Whenever I read anything about the FA-2, it always followed that the model “suffered mechanical difficulties” or similar but no examples are given. What were the top 2-3 mechanical difficulties that prevented the FA-2 from being “reliable”?
I presume when you mention FA-2 you’re ruling out the early ‘teething troubles’ with the engines, like the original cast cranks that didn’t hold up and that apparently caused damage requiring engine replacement, and the original GE turbos that worked fine at 30,000 feet but not so well in a carbody. The water-cooled Alco-designed replacement worked somewhat better, but UP said in 1953 they were not ordering new Alco road power because even the revised turbo was causing manifold failures in heavy fast road service in many UP locations in the West.
One issue with the 244 was its mounting setup – only two mounting ‘feet’ were on the block, the other two being on a removable part at the generator end. The 251 made much of feet well placed at the ‘nodal points’ as a great design improvement…
The 244 had comparatively long injector lines inside the engine head cover, with high peak firing pressure (unlike the EMD unit injector, which developed pressure only within the injector itself). When, not if, a line leaked the fuel would go invisibly into the sump and dilute the lube oil. New Haven had to go to checking viscosity every 15 days or so, and that worked, but the ‘competition’ didn’t have that problem.
Apparently the electrics gave trouble over the years, and while Alco did figure out a reasonable rebuild by the late '50s not many really cared enough.
A very real issue was the parts and service arrangement. EMD had lots of parts ready and a service department that would quickly provide them. At Alco, apparently, there were problems getting orders placed and then perhaps several weeks’ wait for the stuff to get there.
I do not have anything definitive on there being difficulty with the cranks on the 12-244 after the change to forged, but some discussions seem to state there were outside of other problems, including the tongue-and-groove design of main caps and the aforementioned lube is
One issue that helped drive their lack of support responsiveness (Which helped EMD significantly) where post sale support was concerned, was Alco and GE fighting when their alliance was still active over where the responsibility rested for supporting their customers.
They’d fight with each even over basic things like the division of labor when a customer had difficulties (i.e., should it be a GE employee being paid by GE going out to help resolve difficulties or an Alco employee).
The post sales support was such a problem for many of Alco’s customers that it helped EMD coin a new marketing slogan for their sales department, which I believe was “one builder, one responsibility”.
Thank you. I didn’t know any of this, so you “more” than answered my question. Thanks!!!
I presume when you mention FA-2 you’re ruling out the early ‘teething troubles’ with the engines, like the original cast cranks that didn’t hold up and that apparently caused damage requiring engine replacement, and the original GE turbos that worked fine at 30,000 feet but not so well in a carbody. The water-cooled Alco-designed replacement worked somewhat better, but UP said in 1953 they were not ordering new Alco road power because even the revised turbo was causing manifold failures in heavy fast road service in many UP locations in the West.
Union Pacific did not have that mant Alco road locomotives. The big purchase was 88 FA-1 and FB-1 units, with 11 RSC-2 units for branch lines and 5 RS-2s, also used on branch lines. Cynthis Priest in The UP Diesel Volume 1 indicates that UP chose not to replace the air cooled turbochargers in the FA/FB units. She seems to know something about the 244 from her description. there are photos of RSC-2s in the late 1960s showing the distinctive offset stack associated with the air cooled turbocharger and also on one RS-2 in 1959. Other units of both types did show the transverse water cooled turbo stacxk around the same time. So perhapps UP were referring to a modified air-cooled turbocharger.
It is suggested that UP spent some time tuning the 244s to overcome the problems and it is possible that even a 244 with an air cooled turbo could be made to work, at least until the 1960s.
I’m not sure when the water cooled turbo actually became available as a retrofit. The earli
My impression is that the DL-600 demonstrators of 1954 (i.e., the RSD-7) introduced the new design turbocharger, after the dissolution of the Alco-GE partnership.
The references I remember do indicate the water-cooled turbo was an Alco, not GE, design.
It had literally never occurred to me that the water-cooled turbo had not been put in process long before an introduction on the 244H. Comes of not reading critically enough, I guess.
My impression of the air-cooled design is somewhat the same as the 38D8⅜ OP in the Erie-builts: furnish it enough cooling at all times, perhaps specifically in the interstate bearing oil, and it would run reasonably well. UP ran them in an enclosed carbody in seriously hot weather; if they thought about enhanced ‘summertime’ cooling mods I’d like to know (Cynthia Priest would be a logical source but I haven’t found a copy to read yet).
Be interesting to see if and how this experience governed the subsequent EMD turbocharging experiments on UP.
Here’s an old thread with a bit more info:
http://cs.trains.com/trn/f/741/t/153041.aspx
As for EMD, one would think that their experience developing the 567 would have left a lasting impression regarding the importance of cooling internal moving parts, the addition of a separate piston cooling oil pump did a lot to improve engine reliability over the Winton 201 designs.
The turbo lube pump is directly wired to the batteries on most if not all EMD locomotives, so it will continue to run for some time even if the engine is shut down and the main battery switch opened.
Why look, there were two water-cooled turbo design families, one from GE and then one from Alco a year later. Would be interesting for someone who knows to explain detail-design differences.
Alco always used one really big turbo, without pre-spin, and that largely accounts for the smoke…
Perhaps EMD saw less difficulty with their turbo because the overrunning-clutch drive took over on spindown and that may have kept circulation through the critical bearings adequate.
When the Chicago & North Western Historical Society toured the Fairbanks Morse factory and headquarters in Beloit WI a few years ago - yes they are still very much in business, just not the railroad business – I was surprised to see and learn that one of their major product lines is the ALCO 251 diesel engine. They had some on display with cut-aways showing how they work. They also had display cut-aways showing how the Fairbanks Morse opposed piston engine works by the way, and an historical section of displays and photos that pays full tribute to their railroad background. (and their scales which were used by many railroads as well as grain elevators and others).
Interestingly on their website they make this comment about the ALCO 251: “The Fairbanks Morse ALCO 251F engine is renowned worldwide for efficient and reliable power in the most demanding stationary applications.” Emphasis added by me.
Dave Nelson