The permitted crankshaft-connecting rod balancing class combinations are listed in the following table:
CRANKSHAFT-CONNECTING ROD BALANCING CLASSES
Crankshaft balancing classes Balancing class combinations for
alternator side connecting rod pair
Balancing class combinations for
primary drive side connecting rod pair
AA BB+BB BB+BB
BB * BB+BB BB+BB
CC CC+CC / **BB+DD** CC+CC / **BB+DD**
DD DD+DD DD+DD
EE * EE+EE EE+EE
FF EE+EE EE+EE
* if necessary replace a crankshaft of a class not available as spare part by keeping the connecting
rods in the engine:
- for CRANKSHAFT BB - order CRANKSHAFT AA
- for CRANKSHAFT EE - order CRANKSHAFT FF
CAUTION
THERE ARE TWO TYPES OF CONNECTING RODS THAT
CAN BE DISTINGUISHED FOR A DIFFERENT MACHINING
IN THE SEATING OF THE BUSHING AND FOR THE TYPE
OF BUSHING (THE LENGTH VARIES). THE TWO TYPES OF
CONNECTING RODS ARE NOT INTERCHANGEABLE. THE
MOTORS MUST BE FITTED WITH FOUR CONNECTING
RODS OF THE SAME TYPE.
THE WEIGHT CATEGORIES OF THE CONNECTING RODS
AND THEREFORE THE COUPLINGS WITH THE CRANK-
SHAFTS REMAIN IDENTICAL FOR THE TWO DIFFERENT
TYPES OF CONNECTING ROD.
CAUTION
WHEN REPLACING A CRANKSHAFT WITH NO IDENTIFIABLE BALANCING CLASS (ON EN-
GINES PRIOR TO THE INTRODUCTION OF THE MODIFICATION), A CLASS "CC" CRANKSHAFT
MAY BE USED.
CAUTION
WHEN REPLACING CONNECTING RODS ON CRANKSHAFTS WITH NO IDENTIFIABLE BAL-
ANCING CLASS (ON ENGINES PRIOR TO THE INTRODUCTION OF THE MODIFICATION), A
CLASS "DD" CONNECTING RODS MAY BE USED.
TUONO V4 R a-PRC ABS Engine
ENG - 353
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