ACURA RL KA9 1996 Service Repair Manual

4. Remove the bolts, then remove the camshaft hold-

ers from the cylinder head.

5. Lift the camshaft out of the cylinder head, wipe it

clean, then inspect the lift ramps. Replace the

camshaft if any lobes are pitted, scored, or excessively

worn.

6. Clean the camshaft bearing surfaces in the cylinder

head, then set the camshaft back in place.

7. Place a plastigage strip across each journal.

8. Install the camshaft holders, then tighten the bolts

to the specified torque shown on the previous page.

9. Remove the camshaft holders. Measure the widest

portion of plastigage on each journal.

PLASTIGAGE STRIP
If camshaft-to-holder oil clearance is out of toler-

ance:

And the camshaft has already been replaced,

you must replace the cylinder head.

If the camshaft has not been replaced, first check

the total runout with the camshaft supported on

V-blocks.

Rotate camshaft

while measuring.

If the total runout of the camshaft is within toler-

ance, replace the cylinder head.

If the total runout is out of tolerance, replace the

camshaft and recheck. If the oil clearance is still

out of tolerance, replace the cylinder head.

11. Check cam lobe height wear.

Check this area for wear.
Cam Lobe Height Standard (New):

INTAKE 40.175 mm (1.5817 in)

EXHAUST 37.878 mm (1.4913 in)
Camshaft Total Runout:

Standard (New): 0.03 mm (0.001 in) max.

Service Limit: 0.04 mm (0.002 in)

Camshaft-to-Holder Oil Clearance:

Standard (New): 0.050 - 0.089 mm

(0.0020 - 0.0035 in)

Service Limit: 0.10 mm (0.004 in)ProCarManuals.com

Rocker Arms and Shafts

Clearance Inspection

Measure the intake rocker shafts and exhaust rocker

shaft.

1. Measure the diameter of the shaft at the first rocker

location.

Surface should be smooth.

MICROMETER

2. Zero the gauge to the shaft diameter.

MICROMETER

CYLINDER BORE

GAUGE
3. Measure the inside diameter of each rocker arm,

and check for an out-of-round condition.

Rocker Arm-to-Shaft Clearance:

Standard (NEW): 0.018 - 0.054 mm

(0.0007 - 0.0021 in)

Service Limit: 0.08 mm (0.003 in)

Inspect rocker arm

face for wear.

