Primary chaincase & screws

For gaskets and fibre washers click here; for wheel adjusters click here, oil click here. See notes under gearbox section (click here) regarding the change to 1956 swinging arm machines if problems are experienced with primary chain alignment. There is not, and never was a gasket under the clutch dome, except for the late W/NG models with the steel primary cases. Nor was there ever any kind of seal behind the clutch; oil is prevented from leaving by a lip around the hole and by the fact that the clutch runs very close to this lip. The competition models did have 2 large felt washers fitted between the inner primary case and the gearbox sprocket to prevent the ingress of mud and water into the chaincase.

Ariel did not specify which case screws went where, so there is an element of trial and error! If you are looking for clutch dome screws only, we have determined they are these – For Singles and twins 3 of 041 and 1 of 017 (from 1936 onwards). For Square Fours 4 of 041 1937-58

Case Screws
We sell case screws in sets or individually, both are listed below and most are available in stainless as well

Singles

Zinc plated Set No.

Stainless Set No.

Case Screws

03

011

014

015

017

041

043

1-4606

097

Length  CS00

11/16

1 3/16

2″

1″

1 3/4

3/8

13/16

1933-34 Singles

11

1

1935 Singles

1

8

3

1

1936-38 Singles

1

1

3

6

1

3

1

1939 OH/OG

10

1

1

W/NG Steel

28

2
1939-49 Singles CS11 CS11Q

1

3

6

2

3

1

1950-53 Singles CS12 CS12Q

1

5

7

2

3

1954 VB

1

5

7

2

3

1954-55 Singles CS13 CS13Q

1

3

9

1

3

1956-58 Singles CS14 CS14Q

3

9

1

3

1

Twins

Zinc plated Set No.

Stainless Set No.

Case Screws

03

09

014

015

017

021

022

041

043

Length

11/16

1 11/16

2″

1″

1 3/4

1 3/8

1/2

3/8

13/16

1948-53 KH CS15 CS15Q

7

2

3

1

3

1954-55 KH CS16 CS16Q

1

9

1

3

1956-57 KH CS17 CS17Q

3

9

1

1

4

1954-55 FH CS18 CS18Q

1

3

9

1

3

1956-58 FH CS19 CS19Q

3

9

1

1

4

Fours

Zinc plated Set No.

Stainless Set No.

Case Screws

03

09

010

011

017

021

041

044

Length

11/16

1 11/16

1 1/2

1 3/16

1 3/4

1 3/8

3/8

1 7/16

1932-33 SQ 4 CS20 CS20Q

4

6

1

1933-36 SQ 4 CS21 CS21Q

2

10

1937-58 SQ 4 CS22 CS22Q

9

2

4

1

Part No.

Description

Per

Model

Years

041

Drain screw, not included in case screw sets 1 S/arm 1954-58

049

Screw, countersunk, battery carrier to primary chaincase 2 S/arm 1954-58

0511

Bolt, inner primary case to gear cover 3 SQ 4 1937-58

0538A

Bolt, inner primary case to gear cover, top 1 SQ 4 1937-58

0604

Bolt, primary chaincase to frame, Plun/Rig 1 Sing/KH 1935-55

0604Q

Bolt, primary chaincase to frame, Plun/Rig, stainless steel 1 Sing/KH 1935-55

1545-37

Dowel for gear cover 2 SQ 4 1937-58

5414-33

Brake pedal stop plate 1 All 1933-36

5700-27

Primary chainguard 1 ABCDE 1927

5700-28

Primary chaincase, bare steel 1 ABCDE 1928

5700-29

Primary chaincase, bare steel 1 ABEFG 1929-30

5700-31

Primary chaincase, can use 5700-29, which is the same except that this one has inner and oil pipe built in N/A 1 Vert Sing 1931-32

5702-28

Clutch dome, bare steel 1 Not Colts 1928-30

5702-31

Clutch dome, chrome, it was probably only the VH that had a chrome dome, the others using the 5702-28 1 VB/VF/VH 1931-32

5702-36

Clutch dome, chrome 1 Sing 1936-38

5702-39

Clutch dome, chrome, plunger and rigid 1 Sing/twins 1939-55

5702-43

Clutch dome 1 W/NG 1943-45

5702-54

Clutch dome, chrome 1 S/arm 1954-58

5705-37

Clutch dome, chrome 1 SQ 4 1937-58

5710-36

Primary chaincase 1

5710-39U

Primary chaincase, outer 1

5710-54U

Primary chaincase, outer, swinging arm 1

5711-48UA

Primary chaincase, inner 1 KH 1948-53

5712-54

Primary chaincase, inner 1 FH 1954-55

5713-54

Primary chaincase, inner 1 KH 1954-55

5714-33

Outer primary chaincase 1 4F 1933-36

5714-37U

Primary chaincase, outer 1 SQ4 1937-

5715-33

Inner primary chaincase 1 4F 1933-36

5716-37

Spacer, chaincase to frame – can use 4720-56 but the wall is a bit thin, best to make your own to suit the gap, which tends to vary, that way the case is not put under any strain. 1 SQ 4 1937-58

5718-37

Bolt, primary chaincase lower fixing to frame with for brake pedal stop 1 SQ 1937-49

5718-51

Bolt, primary chaincase lower fixing to frame 1 SQ 4 1950-58

5718-51Q

Bolt, primary chaincase lower fixing to frame, SS 1 SQ 4 1950-58

5750-31

Oil filler cap 1 Inclined 1931-32

5750-32

Oil filler and inspection cap 1 All 1932-58

5767-39

Oil level screw 1 All 1939-58

5767-39Q

Oil level screw, stainless steel 1 All 1939-58

5770-31

Adjusting screw for rear chain oiler 1 All 1931-58

5770-31Q

Adjusting screw for rear chain oiler with spring, SS 1 All 1931-58

5772-31

Adjusting screw spring for rear chain oiler 1 All 1931-58

5854-29

Oil filler cap, screw type, no lettering, chrome – not correct but fills the hole 1 SQ4 1931-36
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