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 |
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