Dodge ram truck 3500 1996 Service Manual page 1142

9 - 152 8.0L ENGINE B R
D I S A S S E M B L Y A N D A S S E M B L Y
VALVE SERVICE
VALVE GUIDES
Measure valve stem guide clearance as follows:
(1) Install Black Valve Guide Sleeve Tool C-6819
over valve stem for the INTAKE valve and install
valve (Fig. 57). The special sleeve places the valve at
the correct height for checking with a dial indicator.
(2) Install Silver Valve Guide Sleeve Tool C-6818
over valve stem for the EXHAUST valve and install
valve. The special sleeve places the valve at the cor­
rect height for checking with a dial indicator.
Fig. 57 Positioning Vaive Spacer Tool (Typical)
(3) Attach Dial Indicator Tool C-3339 to cylinder
head and set i t at right angle of valve stem being
measured (Fig. 58).
Fig. 58 Measuring Valve Guide Wear
(4) Move valve to and from the indicator. The total
dial indicator reading should not exceed 0.432 mm
(0.017 inch). Ream the guides for valves with over­
size stems i f dial indicator reading is excessive or i f
the stems are scuffed or scored.
Service valves with oversize stems are available
(Fig. 59).
Reamer O / S Valve Guide Size
0.076 mm 8.026 - 8.052 mm
(0.003 in.) (0.316-0.317 in.)
0.381 mm
8.331 -8.357 mm
(0.015 in.) (0.328-0.329 in.)
J9309-30
Fig. 59 Reamer Sizes
(5) Slowly turn reamer by hand and clean guide
thoroughly before installing new valve. Ream the
valve guides from standard to 0.381 mm (0.015
inch). Use a 2 step procedure so the valve
guides are reamed true in relation to the valve
seat:
• Step 1—Ream to 0.0763 mm (0.003 inch).
• Step 2—Ream to 0.381 mm (0.015 inch).
REFACING VALVES AMD VALVE SEATS
The intake and exhaust valves have a 45° face
angle and a 45° to 44 1/2° seat angle (Fig. 60).
CONTACT
POINT
A - SEAT WIDTH - INTAKE 1.016-1.524 mm (0.040-0.060 in.)
EXHAUST 1.016-1.524 mm (0.040-0.060 in.)
B - FACE A N G L E (INTAKE & EXHAUST)
C - SEAT ANGLE (INTAKE & EXHAUST)
D - CONTACT SURFACE
J9409-133
Fig. 60 Valve Face and Seat Angles
WALWES
Inspect the remaining margin after the valves are
refaced (Fig. 17). Valves with less than 1.190 mm
(0.047 inch) margin should be discarded.
WALWE SEATS
(1) When refacing valve seats, i t is important that
the correct size valve guide pilot be used for reseat-