Dodge RAM TRUCK 1500 1995 Service Manual page 846

9 - 2 ENGINES
B R
(0.12 inch) in diameter. All mounting holes must be
circled. For comer sealing, a 8 or 6 mm (1/8 or 1/4
inch) drop is placed in the center of the gasket con­
tact area. Uncured sealant may be removed with a
shop towel. Components should be torqued in place
while the sealant is still wet to the touch (within 10
minutes). The use of a locating dowel is recom­
mended during assembly to prevent smearing the
material off location.
Mopar® Gasket Maker should be applied sparingly
to one gasket surface. The sealant diameter should
be 1.00 mm (0.04 inch) or less. Be certain the mate­
rial surrounds each mounting hole. Excess material
can easily be wiped off. Components should be
torqued in place within 15 minutes. The use of a lo­
cating dowel is recommended during assembly to pre­
vent smearing the material off location.
ENGINE PERFORMANCE—GASOLINE ENGINES
lb provide best vehicle performance and lowest ve­
hicle emissions, it is most important that the tune-up
be done accurately. Use the specifications listed on
the Vehicle Emission Control Information label found
on the engine compartment hood.
(1) Test cranking amperage draw (refer to Group
8B, Battery/Starter/Generator Service for the proper
procedures).
(2) Tighten the intake manifold bolts (refer to
Group 11, Exhaust System and Intake Manifold for
the proper specifications).
(3) Perform cylinder compression test:
(a) Check engine oil level and add oil, if neces­
sary.
(b) Drive the vehicle until engine reaches normal
operating temperature.
(c) Select a route free from traffic and other
forms of congestion, observe all traffic laws and
briskly accelerate through the gears several times.
The higher engine speed may help clean out valve
seat deposits which can prevent accurate compres­
sion readings.
CAUTION: DO NOT overspeed the engine.
(d) Remove all spark plugs from engine. As spark
plugs are being removed, check electrodes for ab­
normal firing indicators—fouled, hot, oily, etc.
Record cylinder number of spark plug for future
reference.
(e) Disconnect coil wire from distributor or from
both coil packs (V-10) and secure to good ground to
prevent a spark from starting a fire.
(f) Be sure throttle blades are fully open during
the compression check.
(g) Insert compression gage adaptor into the
No.l spark plug hole. Crank engine until maximum
pressure is reached on gauge. Record this pressure
as No.l cylinder pressure.
(h) Repeat Step 3g for all remaining cylinders.
(i) Compression should not be less than 689 kPa
(100 psi) and not vary more than 172 kPa (25 psi)
from cylinder to cylinder.
(j) If cylinder(s) have abnormally low compres­
sion pressures, repeat steps 3a through 3h.
(k) If the same cylinder(s) repeat an abnormally
low reading, it could indicate the existence of a
problem in the cylinder.
The recommended compression pressures are
to be used only as a guide to diagnosing engine
problems. An engine should NOT be disassem­
bled to determine the cause of low compression
unless some malfunction is present.
(4) Clean or replace spark plugs as necessary. Ad­
just gap (refer to Group 8D, Ignition System for gap
adjustment and torque).
(5) Test resistance of spark plug cables (refer to
Group 8D, Ignition System).
(6) Inspect the primary wire. Test coil output volt­
age, primary and secondary resistance. Replace parts
as necessary (refer to Group 8D, Ignition System and
make necessary adjustment).
(7) Set ignition timing to specifications (refer to
Specification Label on engine compartment hood).
This step does not apply to 8.0L engine.
(8) Perform a combustion analysis.
(9) Test fuel pump for pressure and vacuum (refer
to Group 14, Fuel System for the proper specifica­
tions).
(10) Inspect air filter element (refer to Group 0,
Lubrication and Maintenance for the proper proce­
dure).
(11) Inspect crankcase ventilation system (refer to
Group 0, Lubrication and Maintenance for the proper
procedure).
(12) For emission controls, refer to Group 25,
Emission Controls System for service procedures.
(13) Inspect and adjust accessory belt drives (refer
to Group 7, Cooling System for the proper adjust­
ments).
(14) Road test vehicle as a final test.
HONING CYLINDER BORES
Before honing, stuff plenty of clean shop towels un­
der the bores and over the crankshaft to keep abra­
sive materials from entering the crankshaft area.
(1) Used carefully, the Cylinder Bore Sizing Hone
C-823 equipped with 220 grit stones, is the best tool
for this job. In addition to deglazing, it will reduce
taper and out-of-round as well as removing light
scuffing, scoring or scratches. Usually a few strokes
will clean up a bore and maintain the required lim­
its.
CAUTION: DO NOT use- rigid type hones to remove
cylinder wall glaze.