[SEL] bearing clearances

[Elden DuRand]

Peter:

I've been successful with brass/bronze bearings by fitting them just a shade on the snug side then, when first running them, monitor for tightness and heat.  When they get noticeably warm or begin to bind, stop and let them cool.  Lubricate again and repeat the process.  When they're broken-in, they will run continuously without undue heating.

Take care - Elden
http://www.oldengine.org/members/durand 

> -----Original Message-----
> From: sel-bounces at lists.stationary-engine.com
> [mailto:sel-bounces at lists.stationary-engine.com]On
>  Behalf Of Peter Lowe
> Sent: Thursday, March 05, 2009 11:32 PM
> To: ATIS; oldengine.org
> Subject: [SEL] bearing clearances
> 
> 
> Hi All
> 
> I know we have spoken about this before, but I 
> did not log the answers.
> 
> I am making two (2) cylindrical one piece 
> bearings, 4.500" long, crankshaft diameter 
> 1.450", how many thousanths of an inch clearance 
> should I allow for when boring out the bearing to 
> take the crankshaft? I have brand new crank arms 
> and want a nice snug fit with no play, but not 
> too tight so it will seize, the correct clearance 
> in other words. Lubrication on this early model is grease.
> 
> Also does anyone in Oz know of a source for 9/16" 
> square steel bar. The early R&V's had all square 
> head bolts and will have to make all new ones, NO 
> they are not set screws etc etc etc, we have been 
> there. These bolt are NO longer available, will 
> post that info to my web site tonight.
> 
> Regards
> Peter, Oz