HOUSING AS-FRONT 3501638 - Caterpillar

Illustration 2 g00618922
Use Tooling (A) to compress valve spring (1).
Remove retainer lock (2).
Release the tension on Tooling (A). Remove Tooling (A).
Remove valve rotator (3), outer spring (5), inner spring (4), and seal (6). Note: If the valves will be reused, mark the valves for identification upon assembly.
Remove valve (7) from the cylinder head.
Use Tooling (B) to measure the force of the valve springs. Refer to Specifications for the correct spring force.
Repeat Steps 1 through 6 for the remaining valves. Bridge Dowels
Table 2
Required Tools
Tool Part Number Part Description Qty
C 5P-0944 Dowel Puller Group 1
5P-0942 Dowel Extractor 1
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Illustration 3 g01051069
If the bridge dowels will be replaced, use Tooling (C) to remove bridge dowel (8) from the cylinder head. Inlet and Exhaust Valve Seat Inserts
Table 3
Required Tools
Tool Part Number Part Description Qty
D 166-7441 Valve Seat Extractor Tool 1
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Use Tooling (D) to remove the valve seat inserts from the cylinder head.
Thoroughly clean valve seat bores in the cylinder head. Inlet and Exhaust Valve Guides
Table 4
Required Tools
Tool Part Number Part Description Qty
E 7M-3975 Valve Guide Driver 1
5P-1729 Valve Guide Bushing 1
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Use Tooling (E) and a hammer to remove the valve guides from the cylinder head. Valve Lifters
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Note: The valve lifters may also be removed with the cylinder head on the engine. Remove the camshaft and use the following steps in order to remove the valve lifters with the cylinder head on the engine.
Illustration 4 g01051072
Illustration 5 g01051073
Personal injury can result from being struck by parts propelled by a released spring force.Make sure to wear all necessary protective equipment.Follow the recommended procedure and use all recommended tooling to release the spring force.
Pull valve lifter (9) out of the cylinder head.
Remove guide spring (10) from the valve lifter.