Cylinder Bore Deglazing – Purpose – Crosshatch – Roughness And Angle

Cylinder Bore Deglazing - Purpose - Crosshatch - Roughness And Angle
Cylinder Bore Deglazing - Purpose - Crosshatch - Roughness And Angle

The cylinder bore deglazing process is basically; removing the glaze from your engines cylinder walls.

Thats why, Having the proper finish is extremely important; in assisting with proper piston ring lubrication.

So, Without proper lubrication, heat and friction, can cause excessive engine wear. In contrast, Too much lubrication, will cause excessive cylinder leakage and oil burning.

Cylinder bore deglazing is not that hard to do, If you follows the proper instructions.

So, To keep your engine running at peak performance; the cylinder bores need the proper oil-retaining surface finish. But, Over time the reciprocating movement of the pistons, can glaze the cylinder walls.

Cylinder Bore Deglazing - Purpose - Crosshatch - Roughness And Angle
Cylinder Bore Deglazing – Purpose – Crosshatch – Roughness And Angle

As a result, The surface finish becomes too smooth; and will not hold the oil as effectively. Even more, This cylinder wall glaze affects more than just lubrication.

This glaze also affects:

  • The performance of your piston rings
  • Other engine components that seal the combustion chamber
  • Proper heat transfer
  • The control of oil consumption

The Purpose Of Cylinder Bore Deglazing

So, Cylinder bore deglazing is; the process of conditioning the surface finish of the cylinder walls. As a result, Allowing for the proper lubrication; of the piston rings during engine operation. In addition, To promoting proper lubrication; cylinder bore deglazing supports, piston ring seating and sealing.

The process of conditioning the surface finish of the cylinder walls
The process of conditioning the surface finish of the cylinder walls

So, You need a very thin layer of oil between; the edge of the piston rings and cylinder wall. If there was no oil to lubricate the constant contact with the cylinder wall; there would be too much friction. As a result, Both the rings and cylinder would wear out quickly.


Using A Ball Hone In A Reversible Drill

One of the advantages of using a ball hone in a drill; is that you can run the drill backwards. So, If you deglaze in the opposite direction (counterclockwise) it will do a nice job of deburring the surface.


Proper Crosshatch Angles

The correct angle for crosshatch lines to intersect is approximately 45 degrees:

Crosshatch lines to intersect is approximately 45 degrees
Crosshatch lines to intersect is approximately 45 degrees
  • So, If the crosshatch angle is too steep, the rings can pump oil or experience excessive rotation; which will accelerate wear in the rings and piston lands.
Crosshatch angle is too steep
Crosshatch angle is too steep
  • In contrast, If the crosshatch angle is too shallow; it can have a ratcheting effect as the rings pass over the valleys; preventing the rings from receiving proper lubrication.
Crosshatch angle is too shallow
Crosshatch angle is too shallow

Cylinder Bore Deglazing Methods

There are two methods used to deglaze cylinder walls; either rigid stones or a flexible ball hone. If there is no wear in the cylinder, use the ball hone.

Deglazing Cylinder With Ball Hone
Deglazing Cylinder With Ball Hone

Correct cylinder finishes can be achieved; with either system, if used correctly. Because, there are different methods; there are different instructions as well. So, Above all, Follow the instructions for the equipment you are using.


Cylinder Roughness And Angle

Substantial controversy exists on the correct cylinder roughness; for proper seating of piston rings. Mainly, Because of the different finishes required; when using a chrome, moly, or plain cast iron ring. So, It is important to follow what the ring manufacturer; says for proper cylinder finish. Because, Different rings materials require different finishes.

Cylinder Wall Finish
Cylinder Wall Finish

Most manufacturers say the angle of the scratches in the crosshatch pattern; should be about 45° to each other. Or, Equal to about 22° to 32° of the horizontal deck surface. The crosshatch angle should be the same; throughout the length of the cylinder; and not flatten out at either end.


Cylinder Block Cleaning

The single most critical factor of any cylinder refinishing job; is the cleaning of that cylinder, after the deglazing operation. Above all, No engine component will tolerate dirt! So, Deglazing cylinders leaves two types of “dirt” on the cylinder walls; honing stone residue and cast iron dust.

Cleaned Engine Block
Cleaned Engine Block

Proper cylinder cleaning consists of; a thorough scrubbing of the block. Always, with hot, soapy water taking care to clean the surface; under the cylinder facing the crankcase. Finally, A rinsing with hot water, drying; and light coating of oil to prevent rust.


Conclusion

Finally, For detailed deglazing questions it is wise; to contact the manufacturer of your specific equipment. They are experts in metal finishing; and of course completely understand their own equipment.

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