5.3.4. Clean the cooling air system
Before cleaning, the engine must be
stopped and allowed to cool down.
Remove parts of air duct.
Dry contamination
– Clean all air guide elements and the complete
cooling air zones on the cylinder head, cylin-
der and flywheel blades without making them
wet. Blow them dry with compressed air.
Persons handling compressed air must
wear protective goggles.
Moist or oily contamination
– Disconnect the battery. Clean the complete
area with a solvent, cold cleaner etc. according
to its manufacturer’s instructions, then spray
down with a powerful water jet.
Do not splash electrical device with water jet
or pressure jet during engine cleaning.
– Trace the cause of any contamination with oil
and have the leak eliminated by a HATZ
service station.
– Install the air guide elements previously re-
moved.
The engine must never be run without
the air guide elements in position.
– Immediately after re-assembly, run the engine
until warm to prevent residual moisture from
causing rust.
5.3.5. Checking threaded connections
Check the condition and tightness of all threaded
connections, wiring, hose clips and other com-
ponents attached to the engine and its mount-
ings, provided that these can be reached during
maintenance work.
Do not tighten the cylinder head bolts.
40
Adjustment screws on speed governor
and injection system are painted with
safty lacquer. Do not tighten or adjust them.
5.3.6. Cleaning mesh insert in exhaust
silencer
(additional equipment)
41
– Remove deposits from the mesh insert with a
suitable wire brush.
2396 / 3
26
