Chapter 10: Crankshaft, piston and Connecting Rod
93
Bearings
There are two bearings to inspect; a plain bearing in
the sump and a ball bearing in the cylinder block. To
inspect the bearings:
1. Remove the sump and cylinder block oil seals
using a seal puller. See Figure 10.19.
2. Inspect the bearing surface for galling,
scratches, metal transfer or any other signs of
damage.
3. Measure the inside diameter of the bearings and
compare to the chart at the end of this chapter.
See Figure 10.20.
NOTE: The bearing can not be serviced. If they
are bad the engine must be short blocked.
Figure 10.19
Sump oil seal
Seal puller
Figure 10.20
Measure the
bearing ID
Reassembly
1. Clean the cylinder
1a. Remove all gasket material from all mating
surfaces.
1b. Clean the cylinder and sump.
2. Oil seals
2a. Install a new oil seal in the cylinder block.
NOTE: A piece of 1” schedule 40 PVC pipe can
be used as a seal driver.
2b. Install a new seal in the sump.
See Figure 10.21.
NOTE: Use a Troy-Bilt tiller seal service tool #
TWX-4006 to install the sump oil seal.
Figure 10.21
Troy-Bilt seal drive
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