John Deere stx38 - Manual (Page 64)

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4/23/97
REPAIR ENGINE
REMOVE AND INSTALL ROCKER
ARMS
1. Remove valve cover.
IMPORTANT: Mark push rods for assembly in
original locations.
2. Remove cap screws (C) and pivot ball spacers (B).
3. Remove rocker arms (D).
4. Remove push rods (E).
5. Remove splash plate (A).
6. Inspect and replace components as necessary.
7. Install components in reverse order of removal.
Specification:
Rocker Pivot Bolts . . . . . . . . . . . . 14 N•m (124 lb-in.)
INSPECT PUSH ROD
Specification:
Push Rod Bend (maximum) . . . 0.76 mm (0.030 in.)
REMOVE AND INSTALL CYLINDER
HEAD
IMPORTANT: Engine must be cold before
removing cap screws to avoid warping
aluminum cylinder head.
NOTE: Cylinder head can be serviced without
removing engine from tractor.
1. Remove cap screws (A), spacer (B) and cylinder
head. Discard gasket and clean head and block.
2. Install new gasket with cylinder head, cap screws
and spacer.
3. Torque cylinder head cap screws in 7 N•m (62 lb-
in.) increments in sequence illustrated.
Specification:
Cylinder Head Cap Screws . . . . . . . 41 N•m (30 lb-ft)
4. Install push rods and rocker arms.
5. Clean valve cover and install using RTV silicone
sealant between mating surfaces. Tighten valve
cover cap screws, in sequence illustrated.
Specification:
Valve Cover Cap Screws . . . . . . . 7.4 N•m (65 lb-in.)
M55859
C
D E
A
B
B
Late model shown
Early model differs slightly
M55861
B A
M52074
2 4
1
3
5
M52075
2
4
1
5
3