6A–48 ENGINE MECHANICAL
15.Remove the injection pipe oil seal.
Inspection and Repair
Make the necessary adjustments, repairs, and part
replacements if excessive wear or damage is
discovered during inspection.
Cylinder Head
Cylinder Head Lower Face Warpage
Use a straight edge and a feeler gauge to measure the
four sides and the two diagonals of the cylinder head
lower face.
If the measured values exceed the specified limit, the
cylinder head must be replaced.
Cylinder Head Lower Face Warpage
Standard: 0.05 mm (0.002 in) or less
Limit: 0.20 mm (0.008 in)
NOTE: Do not attempt to regrind the cylinder head lower
face.
Check the cylinder head lower face for cracking and
other damage.
Valve Guide
Valve Stem and Valve Guide Clearance
Measuring method-I
1. Insert the valve to the cylinder head.
2. Set the dial indicator to the valve stem at measuring
point as shown in the illustration.
Measuring Point: 10 mm (0.4 in)
3. Set the dial indicator needle to “0”.
4. Move the valve head from side to side.
Read the dial indicator.
Note the highest dial indication.
If the measured values exceed the specified limit, the
valve and the valve guide must be replaced as a set.
Valve Stem Clearance
Intake Valve
Standard: 0.04 – 0.06 mm (0.0016 – 0.0024 in)
Limit: 0.20 (0.008 in)
011MX026
011EY00066
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