Mechanical Noise (Knock) In Engine - Perkins 1106D Troubleshooting Manual

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Troubleshooting Section
Low Compression (Cylinder Pressure)
1. Perform a compression test. Refer to Systems
Operation, Testing and Adjusting, "Compression
- Test ".
2. If low compression is noted on any cylinders,
investigate the cause and rectify any faults.
Possible causes of low compression are shown
in the following list:
•
Loose glow plugs
•
Faulty piston
•
Faulty piston rings
•
Worn cylinder bores
•
Worn valves
•
Faulty cylinder head gasket
•
Damaged cylinder head
3. Perform all necessary repairs.
4. Ensure that the repairs have eliminated the faults.
5. If the repair does not eliminate the fault refer to
"Electronic Unit Injectors".
Electronic Unit Injectors
1. With the engine speed at a fast idle, use the
electronic service tool to isolate one cylinder at
a time. Note if there is any reduction in engine
speed. If a reduction in engine speed is not noted,
the isolated electronic unit injector is not operating
under normal conditions. If the isolation of a
particular cylinder results in a reduction of engine
speed that is less than normal, this may indicate
that the electronic unit injector is operating below
normal performance.
2. Remove the electronic unit injector from the
suspect cylinder. Refer to Disassembly and
Assembly, "Electronic Unit Injector - Remove".
3. Install a new electronic unit injector. Refer to
Disassembly and Assembly, "Electronic Unit
Injector - Install".
4. Repeat the test in 1. If the fault is still apparent,
remove the replacement electronic unit injector
and install the original electronic unit injector.
Refer to Disassembly and Assembly, "Electronic
Unit Injector - Remove" and Disassembly and
Assembly, "Electronic Unit Injector - Install".
5. If the fault is not eliminated, proceed to "Individual
Malfunctioning Cylinders".
This document is printed from SPI². Not for RESALE
Individual Malfunctioning Cylinders
1. With the engine speed at a fast idle, use the
electronic service tool to isolate one cylinder at
a time. Note if there is any reduction in engine
speed. If a reduction in engine speed is not noted,
the isolated cylinder is not operating under normal
conditions. If the isolation of a particular cylinder
results in a reduction of engine speed that is less
than normal, this may indicate that the cylinder is
operating below normal performance. Investigate
the cause of the fault on any cylinder that is
not operating. Investigate the cause of the fault
on any cylinder that is operating below normal
performance.
Mechanical Noise (Knock) in
Engine
Probable Causes
•
Accessory equipment
•
Valve train components
•
Pistons
• Connecting rod and main bearings
Recommended Actions
Accessory Equipment
1. Isolate the source of the noise. Remove the
suspect engine accessory. Inspect the suspect
engine accessory. Repair the engine accessory
and/or replace the engine accessory if any defects
are found.
2. If the mechanical noise is still apparent, refer to
"Valve Train Components".
Valve Train Components
1. Remove the valve mechanism cover. Check
the following items for damage: camshaft, valve
springs, lifters, pushrods, and bridges. Thoroughly
clean the valve train components. If the camshaft
is being replaced, also replace the valve lifters.
Ensure that all of the valves move freely. Replace
any damaged parts.
2. If the mechanical noise is still apparent, refer to
"Pistons".
KENR6201-01
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