G3304 and G3306 Engines Caterpillar

Installation Procedure

Cleanliness is an important factor. Before assembly, all parts should be thoroughly cleaned in cleaning fluid. Allow the parts to air dry. Wiping cloths or rags should not be used to dry parts. Lint may be deposited on the parts which may cause later trouble. Inspect all parts. If any parts are worn or damaged, use new parts for replacement.

1. Install the upper halves of the main bearings in the engine block.

2. Apply clean engine oil to the bearings.
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   Illustration 1	g01004073

3. Use a hoist and suitable lifting chains to install the crankshaft in the engine block. Ensure that all the timing marks are in alignment.

4. Clean the main bearing caps. Install the lower halves of the main bearings in the caps.
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   Illustration 2	g01004074

5. Check the main bearing clearance with Tooling (A). Install the caps in the correct locations. Ensure that the number on the cap is toward the number on the pan surface on the left side of the block.
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   Illustration 3	g01004076

6. Apply clean engine oil on the threads of the bolts and on the faces of the washers that hold the main bearing caps. Install the bolts and washers. Tighten both bolts to 40 ± 4 N·m (30 ± 3 lb ft). Place a mark on the bolt heads and bearing caps. Tighten the bolts 90° from the mark, as shown in Illustration 3. Remove the bearing caps and measure the thickness of Tooling (A). Main bearing clearance must be 0.121 ± 0.045 mm (0.0048 ± 0.0018 inch). Maximum permissible clearance is 0.25 mm (0.010 inch).

7. Apply clean engine oil in the lower halves of main bearings. Install the caps in the correct locations. Install the bolts and washers. Tighten to 40 ± 4 N·m (30 ± 3 lb ft). Place marks on bolt heads and caps. Tighten each bolt 90° from the mark, as shown in Illustration 3.
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   Illustration 4	g01004077

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   Illustration 5	g01004079

8. Check the crankshaft end clearance with Tooling (B). The end clearance is controlled by thrust bearing (1) on the rear main. End clearance must be 0.122 to 0.579 mm (0.005 to 0.023 inch).

   Note: If the accessory drive gear, the idler gear, the camshaft gear, or the crankshaft gear have been removed or replaced, it is necessary to put the accessory drive shaft into correct timing after the engine is assembled.

End By:

1. Install the pistons and connecting rods. Refer to Disassembly and Assembly, "Piston and Connecting Rods - Install" for the engine that is being serviced.

2. Install the timing gear cover. Refer to Disassembly and Assembly, "Timing Gear Cover - Remove and Install" for the engine that is being serviced.

3. Install the flywheel housing. Refer to Disassembly and Assembly, "Flywheel Housing - Install" for the engine that is being serviced.

4. Install the engine.