Checks, Measurements And Repairs - Farmall 90 Manual

114
CYLINDER BLOCK, LINERS
WARNING
Handle all parts carefully.
Do not put your hands or fingers between parts.
Wear the prescribed safety clothing, including
goggles, gloves and safety footwear.
Checks and Measurements
After disassembling the engine, thoroughly clean the
crankcase assembly.
Use the specific lifting rings for transporting the as-
sembly.
Carefully check the crankcase is not cracked.
Check the condition of the plugs (3, fig. 250) on the
crankcase. If they are rusty or if there is the slightest
doubt about their seal, change them.
Examine the surfaces of the cylinder liners; they
should show no scoring, ovality, taper or excessive
wear.
To check the internal diameter of the cylinder liners
for ovality, taper and wear, use the bore gauge (1),
fitted with a dial gauge zero--set on the ring gauge (2)
of the diameter of the cylinder liner.
NOTE: If the ring gauge is not available, use a mi-
crometer.
Measurements must be taken for each single liner, at
three different heights on the liner and on two ortho-
gonal faces: one parallel to the longitudinal axis of the
engine (A) and the other perpendicular (B); maxi-
mum wear is generally found on this face in corre-
spondence with the first measurement.
If you find any ovality, taper or general wear outside
the tolerance given on page 8, bore and recondition
the cylinder liners. The cylinder liners must be re-
ground in relation to the diameter of the pistons sup-
plied as spare parts (oversized by 0.0196 in (0.5 mm)
over the nominal value) and to the assembly clear-
ance prescribed on page 8.
SECTION 10 - - ENGINE - - CHAPTER 1

CHECKS, MEASUREMENTS AND REPAIRS

MIF1030A
MIF1031A
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248