Yamaha WR250FM service manual Assembly and Installation Crankcase bearing

CRANKCASE AND CRANKSHAFT

ENG

ÈÉ

EC4N5000

ASSEMBLY AND INSTALLATION Crankcase bearing

1.Install:

•Bearing New

•Bearing stopper

•Bolt (bearing stopper)

T.R. 10 Nm (1.0 m · kg, 7.2 ft · lb)

•Screw (bearing stopper)

T.R. 10 Nm (1.0 m · kg, 7.2 ft · lb)

•Screw [bearing stopper (crankshaft)] 1

T.R. 10 Nm (1.0 m · kg, 7.2 ft · lb)

To left and right crankcase.

NOTE:

•Install the bearing by pressing its outer race parallel.

•To prevent the screw [bearing stopper (crankshaft)] from becoming loose, crush the screw head periphery a into the concave b using a punch etc. In so doing, take care not to damage the screwdriver receiving hole in the screw head.

Crankshaft

1.Install:

•Crankshaft 1

Use the crankshaft installing tool 2, 3, 4 and 5.

Crankshaft installing pot 2:

YU-90050/90890-01274

Crankshaft installing bolt 3:

YU-90050/90890-01275

Adapter (M12) 4:

YU-90063/90890-01278

Spacer (crankshaft installer) 5:

YM-91044/90890-04081

ÈFor USA and CDN

ÉExcept for USA and CDN

NOTE:

•Hold the connecting rod at top dead center with one hand while turning the nut of the installing tool with the other. Operate the installing tool until the crankshaft bottoms against the bearing.

•Before installing the crankshaft, clean the contacting surface of crankcase.

CAUTION:

Do not use a hammer to drive in the crank- shaft.

4 - 98