Iseki SCM49, Руководство по обслуживанию

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CHAPTER 3. ENGINE
Fig. 3-37
(3) Inspection of the rocker arm shaft for wear
• Measure diameter at four points where the shaft
bears respective rocker arms.
• When wear is in excess of the usable limit, re-
place the shaft.
Standard value Usable limit
Diameter 16.00 mm 15.85 mm
Fig. 3-38
4) Inspection of the clearance between the rocker
arms and rocker arm shaft
• Measure the bore diameter of each rocker arm
and calculate the difference from the diameter
of the rocker arm shaft.
When the difference exceeds the usable limit,
replace the assembly of the rocker arm shaft and
rocker arms.
Fig. 3-35
Usable limit
Surface flatness (both for intake 0.2 mm
and exhaust manifolds)
When the deviation exceeds the usable limit,
replace the manifold.
4. DISASSEMBLY AND INSPECTION OF
THE ROCKER ARM SHAFT
(1) Disassembly of the rocker arm shaft assembly
• Put an identification mark on the front side top
of the rocker arm shaft for later reference.
• Remove snap rings C and remove arm brackets.
• Put away the brackets in order.
Fig. 3-36
(2) Inspection of the rocker arm shaft for bending
• Check for bending with a dial gauge.
Usable limit
Shaft bending 0.5 mm