New Holland 40 Series Repair Manual page 41

- - - - - - - - - - - - - - C H A P T E R 1 - - - - - - - - - - - - - -
Measure lengthwise:
A to B and C to D and compare dimensions,
variances between the readings will indicate
"taper".
Measure crosswise:
C to D and compare dimensions lengthwise.
A to B variances will indicate an out-of-round
condition.
Specifications:-
Taper of cylinder bore:
repair limit-0.001 in (0.025mm)
wear limit -0.005 in (0.127mm)
Cylinder bore out of round:
repair limit-0.0015 in (0.03mm)
wear limit-0.005 in (0.127mm)
Cylinder bore diameter:
4.4007-4.4032 in (111.778-111.841 mm).
2. Where only minor imperfections exist and
bores are to specification, hone the bores
prior to installing new piston rings, pro-
vided piston to bore clearance does not
exceed 0.0065 in (0.165mm).
3. If cylinder bores are outside the specifica-
tion they should be bored or honed, to fit
the next oversize piston. The finished
bore size can be determined by measur-
ing piston diameter at right angles to the
piston pin and adding the appropriate pis-
ton to bore clearance.
4. Oversize pistons available:
0.004 in (0.10mm)
0.020 in (0.51 mm)
0.040 in (1.0mm)
5. Bores to take 0.004 in (0.10mm) oversize
pistons need only be honed using a rigid
hone with a grit size of 150-220. Clean
thoroughly after boring and honing.
6. Sleeving of the cylinder bores becomes
expedient when:-
1, Oil consumption is high due to porosity.
2, Replacing sleeves, installed in service.
3, Cylinder bore is damaged beyond re-
boring limits.
NOTE: When reconditioning engines
equipped with sleeves, use only standard or
0.004 in (0.1016mm) oversize pistons
23
SLEEVING - BORING AND HONING
40
R1-37
Cylinder Block Sleeving
1. Measure the outside diameter (1) of the
sleeve in several places and average the
dimension. Counter bore the cylinder
block (see step 2) using the average di-
mension to obtain a press fit between
bore and sleeve. Interference of sleeve to
the cylinder bore to be 0.001-0.003 in
(0.025-0.076mm), Figure 40.
2. Counter bore to a depth of 8.26 in
(209mm) from the block face, surface fin-
ish of the bore is not to exceed (80 mi-
crons). Leave a step at the bottom of the
bore a minimum of 0.180-0.200 in
(4.572-5.080mm), allowing for run out of
chamfers.
3. Bore through diameter to the diameter of
4.454-4.456 in (114.3-116.0mm).
4. Clean the cylinder bores and thoroughly
dry.
5. Grease the sleeve with ESA-MIC75-B or
similar and press the sleeve home to the
lip in the bore. The top of the sleeve
should protrude through the top of the
block 0.005-0.040 in (0.127-1.0mm).
6. Bore the sleeve to:
4.3985-4.400 in (110.00-111. 76mm).
7. Skim the block face and top of sleeves to
achieve the specified flatness of
0.003 in (0.08mm) in any 6 in (152mm),
0.001 in (0.03mm) in any 1 in (25.4mm).
A chamfer in the internal diameter at the
top of the sleeve to 45°x0.020 in (0.5mm)
should be maintained to prevent piston
damage on re-assembly.
8. Break the sharp edge at the bottom of the
sleeve prior to honing.