1996 ACURA RL KA9 Service Repair Manual

Valve Seat s
Reconditionin g
1. Rene w th e valv e seat s i n th e cylinde r hea d usin g a
valv e sea t cutter .
NOTE : I f th e guide s ar e wor n (se e pag e 6-31 ),
replac e the m (se e pag e 6-33 ) befor e cuttin g th e
valv e seats .
VALV E SEA T
CUTTE R
(Commerciall y available )
2. Carefull y cu t a 45 ° seat , removin g onl y enoug h
materia l t o ensur e a smoot h an d concentri c seat .
3 . Beve l th e uppe r edg e o f th e sea t wit h th e 30 ° cutte r
an d th e lowe r edg e o f th e sea t wit h th e 60 ° cutter .
Chec k th e widt h o f th e sea t an d adjus t accordingly .
SEAT WIDT H
4. Mak e on e mor e ver y ligh t pas s wit h th e 45 ° cutte r t o
remov e an y possibl e burr s cause d b y th e othe r cut -
ters .
5. Afte r resurfacin g th e seat , inspec t fo r eve n valv e
seating : Appl y Prussia n Blu e compoun d t o th e valv e
face , inser t th e valv e i n it s origina l locatio n i n th e
head , the n lif t i t an d sna p i t close d agains t th e sea t
severa l times .
ACTUA LSEATINGSURFAC E
6. Th e actua l valv e seatin g surface , a s show n b y th e
blu e compound , shoul d b e centere d o n th e seat .
I f i t i s to o hig h (close r t o th e valv e stem) , yo u
mus t mak e a secon d cu t wit h th e 60 ° cutte r t o
mov e i t down , the n on e mor e cu t wit h th e 45 °
cutte r t o restor e sea t width .
I f i t i s to o lo w (close r t o th e valv e edge) , yo u
mus t mak e a secon d cu t wit h th e 30 ° cutte r t o
mov e it up , the n on e mor e cu t wit h th e 45 ° cutte r
t o restor e sea t width .
NOTE : Th e fina l cu t shoul d alway s b e mad e wit h
th e 45 ° cutter .
7 . Inser t th e intak e an d exhaus t valve s i n th e hea d an d
measur e valv e ste m installe d height .
8 . I f valv e ste m installe d heigh t i s ove r th e servic e limit ,
replac e th e valv e an d recheck . I f i t i s stil l ove r th e ser -
vic e limit , replac e th e cylinde r head ; th e valv e sea t i n
th e hea d is to o deep .
Valv
e Sea t Width :
Standar d (New) : Intak e 0.8 0 - 1.0 0 m m
(0.03 1 - 0.03 9 in )
Exhaus t 1.25-1.5 5 m m
(0.04 9 - 0.06 1 in )
Servic e Limit : Intak e 1. 5 m m (0.0 6 in )
Exhaus t 2. 0 m m (0.0 8 in ) Valv
e Ste m Installe d Height :
Standar d (New) : Intak e 46.93 5 - 47.42 5 m m
(1.8478-1.867 1 in )
Exhaus t 47.88 5 - 48.37 5 m m
(1.8852-1.904 5 in )
Servic e Limit : Intak e 47.62 5 m m (1.875 0 in )
Exhaus t 48.57 5 m m (1.912 4 in )
VALV E STE MINSTALLE D HEIGH T
VALVESEAT
PRUSSIA N BLU E COMPOUN D
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Valve Guide s
Replacemen t
As illustrate d below , us e a commerciall y availabl e
air-impac t valv e guid e drive r attachmen t modifie d t o
fi t th e diamete r o f th e valv e guides . I n mos t cases ,
th e sam e procedur e ca n b e don e usin g th e specia l
too l an d a conventiona l hammer .
2 . Selec t th e prope r replacemen t guides , an d chil l the m
i n th e freeze r sectio n o f a refrigerato r fo r abou t a n hour .
3 . Us e a ho t plat e o r ove n t o evenl y hea t th e cylinde r
hea d t o 300° F (150°C) . Monito r th e temperatur e wit h
a cookin g thermometer .
CAUTION :
D o no t us e a torch ; i t ma y war p th e head .
D o no t ge t th e hea d hotte r tha n 300° F (150°C) ;
excessiv e hea t ma y loose n th e valv e seats .
T o avoi d burns , us e heav y glove s whe n handlin g
th e heate d cylinde r head . 4
. Workin g fro m th e camshaf t side , us e th e drive r an d a n
ai r hamme r t o driv e th e guid e abou t 2 m m (0. 1 in )
toward s th e combustio n chamber . Thi s wil l knoc k of f
som e o f th e carbo n an d mak e remova l easier .
CAUTION :
Always wea r safet y goggle s o r a fac e shiel d
whe n drivin g valv e guides .
Hol d th e ai r hamme r directl y i n lin e wit h th e
valv e guid e to preven t damagin g th e driver .
5 . Tur n th e hea d ove r an d driv e th e guid e ou t towar d
th e camshaf t sid e o f th e head .
VALV E GUID E DRIVER , 5. 5 m m0774 2-001010 0
If a valv e guid e stil l won' t move , dril l i t ou t wit h a
8 m m (5/1 6 in ) bit , the n tr y again .
CAUTION : Dril l guide s onl y in extrem e cases : yo u
coul d damag e th e cylinde r hea d if th e guid e breaks .
6 . Remov e th e ne w guide s fro m th e freezer , on e a t a
time , a s yo u nee d them .
VALV E GUID E DRIVE R(Commerciall y available )5.3 m m(0.2 1 in)
10. 8 mm(0.4 2 in)
57 m m(2.2 4 in)87 m m(3.4 3 in)orVALV E GUID E DRIVER , 5. 5 m m07742-001010 0
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Valve Guide s
Replacemen t (cont'd )
7. Appl y a thi n coa t o f clea n engin e oi l t o th e outsid e o f
the ne w valv e guide . Instal l th e guid e fro m th e
camshaf t sid e o f th e head ; us e th e specia l too l t o
driv e th e guid e i n t o th e specifie d installe d height . I f
yo u hav e al l 1 2 guide s t o do , yo u ma y hav e t o rehea t
th e head .
VALV E GUID E
DRIVER , 5. 5 m m
07742-001010 0
Valve Guid e Installe d Height :
Intake : 15.7 5 - 16.2 5 m m (0.62 0 - 0.64 0 in )
Exhaust : 15.7 5 - 16.2 5 m m (0.62 0 - 0.64 0 in )
VALV E GUID E
Measure here .
CYLINDE R HEA D
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