Rotax B gear box, Rotax B reduction drive, Rotax B style gear box for provision 8 engines.

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Rotax B reduction drive provision 8 gear box.
The Rotax B drive was is on the Rotax 447, 503, and 582 engines.

The drive bolts directly to the engine using 8 bolts. Two are found inside the front case the other 6 are found on the outside of the rear case.

Because it is bolted to the engine using 8 bolts it is called a provision 8 gear box.
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# Part # Description Qty Req.

 


 
Rotax B gear box

1150.00
             
1 810 107 Gear housing 1  

367.00

  
2 932 091 Ball bearing 1  

26.80

  
3 850 430 O-ring  1  

15.75

  
4 841 306 Collar hex screw M8x65 24NM 2   5.10  
5 929 670 Dowel 10x13  2  

7.05

  
6 930 536 Gasket  1  

10.75

  
7 886 200 Gear set, 2.58:1  1  

307.00

  
  886 202 Gear set, 2.24:1  1  

345.00

  
  886 204 Gear set, 2.00:1 1  

370.00

  
8 827 785 Washer 1  

21.80

  
9 945 766 Lock washer VHV 13  1  

.95

  
10 941 656 Hex screw (60NM) 1  

9.60

  
11 910 372 Gear cover 1  

361.00

  
12 850 055 Oil seal 1  

31.75

  
13 827 850 Distance ring 1  

19.25

  
14 932 820 Ball bearing  1  

61.00

  
15 445 070 Snap ring 62x2  1  

4.80

  
16 837 029 Prop shaft 1  

341.00

  
17 944 470 Shim 25.5/34/.2 As Req.  

2.30

  
17 944 471 Shim 25.5/34/.3 As Req.  

2.00

  
17 944 472 Shim 25.5/34/.5 As Req.  

2.00

  
17 944 473 Shim 25.5/34/1 As Req.  

2.00

  
17 944 474 Shim 25.5/34/.1 As Req.  

2.00

  
18 847 620 Distance 3 ring  1  

21.75

  
19 939 020 Disk spring 850  12  

5.75

  
20 958 770 Dog hub  1  

87.50

  
21 944 469 Thrust washer  2  

2.30

  
22 827 840 Angular ring 1  

19.00

  
23 827 860 Ring half  2  

24.25

  
24 945 752 Lock washer 6  

.50

  
25 941 350 Hex screw (24NM)  2  

6.40

  
26 941 171 Hex screw M8x1 0 (24NM) 2  

3.45

  
27 841 301 Hex screw M8x65 (24NM) 2  

2.00

  
28 552 280 Gasket ring 1  

2.75

  
29 840 270 Magnetic plug 1  

17.50

  
30 830 890 Gasket ring 2  

1.30

  
31 841 781 Capstan screw M6x10  2  

5.70

  
32 941 115 Air vent screw 1  

18.25

  
32 SW032 Safety wire  As Req.

33 931 300 Gasket Ring 1  

3.15

  
34 LT222 Loctite 222, violet As Req.

35 LT680 Loctite 680, green As Req.

36 PSAS Anti-seize  As Req.

37- 8P Energrease As Req.

Rotax B box, Rotax B reduction drive for use with Rotax provision 8 crankcase.

Rotax B box, Rotax B reduction drive for use
with Rotax provision 8 crankcase.

Installing the Rotax "B" Gear Box Prov 8

1. Clean and degrease the crankshaft end and mounting holes on the crankcase before starting.

2. Using the Rotax fixation tool supplied in the Rotax tool kit lock the engine up by installing the pin into the impulse hole, used to run the fuel pump. With the pin in place rotate the engine, until it locks.

3. Install drive gear onto crankshaft end, with the lockwasher under the head of the bolt, and the flat washer under the lockwasher. Torque to 45 FOOT lbs.

4. Install the rubber O ring (#3) into the back half of the gearbox, if necessary use dielectric grease to hold ring in place.

5. Position back half of gearbox (#1) onto crankcase. Apply loctite #242 to threads of bolts (#4) install two bolts and torque 195 INCH lbs.

6.Install gasket - make sure gasket is not damaged.

7. Install front half of gear box housing and secure with bolts and lockwashers. Use loctite 242 on threads and torque to 195 INCH lbs.

8. Fill gear box with 90 weight oil until oil runs out the lower of the two side plugs.

9. Tighten then safety wire top and bottom plugs.

10. Tighten then safety wire vent cap and drain plug.

Click here for proper B box preload advisory
Click here for gear box installation in pdf format
Rotax gear box updates - click here for more information

Rotax manuals in pdf format
 Rotax 2 stroke installation manual
Rotax 2 stroke maintenance manual
 Rotax 2 stroke operators manual

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