100
Have the engine model number and serial number avail-
able when ordering parts. Record the engine model and
serial numbers and store them for future reference in case
the identification plate on the engine is defaced or lost.
REPLACEMENT PARTS
When installing new parts on the engine, make sure the
part is designed for use on a marine engine. Automotive
and marine engine parts may look similar; however, auto-
motive parts may not be capable
of
operating in a harsh
marine environment.
Use only Yanmar parts or parts approved for use on ma-
nne
engmes.
ENGINE
Precautions
Some service procedures can be performed with the en-
gine in the boat; others require removal. The boat design
and service procedure to be performed determines
whether the engine must be removed.
WARNING
The engine is heavy, awkward to handle and
has sharp edges. It may shift or drop sud-
denly during removal. Topreventserious in-
jury, always observe the following
precautions.
1. Never place any part of your body where a moving or
falling engine may trap, cut or crush you.
2.
If
you must push the engine during removal, use a
board or similar tool to keep your hands out
of
danger.
3. Be sure the hoist is designed to lift engines and has
enough load capacity for the engine.
4. Be sure the hoist is securely attached to safe lifting
points on the engine.
5. The engine should not be difficult to lift with a proper
hoist.
If
it is, stop lifting, lower the engine back onto its
mounts and make sure the engine has been completely
separated from the vessel.
Removal/Installation
While specific procedures cannot address all engine in-
stallations, refer to the following general instructions
when removing the engine:
1.Detach the negative battery cable from the negative bat-
tery terminal.
2. Close the seacock. Drain the cooling system, including
CHAPTER
SIX
the freshwater system,
if
so equipped, as described in
Chapter Four.
3. Disconnect the intake water hose from the seawater
cooling pump.
4. Close the fuel shutoffvalve and disconnect the fuel line
and the fuel return line.
5. Disconnect the remote control cables.
6. Disconnect the electrical wiring harness connectors.
7. Disconnect the electrical wires from the electric starter
motor and solenoid that will interfere with engine
removal.
8. Detach the exhaust system.
9. Detach the driveshaft from the transmission output
flange.
10. Remove the engine retaining bolts.
11. Remove the engine and transmission.
12.Remove the transmission from the engine as described
in Chapter Ten or Eleven.
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