SEAL 4990001 - Caterpillar

Illustration 1 g01255712
Typical example
Install Tooling (B) through hole (X) in camshaft gear (1) into the front housing. Use Tooling (B) in order to lock the camshaft in the correct position.
Install Tooling (C) into hole (Y) in the front housing. Use Tooling (C) in order to lock the crankshaft in the correct position. Note: Do not use excessive force to install Tooling (C). Do not use Tooling (C) to hold the crankshaft during repairs.
Illustration 2 g01350327
Typical example
Loosen nuts (6) on ALL rocker arms (7). Unscrew adjusters (5) on all rocker arms (7) 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 3 g01344527
Alignment of timing marks
Mark gears (1) and (4) in order to show alignment. Refer to Illustration 3. Note: Identification will ensure that the gears can be installed in the original alignment.
Illustration 4 g01340554
Typical example
Remove Tooling (B) and Tooling (C). Remove bolt (3) and washer (2) from camshaft gear (1).
Remove camshaft gear (1) from the camshaft. Note: If the camshaft gear is a tight fit on the nose of the camshaft, use a prybar in order to remove the camshaft gear.
If necessary, remove the key from the nose of the camshaft. Installation Procedure
Table 2
Required Tools
Tool Part Number Part Description Qty
B 230-6284 Timing Pin (Camshaft) 1
C 230-6283 Timing Pin (Crankshaft) 1
D 9U-7324 Indicator Bracket 1
7H-1942 Dial Indicator 1
3S-3268 Indicator Contact Point 1
7H-1940 Universal Attachment 1
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Ensure that number one piston is at the top center position on the compression stroke. Refer to Systems Operation, Testing and Adjusting, "Finding Top Center Position for No. 1 Piston".
Illustration 5 g01255712
Typical example
Install Tooling (C) into hole (Y) in the cylinder block. Use Tooling (C) in order to lock the crankshaft in the correct position. Refer to Systems Operation, Testing and Adjusting, "Finding Top Centre Position for No.1 Piston".
Ensure that the camshaft gear and the key are clean and free from wear or damage.
If necessary, install the key into the nose of the camshaft. Note: Ensure that the key is squarely seated.
Illustration 6 g01344527
Alignment of timing marks
Align the keyway in camshaft gear (1) with the key in the camshaft. Install the camshaft gear onto the camshaft. Ensure that the timing marks on gears (1) and (8) are in alignment and that the mesh of the gears is correct. Refer to Illustration 6.
Illustration 7 g01340554
Typical example
Install Tooling (B) through hole (X) in the camshaft gear into the front housing. Install washer (2) and bolt (3) to camshaft gear (1).
Remove Tooling (B) and (C).
Tighten bolt (3) to a torque of 95 N m (70 lb ft).
Use Tooling (D) to check the backlash for gears (1) and (8). Ensure that the backlash for the gears is within specified