DH166 Posted June 9, 2021 Share Posted June 9, 2021 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? Link to comment Share on other sites More sharing options...
Gary Lewis Posted June 9, 2021 Share Posted June 9, 2021 Could you post some pics? That might help us understand what is going on. Link to comment Share on other sites More sharing options...
DH166 Posted June 10, 2021 Author Share Posted June 10, 2021 Could you post some pics? That might help us understand what is going on. 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. Link to comment Share on other sites More sharing options...
Gary Lewis Posted June 10, 2021 Share Posted June 10, 2021 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. 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? Link to comment Share on other sites More sharing options...
Frank Wyatt Posted June 11, 2021 Share Posted June 11, 2021 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? If you can't get the seals to work then why worry about it and just use some RTV. Link to comment Share on other sites More sharing options...
myrl883 Posted June 28, 2021 Share Posted June 28, 2021 If you can't get the seals to work then why worry about it and just use some RTV. Curious, not knocking your choice - why don't you use a one piece gasket? They seldom leak. Link to comment Share on other sites More sharing options...
1986F150Six Posted June 28, 2021 Share Posted June 28, 2021 Curious, not knocking your choice - why don't you use a one piece gasket? They seldom leak. 1987 and up. Link to comment Share on other sites More sharing options...
myrl883 Posted June 28, 2021 Share Posted June 28, 2021 Curious, not knocking your choice - why don't you use a one piece gasket? They seldom leak. 1987 and up. I thought they would retrofit, but I'm not totally familiar with 300s - they tend to not follow me home... Link to comment Share on other sites More sharing options...
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