Plunger and Rigid Frame

For stands click here, crash bar fittings click here.

Ariel’s version of plunger rear suspension was designed by Frank Ansty (hence the term ‘Ansty rear suspension’) in 1939 and was offered as an option on all models except OG and OH. It became standard fitment on the Square Four from 1953. Considered by some people to be the Achilles heel due to the high rate of wear of the 12 bushes, which will have to reamed after fitting. There are 3 types of centre spindle arrangement, which are all interchangeable, so it is wise to check which one you have before ordering parts.

The 1939 to early 1951 set up consists of a bolt type centre spindle with a grease nipple on top, a recess part way down and a separate guide tube with a small hole in the side for the grease to pass through. The rear wheel adjusters changed from a snail cam to more conventional adjusting bolts in 1950 and in 1951 a grease nipple was added to the link bolts.

Late 1951 to early 1952 saw the deletion of the centre spindle greasing arrangements but these parts are otherwise the same and are fully interchangeable. The grease now entered via a nipple on the sliding member although there was no change in part number.

The late 1952 to 1958 set up consists of a large diameter bar with a thread at both ends and no separate guide tube; this can be fitted to earlier models but note that the top cap is different. The earlier one is aluminium alloy with a boss on the underside and the later type is a steel pressing without a boss.

Rigid Frame

Part No

Description

Per

Years

001

Grease nipple, straight AR

081

Screw, cable clip to frame 1/2 1932-58

4842-32

Cable clip on steering head (screw is 081) 1/2 1932-58

4950-??

Rigid frame, used ones rarely available, but please enquire anyway 1 1898-55

5740-30

Rear wheel adjuster 2 1930-55

5740-30Q

Rear wheel adjuster SS 2 1930-55

5744-30

Rear wheel adjuster lock nut 2 1930-55

5744-30Q

Rear wheel adjuster lock nut Stainless steel 2 1930-55

Plunger Frame

Part No

Description

Per

Years

001

Grease nipple, straight AR

081

Screw, cable clip to frame 1/2

0741

Bolt for rear stand bracket 2 1940-58

0741Q

Bolt for rear stand bracket, stainless steel 2 1940-58

4337/8-39Q

Snail cam wheel adjusters, pair SS 1 1939-49

4842-32

Cable clip on steering head (screw is 081) 1/2 1932-58

4953-39U

Plunger frame, used ones sometimes available, please enquire 1 1939-58

4955-39

Centre bolt, stainless 2 1939-51

4955-52

Centre spindle (not used by all 1952 models, see above) 2 1952-58

4957-40

Centre spindle lower nut 2 1939-52

4957-40Q

Centre spindle lower nut SS 2 1939-52

4957-46

Centre spindle lower nut 2 1952-58

4957-46Q

Centre spindle lower nut with washer SS 2 1952-58

4957-53

Centre spindle upper nut, chrome 2 1952-58

4957-53Q

Centre spindle upper nut, with washer SS 2 1952-58

4958-39

Top cap, alloy, not available but later type can be used with spacer 2 1939-51

4958-52

Top cap, chromed steel 2 1952-58

4960-39

Guide tube (The originals were hard chrome plated, these a’int) 2 1939-52

4960-51

Guide tube 2 1951

4962-40

Rubber bump stop 2 1939-52

4962-53

Rubber bump stop 2 1952-58

4966-39

Sliding member bush 4 1939-58

4969-39

Main spring, sidecar, .312″ wire, recommended for solo use 2 1939-58

4973-39

Shroud, large outer, SS 2 1939-58

4975-39

Shroud, small inner, SS 2 1939-58

4984-52

Stirrup bolt 2 1939-58

4984-52Q

Stirrup bolt SS 2 1939-58

4986-39

Stirrup bolt bush 4 1939-58

4988-39

Stirrup bolt lock nut 2 1939-58

4988-39Q

Stirrup bolt lock nut SS 2 1939-58

4989-50

Rear wheel adjuster 2 1950-58

4989-50Q

Rear wheel adjuster with nut SS 2 1950-58

4990-39

Stirrup bolt knurled washer 4 1939-58

4990-39Q

Stirrup bolt knurled washer SS 4 1939-58

4992-39

Link plate, inner, small hole, chrome 2 1939-58

4992-39Q

Link plate, inner, small hole, chrome SS 2 1939-58

4994-39

Link plate, outer, large hole, chrome 2 1939-58

4994-39Q

Link plate, outer, large hole, chrome SS 2 1939-58

4996-51

Link plate bolt 4 1939-58

4996-51Q

Link plate bolt with washer SS 4 1939-58

4998-39

Link plate bolt bush 4 1939-58

5503-40

Rear stand bracket, RH 1 1940-58

5504-40

Rear stand bracket, LH 1 1940-58

S1-2

Rear wheel adjuster lock nut 2 1950-58

S1-2Q

Rear wheel adjuster lock nut, stainless 2 1950-58

S1-3

Nut, link bolt 4 1939-58

S1-3Q

Nut, link bolt, stainless 4 1939-58

S1-4

Nut, rear stand bracket bolt 2 1939-58

S1-4Q

Nut, rear stand bracket bolt, stainless 2 1939-58

S19-3

Washer, link bolt 4 1939-58

S19-3Q

Washer, link bolt, stainless 4 1939-58

S19-4

Washer, rear stand bracket bolt 2 1939-58

S19-4Q

Washer, rear stand bracket bolt, stainless 2 1939-58

S19-8

Washer for centre spindle, top and bottom 4 1952-58

S19-8Q

Washer for centre spindle, top and bottom SS 4 1952-58
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