My machine shop is cleaning a S4 crank for one of my engine builds. We want to clean out the sludge ports on the crank but have concerns about drilling out the plug pins on my nice crank. We are looking for a junk crank we can practice on first. Let me know if there is one available in the PDX area.?
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Picture of plug:
I'm also looking for guidance on how best to remove the?plug and reseal them. My understanding is that the plugs are hardend?steel pins pressed in with an aluminum sleeve. The hardened steel is very difficult to drill out, so tips are appreciated.?
My understanding replacing the plugs require tapping out threads into the impossibly hardened steel crank and then using a threaded plug, preferably a tapered thread.?
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Any thoughts and recommendations here are appreciated.
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Thanks for you thoughts in advance,?
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1992 Porsche?928 GTS Japan market
Michael Benno