ISC, ISCe, QSC8.3, ISL, ISLe3, ISLe4 and QSL9 Engines – 003-008   Rocker Lever

Preparatory Steps

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 WARNING 

Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

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Remove

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Remove the capscrews from the rocker lever pedestals.

Remove and mark the pedestals and rocker lever assemblies one at a time as to their location and position.

Remove and mark the crossheads one at a time as to their location and position. The crossheads and rocker assemblies must be installed in their original location and position.

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Clean and Inspect for Reuse

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Clean all parts in a strong solution of laundry detergent in hot water.

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 WARNING 

Wear appropriate eye and face protection when using compressed air. Flying debris and dirt can cause personal injury.

Use compressed air to dry the parts after rinsing in clean hot water.

The pedestals are made from powdered metal and will continue to show wetness after they have been cleaned and dried.

Be sure oil drillings in the rocker arms and shafts are unobstructed.

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Inspect for cracks and excessive wear in the bore.

The socket should move freely on the rocker lever and the plastic socket retainer should be in place and not cracked.

Inspect for wear on the nose of the socket.

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Measure the rocker lever bore.

Rocker Lever Bore

mm in
24.987 MIN 0.984
25.013 MAX 0.985

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Inspect the rocker lever pedestal and rocker lever shaft for cracks.

Measure the rocker lever shaft diameter.

Rocker Lever Shaft

mm in
24.950 MIN 0.982
24.962 MAX 0.983

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Install

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Without Engine Brakes


Different combinations of the adjusting screw, rocker lever shaft, rocker lever, and push rod can exist. Make sure when replacing rocker levers or adjusting screws that the correct part is being used.

Refer to Procedure 004-014 in Section 4.

 
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Position the rocker levers on the rocker pedestal.

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Install the intake crossheads in their original location and position.

Install the exhaust crossheads in their original location and position.

Install the rocker lever assemblies and pedestals in their original locations.

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Lubricate the capscrew threads with clean engine oil.

Install and tighten the pedestal capscrews.

Torque Value:  65  n.m  [48 ft-lb]

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With Engine Brakes


Different combinations of the adjusting screw, rocker lever shaft, rocker lever, and push rod can exist. Make sure when replacing rocker levers or adjusting screws that the correct part is being used.

Refer to Procedure 004-014 in Section 4.

 
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Position the rocker levers on the rocker pedestal.

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Install the crossheads in their original location and position.

Install the engine brake compatible exhaust crossheads with the pin facing the exhaust manifold.

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Install the rocker lever assemblies and pedestals in their original location.

Make sure the exhaust rocker levers have the longer adjusting screw locknut installed.

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Lubricate the capscrew threads with clean engine oil.

Install the engine brake oil supply capscrews on intake rocker levers 1 and 4.

Torque Value:  65  n.m  [48 ft-lb]

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Lubricate the capscrew threads with clean engine oil.

Install the exhaust rocker lever capscrews into all exhaust levers.

Torque Value:  65  n.m  [48 ft-lb]

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Lubricate the capscrew threads with clean engine oil.

Install the pedestal capscrews in cylinders 2, 3, 5, and 6 intake rocker pedestals.

Torque Value:  65  n.m  [48 ft-lb]

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Lubricate the capscrew threads with clean engine oil.

Install the six threaded spacers into the cylinder head.

Torque Value:  24  n.m  [212 in-lb]

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Finishing Steps

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 WARNING 

Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

SMALL | MEDIUM | LARGE
Last Modified:  19-Oct-2009