Valve Train Components; Cylinder H E A - Chevrolet 1988 Light Duty Truck Repair Manual

VALVE TRAIN COMPONENTS

PUSHRODS, ROCKER ARMS, BALLS, AND NUTS
IQ * C lean
• Parts in solvent. Blow dry with com pressed air. Make
sure the oil passages in the pushrods are clear.
f f In sp ect (F ig u re 4)
— Rocker arm s (13) and balls (12) at their mating
surfaces. These surfaces should be smooth and
free from scoring or other damage.
— Rocker arm areas w hich contact the valve stems,
and the sockets which contact the pushrods (20).
These areas should be smooth and free of dam age
and wear.
— Nuts (11). The nuts are prevailing torque nuts. At
least 6.2 N m (55 in. lbs.) torque should be required
to thread the nuts onto the rocker arm studs. If not, it
is possible that the nut(s) could back off during
engine operation, causing loss of lash and valve
train noise.
— Pushrods for bending. Roll the pushrod on a flat
s u rfa c e to d e te rm in e if it is bent. R e p la ce if
necessary.
— Ends of the pushrods for scoring or roughness.
HYDRAULIC LIFTERS
Refer to GENERAL ENGINE M ECHANICAL (SEC. 6A).
CYLINDER HEAD
DISASSEMBLY
D isassem b le (F ig u res 3 4 , and 35)
Tool Required:
J-8062 Valve Spring Com pressor
1. Valve keys (15).
• Com press the valve springs (19), using J-8062
(figure 35).
• Remove the valve keys.
• Remove the tool.
2. Rotators (17), and shields (18).
3. Valve springs (20) and dam pers (240).
4. O-ring seals (16) and seals (19).
Figure 33 — Installing the Oil Pump Screen and Pipe
4.8 LITER L6 6A4-19
19. Seal
20. S p rin g
15. Valve Key
16. O -rin g Seal 42. In ta k e Valve
43. E x h a u s t Valve
17. R o ta to r
240. D a m p e r
18. S h ie ld
Figure 34 — Valves and Com ponents
Figure 35— Compressing the Valve Springs
B-09438
B-07999