4. Repeat for all rockers.

If over the service limit, replace the rocker shaft and

all overtolerance rocker arms.ProCarManuals.com

Valves, Valv e Spring s an d Valv e Seal s
Remova l
NOTE: Identif y valve s an d valv e spring s a s the y ar e
remove d s o tha t eac h ite m ca n b e reinstalle d i n it s origi -
nal position .
1. Usin g a n appropriate-size d socke t an d plasti c mal -
let , lightl y ta p th e valv e retaine r t o loose n th e valv e
keeper s befor e installin g th e valv e sprin g compres -
sor.
PLASTI C MALLE T
SOCKET
2. Instal l th e valv e sprin g compressor . Compres s th e
spring , an d remov e th e valv e keepers .
VALVE SPRIN GCOMPRESSO RATTACHMENT
0775 7-PJ1010 A
VALVEKEEPER S
VALVE SPRIN G COMPRESSO R
Snap-o n CF71 1 o r EQUIVALEN T
(Commerciall y available )
3. Instal l th e valv e guid e sea l remover .
VALVE SEA L
SEALREMOVE R
VALVE GUID E SEA L REMOVE R
LISL E P/ N 5790 0 o r KD335 0
o r EQUIVALEN T
(Commerciall y available )
4. Remov e th e valv e seal .
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Valves, Valve Springs and Valve Seal s
Remova l (cont'd )
5. Inspec t th e valve s fo r wear .
Intak e Valv e Dimension s
A Standar d (New) :
B Standar d (New) :
C Standar d (New) :
C Servic e Limit :
D Standar d (New) :
D Servic e Limit :
32.90-33.1 0 m m
(1.295-1.30 3 in )
113.58-113.8 8 m m
(4.47 2 - 4.48 3 in )
5.4 8 - 5.4 9 mm
(0.2157-0.216 1 in )
5.4 5 m m (0.21 5 in )
0.85 - 1.1 5 mm
(0.03 3 - 0.04 5 in )
0.6 5 m m (0.02 6 in )
Exhaus t Valv e Dimension s
A Standar d (New) :
B Standar d (New) :
C Standar d (New) :
C Servic e Limit :
D Standar d (New) :
D Servic e Limit :
27.90-28.1 0 m m
(1.098-1.10 6 in )
116.03-116.3 3 m m
(4.56 8 - 4.58 0 in )
5.4 5 - 5.4 6 mm
(0.214 6 - 0.215 0 in )
5.4 2 m m (0.21 3 in )
1.35 - 1.6 5 mm
(0.05 3 - 0.06 5 in )
1.1 5 m m (0.04 5 in )
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Cylinder Head s
Warpag e
NOTE: I f camshaft-to-holde r oi l clearanc e (se e pag e
6-27) i s no t withi n specifications , th e cylinde r hea d can -
not b e resurfaced .
If camshaft-to-holde r oi l clearanc e i s withi n specifica -
tions, chec k th e cylinde r hea d fo r warpage .
If warpag e i s les s tha n 0.0 5 m m (0.00 2 in) , cylinde r
hea d resurfacin g i s no t required .
I f warpag e i s betwee n 0.0 5 m m (0.00 2 in ) an d 0. 2 m m
(0.00 8 in) , resurfac e th e cylinde r head .
Maximu m resurfac e limi t i s 0. 2 m m (0.00 8 in ) base d
on a heigh t o f 10 0 m m (3.9 4 in) .
Measur e alon g edge s an d thre e way s acros s th e center .
Cylinde r Hea d Height :
Standar d (New) : 99.9 5 - 100.0 5 m m
(3.93 5 - 3.93 9 in )
CYLINDE RHEAD HEIGH T
Measur e th e cylinde r hea d heigh t a t severa l points .
PRECISIO N STRAIGH T EDG E
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Valve Guides

Valve Movement

Wobble Method

Measure the guide-to-stem clearance with a dial indica-

tor while rocking the stem in the direction of normal

thrust.

Intake Valve Stem-to-Guide Clearance:

Standard (New): 0.04 - 0.10 mm

(0.002 - 0.004 in)

Service Limit: 0.16 mm (0.006 in)

Exhaust Valve Stem-to-Guide Clearance:

Standard (New): 0.10 - 0.16 mm

(0.004 - 0.006 in)

Service Limit: 0.22 mm (0.009 in)

Valve extended 10 mm out from seat.

If the measurement exceeds the service limit, recheck

using a new valve.

If the measurement is now within the service limit,

reassemble using a new valve.

If the measurement still exceeds the limit, recheck

using the alternate method, then replace the valve

and guide, if necessary.
Alternate Method

An alternate method of checking guide to stem clear-

ance is to subtract the O.D. of the valve stem, measured

with a micrometer, from the I.D. of the valve guide, mea-

sured with an inside micrometer or ball gauge. Take the

measurements in 3 places along the valve stem and

three places inside the valve guide. The difference

between the largest guide measurement and the small-

est stem measurement should not exceed the service

limit.

Intake Valve Stem-to-Guide Clearance:

Standard (New): 0.02 - 0.05 mm

(0.001 - 0.002 in)

Service Limit: 0.08 mm (0.003 in)

Exhaust Valve Stem-to-Guide Clearance:

Standard (New): 0.05 - 0.08 mm

(0.002 - 0.003 in)

Service Limit: 0.11 mm (0.004 in)ProCarManuals.com

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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Valve Guides
Reaming
NOTE: Fo r ne w valv e guide s only .
1 . Coa t bot h th e reame r an d valv e guid e wit h cuttin g
oil.
2. Rotat e th e reame r clockwis e th e ful l lengt h o f th e
valv e guid e bore .
REAME R HANDL EVALVE GUID EREAMER , 5. 5 m m
07HAH-PJ7010 B
Tur n reame r i n
clockwis e directio nonly.
3. Continu e t o rotat e th e reame r clockwis e whil e
removin g i t fro m th e bore .
4 . Thoroughl y was h th e guid e i n detergen t an d wate r
t o remov e an y cuttin g residue .
5 . Chec k th e clearanc e wit h a valv e (se e pag e 6-31 ).
Verif y tha t th e valv e slide s i n th e valv e guid e with -
ou t exertin g pressure .
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