John Deere stx38 - Manual (Page 79)

4/23/97
3 - 47
ENGINE REPAIR
INSTALL CONNECTING ROD
5. Fasten connecting rod (D) and cap (C) to
crankshaft.
6. Tighten cap screws (B) to specification.
7. Check connecting rod to crankshaft side clearance.
Replace if not within specification.
8. Install balance shaft, camshaft, oil pan, and cylinder
head. See appropriate procedures in this section.
Connecting Rod Specifications:
Cap Screw Torque
8 mm Straight Shank . . . . . . . . 22.6 N•m (200 lb-in.)
Step Down Shank. . . . . . . . . . . 14.6 N•m (130 lb-in.)
6 mm Straight Shank . . . . . . . . 11.3 N•m (100 lb-in.)
Side Clearance . . . 0.18—0.41 mm (0.007—0.016 in.)
CRANKSHAFT REMOVAL &
INSTALLATION
1. Remove camshaft and balancer assemblies.
2. Remove and inspect crankshaft (A).
3. Install new seals (B) in crankcase and oil pan.
4. Install crankshaft carefully, DO NOT damage seals.
CRANKSHAFT & MAIN BEARING
INSPECTION
1. Inspect for cracks or chipped teeth.
2. Check crankshaft alignment, see next heading.
3. Measure journals (A), (B), and (C).
Replace crankshaft if bent, damaged, or not within
specifications.
Crankshaft Bearing Journal Specifications:
Oil Pan End Main Journal OD:
New . . . . . . 41.915—41.935 mm (1.6502—1.6510 in.)
Wear Limit . . . . . . . . . . . . . . . 41.86 mm (1.648 in.)
Taper (maximum) . . . . . . . . 0.020 mm (0.0008 in.)
Out-of-Round (maximum) . 0.025 mm (0.0010 in.)
Flywheel End Main Journal OD:
New . . . . 41.913—41.935 mm (1.7682—1.7691 in.)
Wear Limit . . . . . . . . . . . . . . . 44.84 mm (1.765 in.)
Taper (maximum) . . . . . . . . 0.022 mm (0.0009 in.)
Out-of-Round (maximum) . 0.025 mm (0.0010 in.)
Connecting Rod Journal OD:
New . . . . . . 38.958—38.970 mm (1.5338—1.5343 in.)
Wear Limit . . . . . . . . . . . . . . 38.94 mm (1.5328 in.)
Taper (maximum) . . . . . . . . 0.012 mm (0.0005 in.)
Out-of-Round (maximum) . 0.025 mm (0.0010 in.)
4. Measure inside diameter of crankshaft main
bearing bore (D) in oil pan.
M55875
B
D
C
M58334
A
B
A
B
C
M52114
M52115
D