Page 50
DESCRIPTION AND OPERATION
49
Figure 49 — Exhaust Yoke, Actuating Pin and Valve
Stem Cap
앫
Spring-Loaded Push Rods
— To prevent
excessive valve “clatter” created by the
increased exhaust valve lash, and also keep
the lifter roller in contact with the cam lobe,
spring-loaded push rods are used. These
push rod assemblies contain a spring on the
rocker arm end. The spring allows the push
rod to “expand” during the “valve closed” (or
cam sub-base circle) cycle, thus eliminating
excessive lash in the valve train and keeping
the lifter roller in contact with the cam lobe.
During the “valve opening” cycle, the spring
compresses as the lifter roller travels up the
ramp of the cam lobe. The push rod
becomes a “solid assembly” when the
internal stops of the upper and lower push
rod seats make contact. When the push rod
is “solid,” the upward force of the valve lifter
is transmitted to the rocker arm.
50
Figure 50 — Spring-Loaded Push Rod Assembly
앫
Cylinder Head Cover
— The MACK
PowerLeash™ engine brake is completely
integrated with the valve train; therefore,
cylinder head cover spacers are not
necessary. The cylinder head cover contains
an electrical pass-through connection that
connects the engine brake solenoid wire to
the engine wiring harness.
51
Figure 51 — Cylinder Head Cover with Electrical
Pass-Through Connection
1. Valve Yoke, Exhaust
2. Actuating Pin
3. Cap, Inboard Exhaust
Valve Stem Tip
1. Push Rod Spring
1. Electrical Pass-Through Connector
5-111.bk Page 50 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...