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Oil Pan Gasket: What am I doing wrong?

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DH166

Oil Pan Gasket: What am I doing wrong?

I have the 300 4.9 on the stand doing a rebuild and I'm ready to put the oil pan back on and I have a gasket problem. I have a fel-pro four piece gasket. In fact, I have two. At the start of the project, I picked up a couple of gaskets individually before I ultimately decided to buy a full rebuild kit with all the gaskets (which included the same model as the one I had). So, the problem is with the rear rubber gasket. I definitely have the front one on front and the rear one on the rear, so that's not the issue. However, on the back one, there are two rubber knobs/tabs that seem to fit into a notch on either side of the rear seal/bearing. When I fit one of them in that notch and then begin working it to the other side, I end up with a half inch or so extra. If I fit both tabs into their notches, then that extra is a gap in the middle. As I said, I've tried two different units of the same model, from sealed packages, and double checked the fel-pro website for the correct model number. So, it's some kind of user error. Anybody ever run into this? What am I doing wrong?

1981 F100 Custom SWB 2WD 4.9L C4 Auto

Gary Lewis

Re: Oil Pan Gasket: What am I doing wrong?

Administrator

Could you post some pics? That might help us understand what is going on.

Gary, AKA "Gary fellow": Profile

Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI

DH166

Re: Oil Pan Gasket: What am I doing wrong?

This one shows the whole view, without either tab pressed in

The gap left over on one side when it's fitted on the other side

The rubber tab and notch it fits in. A bit hard to see with the tacky gasket sealer clinging to it.

1981 F100 Custom SWB 2WD 4.9L C4 Auto

Gary Lewis

Re: Oil Pan Gasket: What am I doing wrong?

Administrator

I don't think you are doing anything wrong If the tabs are in place wouldn't the pan force the gasket to conform to the engine?

Gary, AKA "Gary fellow": Profile

Frank Wyatt

Re: Oil Pan Gasket: What am I doing wrong?

If you can't get the seals to work then why worry about it and just use some RTV.

1981 F 150 Custom 300 ci with a fully rebuilt 1968 240 head Carter YFA T-18 3.25 9" rear 2WD
dual gas tanks
1990 Lincoln Town Car 5.0 AOD
Home town Mc Kenzie, TN

myrl883

Re: Oil Pan Gasket: What am I doing wrong?

Curious, not knocking your choice - why don't you use a one piece gasket? They seldom leak.

Ford Parts Monkey since 1985
1981 F100 Flareside - Black, 302-4V Roller/AOD
1986 F150 Flareside - Medium Fire Red 302/AOD
1989 F150 Standard Cab 4x4 - Dk Shadow Blue 302/AOD
1993 F350 4x4 Crew Cab - 7.3 IDI/ZF-5
I think it's a sickness...

1986F150Six

Re: Oil Pan Gasket: What am I doing wrong?

Administrator

myrl883 wrote

Curious, not knocking your choice - why don't you use a one piece gasket? They seldom leak.

1987 and up.

myrl883

Re: Oil Pan Gasket: What am I doing wrong?

I thought they would retrofit, but I'm not totally familiar with 300s - they tend to not follow me home...