From FCA Workshop
DIAGNOSIS AND TESTING > CYLINDER COMPRESSION TEST
Fig 1: Fuel Injector Clamp, Compression Test Adapter & Bolt
Courtesy of CHRYSLER GROUP, LLC
1. Warm up engine to operating temperature (approximately 80 °C, 176 °F).
2. Shut the engine off.
3. Disable the low pressure fuel pump.
4. Remove the fuel injector. Refer to INJECTOR(S), FUEL, REMOVAL .
Crank the engine several times with the starter to eliminate combustion residues in the
cylinders.
5.
Insert the (special tool #VM.10357, Adapter, Compression Test) (3) into fuel injector hole of
cylinder to be tested. Install fuel injector clamp (1), bolt (2) and securely tighten.
6.
Test compression pressure by cranking engine with starter for at least 8 revolutions.
7.
DESCRIPTION SPECIFICATION
Cylinder Compression 21 - 25 Bar (304 - 362 psi)
DIFFERENCE BETWEEN CYLINDERS
5 Bar (73 psi)
8. Carry out test procedure at the remaining cylinders in the same way.
9. Remove the (special tool #VM.10357, Adapter, Compression Test) from cylinder head.
10. Install the fuel injector. Refer to INJECTOR(S), FUEL, INSTALLATION .
DIAGNOSIS AND TESTING > CYLINDER LEAKAGE TEST
The cylinder leakage test provides an accurate means for determining engine condition.
Cylinder leakage testing will detect:
Exhaust and intake valve leaks (improper seating).
Leaks between adjacent cylinders or into water jacket.
1. Check the coolant level and fill as required. DO NOT install the radiator cap.
2. Start and operate the engine until it attains normal operating temperature.
3. Turn the engine OFF.
4. Remove the fuel injector. Refer to INJECTOR(S), FUEL, REMOVAL .
5. Set the piston of the cylinder to be tested at TDC on the compression stroke.
Install the (special tool #VM.10357, Adapter, Compression Test) into the fuel injector bore of
cylinder to be tested. Install fuel injector clamp, nut, and securely tighten.
6.
Calibrate the tester according to the manufacturer's instructions. The shop air source for
testing should maintain a regulated air pressure at 552 kPa (80 psi).
7.
Connect the leakage tester and perform the leakage test procedure on each cylinder according
to the tester manufacturer's instructions.
8.
As each cylinder is pressurized, listen for the air escaping through the EGR air flow control
valve, tailpipe, and the oil filler cap opening. Check for bubbles in the pressurized coolant
bottle.
9.
10. All gauge pressure indications should be equal, with no more than 25% leakage.
If leakage is greater then 25%, refer to CYLINDER LEAKAGE DIAGNOSIS CHART below.
CYLINDER LEAKAGE DIAGNOSIS CHART
CONDITION POSSIBLE CAUSE CORRECTION
AIR ESCAPES THROUGH
THROTTLE BODY
Intake valve bent, burnt, or
not seated properly.
Inspect valve and valve seat.
Reface or replace, as
necessary. Inspect valve
springs. Replace as necessary.
11.
AIR ESCAPES THROUGH
TAILPIPE
Exhaust valve bent, burnt, or
not seated properly.
Inspect valve and valve seat.
Reface or replace, as
necessary. Inspect valve
springs. Replace as necessary.
AIR ESCAPES THROUGH
RADIATOR
Head gasket leaking or
cracked cylinder head or
block.
Remove cylinder head and
inspect. Replace the defective
part.
MORE THAN 50% LEAKAGE
FROM ADJACENT
CYLINDERS
Head gasket leaking or crack
in cylinder head or block
between adjacent cylinders.
Remove cylinder head and
inspect. Replace gasket, head,
or block as necessary.
MORE THAN 25% LEAKAGE
AND AIR ESCAPES
THROUGH OIL FILLER CAP
OPENING ONLY
Stuck or broken piston rings;
cracked piston; worn rings
and/or cylinder wall.
Inspect for broken rings or
piston. Measure ring gap and
cylinder diameter, taper and
out-of-round. Replace defective
part as necessary
__________________
MY16 GC WK2
Last edited by OLMATE; 19-06-2023 at 06:36 PM.
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