4807 Mercury SHAFT, THROTTLE

Do not operate or work on this engine unless you have read and understand the instructions and warnings in the Operation and Maintenance Manual. Failure to follow the instructions or heed the warnings could result in injury or death. Contact any Caterpillar dealer for replacement manuals. Proper care is your responsibility.
Accidental engine starting can cause injury or death to personnel working on the equipment.To avoid accidental engine starting, disconnect the battery cable from the negative (−) battery terminal. Completely tape all metal surfaces of the disconnected battery cable end in order to prevent contact with other metal surfaces which could activate the engine electrical system.Place a Do Not Operate tag at the Start/Stop switch location to inform personnel that the equipment is being worked on.
Table 1
Parameter Value
Face Runout (Axial Eccentricity) of the Flywheel 0.15 mm (0.006 inch)
Bore Runout (Radial Eccentricity) of the Flywheel 0.15 mm (0.006 inch)
Bore Runout (Radial Eccentricity) Flywheel clutch pilot bearing bore 0.13 mm (0.005 inch) Introduction
Use this procedure to check the axial and radial runout of the flywheel.Required Tools
Table 2
Required Tools
Item Qty Part Number Part Name
T1 1 8T-5096 Tool Gp
T1a 1 7H-1645 Holding Rod
T1b 1 7H-1940 Universal Attachment
T1c 1 7H-1942 Dial Indicator
T1d 1 7H-1945 Holding Rod
T1e 1 7H-1948 Swivel Clamp Face Runout (Axial Eccentricity) of the Flywheel - Check
Illustration 1 g06442773
Checking face runout of the flywheel
(T1a) 7H-1645 Holding Rod
(T1b) 7H-1940 Universal Attachment
(T1c) 7H-1942 Dial Indicator
(T1d) 7H-1945 Holding Rod
(T1e) 7H-1948 Swivel Clamp
Install Tooling (T1c) onto the flywheel housing with Tooling (T1a), (T1d), and (T1e). Always put a force on the crankshaft in the same direction before the dial indicator is read. This will remove any crankshaft end clearance.
Set the dial indicator to read 0.0 mm (0.00 inch).
Turn the flywheel at intervals of 90 degrees and read the dial indicator.
Take the measurements at all four points. Find the difference between the lower measurements and the higher measurements. This value is the runout. The maximum permissible face runout (axial eccentricity) of the flywheel must not exceed 0.15 mm (0.006 inch).Bore Runout (Radial Eccentricity) of the Flywheel - Check
Illustration 2 g06442491
Checking bore runout of the flywheel
(T1a) 7H-1645 Holding Rod
(T1b) 7H-1940 Universal Attachment
(T1c) 7H-1942 Dial Indicator
(T1d) 7H-1945 Holding Rod
(T1e) 7H-1948 Swivel Clamp
Install Tooling (T1c) onto the flywheel housing with Tooling (T1a), (T1d), and (T1e). Make an adjustment of Tooling (T1b) so that the dial indicator makes contact on the flywheel.
Set the dial indicator to read 0.0 mm (0.00 inch).
Turn the flywheel at intervals of 90 degrees and read the dial indicator.
Take the measurements at all four points. Find the difference between the lower measurements and the higher measurements. This value is the runout. The maximum permissible bore runout (radial eccentricity) of the flywheel must not exceed 0.15 mm (0.006 inch).Bore Runout (Radial Eccentricity) of the Flywheel Clutch Pilot Bearing Bore - Check
Illustration 3 g06442800
Flywheel clutch pilot bearing bore
(T1a) 7H-1645 Holding Rod
(T1b) 7H-1940 Universal Attachment
(T1c) 7H-1942 Dial Indicator
(T1d) 7H-1945 Holding Rod
(T1e) 7H-1948 Swivel Clamp
Install Tooling (T1c) onto the flywheel housing with Tooling (T1a), (T1d), and (T1e). Make an adjustment of Tooling (T1b) so that the dial indicator makes contact on the flywheel.
Set the dial indicator to read 0.0 mm (0.00 inch).
Turn the flywheel at intervals of 90 degrees and read the dial indicator.
Take the measurements at all four points. Find the difference between the lower measurements and the higher measurements. This value is the runout. The maximum permissible pilot bore runout of the flywheel must not exceed 0.13 mm (0.005 inch).