Mack Truck Mechanical Marine Engine M-E7 Operating Maintenance & Service Manual(5-108)

Page 129

5_108.bk Page 117 Thursday, October 4, 2001 11:45 AM

REPAIR INSTRUCTIONS 3. Install the camshaft removal/installation tool J 41461 (3) onto the rear segment of the camshaft (1), securing it with the clip (2) to the shaft.

Piston and Connecting Rod Assembly Removal

148

The crankshaft and related components are heavy, have sharp edges and many possible pinch points. Always be careful while working in this area to avoid serious personal injury.

Before removing pistons, connecting rods and rod caps, ensure they are marked so they can be reinstalled in the same cylinders from which they were removed. Figure 148 — Camshaft Removal/Installation Tool 1. Rear Segment of Camshaft 2. Tool Retaining Clip

3. Camshaft Removal/ Installation Tool

4. Taking care not to damage camshaft or bushings, pull camshaft out of the front of the engine. Carefully guide rear of shaft through the journals. If shaft does not come out freely, ensure all valve lifters are clear of camshaft cams and journals. 5. Remove valve lifters.

Remove connecting rod and piston assemblies in companion cylinder sets: 1 and 6, 2 and 5, and 3 and 4. 1. Rotate engine stand 90 degrees so that pistons lie horizontally in the block with top of pistons and connecting rods accessible. 2. Rotate crankshaft so that pistons 1 and 6 are lowered in the cylinder at least two inches (51 mm). This allows adequate room to remove carbon from the upper edge of the sleeves.

Valve lifters have established wear patterns and should be reinstalled in same locations. Label each valve lifter upon removal and place on a clean work surface.

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MAINTENANCE

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MAINTENANCE

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MAINTENANCE

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TROUBLESHOOTING

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INTRODUCTION

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