gasket?? I had to find out the hard way that they don't seal if installed dry. Get Permatex gray RTV. __________________ 1977 GMC Sierra Grande

02-17-2013, 07:14 PM	#5
Gumby Registered User Join Date: Dec 2008 Location: NW-Ohio Posts: 2,525	Re: Use of RTV with 1 piece oil pan gasket?? just a very ubar thin layer on the pan, to glue the gasket to it, so it not moving around when being bolted up. [trans pans too] __________________ Chevy GMC Trucks Find Of The Day https://www.facebook.com/ChevyGmcTrucksFindOfTheDay or http://ChevyGMCTrucks.com

02-17-2013, 11:39 PM	#6
rfmaster Registered User Join Date: Oct 2003 Location: OC CA Posts: 1,374	Re: Use of RTV with 1 piece oil pan gasket?? Thanks for feedback fellows - in this engine build black RTV was used on the oil pan rails, but not on the half moons (back and front). The front half moon leaked like sieve - I suspect that I had malformed oil pan or timing chain cover. On the next go around both will be replaced with better pieces in addition to black (or gray) RTV. //RF __________________ "The Beast" 1975 Chevrolet C20 longbed 350/700R4! with 3inch body lift Dual Flowmasters Super 40's! TBI retrofit completed (2007-07-29) New 383CID (+030) 08-304-8 9.5:1CR x36,005 (2012-12-17)

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