Case 770 EX, Service Manual

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Engine - Engine and crankcase
Connecting rods
Small end bore diameter
41.846 – 41.884 mm ( 1.647 – 1.649 in )
Small end bushing outer diameter 41.979 – 42.017 mm ( 1.647 – 1.649 in )
Bushing interference fit in small end 0.095 – 0.171 mm ( 0.0037 – 0.0067 in )
Small end bushing fitted ID 38.004 – 38.014 mm ( 1.496 – 1.497 in )
Big end bore diameter 67.407 – 67.422 mm ( 2.654 – 2.654 in )
Maximum connecting rod axis misalignment at
125.000 mm ( 4.921 in )
± 0.07 mm ( 0.0028 in )
Maximum connecting rod weight difference over a
complete set from the same engine
25.00 g ( 0.88 oz )
Pistons
Piston diameter: Measured at 12.000 mm ( 0.472 in )
from base of skirt and right angles to pin
103.852 – 103.870 mm ( 4.089 – 4.089 in )
Piston clearance in liner 0.130 – 0.172 mm ( 0.005 – 0.007 in )
• Maximum wear clearance
0.300 mm ( 0.012 in )
Piston oversize range 0.600 mm ( 0.024 in )
Piston stand-out with respect to head at TDC 0.430 – 0.840 mm ( 0.017 – 0.033 in )
Piston pin diameter 37.983 – 37.990 mm ( 1.495 – 1.496 in )
Piston pin seat bore in piston 38.000 – 38.006 mm ( 1.496 – 1.496 in )
Piston pin clearance in piston 0.0100 – 0.0230 mm ( 0.0004 – 0.0009 in )
Piston pin clearance in small end bushing 0.0140 – 0.0310 mm ( 0.0006 – 0.0012 in )
• Maximum wear clearance
0.060 mm ( 0.002 in )
Maximum weight difference between pistons on same
engine
20.00 g ( 0.71 oz )
Piston ring clearance in groove:
• Top
0.0900 – 0.1220 mm ( 0.0035 – 0.0048 in )
• 2
nd
0.0600 – 0.0850 mm ( 0.0024 – 0.0033 in )
• 3
rd
0.0400 – 0.0750 mm ( 0.0016 – 0.0030 in )
Maximum wear clearance:
• Top
0.50 mm ( 0.02 in )
• 2
nd
and 3
rd
0.20 mm ( 0.01 in )
Piston ring gap:
• Top
0.25 – 0.40 mm ( 0.01 – 0.02 in )
• 2
nd
0.60 – 0.85 mm ( 0.02 – 0.03 in )
• 3
rd
0.30 – 0.55 mm ( 0.01 – 0.02 in )
Maximum wear gap 1.20 mm ( 0.05 in )
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