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Page 5-14
200 BENCH PROCEDURES
The two-piece piston design incorporates two
compression ring grooves and one oil ring
groove. A plasma-faced, keystone-type ring is
used in the top ring location. A tapered chrome,
rectangular-type ring is used in the second ring
groove. The oil control ring is located in the third
(or lower) groove, nearest the piston pin bore.
New piston rings are designed to further improve
oil control, especially relating to particulates
control.
E7 piston crowns have been modified in the oil
control ring groove area. During the second
quarter of 1996, the oil drainback holes have
been eliminated and replaced by an oil
accumulator relief. The relief is machined into the
lower half of the third ring land face, 360 degrees
around the piston circumference.
Current E7 pistons are NOT interchangeable with
1989/1990 E7 pistons.
Special Tools Required
앫
Piston Ring Expander PT6587
앫
Keystone Ring Groove Gauge J 29510
Disassembly
Refer to Figure 5-11.
1. Using piston ring expander PT6587, remove
piston rings.
Figure 5-11 — Piston Ring Removal
2. Thoroughly clean ring grooves and
combustion bowl area. All carbon must be
removed. Carbon left in grooves will reduce
ring clearance and prevent replacement
rings from seating properly.
Be sure that cleaning solvent is approved for
steel/aluminum. Incompatible solvent may cause
damage to pistons or skirts.
3. Clean pistons with approved solution and a
brass brush. Take care to avoid damaging
pistons while cleaning.
5-101.bk Page 14 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...