Engine 2.4L; Diagnosis And Testing; Diagnosis And Testing - Cylinder - Chrysler Vehicle User Manual

TJ
TIMING BELT TENSIONER & PULLEY
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 60
BALANCE SHAFT
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 61
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
INSTALLATION
BALANCE SHAFT TIMING

ENGINE 2.4L

DESCRIPTION
The 2.4 Liter (148 cu. in.) in-line four cylinder
engine is a double over head camshaft with hydraulic
lifters and four valve per cylinder design. The engine
is free-wheeling; meaning it has provisions for piston-
to-valve clearance. However valve-to-valve interfer-
ence can occur,
independently.
The cylinders are numbered from front of the
engine to the rear. The firing order is 1-3-4-2.
The engine identification number is located on the
rear of the cylinder block (Fig. 1).
Fig. 1 ENGINE IDENTIFICATION
1 - ENGINE IDENTIFICATION

DIAGNOSIS AND TESTING

DIAGNOSIS AND TESTING - CYLINDER

COMBUSTION PRESSURE LEAKAGE TEST
The combustion pressure leakage test provides an
accurate means for determining engine condition.
Combustion pressure leakage testing will detect:
. . . . . . . . . . . . . . . 63
if camshafts are
BALANCE SHAFT CARRIER
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
INSTALLATION
BALANCE SHAFT CHAIN
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
INSTALLATION
• Exhaust and intake valve leaks (improper seat-
ing).
• Leaks between adjacent cylinders or into water
jacket.
• Any causes for combustion/compression pressure
loss.
WARNING: DO NOT REMOVE THE PRESSURE CAP
WITH THE SYSTEM HOT AND UNDER PRESSURE
rotated
BECAUSE SERIOUS BURNS FROM COOLANT CAN
OCCUR.
Check the coolant level and fill as required. DO
NOT install the pressure cap.
Start and operate the engine until it attains nor-
mal operating temperature, then turn the engine
OFF.
Clean spark plug recesses with compressed air.
Remove the spark plugs.
Remove the oil filler cap.
Remove the air cleaner.
Calibrate the tester according to the manufactur-
er's instructions. The shop air source for testing
should maintain 483 kPa (70 psi) minimum, 1,379
kPa (200 psi) maximum, with 552 kPa (80 psi) rec-
ommended.
Perform the test procedures on each cylinder
according to the tester manufacturer's instructions.
While testing, listen for pressurized air escaping
through the throttle body, tailpipe and oil filler cap
opening. Check for bubbles in the coolant.
All gauge pressure indications should be equal,
with no more than 25% leakage per cylinder.
FOR EXAMPLE: At 552 kPa (80 psi) input pres-
sure, a minimum of 414 kPa (60 psi) should be main-
tained in the cylinder.
DIAGNOSIS AND TESTING - CYLINDER
COMPRESSION PRESSURE TEST
The results of a cylinder compression pressure test
can be utilized to diagnose several engine malfunc-
tions.
Ensure the battery is completely charged and the
engine starter motor is in good operating condition.
Otherwise the indicated compression pressures may
not be valid for diagnosis purposes.
(1) Check engine oil level and add oil if necessary.
ENGINE 2.4L
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