FAN GP-CIRCULATING 4V9290 - Caterpillar

Illustration 10 g00812380
Position of the magneto drive
(1) Timing bolt
(2) Drive coupling and drive slot
Remove timing bolt (1). Turn the magneto drive in order to position the yellow mark that is on the distributor disc in the center of the hole. Install the timing bolt.
Place drive coupling (2) in the vertical position. To rotate the drive coupling, pull out the coupling and rotate the coupling. When the coupling is in the correct position, push in the coupling in order to engage the gear teeth.
Install the magneto in order to engage the drive tang and the drive slot.
Start the engine. Operate the engine at high idle speed. Note: Do not adjust the timing at low idle because of the timing advance in the magneto.
Attach a timing light to the secondary lead for the spark plug of the number 1 cylinder. Use the timing light to observe the timing marks on the flywheel. If necessary, loosen the bolts for the magneto and rotate the magneto in order to gain the desired timing. When the timing is correct, tighten the bolts for the magneto.
Install the covers for the flywheel housing. Adjustment of the Brush Spring
Illustration 11 g00812377
(1) End cap assembly
(2) Gasket for end cap assembly
(3) Distributor block
(4) Dowel rod
(5) Distributor disc
(6) Brush and spring assembly Measure the distance between distributor block (3) and the face of the distributor disc (5). The correct clearance indicates the correct pressure on the brush and spring assembly (6).
Remove the timing bolt and install dowel rod (4) between distributor block (3) and distributor disc (5). The correct clearance is 3.96 to 5.56 mm (0.156 to 0.219 inch).
To increase the clearance, add additional gaskets (2) for the end cap assembly. To reduce the clearance, add number 10 washers between distributor block (3) and end cap assembly (1). Ignition Transformers
Check the transformer resistance. Refer to Specifications, "Transformer".Spark Plugs and Adapters
Table 6
Tools Needed Quantity
1F-0479 Wrench 1
9U-6695 Spark Plug Firing Indicator Gp 1
2P-5481 Deep Well Socket 1
154-9521 Spark Plug Seat Cleaner 1
Illustration 12 g00803420
(1) Gasket
(2) O-ring seal
(3) Adapter Use the 1F-0479 Wrench for removal and installation of the spark plug adapter. When you install the adapter, make sure that gasket (1) is in place. Apply liquid soap to O-ring seal (2) and the bore for the seal in the cylinder head. Apply 5P-3931 Anti-Seize Compound on the threads of the adapter and on the threads in the cylinder head. Tighten the adapter to a torque of 95 8 N m (70 6 lb ft).The 9U-6695 Spark Plug Firing Indicator Gp is an aid for determining ignition problems. Refer to the instructions that are included with the tool.The condition of the spark plug and the changes in engine load will vary the voltage that is needed to create a spark. A new spark plug in an engine at low idle requires approximately 3,000 to 6,000 V. At full load, 8,000 to 10,000 V