Volvo Penta TD520GE Workshop Manual page 88

Checks and adjustments
Design 1
without flange
98
Design 1
with flange
7. Check and measure the valves.
A. – Valve stem diameter: standard
B. – Valve edge thickness
C. – Valve head diameter:
8. Check the valve seats rings and wear limits.
Design 2
On later designs, the o-ring is exchanged
for a valve rod seal, according to the
picture for design 2.
Inlet valve: ..................................... 8.98
(0.03535"-0.0006")
Exhaust valve: ............................... 8.96
(0.3528"-0.0006")
Wear limits:
Inlet valve: .................................. 2.1 mm (0.08")
Exhaust valve: ............................ 1.8 mm (0.07")
Inlet valve: ................................... 48.0 ±0.1 mm
(1.89 ±0.004")
Exhaust valve: ............................. 42.0 ±0.1 mm
(1.65 ±0.004")
Wear limit for valve seat width.
Inlet valve: .................................. 2.8 mm (0.11")
Exhaust valve: ............................ 2.2 mm (0.09")
Group 21
-0.015
mm
-0.015 mm