Selecting The Connecting Rod-Crankpin Bearings - Cagiva Navigator Workshop Manual

SELECTING THE CONNECTING ROD-CRANKPIN BEARINGS

• Position some plastigauge axially on the crankpin, avoiding the oil
hole, in the top dead centre or low dead centre position as shown
in the figure.
• Tighten the bearing cap bolts in two steps to the prescribed torque.
When fitting the bearing cap to the crankpin, be sure to distinguish
the side with inside diameter code B from the other side.
The inside diameter codes must always face the cylinder intake
valves, and oil holes A must face inwards.
Tightening torques:
Connecting rod bearing cap bolt
Specific tool: 800096651 - Thickness gauge
Specific tool: 800096872 - Thickness gauge
Never turn the crankshaft or the connecting rod after inserting a
piece of plastigauge.
• Remove the bearing cap and measure the length of the compressed
plastigauge with the scale. Take the measurement at the widest
portion.
Service limit
Connecting rod big end oil clearance: 0,080 mm (0.00315 in)
• If the oil clearance exceeds the specified limit, select the neces-
sary bearings from the bearing selection table.
• Check the corresponding connecting rod inside diameter code B,
"1" or "2".
• Check the corresponding crankpin outside diameter code C, "1",
"2" or "3".
• Crankpin outside diameter code C, "1", "2" or "3", is stamped on
the left crank.
Bearing selection table
Code
Conn. Rod 1
I.D. coded 2
Standard
Connecting rod big end oil clearance: 0,032-0,056 mm
ENGINE
(initial) 40 N·m (0,4 kg-m)
(29.2 lb·ft)
(final) 80 N·m (0,8 kg-m)
(58.4 lb·ft)
Crankpin O.D. C
1 2
Green Black
Black Brown
(0.00125-0.00224 in)
3
Brown
Yellow Left
B
B
↑
Front
Right
C
D.161