Valve Guides; Valve Movement - Honda Prelude 1993 Service Manual

Cylinder Head
Warpage
NOTE: lf camshaft-to-holder oil clesrance {page 6-14) are
not within specitication, the cylinder head cannot be
resurfaced.
lf camshaft-to-holder oil clearances are within specitica-
tions. check the cvlinder head for warpage.
. lf warpage is less than O.05 mm {0.OO2 in)cylinder head
resurfacing is not .equired.
. lf warpage is between O.O5 mm (O.0O2 in) and 0.2 mm
(0.008 in), resurtace crinder head.
a Maximum resurface limit is 0.2 mm {0.008 in) based on
a height of 10O mm {3.94 in).
Measure along edges, and 3 ways across center.
Cyfnd€r Hoad Hoight:
Strdard lNew): 99.95- 1o0.O5 mm
(3.935- 3.939 in)
Valve Movement
Measure the guide-to-stem clearance with a dial indicator
while rocking the stem in the direclion ol normal thrust
(wobble methodl.
lntako Valve Stem-to4ulde Clearanca:
Standrd {New}: 0.04-O.O9 mm
(O.OO2-0.OO4 inl
Service Limh:
0 16 mm (0.006 in)
Exhaust Valve Stom'to4uite
Clea.ance:
Standard (New): 0.1 1 -0.16 mm
{0.0O4-0.0O6 in)
Sorvico Limit:
O.24 mm (0.OO9 in)
Valve extended 1O mm out from seat
a lf measurement exc€eds the service limit, recheck
using a new valve.
a l{ measurement is now within service limit, reas-
s€mble using a new valve,
a lf measurement still exceeds limit, recheck using al-
ternate method below. then replace valve and
guide, it necessary.
NOTE: An ahemate method oJ checking guide to
stem clearance is to subtract the O.D. ol the valve
stem, measured with a micrometer, from the l.D. of
the valve guide, measured with an inside micrometer
or ball gauge.
Takethe measurements inthree places along the valve
stem and three places inside the valve guide.
The difference between the largest gulde measure-
ment and the smallest stem measurement should not
exceed the service limit.
lntako Valvo Stom-to€ukle Clearance:
Standqd (Newl: 0.020-0.045 mm
(0.ooo8-o.oo18 in)
S€rvico Limit;
O.Og mm (O.OO3 in)
Exhaust Valvo St€m-to-Guide Clearancr:
Standcd (Newl: o.055-o.08o mm
(O.OO22-O'OO31 in)
Sorvica Limh:
0.1 2 mm {O.OO5 in}
PRECISION STRAIGHT EDGE
Valve Guides
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6 - 1 8