N14 Base Engine Troubleshooting and Repair Manual – 020-024   Engine Brake

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.

• Disconnect the battery cables (negative [-] cable first) before removing or installing the engine brakes.

CAUTION  Do not use solvent to clean the rocker lever cover gasket. Solvent will damage the o-ring material and cause it to swell.

• The rocker lever cover gasket can be used again if it is
  not damaged. Do
  not discard the gasket.

• Remove the crankcase breather tube.
  Refer to Procedure 003-001 (Crankcase Breather Tube) in Section 3.

• Remove the rocker lever cover and rocker lever cover gaskets.
  Refer to Procedure 003-011 (Rocker Lever Cover) in Section 3.

Disconnect the engine brake harness wire from the electrical connector on each engine brake housing.

Remove the capscrews and washers from each engine brake housing.

Remove the engine brake housing.

Remove the engine brake housing gasket.

Use an approved solvent to clean the housing, and dry with compressed air.

Inspect the housing for any missing or damaged parts.

Apply a thin film of clean 15W-40 oil to the machined surfaces.

Install new engine brake housing gaskets and the engine brake housings.

Install the engine brake housing washers and capscrews. Tighten the capscrews in the sequence shown to the torque value listed below.

Connect the brake harness wire to the electrical connector on each brake housing.

Adjust the engine brakes. Consult the adjust step in this procedure.

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.

• The rocker lever cover gasket can be used again if it is
  not damaged.
• Install the reusable rocker lever cover gaskets.
• Install the rocker lever covers.
  Refer to Procedure 003-011 (Rocker Lever Cover) in Section 3.
• Install the crankcase breather tube.
  Refer to Procedure 003-001 (Crankcase Breather, Tube) in Section 3.
• Connect the battery cables (negative [-] cable first).

NOTE: The dial indicator method can
not be used if the adjusting screw has a screwdriver slot. In that case, the feeler gauge method will have to be used.

The dial indicator method is the
only approved procedure for brake lash adjustment. Studies have determined that adjustments made with a feeler gauge are significantly less accurate than those made with an indicator. Excessive lash can overload the engine’s injection train and can result in engine damage.

To maintain a very high level of brake performance on the N14 Plus engine while operating within the valve and injection train capabilities, it is recommended to adjust brake lash with a dial indicator.

Engine brake adjustment specifications are found on the engine brake dataplate (1) located on the exhaust side of the engine brake housing.

If the engine is equipped with an engine brake, use the following adjustment procedure.

Slave piston adjustment
must be made with the engine stopped and cold (stabilized water temperature at 60°C [140°F] or below). The exhaust valves on the cylinder which are to be adjusted
must be in the closed position.

Rotate the crankshaft in the direction of engine rotation. Align the “A” or “1-6VS” mark on the accessory drive pulley with the pointer on the gear cover.

When the “A” or “1-6VS” mark is aligned, the intake and exhaust valve rocker levers
must be loose for cylinder number 5.

Both the intake and exhaust valves are closed when both rocker levers are loose and can be moved from side to side. If both valves are
not closed, rotate the accessory drive one complete revolution; and align the “A” mark with the pointer again.

If the valve rocker lever adjusting screws have been loosened and
not yet adjusted, watch the valve push tubes as the engine rolls upon the “A” mark. Both valve push tubes will have moved to the downward (valve closed) position if the engine is on the correct stroke.

The instructions using the “A” or “1-6VS” mark to begin the adjustments are for illustration purposes. Adjustments can start at any of the cylinders as shown.

Loosen the locknut for the number 5 slave piston adjusting screw.

Install a dial indicator, Part Number 3375006, over the number 5 slave piston adjusting screw. Use the adapter, Part Number 3823826, to mount the dial indicator fixture to the engine brake.

Engine brake slave piston lash can
not be set within the +/- .051 mm [.002 in] tolerance with a feeler gauge.

Exceeding the tolerance limits will result in low brake power, or possible exhaust valve/piston interference when set on the low side or excessive component loading, which could lead to failure, when set on the high side.

Engine brake slave piston lash
must be set using the dial indicator method.

Tighten the adjusting screw until the slave piston contacts the crosshead.

Zero the gauge with the dial indicator stem resting on the adjusting screw.

NOTE: Engine brake adjustment specifications are found on the engine brake dataplate (1) located on the exhaust side of the engine brake housing.

Loosen the adjusting screw until the indicator needle shows 0.58 mm [0.023 in].

Hold the adjusting screw and tighten the lock nut.

Repeat this procedure to adjust the remaining slave pistons.