Volvo D 20 Service Manual page 22

Group 21 Engine
Valve adjustment
B4
Tum engine apProx. 1/4 iurn
Piston must not be at top dead center when setting
valve clearance, otherwise valves will contact piston
when tapp€t is deprsssed
I nco rrect clea ra nce ( BZBS )
B5
Dopress tappets
Turn tappets until grooves point slightly inward. using
tool 5196, depress tappets to obtain access to discs.
B6
Remove disc
Use 5195.
Calculate thickness ol disc to be used
Valve cl€arsnces when setting:
B7
Cold €ngine
Exhaust
Exhaust
0.20
0.40
in
0.008
0.016
0.25
0.010
0.45
0.018
Measurethicknessof old discwith a micrometer. Calcu-
late thickness of new disc to be used, see overleaf.
20