Oil Seal Replacement — Valve Oil Seal

EM-212prose procedure

CD17 and CD20 diesel engines; valve oil seal cross-section dimensions differ between CD17 and CD20.

VALVE OIL SEAL

1
Remove both timing belts.
SEM888
2
Remove camshaft sprockets and back covers.
3
Remove camshaft brackets by loosening bracket nuts from center to outside in two or three stages.
4
Remove camshaft oil seals and camshaft.
5
Remove valve lifters and mark order No. on each lifter.
SEM238D
6
Replace valve oil seal according to the following procedure. When replacing valve oil seal, set the corresponding piston at T.D.C. Failure to do so causes the valve to drop into the cylinder.
When replacing valve oil seal, set the corresponding piston at T.D.C. Failure to do so causes the valve to drop into the cylinder.
6-1
Set No. 1 cylinder at T.D.C.
6-2
Remove valve springs and valve oil seals for No. 1 and No. 4 cylinders. Valve spring seats should not be removed.
6-3
Install new valve oil seals for No. 1 and No. 4 cylinders as illustrated. Reinstall valve springs. (narrow pitch side toward cylinder head)
SEM239D
6-4
Install valve spring retainers on intake valves and valve rotators on exhaust valves, and remount valve assembly.
6-5
Set No. 2 cylinder at T.D.C.
6-6
Replace valve oil seals for No. 2 and No. 3 cylinders according to steps 2) and 3).
6-7
Install valve lifters in original positions.

CAUTION

When installing camshaft and crankshaft oil seals, be careful to install them correctly, as shown in the figure.

Apply engine oil to oil seal lip, outer face, camshaft and bracket.

Wipe off excess oil after installing oil seal.