218
POWERHEAD
TAPER PIN TOOL
TAPER PIN TOOL
COMPRESSION TESTING
Start and run outboard until it achieves o perating
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 outbo ard with st arter, note maxi-
mum pressure reading on gauge. Repeat proce-
dure for each cylinder.
If engine sh ows 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. Rep lace sp ark plugs. Refer to S park
Plug Indexing on p. 40.
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