COMPRESSOR CRANKSHAFT BEARINGS

TM5-4110-234-14

TO 40R7-5-7-1

5-32.

COMPRESSOR CRANKSHAFT BEARINGS

Access. See paragraph 5-30 and remove the oil pump assembly.

Inspect/Replace.

(1) Inspect the crankshaft for wear or out-of-round journals. Inspect the journals and bearing surfaces for

scratches, scoring or other defects. Remove minor burrs with a fine mill file. Replace damaged bearings. Replace a

damaged or defective crankshaft.

NOTE

When crankshaft is replaced, there must be a minimum of 0.005 inch and a maximum of

0.11 inch end play on the shaft.

(2)

Inspect the oil filter for a loose or damaged oil tube. Replace a damaged or defective oil filter.

(3)

Inspect all hardware for worn or damaged threads. Replace damaged or defective hardware.

See paragraph 5-30 and install the oil pump assembly.

5-33.

COMPRESSOR PISTON AND ROD ASSEMBLY

a. Access. See paragraph 5-30 and remove oil pump assembly.

b. Inspect/Replace.

(1) Inspect the pistons and connecting rods for cracks, burrs and nicks. Remove small nicks and burrs from the

pistons and connecting rods. Replace damaged or defective parts.

(2) Check the piston pin bore in the bosses, using a new pin to determine the proper fit. Check the clearance

between the piston and cylinder wall. Recommended clearance is 0.0016/0.0025 inch (0.041/0.064 mm). Make sure the

clearance is checked both in line with the piston pin and at 90 from the axis of the pin.

(3) Piston rings should be installed by placing the open end of the ring on the piston first. Spread the rings gently

and only far enough to slip over the piston and into the proper grooves. Check the clearance between the ring and the

piston land. Recommended clearance is 0.0005/0.0015 (0.0127/0.0381 MM).

(4)

Inspect the piston pins for wear and score marks. Replace a worn or defective piston pin.

See paragraph 5-30 and install the oil pump assembly.

5-34.

ENGINE (F10000RG-2) |

a. General. See paragraph 4-59 for Removal/Installation instructions.

b. Disassembly/Reassembly. When engine disassembly is necessary, remove all of the complete assemblies

first, such as the manifold with the carburetor and air cleaner. An individual assembly such as the carburetor can always

be removed and served later.

(1) Keep all parts in their respective order, for example, valve assemblies and rod caps for their respective rod

and piston assemblies, etc.

(2)

Investigate reasons for parts failures.

(3)

Use new gaskets for assembly.

5-39