ENGINE REPAIR 6A-93
• Measurements to carry out the mechanical rectiffying
are obtained from the four Ø of set of four new spare
pistons oversized in 0.4 mm plus the nominal play
between piston and cylinder.
• If the measurements obtained concerning amount of
wear, oval and conical shaping of cylinders are more
than 0.4 mm when comparing against the nominal Ø
of cylinders the block of cylinders should be
recuperated with a lining up operation.
• Nominal Ø of cylinders oversized by 0.4 mm:
94,802 ÷ 94,832 mm
• Standard cylinders Ø nominal diameter :
94,402 ÷ 94,432 mm
• Nominal Ø of pistons oversized by 0.4 mm:
94,706 ÷ 94,720 mm
• Nominal play between piston and cylinder:
0,082 ÷ 0,126 mm
CAUTION:
After doing an oversizing mechanical rectifying of
cylinders or cylinders lined up, remove
mechanization caps and clean thoroughly the block
with cleaning fluid, compressed air and cylindical
sweeping brushes.
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Surface coupling measurement with cylinder head
3) Dismantle the fixtures (4). Check flatness of upper face of the
block using a metallic ruler (5) and a thickness calliper (6).
NOTE:
If lack of flatness is appreciated do a milling operation
to achieve flatness ensuring that the ovehanging of
the pistons is within the specified range after milling.
Overhanging minimum and maximum of pistons in
upper face of block:
0,40 ÷ 0,80 mm
4
5
6
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