Re: Mercury Mark 6

[green-thumbs]

A GOOD machinist could carefully indicate case so as to recut thread…very close work to
get everything aligned within original specs. It can be done but given the number of Mark 6
made probably far less expensive to find a good used replacement even though such damage
may be a weal point of the design. If you are the machinist probably just an interesting
job on lathe or mill. BYB thread cutting both internal and external is usually done with a
60 degree single point tool. Tap and dies in larger sizes tend to be cost prohibitive
if infrequently used. Given the irregular shape of gear cases the first step to getting the
alignment right might be building a holding device.
Opinion not Fact
Louis
I dabble in machining. I know a great welder and a great machinist but given the time
and cost involved a good used replacement would make more sense. There several
ways to determine the thread diameter and pitch…helps to have a basic understand thread
standards, cutting threads requires paying close attention to what you are doing…THE
problem is obtaining an accurate set up so threading aligns with case and the existing
thread in case. It can be done and there are more than a few in hobby that can do that
level of work.