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How to Fix a Hole in Your Cylinder Block

There is only really one way to fix it a hole in a cylinder block and that is to replace it.

If you have a Perkins 212 , 236 or 248, Noordeman Diesel may have the answer to your problem.

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

Cylinder blocks

  • 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 (non flanged liners are known as parallel liners)
  • The early type cylinder blocks have flanged and parallel liners fitted . The top of the liner protrudes and this in known as the fire ring.
  • Fire rings type liners require top set u5lt1014 click here for the link
  • The later type 4-236 blocks have flanged liners. These have no fire ring and the top on the liner is flush with the top of the cylinder block.
  • 236 flanged liners are available  STD and over size, you can get .010 and .040 over size backs.
  • Non-fire ring type blocks require a different top gasket set U5lt1004 click here for the link
  • You can convert a chrome liner block to a cast liner block, by changing the counter bore depths.


  • 212 crankshaft has a different stroke to a 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.
  • Splined nose or non-splined nose.
  • Non spline nose cranks have 3 bolt holes – splined nose has 1 bolt hole.


  • 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 cylinder heads the same and interchangeable
  • All valves and springs are interchangeable

More Specifications below

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 Parrallel liners”  

Parent Bore:                                      4.0625-4.0635″

Recess Depth:                                           N/A

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 Flangless liner Parralell

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″

If you have more ideas or suggestions to assist send us an email to or call 08 9350 6566

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