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Ford Truck Club Forum > FORD F-100 | F-150 SERIES > 1973-1991 Ford F150

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Old November 25th, 2018, 10:40 AM
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sammyd sammyd is offline

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Default Oil problem

I have a 77 400 rebuilt in my truck. Ran great at startup now blowing oil past filter gasket. Is there a passage blocked or what? Any help is appreciated
Old November 25th, 2018, 11:41 AM
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glc glc is offline

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I'd suspect a defective oil filter or the wrong filter was used. Use a Motorcraft FL1A.

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS
Old November 25th, 2018, 12:15 PM
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Used motorcraft fl1a and two other brands, same result, never had this issue before. Was good for a few minutes and then it blows gasket on front side of filter. Didn’t know if there’s a bypass valve or blockage on engine side?

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