C8.7 Marine Engines Caterpillar

Rear Gear Group - Time

Usage:

C8.7 CS7

Specifications

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Table 1
Parameter	Value
Camshaft gear bolt torque	25 ± 1 N·m (18 ± 1 lb ft) plus 45 degrees
Rocker arm bolt torque	100 ± 10 N·m (75 ± 7 lb ft)
Timing wheel bolt torque	23 ± 2 N·m (17± 1 lb ft)

Introduction

Use this procedure to check and/or adjust the camshaft and flywheel timing.

Required Tools

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Table 2
Required Tools for Camshaft Timing
Qty	Part Number
1	456-7990 Timing Pin
1	456-7994 Engine Turning Tool

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Table 3
Required Tools for Flywheel Timing
Qty	Part Number
1	456-7990 Timing Pin
1	456-7994 Engine Turning Tool
	456-7997 Camshaft Timing Pin

Camshaft Timing Procedure

Reference.

Find the top center position for the number one piston. Refer to Testing and Adjusting, "Finding Top Center Position for No. 1 Piston".

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Illustration 1	g03710842
(1) 456-7990 Timing Pin

Install timing pin (1) into the flywheel.

Remove the camshaft gear cover.

Remove the camshaft speed timing sensor and camshaft timing wheel.

Remove the valve mechanism cover and loosen all of the rocker arm bolts.

Remove the camshaft gear, refer to Disassembly and Assembly, "Camshaft Gear Remove and Install".

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Illustration 2	g03836797
Typical example of the camshaft gear removed. Some parts have been removed for illustrative purposes. (2) Index hole

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Illustration 3	g03836805
(2) Index hole (3) Camshaft sealing plate

Check the orientation of index hole (2) as shown above.
If the index hole is in the proper orientation, proceed to Step 9.

If the index hole is not in proper orientation, rotate the camshaft in order to orientate the index hole as shown in Illustrations 2 and 3.

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Illustration 4	g03710937
(4) Camshaft gear (5) Bolts

Install the camshaft, tighten bolts (5) to 25 ± 1 N·m (18 ± 1 lb ft) and turn the bolts an additional 45 degrees.

Tighten all of the rocker arm bolts to 100 ± 10 N·m (75 ± 7 lb ft).

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Illustration 5	g03710965

Install a dial indicator on cylinder 3 exhaust rocker arm. Preload the dial indicator a minimum of 7 mm (0.28 inch).

Rotate the engine in a clockwise rotation until the dial indicator gauge reaches the minimum value possible.
Note: Ensure that the rocker arm remains in contact with the camshaft during the measurement.

Zero the dial indicator.

Rotate the engine in normal counter clockwise rotation until the dial indicator measures 4.70 ± 0.05 mm (0.19 ± 0.002 inch).

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Illustration 6	g03711096
(A) Double notch

Verify double notch (A) is visible from the inspection hole on the upper right-hand side of the flywheel housing and timing pin (1) can be inserted into the flywheel.
If the timing pin cannot be installed and/or double notch (A) is not visible, the camshaft timing must be adjusted. Proceed to Step 16.
If the camshaft is in time, proceed to Step 21.

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Illustration 7	g03710937
(4) Camshaft gear (5) Bolts

Loosen bolts (5) , rotate the engine using the turning tool in order to install the timing pin and align the double notches with the inspection hole on the upper right of the flywheel housing. Refer to Illustrations 1 and 9.

Tighten bolts (5) to 25 ± 1 N·m (18 ± 1 lb ft) and turn the bolts an additional 45 degrees.

Repeat Steps 12 through 17 until the timing pin can be installed and the double notch is visible through the inspection hole.

Install the camshaft timing wheel. Tighten the bolts to 23 ± 2 N·m (17± 1 lb ft).

Install the camshaft gear cover.

Set the valve lash, refer to Testing and Adjusting, "Engine Valve Lash - Inspect/Adjust".

Remove the timing pin and engine turning tool.

Flywheel Timing Check Procedure

Find the top center position for the number one piston. Refer to Testing and Adjusting, "Finding Top Center Position for No. 1 Piston".

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Illustration 8	g03710842
(1) 456-7990 Timing Pin

Install timing pin (1) into the flywheel.

Remove timing pin (1) and rotate the engine in reverse rotation a quarter of a turn.

Rotate the engine in normal counter clockwise rotation a quarter of a turn.

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Illustration 9	g03711096
(A) Double notch

Install timing pin (1) and verify double notch (A) is visible from the inspection hole in the upper right-hand side of the flywheel housing.

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Illustration 10	g03711132

Install the camshaft timing tool in the speed sensor hole.

If the camshaft timing tool does not fit over the gear tooth with the arrow, follow the instructions listed below:
1. Loosen bolts (2) .
1. Rotate the camshaft timing wheel in order to engage the timing tool with the gear tooth with the arrow.
1. Tighten bolts (2) to 23 ± 2 N·m (17± 1 lb ft).

Install the camshaft gear cover.

High-Pressure Fuel Pump Flange Adjust

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Table 4
Required Tooling
Qty	Part Number	Part Description
1	456-7989	Alignment Tool (High Pressure Pump)

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Illustration 12	g03836912
(1) Flange (2) Flywheel housing (3) Positioning tool (4) Fastening screws

Apply positioning tool (3) on flywheel housing (2) to check and adjust the center to center distance between the camshaft and fuel pump.

Install flange (1) on the positioning tool and install fastening screws (4) .

Torque the fastening screws to 23 ± 2 N·m (17 ± 1.5 lb ft). Remove the positioning tool from the flywheel housing.

Idler Gear Adjust

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Table 5
Required Tooling
Qty	Part Number	Part Description
1	456-7991	Positioning Gauge (Idler Gear)

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Illustration 13	g03836936
(1) 456-7991 Positioning Gauge (Idler Gear) (2) Connecting rod (3) Fastening screw

Install positioning gauge (1) . Check and adjust the position of the connecting rod (2) for the relay gear. Tighten the fastening screw (3) to 23 ± 2 N·m (17 ± 1.5 lb ft).