Necessity of Head Planning in Head Gasket Replacement: Dealing with Bent Ends and Valve Holes

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#31 17521580 27 Oct 2018 18:12

neket neket

Level 11

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Post #31
17521580 27 Oct 2018 18:12

robokop wrote:
Well - it was going to be an interesting substantive discussion - as you can see some people let their nerves go and resorted to rather strange arguments. I close the thread as exhausted - before the situation is repeated.

For the sake of completeness, what Opel on this :

"robokop" please write the title of the source from which you pasted the clipping. I'll be happy to read the whole thing.

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#32 17521642 27 Oct 2018 18:43

ftp.kowal ftp.kowal

Level 36

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Post #32
17521642 27 Oct 2018 18:43

After all, it was in almost every single "self repair" type book. In addition, regarding heads, Volkswagen does not provide for its planning. In a diesel, the combustion chamber will not change when the head is planned. On indirect injection the combustion chamber is in the head no one when grinding it reduces it. On direct injection the chamber is in the piston when grinding no one reduces it either. The head has its own parameters, which should be preserved when machining. After the head is planned, the "cavity" of the valve plugs should be checked and possibly corrected to the repair dimension. Gasoline has combustion chambers in the head, but there are no different thicknesses of gaskets for it.
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Topic summary

The discussion centers on the necessity of head planning during head gasket replacement, particularly when dealing with bent heads. Participants express differing opinions on whether planning is essential, with some arguing it is necessary for correcting non-flatness, while others suggest that a thicker gasket can be a viable alternative. The process of planning involves removing material to ensure a flat surface, which can affect the combustion chamber volume and compression ratio. Concerns are raised about the potential for misalignment of valve holes and the risk of damaging components like camshafts if the head is not properly aligned. The consensus leans towards caution, recommending that if the head is significantly bent, replacement may be preferable to planning. Additionally, the discussion highlights the importance of measuring piston protrusion to select the appropriate gasket thickness after planning.
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