FAQ NOV 2020

Frequently asked questions

Welcome to our growing resource where we list typical enquiries, if you need an answer on a topic then please contact us.

Dear Dorman Diesels,
I have a Dorman 4LD engine powering a Newage 67kva Generator that has done less than 200 hours from new, and I need a new “lift pump” as the one currently installed does not work. I will use this unit to power a small “coal recovery plant” on my site.
The engine is a DORMAN 4LD – Engine Number: 04035 / 0972 / 121 – and this unit was originally installed as a back-up generator in an Aerospace Manufacturing Plant in London in the 1970’s or so I believe, and I have had it running. It runs very well, but now the “lift pump” is not providing any fuel to the twin fuel filters that are installed “in-line” before fuel is supplied to the SIMMS Fuel Injector Pump.
The lift pump currently installed does not look quite right to me, though it has the original Dorman Green Paint on its “body” and it seems to have been removed and refitted – probably many years ago.
Anyway, can you supply me with a new “lift pump” and if so then please let me know the cost and how I can pay. I would like any “parcel” to be delivered – to the address below – by Royal Mail – as I find couriers unreliable, so please include for this in your charge.
Any “hints or tips” you can give me will be most welcome.
 Could you advise oil capacity for the following please:
 Eng No 082322/0590/001
Eng No 123392/0690/003
Dear sir,
We have a milk processing factory and it was established in 1956. We have Dorman generator in our milk collecting centre. at the moment, that generator is no in working condition due to under compression state. we couldn’t find any local agent for do that repair, so we disassemble the engine and we found the piston rings, scraper rings and cylinder liners should be basically replaced. so can I know about the possibility of getting spare parts and technical and operations manual of this generator engine? details of the engine was given below. I decided to do that repair due to alternator side is in good condition. thank you.
Engine type – 6LB
Make – W.H Dorman & co. ltd, British
Serial No – 71976
Spill – 26”
Hi All,
Would you be able to provide any details or information on the attached engine please we have just taken into stock?
We believe this is a Dorman 6750 Diesel Engine complete with Clutch, 6-cylinder engine.
Hi there,
I am trying to track down a manual for a Dorman 6 Cylinder Diesel (Type – 6LB, No. 68068, Crompton Parkinson, 3 Phase 77.5 KVA).
Was hoping you may know how to get PDF of the manual?
Hello, we have a Dorman Diesel Generator at one of our telephone exchanges, undergoing repairs at the moment.
I am hoping to get access to a schematic of sorts for the pulley wheel tensioner for the fan belts, as we have none of the original documentation on site.
The pulley tensioner had broken off so we’ve had a new pulley machined, but unsure on the order for the parts to go back together.
I have attached some pictures for reference, the generator details are as follows: Dorman 12QV 170kW Generator S/N 94282.
Dear sir,
We have faced with piston breakage on our generator.
Engine type: 8SETCA2
# 082323/9524/I56
Generator: Ser. Number: C060072/02
 Please give us information about:
  • Causes of breakage
  • Spare parts offer for repair
  • Offer for repair and service
  • Other recommendations.
There are some pictures attached from broken parts.
Good morning ,
We look after a 12 and 6 PTRC engine for a customer here in New Zealand and have a couple of questions regarding each engine .
The 12PTRC engine turbos were recently sent away for overhaul only to come back as possibly corroded together and unable to be disassembled, also the turbo charger repair company noted that these turbos are obsolete and have been since approx 1998.
The number on the one of the current turbo chargers is:
Make: Holset
Do you know of an equivalent turbo that will fit this engine for continued operation?
Also regarding the 6PTC (r) engine it currently has I believe the original oil filter arrangement with cartridge type filters, is there a kit available to modify this to Spin on type oil filters?
Bit of a long shot, and probably not something you deal with.
A friend of mine has, what is believed to be the last early Pagefield lorry left in existence.
He’s looking for a Dorman 4JO engine, or parts. Even a 2JO would be a start.
Would anyone know of any, or maybe contacts I could approach?
Kindly help me out with the above engine timing please for a Dorman 12QT.
I do appreciate your response.
One of my DORMAN diesel generator sets was out of working. Could you please notify us the details gensets data like engine flywheel dimension and others?
Can you please send me a wiring diagram to this ECU for a Dorman 12STCA?
Good morning,
Hope all is well your side. Is it possible to help with a engine spec sheet for a Dorman 80TK model? Looking for fuel consumption, kw of engine and info about the gas flow exhaust.
