Con Rod Clearance Check - MOTO GUZZI V750 IE Workshop Manual

V750 IE
4.11.2.

CON ROD CLEARANCE CHECK

•
With a micrometer check con rod pin diameter measurement on the orthogonal axes and in the working area of the
halfbearings. Check bearing housing measurement on both timing and flywheel sides.
•
After replacing screws to prescribed torque in the con rod without halfbearings, use centesimal comparator to
measure the external diameter of halfbearing housing. Use round-tipped micrometer to measure thickness of the
two halfbearings.
•
Check that bushings in con rod eye do not show signs of seizing pits or deep scratching. If so, they must be
replaced.
Big end diameter 43.657÷43.670 mm (in 1.7188 ÷ 1.7193).
Crank pin diameter 39.995÷40.001 mm (in 1.5746 ÷ 1.5748).
Clearance between crank pin and connecting rod big end bearing at 90° from the mating faces: min. 0.020 (in 0.0008),
max. 0.061 (in 0.0024).
Connecting rod bearing thicknesses
NORMAL (production)
A
mm (in)
1.537÷1.543
(0.0605 ÷ 0.0607) (0.0601 ÷ 0.0603)
Diameter of bush driven into connecting rod small end and gudgeon pin
INSIDE DIAMETER FOR BUSHING
DRIVEN INTO CONNECTING ROD
SMALL END
mm (in)
18,010÷18,020
(0.7090 ÷ 0.7094)
B
mm (in)
1.527÷1.533
DIAMETER OF GUDGEON PIN
17,996÷18,000
(0.7085 ÷ 0.7087)
mm (in)
ENGINE
SMALL END BUSHING
TO GUDGEON PIN ASSEMBLY
CLEARANCE
mm (in)
0,010÷0,024
(0.0004 ÷ 0.0009)
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