Section 02 717 ENGINE
Subsection 05 (ROTARY VALVE)
ROTARY VALVE TIMING
CAUTION:
Never use the ridge molded in crank
case as a timing mark.
The degree wheel (P/N 529 035 607) and the TDC
gauge (P/N 295 000 143) are required to measure
rotary valve opening and closing angles in relation
with MAG side piston.
360 350 340
330
320
310
30
0
29
0
28
0
27
0
26
0
25
0
240
230
220
210
200
190
180
170
160
15
0
14
0
13
0
12
0
11
0
10
0
90
80
70
60
50
40
30
20 10
10
20
30
40
50
60
70
80
90
10
0
11
0
12
0
13
0
140
150
160
170
180
19
0
200
210
22
0
23
0
24
0
25
0
26
0
27
0
28
0
29
0
30
0
31
0
32
0
330
340
350 360
F00B0DB
529 035 607
295 000 143
Rotary valve must be set so that timing occurs as
follows:
TIMING
ENGINE
OPENING
BTDC
CLOSING
ATDC
717
147° ± 5
65.5° ± 5
Timing Procedure
The following timing procedure example uses
these specifications:
OPENING: 147° BTDC
CLOSING: 65° ATDC
Proceed as follows:
– Turning crankshaft, bring MAG side piston to
Top Dead Center using the TDC gauge.
1
F01D2IA
1. Bring piston to TDC
– For opening mark, first align 360° line of degree
wheel with BOTTOM of MAG side inlet port.
Then, find 147° line on inner scale of degree
wheel and mark crankcase at this point.
F01D3DC
147°
2
1
OPENING MARK
Step 1:
Bottom of MAG inlet port. Align 360° line of degree wheel
Step 2:
Find 147° on inner scale of degree wheel and mark here
NOTE:
Do not rotate the crankshaft.
– For closing mark, first align 360° line of degree
wheel with TOP of MAG side inlet port. Then,
find 65° line on outer scale of degree wheel and
mark crankcase at this point.
smr2005-079
55
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