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TROUBLESHOOTING
Valve clearance must be checked with the timing
pointer hole on the flywheel housing aligned with
the proper valve setting mark on the flywheel for
the cylinder being checked. This ensures that the
valve lifter is on the camshaft base circle and not
on the brake ramp portion of the lobe.
Wear eye protection and do not expose your
face over the engine area. Keep hands away
from moving parts. Take precautions to
prevent oil leakage down onto the engine.
Whenever engine is running and the valve
covers are removed, oil splashing in the
engine brake area could cause personal
injury.
Never remove any engine brake component
with the engine running. Personal injury may
result.
Brake lash settings must be made with the engine
stopped and cold and with the exhaust valves
closed.
BRAKE LASH SETTING
DETERMINING ENGINE OIL PRESSURE AND
OIL PRESSURE AT THE ENGINE BRAKE
UNITS
The engine brake requires a minimum oil
pressure to operate. The oil pressure reading on
the dash gauge is approximately the same as oil
pressure at the engine brake.
When determining minimum oil pressure, the oil
temperature must be at least 200°F (93°C) when
the test is performed. The pressure reading from
the dashboard oil pressure gauge is sufficient.
OIL PRESSURE REQUIREMENTS
If the oil pressure remains low, correct the engine
problem as described under “OIL PRESSURE
DROPPING BELOW MINIMUM REQUIRED FOR
ENGINE BRAKE OPERATION” in the MACK
PowerLeash™ Troubleshooting Guide included
in this section.
MACK PowerLeash™ Engine Brake
— Adjustment: 0.045 inch (1.14 mm)
— Brake lash adjusting tool: standard feeler gauge and
lb-in torque wrench
— Adjust following the firing order: 1, 5, 3, 6, 2, 4
MACK PowerLeash™ Engine Brake
— Engine rpm 2100: 35 psi (2.4 bar)
— Engine rpm 1100: 25 psi (1.7 bar)
5-111.bk Page 114 Monday, July 10, 2006 2:26 PM
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