Symptoms - Drive Belt - GMC chevrolet camaro 2000 Service Manual

Engine
Cylinder leakage Test
) Tools Required
J 35667-A Cylinder Leakdown Tester
With the use of air pressure, a cylinder leakage test
will aid in the diagnosis. The cylinder leakage test may
be used in conjunction with the engine compression
test, to isolate the cause of leaking cylinders.
Caution: Refer to Battery Disconnect Caution in
Cautions and Notices.
1. Remove the battery ground (negative) cable.
2. Remove the spark plugs. Refer to Ignition System.
3. Install the J 35667-A.
4. Measure each cylinder on the compression
stroke, with both valves closed.
309966
Important: It may be necessary to hold the crankshaft
balancer bolt, to prevent piston movement.
5. Apply air pressure, using the J 35667-A. Refer to
the manufacturer's instructions.
6. Record the cylinder leakage readings for each
cylinder.
Important:
• Normal cylinder leakage is from 12 to 18 percent.
" Make a note of any cylinder with more leakage
than the other cylinders.
.. Any cylinder with 30 percent leakage or more
requires service.
7. Inspect the four primary areas, to properly
diagnose a leaking cylinder.
8. If air is heard from the intake or exhaust system,
perform the following procedure:
" Remove the valve rocker arm cover of the
suspect cylinder head.
- Ensure that both valves are closed.
- Inspect the cylinder head for a broken valve
spring.
Engine Mechanical - 3.8L 6-31
• Remove the suspect cylinder head and
inspect. Refer to Cylinder Head Clean
and Inspect.
9. If air is heard from the crankcase system at the
crankcase (oil filler tube), perform the following
procedure:
• Remove the piston from the suspect cylinder.
• Inspect the piston and connecting rod
assembly. Refer to Piston, Connecting Rod,
and Bearings Clean and Inspect.
• Inspect the engine block. Refer to Engine
Block Clean and Inspect.
10. If bubbles are found in the radiator, perform the
following procedure: ·
• Remove both cylinder heads and inspect.
Refer to Cylinder Head Clean and Inspect.
• Inspect the engine block. Refer to Engine Block
Clean and Inspect.
11 . Remove the J 35667-A.
12. Install the spark plugs. Refer to Ignition System.
13. Install the battery ground (negative) cable. Refer to
Battery.
Symptoms - Drive Belt
Important: Review the drive belt system operation in
order to familiarize yourself with the system
functions. Refer to Drive Belt System Description.
Visual/Physical Inspection
• Inspect for aftermarket devices which could affect
the operation of the drive belts. ·
• Inspect the easily accessible or visible system
components for obvious damage or conditions
which could cause the symptom.
• Inspect the drive belt for excessive wear,
shredding, or missing sections.
" Inspect the drive belt for contamination of
excessive dirt, oil, coolant or other substances
that may affect the drive belt operation.
Intermittent
• Drive belt symptoms may be from intermittent
failure of an accessory drive component.
• Drive belt symptoms may occur from changes in
load of the accessory drive components.
• Ambient temperatures, moisture, or engine
operating temperature can affect the drive
belt operation .
Symptom List
Refer to a symptom diagnostic procedure from the
following list in order to diagnose the symptom:
• Drive Belt Chirping Diagnosis
• Drive Belt Squeal Diagnosis
• Drive Belt Whine Diagnosis
• Drive Belt Rumbling Diagnosis
• Drive Belt Vibration Diagnosis
• Drive Belt Faffs Off Diagnosis
• Drive Belt Excessive Wear Diagnosis