3512B High Displacement Generator Set Engine 5AW00001-UP(SEBP2978 - 61) - Docu...
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Product: GEN SET ENGINE
Model: 3512B GEN SET ENGINE 5AW
Configuration: 3512B High Displacement Generator Set Engine 5AW00001-
UP
Testing and Adjusting
3500B High Displacement Engines
Media Number -RENR2297-03 Publication Date -01/05/2007 Date Updated -14/05/2007
i02013998
Valve Lash and Valve Bridge Adjustment
SMCS - 1102-036
Illustration 1 g00286271
(1) 147-2060 Wrench
(2) 147-2059 Torque Wrench
(3) 148-7211 Bridge Nut Socket
(4) 145-5191 Gauge Support
(5) 147-2056 Dial Indicator
(6) 147-5536 Indicator Contact Point
(7) 147-2057 Indicator Contact Point
(8) 147-2058 Indicator Extension
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Table 1
Tools Needed Quantity
147-2060 Wrench 1
147-2059 Torque Wrench 1
148-7211 Bridge Nut Socket 1
145-5191 Gauge Support 1
147-2056 Dial Indicator 1
147-5536 Indicator Contact Point 1
147-2057 Indicator Contact Point 1
147-2058 Indicator Extension 1
147-5537 Dial Indicator (not shown) 1
Note: The 145-5191 Gauge Support (4), the 147-2057 Indicator Contact Point (7), the 147-2058
Indicator Extension (8), and the 147-5536 Indicator Contact Point (6) are included in the 147-5482
Valve Lash Gauge Group .
Note: The 147-2056 Dial Indicator or the 147-5537 Dial Indicator (Metric, not shown) can be used with
the 147-5482 Valve Lash Gauge Group .
There are two different design of valve bridges that are used. If the engine is equipped with an
adjustable valve bridge (Illustration 2), proceed to the "Valve Bridge Adjustment". If the engine is
equipped with a nonadjustable valve bridge (Illustration 3), proceed to the "Valve Lash Adjustment".
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Illustration 2 g01034327
Adjustable valve bridge
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Illustration 3 g01034328
Nonadjustable valve bridge
Valve Bridge Adjustment
The Electronic Control Module produces high voltage. To prevent
personal injury make sure the Electronic Control Module is not
powered and do not come in contact with the fuel injector solenoid
terminals while the engine is running.
Note: When the 147-5482 Valve Lash Gauge Group is used, it is not necessary for you to remove the
rocker arm shaft assemblies. The valves must be fully closed when the adjustment is made. Refer to
Testing and Adjusting, "Finding the Top Center Position for the No. 1 Piston".
Installation
1. Assemble the 147-2058 Indicator Extension and the 147-5536 Indicator Contact Point on the 147-
2056 Dial Indicator or on the 147-5537 Dial Indicator .
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Illustration 4 g00286279
145-5191 Gauge Support
(1) Knurled knob
Illustration 5 g00286280
(2) Valve cover base rear bolt hole
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Illustration 6 g00286281
(3) 147-5536 Indicator Contact Point
(4) Top edge of the valve bridge
2. Install the 145-5191 Gauge Support in the rear bolt hole (2). The rear bolt hole is located in the
valve cover base. Adjust contact point (3) on the top edge of valve bridge (4) .
Illustration 7 g00286283
(5) Adjustment screw
3. Loosen the locknut for the adjustment screw. Loosen the adjustment screw (5) by several turns.
4. Apply a force of 5 N (1 lb) to 45 N (10 lb). Push down on the top contact surface of the valve
bridge. Zero the indicator.
5. Turn adjustment screw (5) in the clockwise direction until the dial indicator reads 0.038 mm
(0.0015 inch). This measurement is equal to turning the adjustment screw 20 to 30 degrees
clockwise after the screw contacts the end of the valve.
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Illustration 8 g00286364
(6) 148-7211 Bridge Nut Socket
6. Hold the adjustment screw with the 148-7211 Bridge Nut Socket (6) in order to tighten the
locknut to 30 ± 4 N·m (22 ± 3 lb ft). You may use a sliderule torque computer in order to
determine the torque wrench dial reading for the different extensions. Refer to Special Instruction,
SEHS7150, "Snap On Torque Computer".
Valve Lash Adjustment
The Electronic Control Module produces high voltage. To prevent
personal injury make sure the Electronic Control Module is not
powered and do not come in contact with the fuel injector solenoid
terminals while the engine is running.
Note: Adjust the valve bridges before you make the valve lash adjustments.
Table 2
Valve Lash Setting: Engine Stopped
Valves Gauge Dimension
Inlet
0.50 mm (0.020 inch)
Exhaust
1.00 mm (0.040 inch)
1. Ensure that the number 1 piston is at the top center position. Refer to Testing and Adjusting,
"Finding the Top Center Position for the No. 1 Piston".
2. The number 1 piston should be at the top center position of the correct stroke. Make adjustments
to the valves according to the chart: Refer to Testing and Adjusting, "Crankshaft Positions for
Fuel Injector Adjustment and Valve Lash Setting".
Note: Tap each rocker arm on the top of the adjustment screw before you make any adjustments.
Use a soft hammer. Make sure that the lifter roller is seated against the base circle of the camshaft.
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Illustration 9 g00286365
(1) 145-5191 Gauge Support
(2) 147-2057 Indicator Contact Point
3. Install the 145-5191 Gauge Support (1). Use the 147-2056 Dial Indicator or use the 147-5537 Dial
Indicator. Use the 147-2057 Indicator Contact Point (2). Install the tool in the rear bolt hole. The
rear bolt hole is located on the valve cover base.
Illustration 10 g00286366
(3) 147-2060 Wrench
(4) 147-2059 Torque Wrench
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Illustration 11 g00286367
(3) 147-2060 Wrench
(4) 147-2059 Torque Wrench
4. Move the rocker assembly upward and move the rocker arm assembly downward. Move the
rocker assembly several times. The oil film is removed in order to get a true zero reading on the
dial indicator. Use the 147-2060 Wrench (3) and use the 147-2059 Torque Wrench (4). Install the
socket wrench and install the torque wrench on the nut of the rocker arm. Apply upward pressure
to the front of the rocker assembly. Set the dial indicator to zero. The weight of the torque wrench
(4) allows the valve lash to be read. Do not apply any pressure on the torque wrench.
5. Loosen the locknut. The locknut is located on the adjustment screw of the pushrod. Turn the
adjustment screw until the valve lash is set to specifications. Tighten the nut for the adjustment
screw to 70 ± 15 N·m (50 ± 11 lb ft ). The 147-2059 Torque Wrench is preset to the torque that is
required. Check the adjustment again.
Copyright 1993 - 2014 Caterpillar Inc. Wed Feb 19 09:59:50 UTC+0400 2014
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