Clean Inside Of Valve Guide; Machine Grind Intake Valves; Mill Or Grind Valve Seats - Volvo D 20 Service Manual

Group 21 Engine
Cylinder head, cleaning - inspection
Clean inside of valve
Use rsamBr 5224
Note! Cutting oil must
Valves and seats must
F8
guide
be used when reaming,
be ground-in aftsr valve guide
'-'T-_____________
wr-
G ri nd i n g- i n va lve6 a n d seats
Operations F 9-1 2
F9
Machine g nd intako valvos
Edge of intake valve must not be lessthan 0.5 mm (0.02
In).
lmportant! Exhaustvalves are stellite coated and must
not be ground by machine. Grind-in valve on seatwith
grinding paste.
F10
Mill or grind valv6 seats
Grind to 45'.
Contact surface {a) must be:
-2.0 mm {0.08 in) for intake valve
-2.4 mm {0.09 in)for sxhaust valve.
ll contact surface is too wide reduc€ area with a 15q
lmponam! Outer diameter of cutter must no! Bxceeo
35,2 mm (1.39 in) for intake valve s€ats and 33.2 mm
{1.31 in)for sxhaust valve ssats.
F t l
cylinder head
Measuae gap between disc and
surfaco
Gap = max 1.5 mm 10.06 in).
Replace seat and possibly valve if gap is too Iarge.
Notel Two valvs types are available, see G3.
1.5 mm {0.00 in)
38