FF1600 Front Crankshaft (Pulley) Seals
Ford has used three distinct seal types for the 1.6L "Kent" (Formula Ford 1600) engine. All of them will work with the stock V-belt pulley or our toothed belt pulley.
The latest "dry" style seal (164-20, Ford part number 96BM-6700-A6B) will fit all front covers. This unique seal has a PTFE coating and is installed dry.
The middle "narrow" style lip seal (164-19, replaces Ford part number 83BM-6700-A4A) will also fit all covers. This is the familiar rubber-lip seal which requires a dab of grease around the inside of the lip on installation.
The earliest "wide" style lip seal (formerly 164-18, replaced Ford part numbers 701M-9700-A1A and D1FZ-6700-B) could only fit the earliest front covers (Ford part number 681F-6059-A-A, originally used on non-uprated engines). This style cover has a completely smooth bore for the seal with no retaining tabs. The quick external identifier is a drilled passage in the cover for a dipstick (which may be plugged on a racing engine). Note that this seal is no longer available, but either the "dry" or "narrow" seals will fit these covers with no modifications.