SPRING-VALVE 1011177 - Caterpillar

Illustration 1 g01192998
(1) Timing bolt location (2) Diameter of camshaft journal ... 173.80 0.03 mm (6.843 0.001 inch)Bore in camshaft bearing after installation ... 174.151 0.02 mm (6.8563 0.0008 inch) (3) Thickness of new plate ... 11.80 0.05 mm (0.465 0.002 inch)
Illustration 2 g01193003
Location of dowels on the camshaft bearing journal
Illustration 3 g00469453
Location of dowels on the camshaft bearing journal
Correct cam segment relationship (timing) must be observed at assembly. If the cam segments are out of time, serious engine damage will occur.
Note: The position of the single dowel in relation to the variable dowel determines the letter designation of the cam journals. The single dowel is located on the same end as the locating groove. The variable dowel is located on the end opposite the locating groove. (5) Locating groove (6) Location of the single dowel in the face of the camshaft bearing journal Distance from the top of the dowel to the camshaft bearing journal ... 7.0 0.5 mm (0.28 0.02 inch) (7) Location of the variable dowel in the face of the camshaft bearing journal Distance from the top of the dowel to the camshaft bearing journal ... 7.0 0.5 mm (0.28 0.02 inch)
Illustration 4 g01193020
Letter designation of C280-6 camshaft journals
Illustration 5 g01193058
Letter designation of C280-8 camshaft journals (8) Camshaft bearing journalInstall the camshaft bearing journals with the grooved end toward the front of the engine. (9) Camshaft segmentsInstall the camshaft segments with the grooved flange toward the front of the engine for SAE standard rotation engines. Install the camshaft segments with the grooved flange toward the front of the engine for SAE opposite rotation engines. (10) Torque of the bolts for the camshaft segment ... 270 40 N m (200 30 lb ft) (11) The camshaft must be assembled in an assembly fixture or the camshaft must be assembled in the cylinder block. Apply a force at the rear end of the camshaft (11) . The rolling torque for the C280-6 must be a maximum of the following value. ... 22 N m (16 lb ft) Apply a force at the rear end of the camshaft (11) . The rolling torque for the C280-8 must be a maximum of the following value. ... 28 N m (21 lb ft)
Illustration 6 g00289772
(12) Specified camshaft lobe liftTo find the specified camshaft lobe lift, use the procedure that follows:
Measure the total height of the camshaft (13) .
Measure base circle (14) .
Subtract base circle (14) from the total height of camshaft (13) . The difference is the specified camshaft lobe lift (12) .
Specified camshaft lobe lift (12) for the camshaft is the following value:Exhaust lobe ... 19.500 mm (0.7677 inch)Inlet lobe ... 19.500 mm (0.7677 inch)Lobe for the fuel injection pump ... 21.473 mm (0.8454 inch)