Mack Trucks — 5-101.bk (EN)

5-101.bk Page 25 Friday, March 17, 2006 11:05 AM 1 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. 2 5. Remove valve lifters. 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. [212 NP & LQ] PISTON AND CONNECTING ROD ASSEMBLY 3 3 4 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. 200365a Figure 4-30 — Camshaft Thrust Washer Capscrews Refer to Figure 4-31. 3. Install the camshaft removal/installation tool J 41461 (3) in position on the rear segment of the camshaft (1), securing it with the clip (2) to the shaft. 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. 1 Remove connecting rod and piston assemblies in companion cylinder sets: 1 and 6, 2 and 5, and 3 and 4. 2 1.

Rotate engine stand 90 degrees so that pistons lie horizontally in the block with top of pistons and connecting rods accessible. 3 2. Rotate crankshaft so that pistons 1 and 6 are lowered in the cylinder at least two inches (51 mm) to allow adequate room to remove carbon from upper edge of sleeves. Figure 4-31 — Camshaft Removal/Installation Tool 200573a Page 4-25 200 ENGINE DISASSEMBLY 1. Thrust washer 2. Openings 3. Capscrew, 12-point 4. Camshaft drive gear 1. Rear segment of camshaft 2. Tool retaining clip 3. Camshaft removal/ installation tool