ACURA TL 1995 Service Manual Online

Rocker Ar m Assembl y
Removal
NOTE:
Unscre w th e camshaf t holde r bolts , tw o turn s a t a
tim e i n a crisscros s pattern , t o preven t damagin g th e
valve s o r rocke r ar m assembly .
Whe n removin g th e rocke r ar m assembly , d o no t
remov e th e camshaf t holde r bolts . Th e bolt s wil l kee p
the camshaf t holders , th e spring s an d th e rocke r arm s
o n th e shafts .
CAMSHAF T HOLDE R BOLT S LOOSENIN G SEQUENCE :
Engin e No . 1300001~130926 2 (U.S.A.) , 1700001~170075 1 (Canada) :
6 m m BOLT S
8 m m BOLT S
Engine No . 1309263~ , 2300001~ , 3300001 ~ (U.S.A.) , 1700752~ , 270000 1 ~ ,
3700001 ~ (Canada) :
8 m m bolts :
NOTE : Refe r t o pag e 6-3 3 whe n installing .
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Camshaft

Inspection

NOTE:

Do not rotate the camshaft during inspection.

Remove the rocker arms and rocker shafts.

1. Put the camshaft and the camshaft holders on the

cylinder head, then tighten the bolts to the specified

torque.

Specified torque:

8 mm bolts: 22 N-m (2.2 kgf-m, 16 Ibf-ft)

6 mm bolts: 12 N-m (1.2 kgf-m, 8.7 Ibf-ft)

Engine No. 1300001~1309262 (U.S.A.), 1700001~1700751 (Canada):

6 mm BOLTS

8 mm BOLTS

Engine No. 1309263~, 2300001 ~, 3300001~ (U.S.A.), 1700752~, 2700001-

3700001~ (Canada):

8 mm bolts:

2. Seat the camshaft by pushing it toward the rear end

of cylinder head.ProCarManuals.com

Camshaft

Inspection (cont'd)

3. Zero the dial indicator against the rear end of the

camshaft. Push the camshaft back and forth, and

read the end play.

Camshaft End Play:

Standard (New): 0.05 - 0.15 mm

(0.002 - 0.006 in)

Service Limit: 0.15 mm (0.006 in)

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 excessive-

ly worn.

6. Clean the camshaft bearing surfaces in the cylinder

head, then set the camshaft back in place.

7. Insert 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.

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)

PLASTIGAGE STRIP
10.

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.

Camshaft Total Runout:

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

Service Limit: 0.04 mm (0.002 in)

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.

Cam Lobe Height Standard (New):

INTAKE 40.005 mm (1.5750 in)

EXHAUST 37.766 mm (1.4868 in)

Check this area for wear.
CAMSHAFTProCarManuals.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 the 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
sprin g an d remov e th e valv e keepers .
VALVE SPRIN G
COMPRESSO R
ATTACHMEN T
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 specia l too l a s shown .
VALVE SEA L
VALV E GUID E SEA L REMOVE R
LISL E P/ N 5790 0 o r KD335 0
o r EQUIVALEN T
(Commerciall y available )
SEALREMOVE R
4. Remov e th e valv e seal .
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Intake Valve Dimensions

A Standard (New):

B Standard (New):

C Standard (New):

C Service Limit:

D Standard (New):

D Service Limit:
32.90 - 33.10 mm

(1.295-1.303 in)

113.58-113.88 mm

(4.472 - 4.483 in)

5.48
-
5.49
mm

(0.216-0.216 in)

5.45 mm (0.215 in)

0.85-1.15 mm

(0.033 - 0.045 in)

0.65 mm (0.026 in)

Exhaust Valve Dimensions

A Standard (New):

B Standard (New):

C Standard (New):

C Service Limit:

D Standard (New):

D Service Limit:
27.90 - 28.10 mm

(1.098-1.106 in)

116.03-116.33 mm

(4.568 - 4.580 in)

5.45
-
5.46
mm

(0.215-0.215 in)

5.42 mm (0.213 in)

