Page 53 - CTS - Mechanic Diesel - TP

MECHANIC DIESEL - CITS

TASK 2: Overhauling rocker arm assembly (Fig 1 & 2)

Fig 1 Fig 2

• Remove the lock-screw/circlips (1) at both ends of the rocker shaft.(2)
• Remove the rocker levers (3) rocker lever bracket (4), springs (5) and spacers from the rocker shaft. (Fig 1)
• Remove the rocker bracket which supplies oil to the rocker shaft from the cylinder head. The position of the
bracket varies from one make to another make (Consult your instructor).
• Clean the dismantled parts of rocker arm assembly.
• Check the tension of the rocker spring(5). Replace it, if necessary.

• Check visually the rocker lever for cracks, pitting on tips (6). Check the condition of the threads by screwing
the adjusting screw (7) in threads.
• Check the rocker shaft (2) visually for cracks and damage.

• Check the rocker arm bushing (8) for wear and tear and alignment of lubricating holes.(9) (Fig 2)
• Check the rocker arm ball pins (10) for wear and damage.
• Clean the base of the rocker shaft supports, and the seats on the cylinder head.
• Fix the ball pins on the rocker arm.
• Insert the inlet (3) and exhaust rocker lever (12), spring (5) and the distance piece between the two rocker
shaft supports(4) in the rocker arm shaft (2) and fix the circlip at the both ends of the rocker shaft
• Loosen the ball pin’s (10) nuts, to ensure that the push-rods do not bend, while tightening the rocker shaft
support bracket’s (4) nuts/ bolts (V3) on the cylinder head.

36
CITS : Automotive - Mechanic Diesel - Exercise 2.14