[SEL] O/T Steam main bearing babbitt

[Dave Otto]

Hi Rick

How is the fit on the pin where the rod connects to the cross head? And play
there could cause a knock that may be amplified through the rest of the
parts. Any more than a thou or so and you may be hearing it.

If the mains are in good shape I would think that a little scraping would
bring them in to a good running fit.

I would look at the cross head for the source of the knock.

Dave

Dave Otto
Boise, Idaho
USA


> -----Original Message-----
> From: sel-bounces at lists.stationary-engine.com [mailto:sel-
> bounces at lists.stationary-engine.com] On Behalf Of Richard Strobel
> Sent: Tuesday, October 02, 2007 5:35 AM
> To: sel
> Subject: [SEL] O/T Steam main bearing babbitt
> 
> 
>   G'day all;
>     Friend Corky and I are at our wits end trying to find a very obnoxious
> knock(s) on both dead centers of our vertical Wachs engine.  This list has
> such great experience with main bearing babbitt, I wanted to ask here.
> 
>   Here's the engine and as you all probably know a "Single Simple" fires??
> on both sides of the piston;
> 
> http://home-and-garden.webshots.com/photo/2308067910039077051Ronfyj
> 
>   Dial indicator on end of cs shows .003 slop.  This may indicate a bend
> crank or just out of round..I would think this would be tolerable.
> 
>   M/B babbitt looks new and shows no sign of ever being scrapped...one can
> still see some ripples.  There is some side to side/axial slop in both
> main
> bearings.  Yes, this would have showed up on the dial indicator had we
> loaded one side.
> 
>   Now the big question as the crank is going to the crank doc and he can
> flux weld and machine to any diameter.
> 
>   Do I have him flux weld and machine to a diameter so there is no side to
> side/axial slop and if so, how do I determine what diameter to use?
> 
>   Also, the rod inserts show wear on one side towards the solid flywheel.
> How do I assure this crank is level?  This has been mentioned before..eh,
> Curt.. somewhile back.
> 
>   I really don't want to pour new babbitt.
> 
> 
>   Thanks much...after this endeavor, I'll be headed back to the 4.5hp New
> Way in which I'm always looking for a mixer.
> 
> Best Regards,
> RickinMt.
> 
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