To really illustrate this point, we have attached the text that always goes with a cylinder head that we have repaired at a customer’s request: |
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Broken Cam Belt or Valve / Damage
Repaired Heads |
| (Advice - Notice to the Engine Builder / Mechanic) |
You have requested that this cylinder head be repaired and SAC Engineering has done exactly this. |
It is normally far more expensive to replace the damaged cylinder head with a new one. |
Repairing this damage is the economical route and while it is only one of the options available, you need to know the risks that go with this choice. |
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formal quotation! |
| Please take note of the following: |
This applies to all welded cylinder heads. |
· In order to repair this damage we have needed to expose the cylinder head to excessively high temperatures. |
Aluminium and / or cast iron welding generates heat that far exceeds any combustion temperatures. The head is normally pre-heated in an oven and is cooled down after all the welding and associated heat in its own natural way. The properties of the aluminium and / or cast iron have undergone changes and are no longer what they were or should be. |
· Hand finishing a combustion chamber after extensive welding is a time consuming process and while we will always attempt to match the combustion chamber to the original one, small changes can be found in the shape and size. |
We have found repaired combustion chambers to be one or two cc’s bigger or smaller than the original. To make them exactly the same is virtually impossible. |
· It is also very important to find the cause of the initial failure or it will more than likely happen again. |
· More often than not it is not the right choice to repair a damaged cylinder head when it requires extensive welding. |
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