[Steam-engine] Wachs Knock

[Richard Strobel]

Francis, we've looked at that many times and cannot find any repairs or 
slop.  It is completely apart now and we're starting from scratch.  First to 
the crank doc and get it assessed and repaired as necessary and then work 
up.  It is a heavy knock on both centers and one would almost suspect metal 
to metal contact.  Three of us ole retired helicopter mechanics have looked 
at it with no joy.

  I will keep your suggestion in mind tho..and re-check when we re-assemble.

Thanks much
Rick






----- Original Message ----- 
From: "Francis Orr" <steam.boat at verizon.net>
To: <steam-engine at lists.stationary-engine.com>
Sent: Monday, October 01, 2007 10:56 PM
Subject: [Steam-engine] Wachs Knock


> Rick,
>
> Jim Mackessy's remarks reminded me of a 4 X 4 Upton marine engine we had 
> in a boat in the 60s. It had a knock that sounded like a sledge hammer. 
> After a complete rebuild, it quieted down but eventually came back. To 
> make a short story out of it, we found the knock was coming from the 
> connecting rod sliding left and right on the wrist. Further examination 
> showed the cause of this was that the top of the cast column (cast on one 
> side, steel on the other) had been broken at one time and welded back 
> together. Therefore the piston rod and the connecting rod were not in 
> alignment. Machining the top of the cast column and redoing the wristpin 
> brasses fixed the knock.
>
> Francis A. Orr
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