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9
9
Cleaning Cylinder
1. Wash the cylinder thoroughly in a solvent
such as kerosene or other commercial
solvent.
2. Wash cylinder again using a stiff brush
with soap and hot water.
3. Rinse cylinder thoroughly with hot running
water.
4. Repeat washing and rinsing until all traces
of honing grit are gone.
NOTE: Honing grit is highly abrasive and will
cause rapid wear to all of the internal
components of the engine.
When cylinder and crankcase have been
thoroughly cleaned, use a clean white rag to
wipe the cylinder bore. If honing grit is still
present, it will appear as a grey residue on the
rag. Re-wash and rinse entire cylinder then
check again. When there is no trace of honing
grit on the rag, the cylinder is properly cleaned.
Oil the cylinder bore to prevent rusting.
MAIN BEARINGS
Check Bearings
Briggs & Stratton OHV engines are equipped
with plain bearings machined into the cylinder or
cover/sump, DU™ bearings, or ball bearings to
support the crankshaft.
Check Plain Bearings
Machined bearings are not repairable. If a
machined bearing is scored or worn, the cylinder
or cover/sump must be replaced.
Check DU™ Bearings
Main bearings should be replaced if scored or if
plug gauge (A, Figure 4) will enter bearing. Try
gauge at several locations in bearing.
Figure 4
Check Ball Bearings
Ball bearings must rotate freely. If any rough
spots are felt, the ball bearing must be replaced
(Figure 5).
NOTE: DO NOT reuse ball bearings. The
bearing races are usually damaged during
removal.
Figure 5
NOTE: Standard and reject sizes for the main
bearings are shown in Section 12 - Engine
Specifications.
Check Camshaft Bearings
The camshaft is supported by machined
bearings which are not serviceable. Check
camshaft bearings with Plug Gauge #19164. If
gauge can be inserted 1/4” (6.4 mm) or more,