200 ENGINE ASSEMBLY
Page 6-59
[213 LP] ROCKER ARMS
Description
The valve rockers pivot on a shaft supported by
three brackets per cylinder head. Two capscrews
secure each bracket to the cylinder head. The
rocker arms are operated by a camshaft through
valve lifters and push rods extending through the
cylinder heads. A coil spring returns each valve to
the closed position, holding the rocker arm in
contact with the push rod.
Installation (Non-Brake and
Dynatard Equipped Engines)
Refer to Figure 6-69.
1. Position the rocker arm assemblies on the
cylinder heads.
2. Ensure that the ball end of the rocker arm
adjusters are in position in the push rod
cups.
Make sure that adjusting screws are retracted
upward in the rocker arms. If extended far below
rocker arm, the push rods can be bent when
tightening the rocker arm assembly brackets.
3. Lubricate the threads of the rocker arm
mounting capscrews with clean engine oil.
Install the capscrews and torque to 40 lb-ft
(54 N
폷
m) using torque wrench J 24407 or
equivalent.
4. Adjust valve and engine brake slave piston
lash settings as applicable. Refer to the
SETUP AND ADJUSTMENTS section in this
manual for correct specification.
Figure 6-69 — Valve Rocker Arm Installation
Installation (Jake Brake-Equipped
Engines)
Use only Jacobs exhaust rocker arm adjusting
screws for Jacobs engine brake installation.
Using a MACK or any other type of screw will
result in severe screw wear and engine damage.
Jacobs exhaust rocker screws have hex heads.
MACK screws have a screwdriver slot.
Refer to Figure 6-70.
Verify that Jacobs exhaust rocker arm adjusting
screws are installed in the exhaust rocker arms.
Turn the screws all the way into the rocker arms
from the underside. Install the MACK locknuts.
1. Install the rocker arm assemblies. Apply
clean engine oil to the MACK hold-down
capscrews. Install one capscrew with a
washer in each bracket next to the push
rods. Each rocker assembly has three
brackets.
5-101.bk Page 59 Friday, March 17, 2006 11:05 AM
Summary of Contents for E7
Page 1: ...E7 ENGINE OVERHAUL AUGUST 1997 ENGINE 5 101...
Page 2: ...Page 0 front fr5 Page 0 Friday March 17 2006 11 04 AM...
Page 5: ...E7ENGINE OVERHAUL MARCH 2006 2 5M REP AUGUST 1997 10M MACK TRUCKS INC 1997 ENGINE 5 101...
Page 13: ...ABOUT THIS MANUAL Page ix ABOUT THIS MANUAL front fr5 Page ix Friday March 17 2006 11 04 AM...
Page 15: ...TABLE OF CONTENTS Page xi TABLE OF CONTENTS front fr5 Page xi Friday March 17 2006 11 04 AM...
Page 24: ...Page xx NOTES front fr5 Page xx Friday March 17 2006 11 04 AM...
Page 31: ...200 SPECIFICATIONS Page 2 1 SPECIFICATIONS 5 101 bk Page 1 Friday March 17 2006 11 05 AM...
Page 55: ...200 ENGINE REMOVAL Page 3 1 ENGINE REMOVAL 5 101 bk Page 1 Friday March 17 2006 11 05 AM...
Page 58: ...Page 3 4 NOTES 5 101 bk Page 4 Friday March 17 2006 11 05 AM...
Page 90: ...Page 4 32 NOTES 5 101 bk Page 32 Friday March 17 2006 11 05 AM...
Page 91: ...200 BENCH PROCEDURES Page 5 1 BENCH PROCEDURES 5 101 bk Page 1 Friday March 17 2006 11 05 AM...
Page 158: ...Page 5 68 NOTES 5 101 bk Page 68 Friday March 17 2006 11 05 AM...
Page 159: ...200 ENGINE ASSEMBLY Page 6 1 ENGINE ASSEMBLY 5 101 bk Page 1 Friday March 17 2006 11 05 AM...
Page 240: ...Page 6 82 NOTES 5 101 bk Page 82 Friday March 17 2006 11 05 AM...
Page 272: ...Page 8 10 NOTES 5 101 bk Page 10 Friday March 17 2006 11 05 AM...
Page 273: ...200 TROUBLESHOOTING Page 9 1 TROUBLESHOOTING 5 101 bk Page 1 Friday March 17 2006 11 05 AM...
Page 292: ...Page 9 20 NOTES 5 101 bk Page 20 Friday March 17 2006 11 05 AM...
Page 293: ...200 APPENDIX Page 10 1 APPENDIX 5 101 bk Page 1 Friday March 17 2006 11 05 AM...
Page 295: ...200 APPENDIX Page 10 3 E7 LUBRICATION SYSTEM 5 101 bk Page 3 Friday March 17 2006 11 05 AM...
Page 296: ...Page 10 4 200 APPENDIX E7 COOLING SYSTEM 5 101 bk Page 4 Friday March 17 2006 11 05 AM...
Page 297: ...INDEX Page 11 1 INDEX INDEX FR5 Page 1 Friday March 17 2006 11 04 AM...
Page 302: ...Page 11 6 NOTES INDEX FR5 Page 6 Friday March 17 2006 11 04 AM...
Page 303: ...E7 ENGINE OVERHAUL PRINTED IN U S A ENGINE 5 101 MACK TRUCKS INC 1997...