5033339 JOHNSON *SEAL, OIL

Engine Prelubrication
Always prelube the engine when you rotate the crankshaft.The switch for the engine prelube is on the remote control panel. The switch enables manual lubrication of the engine.DO NOT use the starting motor to rotate the crankshaft. If the crankshaft is rotated too fast, lubrication with the prelube pump is not sufficient for protecting the engine.Use the manual barring group to rotate the crankshaft for service work. Keep the prelube pump running when the crankshaft is rotated. Damage can result if the crankshaft is rotated on dry bearing surfaces.
In order to avoid possible damage to the engine, the prelube pump should not be operated continuously for extended periods of time. During repairs, if the prelube pump has run for more than three hours continuously, any oil that may have collected in the cylinders and/or above the valves should be removed before attempting to start the engine.
Finding the Top Center Compression Position for the No. 1 Cylinder
Illustration 1 g00311103
(1) Barring device
(2) Storage position for the timing pin
Remove the timing pin from storage position (2) that is located below barring device (1).
Illustration 2 g00311105
Installation of the timing pin
(3) Timing bracket
(4) Mounting bracket for the timing pin
(5) Timing pin
Operate the prelube pump. Use the barring device to turn the flywheel in the direction of normal engine rotation. Turn the flywheel until timing pin (5) can be installed through bracket (4) into timing bracket (3).Note: If the flywheel is turned beyond the point of installation in timing bracket (3), the play must be removed from the timing gears. Turn the flywheel in the opposite direction of normal rotation for approximately 20 degrees. Then turn the flywheel in the direction of normal engine rotation until the timing pin can be installed.
Remove the valve cover from the No. 1 cylinder head.
The inlet and exhaust valves for the No. 1 cylinder are fully closed if No. 1 piston is on the compression stroke and the rocker arms can be moved by hand. If the rocker arms cannot be moved and the valves are slightly open, the No. 1 piston is on the exhaust stroke. For the cylinders to service according to the corresponding crankshaft position, refer to "Crankshaft Positions for Valve Lash Setting".Note: When the actual stroke position is identified and the other stroke position is needed, remove the timing pins from the engine. Turn the flywheel for 360 degrees in the direction of normal engine rotation.Crankshaft Positions for Valve Lash Setting
Illustration 3 g00283190
G3606 Engine cylinder and valve location
(A) Inlet valve
(B) Gas admission valve
(C) Exhaust valve
Table 1
Crankshaft Positions for Valve Lash Setting
Standard Counterclockwise Rotation (1)
G3606
Engine Inlet Valves Exhaust Valves Gas Admission Valves
TC Compression Stroke 1-2-4 1-3-5 1-4-5
TC Exhaust Stroke 3-5-6 2-4-6 2-3-6
Firing Order 1-5-3-6-2-4
(1) Put the No. 1 piston at the Top Center position (TC). Ensure the identification for the correct stroke. Refer to "Finding the Top Center Compression Position for the No. 1 Cylinder". After adjustments for the correct cylinders, remove the timing pin. Operate the prelube pump and turn the flywheel for 360 degrees in the direction of normal rotation. The rotation will put the No. 1 piston at the TC position on the opposite stroke. Install the timing pin in the crankshaft and complete the adjustments for the cylinders that remain.
Illustration 4 g00465539
G3608 Engine cylinder and valve location
(A) Inlet valve
(B) Gas admission valve
(C) Exhaust valve
Table 2
Crankshaft Positions for Valve Lash Setting
Standard Counterclockwise Rotation (1)
G3608
Engine Inlet Valves Exhaust Valves Gas Admission Valves
TC Compression Stroke 1-4-6-7 1-2-4-6