91306-ZV5-821 Honda O-RING (Honda Code 4594826).

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.
Introduction
This procedure is performed as a precursor to checking the engine valve lash and adjusting the fuel injector rocker arms.Required Tools
Table 1
Required Tools
Item Quantity Part Number Part Name
T1 1 214-7340 Ratchet Wrench Gp
T2 1 9S-9082 Engine Turning Tool (Turning Port Tool)
T3 1 5P-7305(1) Engine Turning Tool(Starter Turning Tool)
T4 1 5P-7306(1) Housing As (Starter Turning Tool)
T5 1 208-0888(1) Engine Turning Tool (Turning Port Tool)
T6 1 136-4632 Timing Pin
T7 1 139-7063 Timing Pin Adapter
T8 1 139-7064 Timing Pin Adapter
(1) Used in applications where extra hole is not provided in flywheel housing to accommodate engine turning toolTest Preparation
Remove the appropriate engine covers that allow access to the turning tool cover plate on the flywheel. Remove the turning tool cover plate and the timing pin hole plug (2). Remove the valve cover from the engine.Test Procedures
Illustration 1 g01713799
Typical view of flywheel housing
(1) Flywheel Housing
(2) Timing Pin Hole Plug
(3) Cover Bolt
(4) Cover
Thread the 136-4632 Timing Pin with the proper timing pin adapter into the timing hole. The timing hole is located approximately 127 to 152 mm (5.0 to 6.0 inch) above the hole for the engine turning tool in the flywheel housing.
Illustration 2 g02614960
Typical location for engine turning tool for flywheel housings with extra hole
Illustration 3 g02614999
Typical location for engine turning tool for flywheel housings without extra hole
Note: Never turn the engine by the crankshaft vibration damper. The crankshaft vibration damper is a precision part. Damage to the crankshaft vibration damper can result in major engine failure.
Install the proper engine turning tool into the proper location on the flywheel housing. Turn the flywheel in the direction of engine rotation. The direction of engine rotation is counterclockwise, as the engine is viewed from the flywheel end. Turn the flywheel until the timing pin engages with the hole in the flywheel.Note: If the flywheel is turned beyond the point of engagement, the flywheel must be turned in the direction that is reverse of normal engine rotation. Turn the flywheel by approximately 30 degrees. Then turn the flywheel in the direction of normal rotation until the timing pin engages with the hole in the flywheel. This procedure removes the play from the gears when the number 1 piston is at the top center position.
Remove the valve mechanism cover from the engine.
The inlet and exhaust valves for the number 1 cylinder are fully closed if the number 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 number 1 piston is on the exhaust stroke.Note: When the actual stroke position is identified, and the other stroke position is needed, remove the timing pin from the hole in the flywheel. Then turn the flywheel by 360 degrees in the direction of normal engine rotation and reinstall the timing pin into the hole in the flywheel.