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200 BENCH PROCEDURES
Page 5-15
Inspection
Inspect piston ring grooves, lands, piston skirt
and combustion bowl for wear, scuffing, cracks or
blow-by. Pistons are NOT repairable. Discard
piston if it is damaged.
Do not stamp or engrave on TOP of piston. Doing
so will reduce piston life.
To ensure that pistons are reinstalled in the same
cylinders as removed, tag the piston with the
corresponding cylinder number.
[212 NV] PISTON RINGS
Before installing piston rings, check keystone ring
groove wear and ring end gap.
1. Place a piston ring in the piston sleeve.
Push it down into the sleeve with an inverted
piston to ensure that it is positioned squarely
in sleeve.
2. Using thickness gauges, check ring end
gap. Refer to the Fits and Limits chart in the
SPECIFICATIONS section for end gap
specifications. All rings to be used should be
checked in this manner.
Do not file or grind chrome-plated piston rings.
This may cause chrome to flake, resulting in ring
failure.
Keystone Ring Groove Check
Refer to Figure 5-12.
Keystone piston-ring groove gauge J 29510
consists of two 0.120-inch (3.048 mm) diameter
pins (1) connected at ends by two springs (2).
Figure 5-12 — Ring Groove Gauge
1. Place pins of keystone piston-ring groove
gauge J 29510 opposite each other in
groove to be measured, so they will be held
in position by springs.
Refer to Figure 5-13.
2. Using a four- to five-inch micrometer,
measure distance between outer edges of
two parallel pins. Check each compression
ring groove in two locations: parallel and
perpendicular to wrist pin bore. Record both
measurements.
3. Compare readings with specifications in Fits
and Limits chart in the SPECIFICATIONS
section.
1. Pins
2. Springs
200331a
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2
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5-101.bk Page 15 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...