5-101.bk Page 18 Friday, March 17, 2006 11:05 AM [213 CH] CAMSHAFT The piston crown, skirt and rod are marked FRONT. Be sure that rod, piston crown and skirt are properly aligned. Description The gear-driven carbon steel E7 camshaft, with its large journal bearing diameter of 2.689 inches (68.301 mm), provides excellent bearing unit loading and allows the use of large, durable camshaft lobes. E7 engine camshaft gears are pressed onto the camshaft. Disassembly An extremely tight interference fit holds the cam gears onto the camshaft. Ten tons of force are required to remove the gears. When cam gear installation or removal is required, use the following procedures.
A considerable amount of force may be necessary to remove damaged or spun gears. DO NOT apply more than 25 tons (22.7 metric tons) of force to gears. Doing so may shatter the gears and result in severe personal injury. Refer to Figure 5-18. 1. Position two adequate steel plates on the press to support camshaft gears. The plates should have a 2-1/2 inch (63.5 mm) hole cut out in the center when placed side by side, or similar size V-grooves, to allow clearance for the shaft journals and greater support for the gears. Figure 5-17 — Piston Markings 200330a 3.
Using a generous amount of clean engine oil, push piston wrist pin into piston wrist pin bore, aligning two piston sections and connecting rod. 4. Secure pin in position by inserting a snap ring in remaining piston snap ring groove. 2. Set camshaft, supported by the gears, into the press. 3. Using a suitable arbor, press camshaft out of camshaft gear and fuel injection pump drive gear. 5. Place the assembled piston in a clean location until it is needed for installation into sleeve. 6. Perform steps 1 through 5 on remaining pistons. Page 5-18 200 BENCH PROCEDURES