Adjustment Of The Valve Lash And The Valve Bridge With The 147-5482 Valve Lash Gauge Group {1105, 1121} Caterpillar

Adjustment Of The Valve Lash And The Valve Bridge With The 147-5482 Valve Lash Gauge Group {1105, 1121}

Usage:

793B 1HL

Engines:: 3508 (S/N: 1ZF; 6TJ; 4ZL; 5TL; 8TL; 3HM; 5XM; 9WN; 3LS; 3PS; 3TS; 95Y; 96Y; 97Y; 23Z; 68Z; 69Z; 70Z); 3508B (S/N: 2BM; 3DM; 4GM; 7SM; 6PN; 5PS; 1TW; 2HW; 3DW); G3508 (S/N: 4WD; 2JF; 9TG; 2TJ; 9AW); 3512 (S/N: 3YF; 2WK; 5EL; 6FL; 1LM; 6PM; 4DR; 3MS; 3RS; 3WS; 49Y; 50Y; 51Y; 24Z; 65Z; 66Z; 67Z); 3512B (S/N: 7HM; 8EM; 8RM; 4TN; 6WN; 1PW; 2GW; 3ZW; 4AW; 5AW; 2EZ); G3512 (S/N: 4KC; 5JD; 7NJ; 6JW); 3516 (S/N: 4XF; 9KF; 4MJ; 5MJ; 5SJ; 6CL; 7CL; 7KM; 2TS; 3JS; 3NS; 3SS; 3XS; 25Z; 27Z; 28Z; 29Z; 71Z; 72Z; 73Z); 3516B (S/N: 6HN; 7RN; 8CN; 8KN; 9AN; 1NW; 2FW; 2JW; 3CW; 3EW; 4BW; 6HZ); G3516 (S/N: 3RC; 8LD; 4EK; 5PN; 8PW; 7EZ)
Excavator:: 5130 (PIN: 7TJ; 5ZL); 5130B (PIN: 4CS); 5230 (PIN: 7LL)
Generator Set:: 3508 (S/N: 5PW); 3508B (S/N: 5KW); 3512 (S/N: 6WW); 3512B (S/N: 6GW); 3516 (S/N: 8TW); 3516B (S/N: 8NW)
Off-Highway Tractor:: 776B (PIN: 6JC); 776C (PIN: 2TK); 776D (PIN: 5ER); 784B (PIN: 5RK)
Off-Highway Truck:: 777B (PIN: 4YC; 3NF); 777C (PIN: 4XJ); 777D (PIN: 3PR; 2YW); 783B (PIN: 8YM); 784C (PIN: 2PZ); 785 (PIN: 8GB); 785B (PIN: 6HK); 785C (PIN: 1HW); 787B (PIN: 9TM); 789 (PIN: 9ZC); 789B (PIN: 7EK); 789C (PIN: 2BW); 793 (PIN: 3SJ); 793B (PIN: 1HL); 793C (PIN: 4AR; 4GZ)
Track-Type Tractor:: D11N (PIN: 4HK; 74Z); D11R (PIN: 8ZR; 9TR; 9XR)
Wheel Loader:: 992G (PIN: 7HR); 994 (PIN: 9YF); 994D (PIN: 3TZ); 994G (PIN: 8FR)
Wheel Tractor:: 854G (PIN: 1JW)

Introduction

The entire Special Instruction should be read and understood before beginning any work on the engine.

Tools Needed

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Illustration 1	g00286271
147-5482 Valve Lash Gauge Group

(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
147-5537 Dial Indicator (not shown)

Note: The following items are included in the 147-5482 Valve Lash Gauge Group : 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) .

Note: The 147-2056 Dial Indicator or the 147-5537 Dial Indicator (not shown) can be used with the 147-5482 Valve Lash Gauge Group .

Valve Bridge Adjustment

Note: When you are using the 147-5482 Valve Lash Gauge Group , 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 Systems Operation, Testing And Adjusting, "Finding Top Center Position For No. 1 Piston" for additional information.

