Valve Rocker Arm Stud Removal - Volvo Penta 5.0 GL Manual

Engine — 5.0 & 5.7 Litre
4
3
Valve Rocker Arm Stud
Removal
68
Inspect the valve contact surface for the following:
6.
• Undersized margin (1)
• Pitted surfaces (2)
• Burnt or eroded areas (3)
1
• Acceptable edge (margin) (4)
2
Valves with excessive damage must be replaced.
Minor imperfections of the valve or valve seat may be repaired.
Reconditioning of the valves and valve seats:
7.
• The valves must seat perfectly for the engine to deliver opti-
• Cooling the valve heads is another important factor. Good
• Regardless of what type of equipment is used, it is essential
The valve seats should be concentric to within 0.05 mm (0.002 in)
total indicator reading.
• Reface pitted valves on a valve refacing machine in order to
• Replace the valve if the valve stem is excessively worn or
• Replace the valve if the edge margin (4) of the valve head is
Several different types of equipment are available for reconditioning
valves and valve seats. Follow the equipment manufacturer's rec-
ommendations for equipment use to attain the proper results.
Tools Required
J5802 Rocker Arm Stud Remover
NOTICE! Valve rocker arm ball studs that have damaged
mum power and performance.
contact between each valve and valve seat in the cylinder
head is necessary to insure that the heat in the valve head is
properly carried away.
that the valve guide bores are free from carbon or dirt in
order to ensure the proper centering of the pilot in the valve
guide.
ensure the correct relationship between the valve head and
the valve stem.
warped.
less than 0.79 mm (0.031 in) thick after grinding.
threads or are loose in the cylinder heads should be
replaced.
VPA 7748089 English 09-2007