4F and 4G Square Four Top End 1931-48

For gasket sets click here; individual gaskets click here; pistons, rings and liners click here.
A selection of used heads and cylinders are always available.
The outside diameter of all valve guides for the Square Four is 1/2″.
Torque head bolts to 15ft/lbs when using solid copper head gaskets on the 4G, if using Otto gaskets follow the instructions supplied.
Tappet settings inlet/exhaust: – 4G & MK II .006/.008; MK I .001/.001

Our newly manufactured rocker boxes are made in conjuction with the Ariel Owners club.

The new rocker box will come complete with a seal kit. However you can buy the seals individually if required.

Part No.

Description

Per

846-37

Rocker box with seal kit & instructions 1

1028-21

O ring, 1 inch, for 62-37 push rod tube 4

1031-20

Washer, thick steel, rocker box bolt 4

1031-21

O ring, 5/16, for 860-37 rocker box bolt & valve guide 12

898-21

Grub screw, rocker spindle 2

4F Overhead Cam SQ4 1931-36

Part No.

Description

Per

Years

48-32

Cylinder head 1 1931-36

418-31

Inlet and exhaust valve 8 1931-36

477-32

Valve guide, inlet and exhaust 8 1932-36

523-31

Valve spring, new free length 1.530” 8 1931-36

856-31

Cam cover 1 1931-36

862-32

Cam cover retaining nut, stainless 4 1931-36

912-31

Cam follower, re-profiled to order 8 1931-36

936-31

Tappet adjusting screw 8 1931-36

936A-31

Tappet adjuster locknut 8 1931-36

979-31

Camshaft bearing circlip, drive end 1 1931-36

975-31

Camshaft bearing, drive end 1 1931-36

977-31

Cam bearing, distributor end 1 1931-36

1030-36

Teddy bear casting (cap over end of cam) 1 1936

1960-31F

Camshaft, re-profiled, re-profiled to order 1 1931-32

1960-33F

Camshaft, re-profiled, re-profiled to order 1 1933-36

5172-31

Rocker and pressure gauge oil feed pipe 1 1931-36

4G Overhead Valve SQ4, 1937-48

Part No.

Description

Per

Years

PACK-ADV-002

Valve & guide pack A All

PACK-INTER-002

Top end overhaul pack A All

094

Exhaust manifold heat shield, screw 8 1937-48

094Q

Exhaust manifold heat shield, screw, stainless steel 8 1937-48

0131

Exhaust manifold stud, front 4 1937-48

0131Q

Exhaust manifold stud, front, stainless steel 4 1937-48

0132

Exhaust manifold stud, rear, stainless steel 4 1937-48

0135

Tappet guide locating plate stud 2 1937-48

0198

Carburetter mounting stud, left 1 1937-48

0199

Carburetter mounting stud, right, stainless steel 1 1937-48

24-37

Cylinder Also known as ‘door stops’ in the trade (More useful for holding the door open) 1 1937-48

25-37

Cylinder, 600cc 1 1937-40

47-37

Cylinder head, bare, various conditions 1 1937-48

135-37

Base nut, extended 1 1937-48

171-37

Head bolt 6 1937-48

171-37Q

Head bolt, stainless steel 6 1937-48

172-37

Head bolt, stainless steel 2 1937-48

200-37

Exhaust manifold 2 1937-48

210-37

Exhaust manifold nut 8 1937-48

210-37Q

Exhaust manifold nut, stainless steel 8 1937-48

212-37

Exhaust manifold heat shield, stainless steel 2 1937-48

225-37

Tappet guide block 4 1937-48

230-37

Tappet guide locating plate 2 1937-48

417-37

Inlet valve – 1000cc 4 1937-48

418-37

Inlet valve – 600cc 4 1937-48

455-37

Exhaust valve – 1000cc 4 1937-48

456-37

Exhaust valve – 600cc 4 1937-48

477-37

Valve guide, inlet and exhaust 8 1937-48

523-37

Valve spring, outer, new free length 1.750” 8 1937-48

540-37

Valve spring, new free length 1.500” 8 1937-48

565-37

Valve spring bottom collar 8 1937-48

595-37

Valve spring top collar 8 1937-48

640-32

Split cone (per half) 16 1937-48

655-34

End cap 8 1937-48

846-37

Rocker box with seal kit & instructions 1 1937-48

856-90

Rocker box cover, cooling fins & thicker than original use with 862-90 1 1937-48

860-37

Rocker box and cylinder head bolt 4 1937-48

862-90

Nut, securing 856-90 cover 4 1937-48

862-90Q

Nut, securing 856-90 cover, stainless steel 4 1937-48

900-37

Rocker spindle nut, stainless steel 2 1937-48

903-37

Rocker spindle fibre washer 2 1937-48

912-37

Rocker arm 8 1937-48

930-37

Lever end pin 8 1937-48

936-31

Tappet adjusting screw 8 1937-48

936A-31

Tappet adjuster locknut 8 1937-48

945-31

Rocker spindle thrust washer 6 1937-48

1012-37

Oil feed stud for rocker feed pipe 1 1937-48

1015-37

Rocker oil feed stud and nut, stainless steel 1 1937-48

1018-31

Dome nut, rocker oil feed on rocker box 1 1937-48

1024A-37

Throttle cable bracket on carburetter stud, stainless steel 1 1937-48

1032-39

Value guide rubber washer 8 1937-48

1810-37F

Cam follower (EXCHANGE) 8 1937-48

1821-00

Tappet cup, new and improved design, prevents push rod wear 8 1937-48

1858-37

Pushrod 8 1937-48

5172-37

Rocker and pressure gauge oil feed pipe 1 1937-48

5182-37

Lower double union on rocker feed pipe 1 1937-48

No products were found matching your selection, but we still might be able to help! Give us a call on 01986 894798 or email spares@draganfly.co.uk