Page 46
DESCRIPTION AND OPERATION
MACK PowerLeash™ Engine Brake
Components
The MACK PowerLeash™ engine brake consists
of the following primary components:
앫
Camshaft
— The engine brake camshaft
has a 0.125-inch engine brake lift profile
(dimension from sub-base to base circle) on
the exhaust lobes.
The 0.125-inch brake-bump camshaft is
mandatory for the PowerLeash™ engine
brake.
43
Figure 43 — MACK Engine Brake Exhaust Lobe Profile
앫
Exhaust Rocker Arm/Hydraulic
Actuator
— The exhaust rocker arm
incorporates a hydraulic actuator that fills
with oil and hydraulically locks to remove the
clearance between the actuator plunger and
the inboard exhaust valve. With clearance
between the actuator and the actuating pin
removed, the slight movement of the push
rod created when the camshaft rotates to the
area of transition from sub-base to base
circle, pushes the rocker arm and opens the
inboard exhaust valve before the piston
reaches top dead center of the compression
stroke.
44
Figure 44 — MACK Engine Brake Exhaust Rocker Arm
with Hydraulic Actuator
1. Valve Lash Adjusting
Screw
2. Engine Brake Hydraulic
Actuator
3. Constant (Lubrication) Oil
Passage
4. Engine Brake Lash
Adjusting Screw — This
is NOT the valve lash
adjusting screw.
5. Constant (Lubrication)
Oil Passage
6. Control Oil Passage
7. Constant (Lubrication)
Oil Passage
5-111.bk Page 46 Monday, July 10, 2006 2:26 PM
Summary of Contents for ASET AC
Page 6: ...TABLE OF CONTENTS Page iii TABLE OF CONTENTS 5 111 bk Page iii Monday July 10 2006 2 26 PM...
Page 14: ...INTRODUCTION Page 1 INTRODUCTION 5 111 bk Page 1 Monday July 10 2006 2 26 PM...
Page 23: ...Page 10 NOTES 5 111 bk Page 10 Monday July 10 2006 2 26 PM...
Page 96: ...COMPONENT LOCATOR Page 83 COMPONENT LOCATOR 5 111 bk Page 83 Monday July 10 2006 2 26 PM...
Page 99: ...Page 86 NOTES 5 111 bk Page 86 Monday July 10 2006 2 26 PM...
Page 100: ...TROUBLESHOOTING Page 87 TROUBLESHOOTING 5 111 bk Page 87 Monday July 10 2006 2 26 PM...
Page 140: ...MAINTENANCE Page 127 MAINTENANCE 5 111 bk Page 127 Monday July 10 2006 2 26 PM...
Page 153: ...Page 140 NOTES 5 111 bk Page 140 Monday July 10 2006 2 26 PM...
Page 383: ...Page 370 NOTES 5 111 bk Page 370 Monday July 10 2006 2 26 PM...
Page 479: ...Page 466 NOTES 5 111 bk Page 466 Monday July 10 2006 2 26 PM...
Page 480: ...SPECIFICATIONS Page 467 SPECIFICATIONS 5 111 bk Page 467 Monday July 10 2006 2 26 PM...
Page 505: ...Page 492 NOTES 5 111 bk Page 492 Monday July 10 2006 2 26 PM...
Page 513: ...Page 500 NOTES 5 111 bk Page 500 Monday July 10 2006 2 26 PM...
Page 519: ...Page 506 NOTES 5 111 bk Page 506 Monday July 10 2006 2 26 PM...
Page 520: ...APPENDIX Page 507 APPENDIX 5 111 bk Page 507 Monday July 10 2006 2 26 PM...
Page 528: ...INDEX Page 515 INDEX Index fm Page 515 Monday July 10 2006 2 48 PM...
Page 535: ...Page 522 NOTES Index fm Page 522 Monday July 10 2006 2 48 PM...