ENGINE
L3301, L3901, L4701, WSM
1-S57
Measuring Angular Deviation between Crankshaft TDC and Crank Position Sensor Detected TDC
• Perform this correction every time the crank shaft or flywheel is replaced.
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Confirmation of Top Dead Center
1. Remove the rocker arm (1). (See page 1-S45.)
2. Align the #4 piston with top dead center and remove the valve
spring (2) of the #4 cylinder
3. Insert an O-ring (4) to prevent the exhaust valve (5) from falling
into the cylinder and position the dial gauge (3) at the tip of the
valve.
4. While turning the flywheel to the left, the largest deflection of the
needle on the gauge indicates top dead center, so stop the
flywheel in this position and set a tri-square (6) as shown in the
picture to the left. Mark the reference line (8) on the engine body
side and put a mark for top dead center (7) on the flywheel side.
Note, in the case the flywheel is turned too far, return it by
turning to the right and start over.
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(1) Rocker Arm
(2) Valve Spring
(3) Dial Gauge
(4) O-Ring
(5) Exhaust Valve
(6) Tri-square
(7) Mark for Top Dead Center
(8) Reference Line
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