1995 ACURA TL Service Repair Manual

Valves, Valve Springs and Valv e Seal s
Remova l (cont'd )
Intake Valv e Dimension s
A Standar d (New) : 33. 9 - 34. 1 m m
(1.33-1.3 4 in )
B Standar d (New) : 110.88-111.1 8 m m
(4.36 5 - 4.37 7 in )
C Standar d (New) : 5.47 5 - 5.48 5 m m
(0.2156-0.215 9 in )
C Servic e Limit : 5.44 5 m m (0.214 4 in )
D Standar d (New) : 0.8 5 - 1.1 5 m m
(0.03 3 - 0.04 5 in )
D Servic e Limit : 0.6 5 m m (0.02 6 in )
Exhaus t Valv e Dimension s
A Standar d (New) : 28. 9 - 29. 1 m m
(1.14-1.1 5 in )
B Standar d (New) : 123.1 5 - 123.4 5 m m
(4.84 8 - 4.86 0 in )
C Standar d (New) : 5.45 0 - 5.46 0 m m
(0.2146-0.215 0 in )
C Servic e Limit : 5.42 0 m m (0.213 4 in )
D Standar d (New) : 1.5 5 - 1.8 5 m m
(0.06 1 - 0.07 3 in )
D Servic e Limit : 1.3 5 m m (0.05 3 in )
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Cylinder Hea d
Warpag e
NOTE: I f th e camshaft-to-holde r oi l clearanc e (se e
pag e 6-22 ) i s no t withi n specifications , th e cylinde r hea d
canno t b e resurfaced .
I f th e camshaft-to-holde r oi l clearanc e i s withi n specifi -
cations , 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 ) cylin -
de 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 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 cen -
ter.
Cylinde r Hea d Height :
Standar d (New) : 99.9 5 - 100.0 5 m m
(3.93 5 - 3.93 9 in )
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Valve Guides

Valve Movement

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

tor while rocking the stem in the direction of normal

thrust (wobble method).

Intake Valve Stem-to-Guide Clearance:

Standard (New): 0.04 - 0.09 mm

(0.002 - 0.004 in)

Service Limit: 0.15 mm (0.006 in)

Exhaust Valve Stem-to-Guide Clearance:

Standard (New): 0.10 - 0.16 mm

(0.004 - 0.006 in)

Service Limit: 0.20 mm (0.008 in)

Valve extended 10 mm out from seat.

If
measurement exceeds
the
service
limit,

recheck using a new valve.

If measurement is now within the service limit,

reassemble using a new valve.

If measurement still exceeds limit, recheck using

alternate method in the next column, then replace

valve and guide, if necessary.
NOTE: An alternate method of checking guide to

stem clearance is to subtract the O.D. of the valve

stem, measured with a micrometer, from the I.D. of

the valve guide, measured with an inside microme-

ter or ball gauge. Take the measurements in three

places along the valve stem and three places inside

the valve guide. The difference between the largest

guide measurement and the smallest stem mea-

surement should not exceed the service limit.

Intake Valve Stem-to-Guide Clearance:

Standard (New): 0.020 - 0.045 mm

(0.0008-0.0018 in)

Service Limit: 0.075 mm (0.0030 in)

Exhaust Valve Stem-to-Guide Clearance:

Standard (New): 0.05 - 0.08 mm

(0.002 - 0.003 in)

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

Valve Seat s
Reconditionin g
1.
2 .
3.
4 .
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 6-27 ),
replac e the m (se e pag e 6-29 ) befor e cuttin g th e
valv e seats .
VALV E SEA TCUTTE R(Commerciall yavailable)
Carefully cu t a 45 ° seat , removin g onl y enoug h mate -
ria 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
and 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) : 1.2 5 - 1.5 5 m m
(0.04 9 - 0.06 1 in )
Servic e Limit : 2.0 0 m m (0.07 9 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 L
SEATIN G
SURFAC 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 i t
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 48.74 5 - 49.21 5 m m
(1.9191-1.937 6 in )
Exhaus t 51.31 5 - 51.78 5 m m
(2.020 3 - 2.038 8 in )
Servic e Limit : Intak e 49.46 5 m m (1.947 4 in )
Exhaus t 52.03 5 m m (2.048 6 in )
VALV E STE M
INSTALLE D HEIGH T
If th e 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 it s stil l ove r
th e servic 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 .
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Valve Guide s
Replacemen t
I
As illustrate d below , us e a commercially-availabl e
air-impact valv e guid e drive r attachmen t modifie d
to 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
tool an d a conventiona l hammer .
VALVE GUID E DRIVE R(Commerciall y available )
or
VALV E GUID E DRIVER , 5. 5 m m
07742-001010 0
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 30 0 F (15 0 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.
5.
Workin g fro m th e camshaf t side , us e th e drive r an d
an ai r hamme r t o driv e th e guid e abou t 2 m m (0. 1 in )
towards the 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 t o preven t damagin g th e driver .
Tur n th e hea d over , an d driv e th e guid e ou t towar d
th e camshaf t sid e o f head .
VALV E GUID E DRIVER ,5.5 m m07742-001010 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 i n 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 .
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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
of th e 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 2 0 guide s t o do , yo u ma y hav e to rehea t
th e head .
VALV E GUID EDRIVER , 5. 5 m m07742-001010 0
Valve Guid e Installe d Height :
Intake : 24.7 5 - 25.2 5 m m (0.97 4 - 0.99 4 in )
Exhaust : 16.0 5 - 16.5 5 m m (0.63 2 - 0.65 2 in )
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Valve Guide s
Reamin g
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 .
3 . Continu e t o rotat e th e reame r clockwis e whil e remov -
in 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 6-27 ).
— Verif y tha t th e valv e slide s i n th e valv e guid e
withou t exertin g pressure .
VALVE GUID E
REAMER , 5. 5 m m
07HA H - PJ7010 B
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Valves, Valve Springs and Valve Seals

Installation Sequence

NOTE: Exhaust and intake valve seals are NOT interchangeable.

VALVE SPRING

NOTE: Place the closely wound

end of the valve spring

toward the cylinder head.
VALVE KEEPERS

VALVE SPRING

RETAINER

EXHAUST VALVE SEAL

(BLACK SPRING)

Replace.

INTAKE VALVE SEAL

(WHITE SPRING)

Replace.

SPRING SEAT

NOTE: Install the valve spring seats

before installing the valve seals.

VALVE GUIDE SEAL INSTALLER

KD - 2899

(Commercially available)

NOTE: Use small I.D.

end of tool.

VALVE SEAL

Replace.ProCarManuals.com