Lycoming TEO-540-C1A Maintenance Manual page 197

TEO-540-C1A Engine Maintenance Manual
TEO-540-C1A Engine Maintenance Manual
D. Solid-Ring Crankshaft Oil Seal Installation
NOTICE: If necessary, a crankshaft oil seal can be replaced with the engine assembled and
installed in the airframe. Refer to the latest revision of Service Instruction No. SI-1324
for instructions for crankshaft oil seal removal, seal bore cleaning, and crankshaft oil
seal installation on an installed engine.
NOTICE: Install a new crankshaft oil seal during crankshaft assembly. There are two types of
crankshaft oil seals: a split oil seal (Figure 52) and the solid-ring crankshaft oil seal
(with an internal spring) (Figure 53). The split oil seal is open for easy assembly
around the crankshaft. The solid-ring crankshaft oil seal has more elasticity and can
be stretched over the crankshaft propeller flange. The solid-ring crankshaft oil seal
can be installed on the crankshaft before or after the crankshaft is installed in the
crankcase. The split oil seal is installed after the crankshaft is installed in the
crankcase per the "Crankshaft Oil Seal Installation" procedure later in this chapter.
NOTICE: An oversize crankshaft oil seal could be necessary if the crankcase bore size was
increased. Part numbers for oversized parts include a "P" suffix, such as –P50 and
are identified on the face of the seal. Except for the revised outside diameter of the
seals, the oversize seals are identical in other aspects to the standard size seals.
For correct sealing, remove all traces of the oil sealant and oil from the crankcase
before installation of a new crankshaft oil seal.
(1) If not already done, complete the "Starter Ring Gear Support Removal" procedure in
Chapter 72-70.
(2) Examine the propeller flange, crankshaft sealing surface, and the crankcase seal bore
recess for any scratches or nicks that damage or cause the seal to leak; if scratches or
nicks are found, remove them with fine emery cloth (150 to 220-grit for very light metal
sanding) or equivalent small fine abrasive stone. Remove any residue.
CAUTION
© 2018 Avco Corporation. All Rights Reserved
November 2018
Figure 52
Split Oil Seal
IF MEK IS USED IN THE NEXT STEP, ONLY APPLY MEK TO THE
CRANKCASE, INCLUDING THE CRANKCASE BORE AND
GROOVE FOR THE CRANKSHAFT OIL SEAL. DO NOT APPLY
MEK TO THE CRANKSHAFT OIL SEAL SINCE MEK CAN CAUSE
THE SEAL TO DETERIORATE. BE SURE THAT ALL TRACES OF
MEK OR ANY CLEANING SOLVENT, OIL, AND SEALANT ARE
REMOVED PRIOR TO INSTALLATION OF A NEW CRANKSHAFT
OIL SEAL.
Figure 53
Solid-Ring Crankshaft Oil Seal
72-20
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