196
POWERHEAD
COMPRESSION TESTING
COMPRESSION TESTING
Start and run outboard until it achieves operating
temperature, then shut OFF.
Disconnect crankshaft position sensor (CPS) con-
nector. Remove all spark plugs.
Advance throttle linkage to WOT.
Install compression tester’s hose attachment into
spark plug hole (14 mm threads).
While cranking outboard with starter, note maxi-
mum pressure reading on gauge. Repeat proce-
dure for each cylinder.
If engine shows a variation greater than 15 psi
(100 kPa) between cylinders, check for:
• damaged cylinder head
• damaged pistons
• broken or stuck piston rings
• scored cylinder walls
Return throttle to idle position and reconnect CPS
connector. Replace spark plugs. Refer to Spark
Plug Indexing on p. 38.
POWERHEAD REMOVAL
Remove lower motor covers. Refer to Lower
Cover Removal on p. 49.
Remove flywheel cover and rear shroud.
Remove air temperature sensor from air silencer.
Remove the air silencer.
WARNING
Protect against hazardous fuel spray.
Before starting any fuel system service,
carefully relieve fuel system pressure.
Refer to Relieving Fuel System Pressure
on p. 146.
To prevent accidental starting while ser-
vicing, twist and remove spark plug leads.
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