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Perkins 212 – 236 -248 What is the Difference?

My Perkins 4cylinder block has a hole in it?

Basic specs on a  Perkins 4-212 , 4-236 and 4-248

Engine type 212 236 248
Bore size 3.8750 3.8770 3.9750
Stroke 4.50 5.00 5.00
Square back Non-stress block Yes Yes Yes
Flanged back stress block No Yes Yes
More specific specifications at the bottom of the blog

Cylinder blocks difference

  • – You can use a 212 cylinder block to make a 236 or a 248 Perkins or vice versa, they all can be modified to replace each other.
  • – You can convert a 4-236 to be a 248 but you won’t really notice that much difference in extra HP. Fuel system can stay the same.
  • – There are flange liner blocks and non-flange liners e. Non-flanged liners are known as parrallel liners.
  • – The early type Cylinder blocks have flanged and parrallel liners fitted. the top of the liner protrudes and this is known as the fire ring.
  • – Fire rings type liners require top set u5lt1014.
  • – The later type 4-236 blocks have flanged liners. these have no fire ring and the top of the liner is flush with the top of the cylinder block.
  • – 236 flanged liners are available  STD Oversize backs you can get .010 and .040 oversize backs.
  • – Non-fire ring-type blocks require a different top gasket set U5lt1004.
  • – You can convert a chrome liner block to a cast liner block by changing counterbore depths.
  • – 2 hole or 4 hole lift pumps make no difference.
  • – You can fit a lip seal or rope seal cranks to either you may have to drill to the bolt holes.
  • – If you want to swap the crankshaft from balance weight to a non-balance weight you may run into a problem with the oil pump.
  • – If swap the oil filter from one side to the other of the block you will need to change crossover tubes/ relief valve from the oil pump.

Crankshafts

  • 212 crankshaft has a different stroke to 236 and 248.
  • 236 and 248 crankshafts are the same, however there are some variations.
  • There are balance weight and non-balance weight types.
  • Lip seal or rope seal ( if swapping seal types you may have to drill out the rear of the cylinder block to suit.)
  • Splined nose or non-splined nose.
  • Non-spline nose cranks have 3 bolt holes – splined nose has 1 bolt hole.

Conrods

  • All the conrods are the same and interchangeable.
  • All small end bushes are the same.
  • Conrod nuts and bolts are the same.

Cylinder Heads

  • 212, 236, 248 all the cylinder heads the same and interchangeable.
  • All valves and springs are interchangeable.
212 Flanged Cast Iron Liners

Parent Bore Diameter:                    4.0625-4.0635″

Recess Depth:                                   0.150 -0.152″

Outside Diameter:                           4.0645-4.0655″

Interference Fit:                               0.001 -0.003″

Piston Height:                                    0.015 -0.021″

Finished Bore Diameter:               3.877 -3.878″

236 Flanged Cast Liners

Parent Bore:                                      4.0625-4.0635″

Recess Depth:                                    0.150 -0.152″

Outside Diameter:                            4,0645-4.0655″

Interference Fit:                               0.001 -0.003″

Piston Height: (above)                    0.003 -0.010″

Finished Bore Diameter:               3.877 -3.878″

236 Parallel Liners

Parent Bore:                                      4.0625-4.0635″

Recess Depth:

Outside Diameter:                           4,0645-4.0655″

Interference Fit:                               0.001 -0.003″

Piston Height: (above)                    0.003 -0.010″

Finished Bore Diameter:               3.877 -3.878″

248 Flanged Cast Liners

Parent Bore:                                     4.1045-41005″

Recess Depth:                                   0.150 -0.152″

Outside Diameter:                           4,0645-4.0655″

Interference Fit:                                0.001 -0.003″

Piston Height: (above)                    0.003 -0.010″

Finished Bore Diameter:               3.877 -3.878″

248 Flangeless Liner

Parent Bore:                                      4.0615 /4.0625

Outside Diameter:                           4.0655-4.0665″

Interference Fit:                               0.003 -0.005″

Finished Bore Diameter:               3.9875-3.9795″

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