Help needed to identify a DMU Hornby

[Australian model rail road]

I just bought a two car DMU railcar the running number is M79079 made in Britain it is green the power bogie has a double worm drive not a ringfield motor how to remove the power bogie or body shell to service the motor as not sure and do not want to damage anything in the process I can not see any screws so it must be clips I think any help welcome

[Urbarm8]

According to Hattons its a R.157 railcar. Service sheet number 60

 

http://www.hornbyguide.com/service_sheet_details.asp?sheetid=135

[LCDR]

The motor can be removed by first removing the roof which is secured by a small countersunk screw embedded in the roof towards the rear of the coach,after unscrewing you need to unclip the back of the roof using a screwdriver in the clip slot inside the gangway connector, pull up the back of the roof until it is clear of the body  and then slide the roof up and backwards, which will expose a larger screw which holds the motor in place and allows it to pivot.

See pictures

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[Australian model rail road]

Thank's very much for your help

[Rana Temporia]

The actual prototype for the Hornby Metro-Cammel DMU wasn't the standard class 101 that lasted right to the end of first generation of DMUs on British Railways but a small class of non-standard units that were made very early on. They only operated in the Manchester/Bury and East Anglian areas (I think).  They had the early multiple control type and couldn't work in multiple with the later fairly standard blue square classification. 

The later units were very similar but didn't have the cowl around the buffer beams or the same type of multiple control fittings. I don't think any of the early units had central cars. I will check later when I have access to my books. 

[Australian model rail road]

I bought this on ebay it runs nicely at slow speed but when you crank up the speed it is quite noisy  What year would this be produced 60's or early 70's  I would think, it is in  good condition it had been stored for years according to the seller I just wantit to run better and quiter at speed if possible Also it has had headcode lights fitted at some stage which work. Finally what was this type of motor called

[Going Spare]

R157 with illuminated headcode was produced between 1974 and 1978.  It may be that some of the noise is being created by the knurled wheels running on the rail surface (if your unit does not have the later smooth-treaded wheels).

[LCDR]

The original Triang version (R157) made later by Hornby was reduced in length, so cannot be considered a scale model. Hornby later adopted the Lima model for recent production.

[Rana Temporia]

The Tri-ang (later hornby) model is indeed way too short but it is easy to identify the prototype so someone did a good job of scaling it down. The motor bogie wheelbase is also too long. Originally it had normal coach bogies but later had Pullman bogies which looked more like the real thing. The motor bogie frame was the EMU one without the pick-up shoes and was also used in the Blue Pullman. The actual mechanism was exactly the same as the ones in the TC diesel and electric locos, dock shunter etc. Which had larger dimmer wheels and I have found examples of both with the wrong wheels fitted at some point in their past. 

 

The later version with the big illuminated sign above the central window was the last version made and SHOULD have a power bogie with the later scale smooth wheels and black plastic cogs But again they did get swapped around sometimes. 

 

The real units never carried the large central head code, the nearest ones that had something similar were the Met-Camm class 111 units which had a four digit head code and as a result the destination blind was moved down the front of the cab making the central window smaller. 

 

These are usually smooth and powerful performers as long as the wheels are clean. 

 

The prototypes were yellow diamond coupling code meaning that they could only be coupled in multiple with a few early types. According to the BR fllet survey first Generation DMU book by Brian Haresnape. 29 sets went to East Anglia and 7 sets went to the Bury to Bacup route. I believe the number on the Tri-ang unit was one of the Bury sets. The centre coach was used by the similar 101 and 111 units, the 101 being 2, 3 or 4 car units and the 111 being 2 or 3.