Valves And Valve Springs; Valve Inspection; Compress Valve Springs With Tool C-3422A; Positioning Valve With Tool C-3973 - Dodge D150 1990 Service Manual

VALVES AND VALVE SPRINGS
The valves are arranged i n l i n e a n d inclined 18°.
The rocker shaft support a n d t h e valve guides are
cast i n t e g r a l w i t h the heads.
REMOVAL
(1) W i t h cylinder head removed, compress valve
springs using Tool C-3422-A (Fig. 9).
(2) Remove valve r e t a i n i n g locks, valve spring re-
tainers, valve stem cup seals and valve springs.
(3) Before r e m o v i n g valves, remove any burrs f r o m
valve stem lock grooves t o prevent damage t o t h e
valve guides. Identify valves t o ensure i n s t a l l a t i o n i n
o r i g i n a l location.
Fig. 9 Compress Valve Springs with Tool C-3422A
VALVE INSPECTION
Clean valves t h o r o u g h l y a n d discard burned,
warped and cracked valves.
Measure valve stems for wear. N e w stem diameters
should measure (Fig. 10):
Intake . . . 9.449 to 9.474 mm
(0.372 to 0.373 inch)
. . 9.423 to 9.449 mm
(0.371 to 0.372 inch)
If wear exceeds 0.051 mm
(0.002 inch), replace valve
J9009-109
Fig. 10 Valve Stem Diameters
Remove carbon and v a r n i s h deposits f r o m inside o f
valve guides w i t h a reliable guide cleaner.
Measure valve stem guide clearance as follows:
(a) I n s t a l l sleeve Tool C-3973 over valve stem
a n d i n s t a l l valve ( F i g . 11). T h e special sleeve
places t h e valve a t the correct height for checking
w i t h a d i a l indicator.
Fig. 11 Positioning Valve with Tool C-3973
(b) A t t a c h d i a l indicator Tool C-3339 to c y l i n -
der head and set i t a t r i g h t angle of valve stem be-
i n g measured (Fig. 12).
Fig. 12 Measuring Valve Guide Wear
(c) Move valve to and from the indicator. T h e
t o t a l d i a l indicator r e a d i n g should not exceed 0.432
m m (0.017 inch). Ream t h e guides for valves w i t h
oversize stems i f dial indicator reading is excessive
or i f the stems are scuffed or scored.
Service valves w i t h oversize stems are available
(Fig. 13).
Slowly t u r n reamer b y h a n d and clean guide thor-
oughly before i n s t a l l i n g n e w valve.
CAUTION: DO NOT attempt to ream the valve
guides from standard directly to 0.762 mm (0.030
inch). Use step procedure of 0.127, 0.381 and 0.762
mm (0.005, 0.015 and 0.030 inch) so the valve
guides may be reamed true in relation to the valve
seat.