20195 1 Mercruiser O-RING, (.487 x .103)

Table 1
Needed Tools
A 5P-7306 Housing As (Starter Turning Tool)
B 5P-7305 Engine Turning Tool (Starter Turning Tool)
C 136-4632 Timing Pin (Starter Turning Tool)
D 208-9388 Adapter (If needed) Caterpillar Channel 1 VideosFor supplemental information on this procedure, refer to the following video. The previous training has been replaced with the video below.Note: A CWS login is required to access Caterpillar Channel 1. Scan the QR code below with a QR enabled device or copy the link that follows.
Illustration 1 g06318440https://channel1.mediaspace.kaltura.com/media/Finding+Top+Center+for+C15+and+C18+Tier+4+Final+Engines++No.+1+Piston/1_7pp7xh5o
The No. 1 piston at top center (TC) on the compression stroke is the starting point of all timing procedures.The camshaft gear will be off a half tooth if the engine is timed when Cylinder # 6 is at Top Dead Center (TDC). The engine MUST be timed when Cylinder #1 is at Top Dead Center (TDC). Do NOT time the engine with Cylinder #6 at TDC as the camshaft gear will be off a half tooth.Note: Some engines have two threaded holes in the flywheel. These holes are in alignment with the holes with plugs in the left and right front of the flywheel housing. The two holes in the flywheel are at a different distance from the center of the flywheel so the timing bolt cannot be put in the wrong hole.
Illustration 2 g00294875
Timing bolt location on left side of engine
(1) Timing bolt
(2) Timing bolt location
(3) Cover
Illustration 3 g00294876
Timing bolt location on right side of engine
(4) Timing bolt location.
Timing bolt (1) is a cover bolt. The timing bolt can be installed in either the left side of the engine at location (2) or in the right side of the engine at timing bolt location (4). Remove both bolts (1) and cover (3) from the flywheel housing. Remove the plug from the timing hole in the flywheel housing.
Put timing bolt (1) (long bolt that holds the cover on the flywheel housing) through the timing hole in the flywheel housing. The 9S-9082 Engine Turning Tool and a 1/2 inch drive ratchet wrench are used to turn the engine flywheel in the direction of normal engine rotation. Normal engine rotation is counterclockwise. Normal engine rotation is viewed from the flywheel end of the engine. Turn the engine flywheel until the timing bolt engages with the threaded hole in the flywheel.
Illustration 4 g00294877
(1) Timing bolt
(5) 9S-9082 Engine Turning ToolNote: If the flywheel is turned beyond the point of engagement, the flywheel must be turned in the opposite direction of normal engine rotation approximately 45 degrees. Then turn the flywheel in the direction of normal rotation until the timing bolt engages with the threaded hole. The procedure will eliminate the backlash that will occur when the No. 1 piston is put on the top center.
Remove the front valve mechanism cover from the engine.
The inlet and exhaust valves for the No. 1 cylinder are fully closed if the 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.Note: After the actual stroke position is identified, and the other stroke position is needed, remove the timing bolt from the flywheel. The flywheel is turned 360 degrees in a counterclockwise direction. The timing bolt is reinstalled.