Roller Bearings and the Y6-b

Fri Oct 11 09:31:44 EDT 2019

Ed 

   Found it. So all where  retro fitted.  On another note back in the early 70s I got several cabs rides between Bluefield and Roanoke with 

Radford Div. crews who had worked steam. I remember the conversation with them about the all roller bearing As , They described them as running 

 as smooth as a Swiss watch down the Bristol line.  The McGill “Multirol” needle bearings used in the valve gear.  Today is no longer available .  So I think when they needed some for 611 they machine them out for plain bearings.  Which work just fine with no more mileage than she gets.  

Larry Evans

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Sent: Friday, October 11, 2019 7:55 AM
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Subject: Re: Roller Bearings and the Y6-b

Larry - 

Look in the A book for a broadside of the front engine of the 1200.

- Ed King

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Sent: Thursday, October 10, 2019 4:32 PM

To: 'NW Mailing List' 

Subject: RE: Roller Bearings and the Y6-b

Must have retro fitted the earlier  As with rollers on the back ends of the eccentric rods . I found photos of all except 1200 with that application 

Larry 

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Sent: Thursday, October 10, 2019 2:02 PM
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Subject: RE: Roller Bearings and the Y6-b

Ed,

I have the same about the A’s and J’s.  I want to learn more about roller bearings on the back end of the eccentric rods.

Best back to you,

Bud Jeffries

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Subject: Re: Roller Bearings and the Y6-b

Bud - 

I’m talking about the back ends of the eccentric rods.  The McGill “Multirol” needle bearings were on the connections of the stuff within the valve gear frame and, as you say, were on all the Y’s after the 2125.  I believe all the A’s after the 1206 had them, too.  And, of course, the J’s.

Best - 

Ed King 

From: NW Mailing List 

Sent: Wednesday, October 09, 2019 10:37 PM

To: 'NW Mailing List' 

Subject: RE: Roller Bearings and the Y6-b

Ed,

When you mentioned roller bearings “on the back ends of the eccentric rods”, are you talking about the needle roller bearing on the valve gear?  If so, engines 2125-2200 had them.  Only the Y-5s and the first five Y-6s didn’t.

Bud Jeffries

From: NW-Mailing-List <nw-mailing-list-bounces at nwhs.org <mailto:nw-mailing-list-bounces at nwhs.org> > On Behalf Of NW Mailing List
Sent: Wednesday, October 9, 2019 9:50 PM
To: NW Mailing List <nw-mailing-list at nwhs.org <mailto:nw-mailing-list at nwhs.org> >
Subject: Re: Roller Bearings and the Y6-b

Bill - 

You have to understand something about the 2100-2200 class Y engines.  At the end, they all had equal capability on the road.  All the improvements that came out on the newest ones were retrofitted onto the older ones.  Folks tend to memorialize the Y-6bs because they were the newest, but the Y-5s could do everything the Y-6b could do.

As far as speed was concerned, driving wheel RPM was what counted, and the 2100s were capable of sufficient RPM to allow them to run 45-50 MPH without damage to themselves or to the track.  At 50 MPH the Y’s drivers were turning about 290 RPM.  They were so well-counterbalanced that this was no problem.  At 290 RPM the A was running 60 MPH but, of course could perform much beyond that.

The only roller bearings the Y-6b had that the older ones didn’t have were on the back ends of the eccentric rods.

As for the 0-8-0s, they were not comvortable over about 25 MPH (ancecdotal evicence from folks who were familiar with them) because their lack of a stabilizing lead truck allowed them to nose back and forth, although their machinery was probably good for much more than 25.

- Ed King

From: NW Mailing List 

Sent: Wednesday, October 09, 2019 5:00 PM

To: NW Mailing List via NW-Mailing-List 

Subject: Re: Roller Bearings and the Y6-b

For that matter, the S1a did not get roller bearings of any kind. I assume roller bearing rods had some connection with speed, since the first applications industry wide were on passenger locomotives.

Jim Nichols

On Wednesday, October 9, 2019, 01:30:25 PM CDT, NW Mailing List via NW-Mailing-List < <mailto:nw-mailing-list at nwhs.org> nw-mailing-list at nwhs.org> wrote: 

There's an old saying that goes "there are no dumb questions, only dumb answers."  But I'm afraid I am about to ask a really dumb question. 

We all know that the last five Class A locomotives had roller bearings on their main and side rods.  But the Y6-b continued to be built long after the last Class A.  Yet the Y6-b never had roller bearings on the side and main rods.  I assume the reason was because the Class A was a high speed locomotive while the Y6-b, being compound, was a low speed puller.

I'd be interested if any one knows the reason the Y6-b never got the roller bearing treatment.

Bill King

Arlington, Virginia

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