Installation

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 2	g00286279
145-5191 Gauge Support . (1) Knurled Knob.

Note: When you are using the 145-5191 Gauge Support in order to adjust the 3516 Diesel Engine that is installed in a 789 Off-Highway Truck, the knurled knob (1) must be removed on the tool. The knurled knob must be removed when you are measuring the valve lash on cylinder 5 and cylinder 12. The knurled knob must be removed due to the location of the oil lines from the turbocharger.

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Illustration 3	g00286280
(2) Rear bolt hole in the base of the cover

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Illustration 4	g00286281
(3) 147-5536 Indicator Contact Point . (4) Top edge of the valve bridge.

Install the 145-5191 Gauge Support in the rear bolt hole (2). The rear bolt hole is located in the valve cover base. Adjust the contact point (3) on the top edge of the valve bridge (4) .

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Illustration 5	g00286283
(5) Adjustment screw

Loosen the locknut for the adjustment screw. Loosen the adjustment screw (5) several turns.

Apply a force of 5 to 45 N (1 to 10 lb). Push down on the top contact surface of the valve bridge. Zero the indicator.

Turn the adjustment screw (5) clockwise until the dial indicator reads .038 mm (0.0015 inch). The correct measurement is equal to turning the adjustment screw 20 to 30 degrees after the screw contacts the end of the valve.

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Illustration 6	g00286364
(6) 148-7211 Bridge Nut Socket

Hold the adjustment screw with the 148-7211 Bridge Nut Socket (6) in order to tighten the locknut to 30 ± 4 N (22 ± 3 lb). You may use a torque computer in order to determine the torque wrench dial reading for the different extensions. Refer to the Special Instruction, SEHS7150, "Snap On Torque Computer" for additional information.

Valve Lash Adjustment

Note: The 147-5482 Valve Lash Gauge Group cannot be installed on engines with the earlier 8N-8788 Fuel Manifold .

Note: The valve bridges MUST be adjusted before making the valve lash adjustments.

Ensure that the number 1 piston is at the top center position. Refer to the Systems Operation, Testing And Adjusting, "Finding Top Center Position For No. 1 Piston" for additional information.

The number 1 piston should be at the top center position of the correct stroke. Make adjustments to the valves in accordance with the chart in the Systems Operation, Testing And Adjusting, "Crankshaft Positions For Fuel Injector Lash And Valve Lash Setting".
Note: Tap each rocker arm on the top of the adjustment screw before making any adjustments. Use a soft hammer. Make sure that the lifter roller is seated against the base circle of the camshaft.

Note: When you are using the 145-5191 Gauge Support to adjust the 3516 Diesel Engine that is installed in a 789 Off-Highway Truck, the knurled knob must be removed on the tool. The knurled knob must be removed when you are measuring the valve lash on cylinder 5 and cylinder 12. The knurled knob must be removed due to the location of the oil lines from the turbocharger.

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Illustration 7	g00286365
(1) 145-5191 Gauge Support . (2) 147-2057 Indicator Contact Point .

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.
Note: When you set the valve lash on gas engines that have a magneto, use the 147-2058 Indicator Extension . Use the 147-2057 Indicator Contact Point . Do not remove the spark plug extension.

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Illustration 8	g00286366
(3) 147-2060 Wrench . (4) 147-2059 Torque Wrench .

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Illustration 9	g00286367
(3) 147-2060 Wrench . (4) 147-2059 Torque Wrench .

Move the rocker assembly up and down several times. The oil film is removed in order to get a true zero reading on the dial indicator. Use both the 147-2060 Wrench (3) and the 147-2059 Torque Wrench (4). Attach the socket wrench and the torque wrench to 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.

Loosen the locknut. The locknut is located on the adjustment screw of the push rod. Turn the adjustment screw until the valve lash is set to specifications. Tighten the nut on the adjustment screw to a torque of 70 ± 15 N·m (52 ± 11 lb ft ). The 147-2059 Torque Wrench is preset to the torque that is required. Check the adjustment again.