12csvt engines

[Highland37]

I went to see 37025 leaving crossing the Culloden Viaduct yesterday and a fine sight it was. We also caught it at Aviemore and one thing apparent is what excellent condition it is in.

Now, I noticed that quite a lot of 37s' engines "hunt" when idling with the revs increasing and then dropping. But 37025 was constant with no hunting.

Why might that be?

 

[Murph]

37025 had a heavy rebuild fairly recently (the photos give the impression that it was a top quality job both inside and out, including the bits that very few people will actually see). I'd guess that the engine governor was probably rejuvenated as part of that, which is the subassembly responsible for regulating engine speed. In good condition, it generally shouldn't hunt significantly on an engine which is up to temperature. The fuel racks probably also got refurbished, eliminating any resistance in their bearings.

I believe the 12CSVT uses a hydraulic governor running off the engine's oil system, which can get clogged with miscellaneous gunge over time. Also, when the engine is cold, the oil is thicker, reducing the governor's ability to function. At idle, a more subtle variation of fuel control is needed (small adjustments, compared to those needed under power), which is difficult when the governor's operation is impaired.

 

[Harbornite]

37025 had a heavy rebuild fairly recently (the photos give the impression that it was a top quality job both inside and out, including the bits that very few people will actually see).

Was the overhaul carried out by RVEL on behalf of Bo'ness? It seems as though RVEL have also done high quality jobs on the DRS 37s.

 

[Murph]

Was the overhaul carried out by RVEL on behalf of Bo'ness? It seems as though RVEL have also done high quality jobs on the DRS 37s.

Going by http://37025.tumblr.com/ and https://realrail.smugmug.com/Trains/37025-restoration-Gallery, much of the work was done by Scottish Thirty-seven Group Ltd and SRPS at Bo'ness. Some bits must have been outsourced, but it looks like the preservation groups did a great deal of the work in-house.

 

[Harbornite]

Going by http://37025.tumblr.com/ and https://realrail.smugmug.com/Trains/37025-restoration-Gallery, much of the work was done by Scottish Thirty-seven Group Ltd and SRPS at Bo'ness. Some bits must have been outsourced, but it looks like the preservation groups did a great deal of the work in-house.

Good links. I regret not photting 025 when it was in the Birmingham area, the external appearance is spot on.

 

[Phil.]

Sorry, me again with another enquiry about modern youth words. The previous used the word photting. I've seen this on other threads. Now, is that modern parlance for taking a photograph or is(are) the poster(s) incapable of spelling photographed?

 

[Harbornite]

Sorry, me again with another enquiry about modern youth words. The previous used the word photting. I've seen this on other threads. Now, is that modern parlance for taking a photograph or is(are) the poster(s) incapable of spelling photographed?

I'm fully aware of how to spell photographed. :roll:

I didn't know this was the bloody magna carta. You're a pedantic one aren't you, no one else would care about such a silly little issue. The word "photted" is used quite often on some photography sites and is a portmanteau of spotted and photographed. Not that hard to grasp, is it?

Also, if you are so concerned by "youth words" then start another thread and don't drag this thread (which is clearly about the engines in 37s) off topic.

 

[gsnedders]

Going by http://37025.tumblr.com/ and https://realrail.smugmug.com/Trains/37025-restoration-Gallery, much of the work was done by Scottish Thirty-seven Group Ltd and SRPS at Bo'ness. Some bits must have been outsourced, but it looks like the preservation groups did a great deal of the work in-house.

Pretty much entirely done in-house. With regards to it after leaving Bo'ness:

The loco left Bo’ness under its own power on January 18th and initially spent a period at Barry working two or three days a week either on light engine runs or hauling empty coal wagons to give trainee drivers handling experience.

 

[matchmaker]

I'm fully aware of how to spell photographed. :roll:

I didn't know this was the bloody magna carta. You're a pedantic one aren't you, no one else would care about such a silly little issue. The word "photted" is used quite often on some photography sites and is a portmanteau of spotted and photographed. Not that hard to grasp, is it?

Also, if you are so concerned by "youth words" then start another thread and don't drag this thread (which is clearly about the engines in 37s) off topic.

Take a deep breath and chill...

 

[Harbornite]

Take a deep breath and chill...

It's hard to chill during a heatwave

 

[50041]

the external appearance is spot on.

I can indeed vouch for it being spot on. Here's what it looked like when I first took a photo of it in back 1984 (primarily because I'd never seen a LL 37 before at the time):

http://www.englishelectric.org.uk/p1012715457/h30931ff2#h30931ff2

 

[Highland37]

Wow Inverness Station looks a lot better in that picture than the run down place it is these days. Let's hope the "renovation" will be good.