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RE: Back of intake
By Frank Hager - 03/03/2003 7:38:14 PM; IP 68.115.254.47
Here's what I found on a '64 FE 390 I rebuilt for my '69 F-100 several years ago. I installed a high volume/highpressure oil pump. The retro neopreme rear main seal started leaking and I changed it three times. Then I thought the cam plug behind the flywheel was leaking. Took everything apart to find it as dry as a bone. Pulled the pan again to change the seal. But this time I rechecked the bearing clearance on the rear main and it was .0035 on a standard size crank. Put a .001 undersize bearing in there to tighten things up. Guess what? Oil leak is gone and stayed gone! I'm convinced the rear main oil return to the pan couldn't handle the volume of oil it was being feed and the excess was being pumped out the seal. So, I'd recommend checking that rear main for excessive bearing clearance when you have the pan down.

PS: I've also had the same problem with the bow tie brand!!
This thread, so far...
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Collapse <a href=../ForumFE/reply.aspx?ID=16376&Reply=16376><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor16376" onclick="return false;">390 -rear main seal replacement</a>&nbsp;-- <font color=#0000ff>James, <i>02/23/2003</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=16376', contentMargin: 60, icon: $('anchor16376') }); </script>  390 -rear main seal replacement -- James, 02/23/2003
Collapse <a href=../ForumFE/reply.aspx?ID=16380&Reply=16376><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor16380" onclick="return false;">RE: 390 -rear main seal replacement</a>&nbsp;-- <font color=#0000ff>John, <i>02/23/2003</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=16380', contentMargin: 60, icon: $('anchor16380') }); </script>  RE: 390 -rear main seal replacement -- John, 02/23/2003
 390 rear seal -- dewey, 03/13/2003
 RE: 390 -rear main seal replacement -- Bruce Geister, 02/25/2003
Collapse <a href=../ForumFE/reply.aspx?ID=16410&Reply=16376><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor16410" onclick="return false;">I agree that it's likely an oil plug...</a>&nbsp;-- <font color=#0000ff>Dave Shoe, <i>02/26/2003</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=16410', contentMargin: 60, icon: $('anchor16410') }); </script>  I agree that it's likely an oil plug... -- Dave Shoe, 02/26/2003
 thanks folks -- James, 02/26/2003
Collapse <a href=../ForumFE/reply.aspx?ID=16415&Reply=16376><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor16415" onclick="return false;">Back of intake</a>&nbsp;-- <font color=#0000ff>Terry, <i>02/26/2003</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=16415', contentMargin: 60, icon: $('anchor16415') }); </script>  Back of intake -- Terry, 02/26/2003
Collapse <b>RE: Back of intake</b>&nbsp;-- <font color=#0000ff>Frank Hager, <i>03/03/2003</i></font>RE: Back of intake -- Frank Hager, 03/03/2003
Collapse <a href=../ForumFE/reply.aspx?ID=16446&Reply=16376><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor16446" onclick="return false;">+.0010 bearings?</a>&nbsp;-- <font color=#0000ff>James, <i>03/04/2003</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=16446', contentMargin: 60, icon: $('anchor16446') }); </script>  +.0010 bearings? -- James, 03/04/2003
 RE: +.0010 bearings? -- James, 03/04/2003
 RE: +.0010 bearings? -- Frank Hager, 03/04/2003
 RE: 390 -rear main seal replacement -- Dewey, 03/13/2003
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