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
Disassembly and Assembly
3500B Engines
Media Number -SENR6564-23 Publication Date -01/03/2014 Date Updated -10/03/2014
i06002514
Rocker Shaft and Push Rods - Install
SMCS - 1202
Installation Procedure
NOTICE
Keep all parts clean from contaminants.
Contaminants may cause rapid wear and shortened component life.
Note: For installing valve bridges with a dowel refer to Step1 through Step 4. For Installing floating
bridge assemblies refer to Step 5 through Step 6.
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Illustration 1 g01051014
1. Loosen adjustment screw (7) and jam nut (8) on the bridge assembly.
2. Coat these items with clean engine oil: dowels (4) , the receptacle of the bridge for the dowels and
the uppermost contact surface of bridge assembly (3) .
3. Place the bridge assembly into position on the dowel. Apply 1 to 14 N·m (1 to 10 lb ft) of
downward force on the uppermost contact surface of bridge assembly (3) . While you apply the
force, turn adjustment screw (7) until the screw contacts valve stem (9) .
Turn the adjustment screw for an additional 20 to 30 degrees (1/3 to 1/2 of the hex). This will
straighten the dowel in the guide. This will also compensate for a lack of clearance (slack) in the
threads.
Note: The bridges should be oriented so that the bridge marked "EX" is above the exhaust valves.
The part numbers on the bridges should face the front of the engine.
4. Hold the adjustment screw in position and tighten jam nut (8) to a torque of 30 ± 4 N·m (22 ± 3 lb
ft).
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Illustration 2 g01946786
Floating valve bridge
(X) Round pocket
(Y) Slotted pocket
(Z) Outside of engine
5. Apply clean engine oil to the contact surface of bridge assemblies (3) and the valve stems. Install
bridge assemblies (3) on the valve stems.
6. Install the bridge assemblies with the round pocket toward the outside of the engine. Refer to
Illustration 2.
Note: Installing each pushrod in the original location is critical.
7. Coat pushrods (5) and the cups of the valve lifters (6) with clean engine oil. Place the pushrods
into position on the valve lifters.
NOTICE
Ensure that the crankshaft and the camshafts are in time with each
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other. Also ensure that the adjustment screws in the rocker arms are
loosened completely before the bolts on the rocker shaft are tightened
or damage to the valves and the pistons may occur.
Illustration 3 g01051017
NOTICE
If the rocker shaft is not positioned correctly, the oil supply to the
sleeve bearings in the rocker arm will be shut off. This will cause
seizure of the bearings and severe damage to the engine.
Be sure to orient the rocker shaft in the correct position.
8. Place rocker shaft assembly (2) in position on the rocker arm base. Make sure that rocker arms
(10) and pushrods (5) are aligned. Install bolts (1) . Tighten the bolts to a torque of 215 ± 40 N·m
(159 ± 30 lb ft).
9. Adjust the valve bridge and the valve lash according to Testing and Adjusting, "Valve Lash and
Valve Bridge Adjustment".
10. Adjust the fuel injection pump according to Testing and Adjusting, "Fuel Injector Adjustment".
11. Tighten nuts (12) to a torque of 70 ± 15 N·m (52 ± 11 lb ft).
12. Tighten nut (11) for the rocker arm of the fuel injection pump to a torque of 120 ± 15 N·m (89 ±
11 lb ft).
End By: Install the valve covers. Refer to Disassembly and Assembly, "Valve Cover - Remove and
Install".
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