New Holland CX720 Repair Manual page 1782

Cylinder block - Rebore (B.10.A.70 - F.75.C.30)
CX720, CX740, CX760, CX780, CX820, CX840
1. Measure the outside diameter (1) of the sleeve in
several places, and average the dimension. Counter
bore the cylinder block (see TRAVELLING - Storing
(F.10.A.40 - B.10.A.70)) using the average dimen-
sion to obtain a press fit, between bore and sleeve.
Interference of sleeve to the cylinder bore to be
0.025-0.076 mm (0.001-0.003 in).
Counter bore to a depth of 204.7 mm (8.06 in), from
the block face, surface finish of the bore is not to
exceed (80 microns). Leave a step at the bottom of
the bore a minimum of 9.60-10.16 mm (0.38-0.400
in), allowing for run out of chamfers.
Bore through diameter, to the diameter of, 114.3-
116.0 mm (4.454-4.456 in).
Clean the cylinder bores and thoroughly dry.
Grease the sleeve with a general purpose grease
and press the sleeve home to the lip in the bore. The
top of the sleeve should protrude through the top of
the block, 0.127-1.0 mm (0.005-0.040 in).
Bore the sleeve to, 110.00-111.76 mm (4.3985-4.400
in).
Skim the block face, and top of sleeves, to achieve
the specified flatness of 0.08 mm (0.003 in) in any
152 mm (6 in) 0.03 mm (0.001 in) in any 25.4 mm
(1 in). A chamfer in the internal diameter at the top
of the sleeve to 45 ° x 0.5 mm (0.020 in) should be
maintained, to prevent piston damage on re-assem-
bly.
Break the sharp edge at the bottom of the sleeve
prior to honing.
Hone the cylinder bore to, Grade B, 111.790-111.803
mm (4.4012-4.4017 in.)
Maximum Taper, 0.025 mm (0.001 in) through to bot-
tom of the bore.
Maximum Ovality, 0.038 mm (0.0015 in)
NOTE: Surface finish to be an average of 20 to 30 Microns,
cross hatched at 35 °-55 °.
POWER PRODUCTION - ENGINE
2 4/7/2006
B.10.A / 236
1
TA6010042