GASKET-DIAPHRAGM 1244129 - Caterpillar

Removal Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 230-6284 Timing Pin (Camshaft) 1
B 136-4632 Timing Pin (Crankshaft) 1
268-1966 Adapter 1
C 298-5564 T40 Torx Socket 1 Start By:
Remove the front cover. Refer to Disassembly and Assembly, "Front Cover - Remove and Install" for the correct procedure.
Remove the valve mechanism cover. Refer to Disassembly and Assembly, "Valve Mechanism Cover - Remove and Install" for the correct procedure. Note: Care must be taken in order to ensure that the fuel injection pump timing is not lost during the removal of the idler gear. Carefully follow the procedure in order to remove the fuel pump gear.
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Illustration 1 g01994555
Illustration 2 g03414038
Remove plug (2) from the cylinder block and remove O-ring seal (1) from the plug.
Rotate the crankshaft so that number one piston is at top dead center on the compression stroke. Refer to System Operation, Testing and Adjusting, "Finding Top Center Position for No.1 Piston" for the correct procedure.
Install Tooling (B) into Hole (Y) in the cylinder block. Use Tooling (B) in order to lock the crankshaft in the correct position. Note: Do not use excessive force to install Tooling (B). Do not use Tooling (B) to hold the crankshaft during repairs.
Install Tooling (A) into Hole (X) in camshaft gear (3). Use Tooling (A) in order to lock the camshaft in the correct position.
Mark gear (3), gear (4), and gear (5) in order to show alignment. Refer to Illustration 2.
Illustration 3 g03378317
Loosen nuts (7) on all rocker arms (8). Use Tooling (C) in order to loosen adjusters (6) on all rocker arms (8). Unscrew adjusters (6) on all rocker arms (8) until all valves are fully closed. Note: Failure to ensure that ALL adjusters are fully unscrewed can result in contact between the valves and pistons.
Illustration 4 g03414039
Illustration 5 g03414044
Mark plate (9) in order to show orientation. Note: Identification will ensure that the plate can be installed in the original orientation.
Remove bolts (10).
Remove plate (9).
Remove the assembly of idler gear (3).
Remove hub (11) from idler gear (3).