ISC, ISCe, QSC8.3, ISL, ISLe3, ISLe4 and QSL9 Engines - 003-004 Overhead Set

Preparatory Steps
Adjust
Finishing Steps

Preparatory Steps

TOC

Remove the following:

Crankcase breather tube and drain tube, external crankcase breather only. Refer to Procedure 003-018 in Section 3.
Plastic fuel pump drive cover located on the front of the engine.
Rocker lever cover and gasket. Refer to Procedure 003-011 (Rocker Lever Cover) in Section 3.
Engine brake assembly, if equipped. Refer to Procedure 020-004 in Section 20.

SMALL | MEDIUM | LARGE

Adjust

TOC

CAUTION

Engine coolant temperature should be less than 60°C [140°F].

Use barring tool, Part Number 3824591, or equivalnt. Rotate the crankshaft to align the top dead center marks on the gear cover and the fuel pump gear.

SMALL | MEDIUM | LARGE

With the engine in this position, lash can be checked on the following rocker arms: 1I, 1E, 2I, 3E, 4I, and 5E.

Lash Check Limits


	mm		in
Intake	0.152	MIN	0.006
	0.559	MAX	0.022
Exhaust	0.381	MIN	0.015
	0.813	MAX	0.032

NOTE: Lash checks are performed as part of a troubleshooting procedure, and resetting is not required during checks as long as the lash measurements are within the above limits.

SMALL | MEDIUM | LARGE

Measure lash by inserting a feeler gauge between the crosshead and the rocker lever ball insert and socket while lifting up on the end of the rocker arm. If the lash measurement is out of specification, loosen the locknut and adjust the lash to the nominal specification.

Lash Reset Specifications


	mm		in
Intake	0.305	NOM	0.012
Exhaust	0.559	NOM	0.022

NOTE: Lash resets are only required at the interval specified in the appropriate owner’s or operation and maintenance manual when lash is measured and found out of specification, or when engine repairs cause removal of the rocker arms and/or loosening of the adjusting screws.

Tighten the locknut and measure again.

Torque Value: 24 n.m [18 ft-lb]

SMALL | MEDIUM | LARGE

Use the barring tool, Part Number 3824591, or equivalent, and rotate the crankshaft 360 degrees and measure lash for rocker arms 2E, 3I, 4E, 5I, 6I, and 6E. Reset the lash, if out of specification.		SMALL \| MEDIUM \| LARGE

Finishing Steps

TOC

Install the following:

Engine brake assembly, if equipped. Refer to Procedure 020-004 in Section 20.
Gasket and rocker lever cover. Refer to Procedure 003-011 in Section 3.
Crankcase breather tube and drain tube, external crankcase breather only. Refer to Procedure 003-018 in Section 3.
Plastic fuel pump drive cover located on the front of the engine.

Operate the engine and check for leaks.