Warpage - Honda Prelude 1993 Service Manual

Cylinder Head
Warpage
NOTE: lf camshaft-to-holder oil clearances (page 649)
are not within specitication, the cylinder head cannot be
resurfaced.
lf camshaft-to-holder oil clearances are within specifica-
tions, check the cylinder head lor warpage
. lf warpage is lessthan 0'05 mm (0.0O2 in)cylinder head
resurfacing is not requar€d
. lf wsrpage is b€tw6€n O.05 mm {0.0O2 in) 8nd 0.2
mm (0.008 in), rosurface cylinder head.
. Maximum resurface limit is 0.2 mm (0.OO8 in) based on
a height of 132.o mm (5.20 in)
M€ssuro along gdggg. and 3 ways across center'
Cyllrdor H6ad H€ight:
Stardard (Nowl: 131 .95- 132.05 mm
1 5 . 1 9 5 - 5 . 1 9 9 i n l
Valve Movement
Measure the guide-to-stem clearance with € dial indicstor
while rocking the stem in the direction of normsl thrust
(wobble method).
lntsko Vdvo St.m-to{iukla Clearance:
Standard (New): 0.04-0' 10 mm
{0'002-0.0O4 in)
Sewlca Umh:
O.16 mm (0.006 in)
Exha6t Valve Stom-to4ulde Clearanca:
Standrd lNow): O.10-0.16 mm
(O'0O4-O.006 in)
Sowic. Limh:
0 22 mm (0.OO9 in)
a lf measuremant exce€ds the service limit, r8check
using a new valvs.
a lf measurement is now within the servic€ limit.
reassemble using a ngw valv€.
a lf measurement still excaads limit, recheck using
alternate m€thod b€low, then replace vslve snd
guide, if necessary,
NOTE: An altsrnate m€thod of ch€cking guide to
stem clearance is to subtract the O.D. of ths valve
stem, measurgd with a micrometer. from the l.D. ot
the valve guide, measured with an inside microme-
ter o. ball gauge.
Take the measurements in three places along the
valve stem and three places inside the valve guide.
The difference betwesn the largest guide measure-
ment and the smallest stem measurement should not
exceed the service limit.
Intake Valvo Stom-tecuida Closrsnca:
Stardtd lt{rw}: 0.02-0.05 mm
(O.OOl -O.OO2 in)
Servba Limit:
O.08 mm (O.0O3 in)
Erhaust Valw Stom-to4uidc Cbarancs:
Stsrdrd (ltlew): O.05-O.O8 mm
(O.OO2-0.OO3 inl
Servlcc Limit:
O.1 1 mm (O.0O4 in)
Valve Guides
..
.o
1O mm out trom s€at.
6-52