Clearing A Lodged Impeller; Engine Break-In Procedure; Starting The Engine - Mercury Jet 40 Manual

Clearing A Lodged Impeller

If the flywheel is rotated to free a lodged impeller, there is the possibility that the engine will crank over and start.
To prevent this type of accidental engine starting and possible serious injury, always turn the ignition key or
lanyard stop switch to the "OFF" position and remove all spark plug leads from the spark plugs.
It is possible for debris to lodge between the impeller and jet housing wall, especially after the engine has been
stopped. This will lock the driveshaft and will prevent the engine from being able to crank over for starting. Following
are steps for dislodging the impeller.
1. Position lanyard stop switch to the "OFF" position.
2. Remove spark plug leads to prevent the engine from accidentally starting.
3. Remove flywheel or rewind cover and rotate the engine flywheel counterclockwise.
If this does not dislodge the impeller, it will be necessary to remove the six screws and water intake housing.

Engine Break-in Procedure

Severe damage to the engine can result by not complying with the Engine Break-in Procedure.
ENGINE BREAK-IN FUEL MIXTURE
Use a 50:1 (2%) gasoline/oil mixture in the first tank of fuel. Refer to the following table for mixing ratios. Use of
this fuel mixture combined with oil from the oil injection system will supply adequate lubrication during engine
break-in.
BREAK-IN PROCEDURE
Vary the throttle setting during the first hour of operation. During the first hour of operation, avoid remaining at a
constant speed for more than two minutes and avoid sustained wide open throttle.

Starting The Engine

Before starting, read the Pre-Starting Check List, Special Operating Instructions, and Engine Break-in Procedure
in the Operation section.
Never start or operate your outboard (even momentarily) without water circulating through all the cooling water
intake holes in the gearcase to prevent damage to the water pump (running dry) or overheating of the engine.
1. Ensure the driveshaft bearing on the jet drive is lubricated. Refer to Maintenance - Lubrication Points.
2. Open fuel tank vent screw (in filler cap) on manual venting type fuel tanks.
OPERATION
WARNING
!
CAUTION
!
CAUTION
!
32
ob01394