Volvo Penta 2002 - DI Sassem Bl I Ng T He Cyl I Nder Head; Val Ve Gui des; Val Ve Seat S; Val Ves

THE CYLI NDER
HEAD
1 . Remove t he
" col l et s" and val ve
spr i ngs usi ng
a val ve
bow . Remove t he val ves . Remove
t
he val ve st em seal s .
Pl ace t he
val ves
i n t he
pr oper sequence i n a val ve
st and .
Val ve
gui des
2 . Check t he val ve gui de wear by i nser t i ng anew val ve st em
i nt o t he gui de . Measur e t he pl ay
usi ng
a di al i ndi cat or
.
I f
necessar y, r epl ace t he val ve gui des .
Wear l i mi t s :
I nl et
val ve, max pl ay . . . . . . . . . . . . . . . 0 . 15
mm ( 0 . 0059
i n)
Exhaust val ve, max pl ay . . . . . . . . . . . . 0 . 15 mm ( 0 . 0059 i n)
3 . Use
mandr el p/ n 5218 t o pr ess out t he val ve gui des
.
Oi l
t he new val ve gui des ext er nal l y and use mandr el p/ n
884559 t o
i nst al l
t hem
.
Pr ess down t he mandr el al l t he way
down t o t he cyl i nder head . Ream t he val ve gui des i f
necessar y
.
Val ve
seat s and val ves
4 . Mi l l or r eam t he val ve seat s . The angl e
( C)
shoul d be 45°
( f or
2003T, 30° f or t he i nl et val ve) . The
seal i ng
sur f ace' s
wi dt h
( B) shoul d be 1 ±0 . 1 mm ( 0 . 039±0 . 0039 i n) . Gr i nd t he val ves
i n
a val ve
gr i ndi ng machi ne
.
The angl e ( D) ,
see
Tech . dat a . I f
t he
di sc t hi ckness af t er gr i ndi ng i s l ess
t han 1
. 0
mm ( 0 . 039 i n)
f or nat ur al l y aspi r at ed engi nes or 0 . 8 mm
( 0. 031
i n) f or
t ur bochar ged engi nes, t he val ves must be scr apped . Val ves
wi t h
bent st ems, or i f t he measur ement ( A) exceeds 2 . 5 mm ( 0 . 098
i n)
must al so be scr apped . Gr i nd t he
val ve t i p
t owar ds t he
r ocker s i f necessar y . Lap i n t he val ves usi ng val ve gr i ndi ng
past e and check t he cont act ar ea
wi t h
mar ki ng dye .
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