My Perkins 4cyl 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 cyl 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 parrel liners
  • – The early type Cylinder blocks have flanged and parrel 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 cyl 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 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 Diam:                           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 Parrel 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:                                      4.1045-4.1005″

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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