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

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.

Crankshafts

• 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.

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 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 sales@noordeman.com.au or call 08 9350 6566

We are here to help and keep this knowledge around.