Rebuild of a 1977 Dorman 4LDT engine

 

Engine profile:

Engine originally built from 1971 – 1993

This model originally built in 1977

Available in both naturally aspirated and normal versions, sold all over the world

Largest application excavator – Ruston Bucyrus

First engine sold to Ruston Diesels – Canada

 

The rebuild:

Purchased by Lincoln Diesels some years ago, this old Dorman 4LD had been kept in storage until this year when a customer in Israel placed an order for a Dorman 4LDT – a variation of the same engine. The time had come for the engineers at Lincoln Diesels to rebuild it from the ground up. The application for the engine was to be used in a drag line excavator, and as such, required converting from a normally aspirated engine into a turbocharged engine known as the 4LDT. Malcolm Meadwell was the Lincoln Diesels engineer in charge of the project, putting his 45 years of experience to task.

Firstly, the engine was stripped of all components, which were inspected thoroughly (see below). Starting with a cleaned engine block, the main bearing journals were inspected and measured, and the crankshaft was measured and polished before being fitted using new bearings and thrusts. New cylinder liners were also fitted, and the camshaft inspected and fitted with new bearings.

The pistons and piston rings were replaced with new parts, built onto the connecting rods (again, after inspection) and then fitted with new connecting rod bearings and bolts to the crankshaft.

The cylinder head was fully reconditioned and tested, then fitted to the engine. Up to this point, before adding the ancillaries, our engine was back to ‘stock’ status.

The final stage of the rebuild was to add ancillaries, including a new turbocharger and manifolds, an overhauled water pump, fuel injection pump, lift pump and injectors. New filters were also fitted.

All of this work took place over the course of about ten days. On completion, Malcolm was like a proud father!

 

Gallery:

Before the work was carried out…

 

Dorman 4LDT diesel engine rebuild
Dorman 4LDT diesel engine rebuild
Dorman 4LDT diesel engine rebuild
Dorman 4LDT diesel engine rebuild
Dorman 4LDT diesel engine rebuild
Dorman 4LDT diesel engine rebuild

After the work was carried out…

 

Rebuilt Dorman 4LDT diesel engine
Dorman 4LDT diesel engine rebuild
Dorman 4LDT diesel engine servicing
Reconditioned Dorman 4LDT diesel engine
Dorman 4LDT diesel engine rebuild
Servicing a Dorman 4LDT diesel engine

To find out more about the reconditioning / service work that Lincoln Diesels could carry out for your engine, please get in touch with Rob Norris, our workshop service manager. 

Phone: +44 (0)1522 781718
Mobile (out of hours): +44 (0)7798 898160
Email: [email protected]
Skype: robnorrisLD

Or you could take a look at our Service page on the Lincoln Diesels website, here.