Technical data

Section 04 ENGINE

Sub-Section 04 (ROTARY VALVE)

04-04-6

8,9 Bearing

Inspect bearings. Check for scoring, pitting, chip-

ping or other evidence of wear. Make sure plastic

cage (on bigger bearing) is not melted. Rotate

them and make sure they turn smoothly.

10, Gear

Visually check gear wear pattern. It should be

even on tooth length all around. Otherwise it

could indicate a bent shaft, check deflection. Re-

place gear if damaged.

Check for presence of brass filings in gear hous-

ing.

Rotary Valve Shaft Deflection

Deflection is measured with a dial gauge. Install

rotary valve shaft in crankcase half, without its

gear.

NOTE : End bearing must be in crankcase

half.

Measure shaft deflection near gear mounting ar-

ea.

1. Rotary valve shaft

2. End bearing in place

Deflection must not exceed specified value. Re-

place shaft as necessary.

ASSEMBLY

Assembly is essentially the reverse of disassem-

bly procedures. However pay particular attention

to the following.

9, Bearing

To install end bearing in crankcase, use a pusher

(P / N 290 876 500).

1. Pusher

Position ball bearing shielded side towards rotary

valve.

1. Shield side (toward gear)

Push bearing until it stops on its seat.

1. Bearing

2. Pusher

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F01D2DA

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