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JK McDonald JK McDonald is offline
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Join Date: Oct 2003
Location: Texas
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Garage
Nikasil Cylinders -

Hey Rufrob - It is never a good sign to open up the water pump cavity to find it's impeller broken into pieces. A serious high temp cycle can cause all sorts of problems for an aluminum 928 engine. The problem now is to assess the usable status of everything. Especially whether the unsleeved, silicon alloy engine block can be saved. I've read about a special process to over bore and re-etch the Nikasil cylinders to bring the silicon crystals back out as a wear surface again. There are much more experienced engine builders here that can probably make some recommendations to help you decide on your options at this point.

Good Luck, Michael
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1984 928S - "Miss Purdy"
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1975 911 Targa "Blue Who"
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Old 09-17-2018, 07:14 PM
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