John Deere stx38 - Manual (Page 80)

3 - 48
4/23/97
REPAIR ENGINE
5. Measure inside diameter of crankshaft main
bearing bore (E) in crankcase.
6. Subtract journal OD. from bore ID. to determine if
clearance is within specifications. Replace parts if
not within specifications.
Crankshaft Sleeve Bearing Bore Specifications:
Oil Pan & Crankcase Main Bearing Bore ID
47.98—48.03 mm (1.889—1.891 in.)
Main Bearing Bore-to-Crankshaft Clearance. . . . . .
. . . . . . . . . . . . . . 0.03—0.09 mm (0.001—0.004 in.)
CRANKSHAFT ALIGNMENT
In alignment jig:
• Rotate crankshaft slowly. Dial indicators (A)
measure maximum Total Indicated Runout (TIR).
In engine:
• Rotate crankshaft slowly. Measure TIR at oil pan
end of crankshaft using dial indicator.
Replace crankshaft if not within specification.
Specifications:
Crankshaft Maximum TIR
In Alignment Jig . . . . . . . . . . . 0.10 mm (0.004 in.)
In Engine . . . . . . . . . . . . . . . . . 0.15 mm (0.006 in.)
REMOVE AND INSTALL OIL PAN
NOTE: Do not pry on gasket surface when removing
oil pan from crankcase.
1. Remove cap screws (A).
2. Pry oil pan from crankcase using flat blade
screwdriver on splitting tabs (B).
3. Clean mating surfaces of crankcase and oil pan.
4. Replace crankshaft seals, see Remove And Install
Oil Pan Seal and Remove And Install Crankcase
Seal.
IMPORTANT: DO NOT get sealant in oil passage
(C). Apply just enough to seal both sides of oil
passage when case halves are fastened
together.
5. Apply 1.6 mm (1/16 in.) bead of RTV silicone
sealant to oil pan flange. DO NOT block oil
passage (C).
6. Apply grease to inside lip of crankshaft main
bearing seal.
7. Install oil pan over crankshaft carefully to avoid
damaging main bearing seal.
IMPORTANT: Be sure to align flats of balancer
shaft and oil pump inner rotor when installing
oil pan.
Continued on next page
E
M52116
M80432
A A
A
B
M55945
C
M55901