HEAD 9T6863 - Caterpillar

Timing Check
Illustration 1 g01336050
Location of timing pin (typical example)
(1) Timing hole
(2) Timing pin
Illustration 2 g01336118
(3) Lifting bracket
(4) Bolts
Remove bolts (4). Remove lifting bracket (3).
Find the top center position for the number one piston. Refer to Testing and Adjusting, "Finding the Top Center Position for the No. 1 Piston". Note: When the timing bolt is installed in the flywheel, it is not necessary to remove the No. 1 valve cover in order to find the compression stroke.
Illustration 3 g01336520
(5) "RR" Marking
When the timing bolt is installed in the flywheel, insert camshaft timing pin (2) into timing hole (1). If timing pin (1) can not be installed, the flywheel must be turned by 360 degrees in order to put the No. 1 piston on the compression stroke. Camshaft timing pin (2) must be installed so that the "RR" marking (5) is facing the rear of the engine.Camshaft timing pin (2) is fully installed when the bottom of the plug is flush with the top face of the cylinder block.
If camshaft timing pin (2) does not engage in the groove of the camshaft, the engine is not in time. The camshaft must be adjusted. Refer to "Timing Adjustment" 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
Table 1
Required Tools
Tool Part Number Part Description Qty
A 282-9962 Guide 2
B 255-2820 Camshaft Pilot 2
C 8T-3169 Crank As 1 Note: The timing must be checked before the timing adjustments are made. Refer to "Timing Check" for this 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 4 g01336288
(6) Harness assemblies
(7) Bolts
(8) Cover
(9) Cover
(10) Bolts
Remove harness assemblies (6), bolts (7), bolts (10), cover (8), and cover (9).
Illustration 5 g01336433
(11) Camshaft gear
(12) Spacer
(13) Bolts
(14) Bolt
Remove bolts (13), bolt (14), spacer (12), and camshaft gear (11).
Illustration 6 g01336483
Apply a thin coat of oil to Tooling (A) and Tooling (B). Install Tooling (A) and leave the bolts loose. Install Tooling (B). Tighten the bolts for Tooling (A). Install Tooling (C). Use Tooling (C) in order to rotate the camshaft.
Rotate the camshaft in the direction of engine rotation until camshaft timing pin (2) can be installed in timing hole (1). Camshaft timing pin (2) must be installed so that the "RR" marking (5) is facing the rear of the engine.Camshaft timing pin (2) is fully installed when the bottom of the plug is flush with the top face of the cylinder block.
Install camshaft gear (11). Install spacer (12). Install bolt (14). Install bolts (13).
Install cover (8), cover (9), bolts (7), bolts (10), and harness assemblies (6).
Install camshaft timing pin into the storage location.
Install lifting bracket (3) and bolts (4).