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6
E N G IN E O V E R H A U L IN G
R e p la c in g o ve rs ize va lve s
R e m o ve th e se a ts b y m illin g th e rin g s. T a ke g re a t ca re n o t to d a m a g e th e
se a t lo ca tio n s in th e h e a d . C h e ck th e d ia m e te r o f th e se a t lo ca tio n s in th e
h e a d a n d ch o o se th e m o st su ita b le o ve rsize va lve se a t ta kin g in to a cco u n t
th a t cle a ra n ce s a t a sse m b ly sh o u ld b e 0 .0 0 4 7 ÷0 .0 0 6 3 in fo r th e in le t a n d
0 .0 0 4 3 ÷0 .0 0 6 2 in fo r th e e xh a u st. S p a re va lve se a ts a re su p p lie d w ith a n
o ve rsize o u te r d ia m e te r o f 0 .0 0 1 1 in . (m a rke d in W H IT E ) o r 0 .0 0 2 3
in . (m a rke d in R E D ).
E ve n ly h e a t th e h e a d a n d ke e p it fo r 1 h o u r a t a te m p e ra tu re o f 2 0 0 °C (3 9 2 °
F ).
In sta ll th e va lve se a ts a n d se t th e va lve se a ts w ith sp e cia l to o l.
A llo w to co o l th e n m ill th e se a ts an d g rin d th e va lve s.
V a lve g u id e s
C a rry o u t a ca re fu l visu a l ch e ck o f th e va lve g u id e s.
T h e va lve g u id e s sh o u ld b e ch e cke d fo r w e a r b y m e a su rin g th e cle a ra n ce
b e tw e e n th e va lve ste m a n d va lve g u id e ; u se a d ia l g a u g e a n d m e a su re th e
cle a ra n ce s o n th e "x" a n d "y" a xe s.
In le t va lve n o m ina l cle a ra n ce : 0 .0 0 0 7 8 7 ÷0 .0 0 1 8 1 in .
W e a r lim it: 0 .0 0 3 5 4 in .
E xh a u st va lve n o m in a l cle a ra n ce : 0 .0 0 0 7 8 7 ÷0 .0 0 1 8 1 in .
W e a r lim it: 0 .0 0 1 7 7 in .