953D TRACK-TYPE LOADER LBP00001-UP (MACHINE) POWERED BY C6.6 Engi...
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Product: TRACK LOADER
Model: 953D TRACK LOADER LBP
Configuration: 953D TRACK-TYPE LOADER LBP00001-UP (MACHINE) POWERED BY C6.6 Engine
Testing and Adjusting
C6.6 Engines for Caterpillar Built Machines
Media Number -KENR5291-15 Publication Date -01/03/2014 Date Updated -04/03/2014
i02942190
Engine Valve Lash - Inspect/Adjust
SMCS - 1102-025
Table 1
Required Tools
Tool Part Number Part Description Qty
A 228-3610 Feeler gauge 1
Illustration 1 g01284058
Cylinder and valve location
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(A) Exhaust valve
(B) Inlet valve
If the valve lash requires adjustment several times in a short period of time, excessive wear exists in a
different part of the engine. Find the problem and make necessary repairs in order to prevent more
damage to the engine.
Not enough valve lash can be the cause of rapid wear of the camshaft and valve lifters. Not enough
valve lash can indicate that the seats for the valves are worn.
Valves become worn due to the following causes:
• Fuel injection nozzles that operate incorrectly
• Excessive dirt and oil are present on the filters for the inlet air.
• The load capacity of the engine is frequently exceeded.
Too much valve lash can cause broken valve stems, springs, and spring retainers. This will produce
emissions in excess of the correct specification.
Too much valve lash can be an indication of the following problems:
• Worn camshaft and valve lifters
• Worn rocker arms
• Bent pushrods
• Broken socket on the upper end of a pushrod
• Loose adjustment screw for the valve lash
If the camshaft and valve lifters show rapid wear, look for fuel in the lubrication oil or dirty
lubrication oil as a possible cause.
Valve Lash Check
An adjustment is not necessary if the measurement of the valve lash is in the acceptable range. Check
the valve lash while the engine is stopped. The temperature of the engine does not change the valve
lash setting.
If the measurement is not within the acceptable clearance, adjustment is necessary. Refer to "Valve
Lash Adjustment".
Valve Lash Adjustment
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NOTICE
It is very important to follow this valve lash adjustment procedure. Do
not use the traditional opposing cylinders method. Failure to follow the
correct procedure may result in serious engine damage.
Note: The procedure to adjust the engine valve lash for the C6.6 engine is different from conventional
engines, due to the altered valve opening and closing events.
Table 2
Inlet Valves Exhaust Valves
0.35 ± 0.05 mm (0.0138 ± 0.0020 inch)
Valve Lash 0.35 ± 0.05 mm (0.0138 ± 0.0020 inch)
Firing Order
1-5-3-6-2-4 (2)
(2)
The No. 1 Cylinder is at the front of the engine.
Note: For new engines, the valve lash should be checked and reset after the first 500 hours and after
the next 500 hours. The valve lash will then be checked at service intervals of 1000 hours.
Note: For example, if the pushrods in a remanufactured engine have been replaced with new parts
then adjust the valve lash to 0.25 ± 0.05 mm (0.0098 ± 0.0020 inch) for the initial rebuild. The valves
should be reset to 0.35 ± 0.05 mm (0.0138 ± 0.0020 inch) at the normal service intervals thereafter.
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Illustration 2 g01343876
Setting the valve lash
(A) Feeler gauge
(1) Adjustment screw
(2) Locking screw
Accidental engine starting can cause injury or death to personnel.
To prevent accidental engine starting, turn the ignition switch to the
OFF position and place a do not operate tag at the ignition switch
location.
Illustration 3 g01343879
1. Remove the valve mechanism cover. Refer to Disassembly and Assembly, "Valve Mechanism
Cover - Remove" for the removal procedure.
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Note: When the valve mechanism cover is removed or installed, the electrical harness must be
checked. Do not pinch the injector harness when the valve mechanism cover is installed. Do not
allow the harness to be in contact with the valve mechanism cover. Replace the harness, if the
harness is damaged.
Table 3
Set valve lash for the following :
Rotate the crankshaft until inlet valves are Inlet valves Exhaust valve
fully open. "(Cylinder "(Cylinder
number)" number)"
9 10
11
(5) (5)
5 6
3
(3) (3)
11 12
7
(6) (6)
3 4
1
(2) (2)
7 8
9
(4) (4)
1 2
5
(1) (1)
2. See Illustration 3. Rotate the crankshaft clockwise until the pair of inlet valves (11) is fully
open. Measure the valve lash on inlet valves (9) and exhaust valves (10) . If necessary, adjust
the valve lash to the settings in Table 2. Complete the sequence of checks according to Table 3
until all the cylinders have been checked or adjusted.
a. Loosen the valve adjustment screw locknut that is on the adjustment screw (1) .
b. Place Tooling (A) between the rocker arm and the valve. Turn the adjustment screw (1)
while the valve adjustment screw locknut (2) is being held from turning. Adjust the valve
lash until the correct specification is achieved.
c. After each adjustment, tighten the valve adjustment screw locknut while you hold the
valve adjustment screw (1) . This will prevent the valve adjustment screw (1) from
turning.
3. Complete the sequence of checks according to Table 3 until all the cylinders have been checked
or adjusted. Reinstall the valve mechanism cover. Refer to Disassembly and Assembly, "Valve
Mechanism Cover - Install" for the installation procedure.
Wed Nov 4 12:46:00 UTC+0800 2020
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