0398901 JOHNSON BRG AY-THRUST

Accidental engine starting can cause injury or death to personnel working on the equipment.To avoid accidental engine starting, disconnect the battery cable from the negative (−) battery terminal. Completely tape all metal surfaces of the disconnected battery cable end in order to prevent contact with other metal surfaces which could activate the engine electrical system.Place a Do Not Operate tag at the Start/Stop switch location to inform personnel that the equipment is being worked on.
Specifications
Table 1
Parameter Value
Camshaft Gear Bolt Torque 360 N m (265 lb ft) plus 90 degrees References
Reference: Testing and Adjusting, "Finding the Top Center Position for the No. 1 Piston".Reference: Testing and Adjusting, "Valve Lash - Adjust" .Introduction
Use the procedures below to perform a timing check and timing adjustment.Required Tools
Table 2
Item Qty Part Number Part Name
T1 1 9S-9082 Engine Turning Tool
T2 1 6V-3010 Puller Group
T3 2 8S-9089 Bolts
T4 2 5P-1076 Hard Washers Timing Check Preparation
Turn off the engine.
Illustration 1 g00793695
Location of timing pins
(1) Timing hole
(2) Timing pin
Remove the rear camshaft covers from both sides of the engine.Timing Check Procedure
Refer to Testing and Adjusting, "Finding the Top Center Position for the No. 1 Piston".Note: When the timing bolt is installed, it is not necessary to remove the No. 1 valve cover to find the compression stroke. Both of the rear camshaft covers must be removed to check the timing.
When the timing bolt is installed in the flywheel, look at the rear end of the camshaft. If the timing groove is visible, then the No. 1 piston is on the compression stroke. If the timing groove is not visible, then feel the back of the camshaft for the groove. If the groove is at the back of the camshaft, the flywheel must be turned by 360 degrees. Turning the flywheel for 360 degrees will put the No. 1 piston on the compression stroke.
Illustration 2 g00793673
Installation of timing pins
(2) Timing pin
(3) RH Camshaft
Remove timing pins (2) from the storage positions after the timing bolt is installed in the flywheel. The engine must be on the No. 1 piston compression stroke.
Install timing pins (2) through timing holes (1) in the engine block. Install timing pins (2) into the groove in camshaft (3) on each side of the engine. To time the engine correctly, the timing pins must fit into the groove of each camshaft.
If timing pins (2) do not engage in the grooves of both camshafts, the engine is not in time. One camshaft or both camshafts must be adjusted.
Both camshafts are adjusted in the same manner. Refer to "Timing Adjustment Procedure" for the procedure to put the camshafts in time with the crankshaft.
If a camshaft is out of time more than 18 degrees (approximately 1/2 the diameter of timing pin out of groove), the valves can make contact with the pistons. This will cause damage that will make engine repair necessary.
Timing Adjustment Procedure
Note: The timing must be checked before the timing adjustments are made. Refer to "Timing Check Procedure" for the procedure.After the Timing Check procedure is complete, the timing bolt will be engaged in the flywheel. The No. 1 piston will be at the top center (TC) position.
Illustration 3 g06326098
Rocker shafts
(1) Bolt
(2) Rocker shaft
Illustration 4 g00284804
Camshaft drive gears (RH side)
(3) Drive gear
(4) Plate
(5) Bolt
Remove all the valve covers on the side for the camshaft adjustment. Loosen bolts (1) that hold rocker shafts (2) to the valve cover bases until all rocker arms are free from the valves.Note: The above procedure must be done before camshaft drive gear (3) is pulled off the camshaft taper.
Remove the covers from the flywheel hou