3.34
ENGINE
CRANKCASE OIL PASSAGES & PRESSURE
RELIEF VALVE
1. Remove the pressure relief valve assembly from the
case.
2. Clean all crankcase oil passages with a stream of
clean solvent.
CAMSHAFT CHAIN
1. Replace the cam chain as part of any crankshaft
repair.
2. The cam chain can be removed by removing the
engine top end, the recoil assembly, flywheel and
flywheel key, stator plate, and slotted nut.
3. Lift the sprocket slightly until chain clears the
crankcase to remove.
BALANCE SHAFT BEARING INSPECTION
NOTE: Replace all seals whenever the crankcase is
disassembled.
1. Inspect the balance shaft bearings in the crankcase.
NOTE: Due to extremely close tolerances and minimal
movement, the bearing must be inspected visually and by
feel. Look for signs of discoloration, scoring or galling.
Turn the inner race of bearing. The bearing should turn
smoothly and quietly. The outer race should fit tightly in
the crankcase. The inner race should be firm with minimal
side to side movement and no detectable up and down
movement.
2. To remove balance shaft bearings, use a blind hole
bearing puller.
NOTE: Bearings are stressed during the removal
procedure and should not be re-used.
CRANKCASE OIL PICKUP STRAINER
INSPECTION
1. Pull the strainer screen (A) from the case carefully and
clean or replace it if heavily clogged, or if damaged.
BEARING /SEAL INSTALLATION
NOTE: To ease crankcase bearing installation, warm the
crankcase until hot to the touch. Placing the bearing in a
freezer prior to installation will assist the assembly
process.
1. Install the bearing so the numbers are visible.
2. Drive or press the new bearing into the crankcase,
using the proper driver.
3. Install new seals with the lip facing in.
ote: Install new chain as a part of crankshaft rep
CAUTION
Press only on outer race of bearing to prevent bear-
ing damage.
CAUTION
Press only on outer diameter to prevent damage.
A
To Next Page
Loading...
Need help?
General
