Honda CBR650 - Service manual > Main journal bearing

NOTICE

Do not interchange the bearing inserts. They must be installed in their original locations or the correct bearing oil clearance may not be obtained, resulting in engine damage.

BEARING INSPECTION

Remove the crankshaft.

Check the main journal bearing inserts [1] for unusual wear or peeling.

Check the bearing tabs [2] for damage.

If the main journal bearing is damaged, select a replacement bearing.

OIL CLEARANCE INSPECTION

Remove the crankshaft.

Clean off any oil from the bearing inserts and main journals.

Install the crankshaft onto the upper crankcase.

Do not rotate the crankshaft during inspection.

Put a strip of plastigauge [1] lengthwise on each main journal avoiding the oil hole.

Install the dowel pins [1] onto the upper crankcase [2].

Install the lower crankcase onto the upper crankcase.

Clean the crankcase main journal bolts (reuse) in solvent, and dry them thoroughly.

Apply engine oil to the crankcase main journal bolt threads and seating surfaces.

Install the crankcase main journal bolts [1].

Make sure the upper and lower crankcase are seated securely.

Tighten the crankcase main journal bolts in numerical order as shown in a crisscross pattern in 2 or 3 steps to the specified torque.

Further tighten the crankcase main journal bolts 120º.

TORQUE:15 N*m (1.5 kgf*m, 11 lbf*ft) + 120º

Remove the crankcase main journal bolt and lower crankcase.

Measure the compressed plastigauge at its widest point on each main journal to determine the oil clearance.

SERVICE LIMIT: 0.05 mm (0.002 in)

If the oil clearance exceeds the service limit, select a replacement bearing.

BEARING SELECTION

Letters (A, B or C) on the left side of upper crankcase are bearing support I.D. codes from left to right.

Record the crankcase bearing support I.D. code letters [1] from left side of the upper crankcase as shown.

Numbers (1, 2 or 3) on the crank weight are main journal O.D. codes from left to right.

If you are replacing the crankshaft, record the corresponding main journal O.D. code numbers [1] from the crank weight.

If you are reusing the crankshaft, measure the crankpin O.D. with a micrometer.

Cross-reference the main journal and bearing support codes to determine the replacement bearing color code [1].

MAIN JOURNAL BEARING THICKNESS:

1. Black
2. Brown
3. Green
4. Yellow
5. Pink

MAIN JOURNAL BEARING SELECTION TABLE:

NOTICE

After selecting new bearings, recheck the clearance with a plastigauge. Incorrect clearance can cause severe engine damage.

BEARING INSTALLATION

Clean the bearing outer surfaces and crankcase bearing supports.

Install the main journal bearing inserts [1] onto the crankcase bearing supports, aligning each tab with each groove.

Crankpin bearing

NOTICE

Do not interchange the bearing inserts. They must be installed in their original locations or the correct bearing oil clearance may not be obtained, resulting in engine damage.

BEARING INSPECTION

Remove the crankshaft.

Check the crankpin bearing inserts [1] for unusual wear or peeling.

Check the bearing tabs [2] for damage.

If the crankpin bearing is damaged, select a replacement bearing.

OIL CLEARANCE INSPECTION

Remove the crankshaft.

Clean the mating surface of the connecting rod and crankpin bearing cap with solvent and blow them with compressed air.

Clean off any oil from the bearing inserts and crankpins.

Install the crankshaft onto the upper crankcase.

Set the connecting rods onto the crankpins.

Do not rotate the crankshaft during inspection.

Put a strip of plastigauge [1] lengthwise on each crankpin avoiding the oil hole.

Install the crankpin bearing caps [1] by aligning the I.D.

code number on the connecting rod and bearing cap.

NOTICE

Be sure to install each part in its original position, as noted during removal.

Apply engine oil to the crankpin bearing cap nut [1] threads and seating surfaces.

Install and tighten the crankpin bearing cap nuts in 2 or 3 steps alternately to the specified torque.

TORQUE:35.2 N*m (3.6 kgf*m, 26 lbf*ft)

Remove the bearing caps.

Measure the compressed plastigauge at its widest point on the crankpin to determine the oil clearance.

SERVICE LIMIT: 0.06 mm (0.002 in)

If the oil clearance exceeds the service limit, select the correct replacement bearings.

BEARING SELECTION

Numbers on the connecting rods are the codes for the connecting rod I.D.

Record the connecting rod I.D. code number [1] or measure the I.D. with the connecting rod bearing cap installed without bearing inserts.

Letters (A, B or C) on the crank weight are the crankpin O.D. codes from left to right.

If you are replacing the crankshaft, record the corresponding crankpin O.D. code letter [1].

If you are reusing the crankshaft, measure the crankpin O.D. with a micrometer.

Cross-reference the connecting rod and crankpin codes to determine the replacement bearing color code [1].

CRANKPIN BEARING THICKNESS:

1. Blue
2. Black
3. Brown
4. Green
5. Yellow

CRANKPIN BEARING SELECTION TABLE:

NOTICE

After selecting new bearings, recheck the clearance with a plastigauge. Incorrect clearance can cause severe engine damage.

BEARING INSTALLATION

Clean the bearing outer surfaces, crankpin bearing cap and connecting rod.

Install the crankpin bearing inserts [1] onto the bearing cap and connecting rod, aligning each tab with each groove.

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