Jermechanic
Well Known Member
Having trouble locating a SOLID crank seal for my early Lycoming o320 Narrow deck . It has the 6 screws which secure the two oil seal retaining plates .
The split seal is part number is 76940.
Iam hoping to install a solid seal but I don't see a solid seal number for this "small - no lip" type crank seal.
Has any one been down this road on one of these narrow deck lycomings?
Thanks
Jeremy
The following which is an excerpt from the Lycoming Crank seal Service Instruction No. 1324 C helps with more details but doesn't seem to list an option for a (Small) Crankshaft Oil Seal (no molded lip on outside surface)
PARTS DATA:
LW-13792 (Small) Crankshaft Oil Seal (molded lip on outside surface – solid type – three
grooves for glue retention)
LW-13792-P50 (Small) Crankshaft Oil Seal (.050 oversize Outside Diameter (o/s O.D.) for small bore
crankcases – solid type – three grooves for glue retention)
LW-11997 (Small) Crankshaft Oil Seal (molded lip on outside surface – split type)
LW-11997-P50 (Small) Crankshaft Oil Seal (.050 o/s O.D. for small bore crankcases – split type)
78443 (Large) Crankshaft Oil Seal (molded lip on outside surface – split type)
78443-P50 (Large) Crankshaft Oil Seal (.050 o/s O.D. for large bore crankcases – split type)
LW-15628 (Large) Crankshaft Oil Seal (molded lip on outside surface – solid type – three
grooves for glue retention)
LW-15628-P50 (Large) Crankshaft Oil Seal (.050 o/s O.D. for large bore crankcases – solid type –
three grooves for glue retention)
76940 (Small) Crankshaft Oil Seal (no molded lip on outside surface – split type)
74305 Crankshaft Oil Seal (two grooves for glue retention – split type)
The split seal is part number is 76940.
Iam hoping to install a solid seal but I don't see a solid seal number for this "small - no lip" type crank seal.
Has any one been down this road on one of these narrow deck lycomings?
Thanks
Jeremy
The following which is an excerpt from the Lycoming Crank seal Service Instruction No. 1324 C helps with more details but doesn't seem to list an option for a (Small) Crankshaft Oil Seal (no molded lip on outside surface)
PARTS DATA:
LW-13792 (Small) Crankshaft Oil Seal (molded lip on outside surface – solid type – three
grooves for glue retention)
LW-13792-P50 (Small) Crankshaft Oil Seal (.050 oversize Outside Diameter (o/s O.D.) for small bore
crankcases – solid type – three grooves for glue retention)
LW-11997 (Small) Crankshaft Oil Seal (molded lip on outside surface – split type)
LW-11997-P50 (Small) Crankshaft Oil Seal (.050 o/s O.D. for small bore crankcases – split type)
78443 (Large) Crankshaft Oil Seal (molded lip on outside surface – split type)
78443-P50 (Large) Crankshaft Oil Seal (.050 o/s O.D. for large bore crankcases – split type)
LW-15628 (Large) Crankshaft Oil Seal (molded lip on outside surface – solid type – three
grooves for glue retention)
LW-15628-P50 (Large) Crankshaft Oil Seal (.050 o/s O.D. for large bore crankcases – solid type –
three grooves for glue retention)
76940 (Small) Crankshaft Oil Seal (no molded lip on outside surface – split type)
74305 Crankshaft Oil Seal (two grooves for glue retention – split type)
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