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5-6

Repair manual KTM 250 -F Art.-No. 3.206.052-E

Measuring the outside dimension of the crankshaft webs

– Measure the outside dimension of the crankshaft webs using a

sliding gauge, as illustrated.

Outside dimension of the crankshaft webs = 54 mm ± 0.05 mm

Crankshaft bearings

– Fix the crankshaft in the vise with protective jaws.

– Heat the special tool 584.29.037.037 on a hotplate to approx.

150° C and immediately slip onto the inner ring. Firmly press the

special tool together to obtain a good heat transfer and pull the

inner ring off the crankshaft.

– To mount the new inner ring, heat the special tool to approx. 150° C

again, clamp around a new inner ring and immediately slip onto the

crankshaft journal.

– Make sure the new inner ring fits flush.

– After replacing the inner ring, measure the axial clearance of the

crankshaft.

CAUTION

EVER CLAMP THE CRANKSHAFT INTO A VISE WITH THE CRANKSHAFT JOURNAL AND

TRY TO STRIKE THE INNER BEARING RING

. THE CRANKSHAFT WEB WILL BE

PRESSED TOGETHER AND RENDER THE CRANKSHAFT USELESS

Axial clearance of the crankshaft

– Insert the crankshaft in the right casing half and mount the left

casing half.

– Mount the casing screws around the crankcase and tighten.

– Mount the dial gauge support on the engine case and measure the

axial clearance of the crankshaft.

Axial clearance: 0.25 - 0.35 mm

– Correct the axial clearance if the measured value does not

correspond to the setpoint value.

– To correct, remove the crankshaft and pull the inner ring off the

crankshaft on the ignition side using the special tool. Add or remove

compensating disks.

NOTE: Add compensating disks if the axial clearance is too large.

Remove compensating disks if the axial clearance is too small. Only

add compensating disks on the ignition side.

KTM 250 SX-F 2006 Repair Manual

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