1.35-1.65 mm

(0.053 - 0.065 in)

1.15 mm (0.045 in)ProCarManuals.com

Cylinder Head s
Warpag e
NOTE: I f camshaft-to-holde r oi l clearanc e (se e pag e
6-23) i s no t withi n specifications , th e cylinde r hea d can -
not b e resurfaced .
I f 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 .
I f 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 is 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
o n a heigh t o f 10 0 m m (3.9 4 in) .
PRECISIO N STRAIGH T EDG E
Measur e alon g edges , 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
Measure th e cylinde r hea d heigh t a t severa l points .
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Valve Guide s
Valve Movemen t
Measure th e guide-to-ste m clearanc e wit h a dia l indica -
to r whil e rockin g th e ste m in th e directio n o f norma l
thrus t (wobbl e method) .
Intak e Valv e Stem-to-Guid e Clearance :
Standar d (New) : 0.0 4 - 0.1 0 m m
(0.00 2 - 0.00 4 in )
Servic e Limit : 0.1 6 m m (0.00 6 in )
Exhaus t Valv e Stem-to-Guid e Clearance :
Standar d (New) : 0.10-0.1 6 m m
(0.004-0.00 6 in )
Servic e Limit : 0.2 2 m m (0.00 9 in )
Valv e extende d 1 0 m m ou t fro m seat .
If th e measuremen t exceed s th e servic e limit , rechec k
usin g a ne w valve .
If th e measuremen t i s no w withi n th e servic e limit ,
reassembl e usin g a ne w valve .
I f th e measuremen t stil l exceed s th e limit , rechec k
using th e alternat e metho d tha t follows , the n replac e
the valv e an d guide , i f necessary . NOTE
: A n alternat e metho d o f checkin g guid e t o ste m
clearanc e is t o subtrac t th e O.D . o f th e valv e stem , mea -
sure d wit h a micrometer , fro m th e I.D . o f th e valv e
guide , measure d wit h a n insid e micromete r o r bal l
gauge . Tak e th e measurement s in thre e place s alon g th e
valv e ste m an d thre e place s insid e th e valv e guide . Th e
differenc e betwee n th e larges t guid e measuremen t an d
th e smalles t ste m measuremen t shoul d no t excee d th e
servic e limit .
Intak e Valv e Stem-to-Guid e Clearance :
Standar d (New) : 0.0 2 - 0.0 5 m m
(0.00 1 - 0.00 2 in )
Servic e Limit : 0.0 8 m m (0.00 3 in )
Exhaus t Valv e Stem-to-Guid e Clearance :
Standard (New) : 0.0 5 - 0.0 8 m m
(0.00 2 - 0.00 3 in )
Servic e Limit : 0.1 1 m m (0.00 4 in )
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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 6-28 ), replac e
the m (se e pag e 6-30 ) befor e cuttin g th e valv e seats .
2.
3.
4 .
VALV E SEA TCUTTE R(Commerciall y available )
Carefully 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 .
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 .
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 .
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 1.2 5 - 1.5 5 m m
(0.04 9 - 0.06 1 in )
Servic e Limit : Intak e 2. 0 m m (0.0 8 in )
Exhaus t 2. 0 m m (0.0 8 in )
SEA T WIDT H
5.
6.
7 .
8.
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 , an d 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 LSEATIN GSURFAC E
VALVESEAT
PRUSSIA N BLU E COMPOUN D
The 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
the 45 ° cutter .
Insert th e intak e an d exhaus t valve s i n th e hea d an d
measur e th e valv e ste m installe d height .
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
If 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 the cylinde r head ; the valv e sea t in
th e hea d is to o deep .
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Valve Guide s
Replacemen t
1. 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
fit th e diameter of 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 .
VALVE GUID E DRIVE R(Commerciall y available )
VALVE GUID E DRIVER , 5. 5 m m07742-001010 0
2. Selec t th e prope r replacemen t guide s 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 :
Alway s 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
6.
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 .
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 .
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