Hi mate
Hope you blokes are well over in England….
I’m enquiring about an engine rebuild kit and workshop manual for a Dorman 4LDT.
Please reply when you have a chance.
I was wondering if you could help me out with obtaining the SAE sizing for my Dorman 12STCA R3?
I am trying to fit a new generator alternator to the engine.
Hello there,
We have been tasked by our customer to completely refurbish a fire pump that was purchased from us back in 1999.
This fire pump was fitted with a GEC Diesel ltd, 12ST engine with the serial number 12131/0682/010.
If possible, please can you provide a list of the components (both electrical and mechanical) that will need to be replaced as part of the refurbishment?
I am considering buying a restored 1962 Dorman 3LB for a new narrowboat build and wanted to know what parts availability was like for this engine please? Also if you have any comments about the suitability of this engine for a narrowboat?
I’m in Western Australia and have a marine vessel fitted with a Dorman Diesel engine. The previous owner has no information on the engine… At this stage all I can find is 6L 750 stamped on the side of the engine. Is there a Dorman supplier in Australia that I can contact for information?
Good day,
 I am operating “E range vertical diesel engine” as power supply for our milling machine. Engine number : 78ESL6B418 Works order : BE 13753.
So what happened is when we start the engine 4 days ago it worked just fine for about 2 hours and is suddenly the water pump alarm goes on and the engine shut down.. I had engineer here looking at the water pump.. And said that the water pump is working just fine.. So he said that he want the parameter sheet for this engine so he can diagnose the failure and the spare parts needed to fix it!!
I’ve been looking through the Web from morning and i found your website that specialise in this engines.. Can you supply me with the manual of parameters reading for this engine.. And do you have spare parts for it available?
Good evening and thanks for the chat on the phone about these engines,
I think the head gaskets have gone as we have water in the pots. We have removed the injectors and swung it over and yes water was expelled.
What would you recommend? Also, what’s your
approx. price to put right if it is head gaskets? Is there anything else we need to check?
Dear all,
We have an diesel engine DORMAN  type  6QT.
What is the oil capacity for drain maintenance?
Hi, I have a Dorman 5 cylinder diesel engine, Type 5LD, engine no. 97241. Telex no. 36156.
I want to know what it is worth.
It is in mint condition, with only 828 hrs on the meter.
Please advise.
Good morning.
I am currently testing a Dorman SET 12 CA2 Engine. Could you tell me how many teeth the flywheel has please?
We have and 8QT 26L engine what is the fuel burn per hour of this at 1500rpm with loads of 25% 50% 80% and 100% load?
What hp is this engine?
Hi Dorman Diesels,
We have a large engine (Dorman 6LDT) that you have manufactured and would like some info on it if that is possible?
It is in good working order and used as an emergency backup power generator, for our reheat furnace water cooled system
The only info I have on it is on the name plate, as above – I can’t find any information on the model on line – only info regarding the history of your company.
If you have a manual or any info on manufacture date, specification, parts / service info, it would be much appreciated.
At some point in the future I would like to get it serviced by a specialist if you recommend anyone local, or if your team do onsite servicing?
Good morning
We have an air cooled Dorman diesel six cylinder engine type 6DA no.  91739. This motor was originally coupled to a generator approximately 100 kv.
We wish to couple a Warman pump. Serial no.S36960. 6” inlet 4” outlet  to the motor. What hp rating is the motor? Can the injector pump be rated for greater hp if needed?
Engine no.5406/0869/15 type6APCM/3
Hello, I am hoping to get some information pertaining to the engine above.
The info I’m looking for is how much gear oil is required. Also, any information on it’s clutch would be fantastic.
I want to change the oils in a Dorman 6QTV. Could you please tell me what is the oil capacity for drain maintenance and also at what oil pressure should the engine be operating? Thank you in advance for your time.
We own a 6LDTCA II used as a power generator, but we don’t have any kind of manual for it. Do you have available in PDF file a service manual, parts manual, owner’s manual for this engine?
I have been asked to remove a generator from a basement of a building and was hoping you might be able to provide me with the drawing or weight of the engine – the id plate is for a Dorman 6SETCA(2).

Please note that names, addresses and contact information have been removed from enquiries for the purpose of confidentiality.

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