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Test Equipment

Merlin Diesel's product range includes injector and pump test and service equipment for automotive, light and heavy commercial, plant, industrial, rail and marine also a selection of accessories from cam-boxes, pump mounting brackets, mobile calibrating rigs, ultra-sonic tanks to test injectors, test pipes and tool kits.

In addition to the standard range of equipment Merlin offer a bespoke service particularly useful for our O.E.M and heavy-duty customers. As well as manufacturing new equipment, Merlin always has a comprehensive selection of used equipment which can either be bought as seen or as a refurbished unit carrying six months warranty.

Grid List

Set Descending Direction

49-60 of 855

Grid List

Set Descending Direction

49-60 of 855


A surcharge is like a deposit or refund.

You can send in your old un-wanted injector or pump and we will refund you the surcharge amount you pay at checkout.

When we have inspected your old unit to meet our condition requirements, we will credit you directly into the account of your choice. Please enter your bank account number and sort code on the 'Old Unit Return' form.

Please print and adhere to our ‘Old Unit Return Procedure’ here.

Please re-use the packaging we send out your purchase in, to return the old unit.

If you do not wish to return the old unit the surcharge will become invalid from the date on ‘Old Unit Returns Procedure’


Most modern diesel injectors will need an ECU Correction Code (IMA, C2i-C3i, QR).

When replacing a Diesel Common Rail injector, it is necessary to register the Correction Code, located on the upper part of the injector, into the vehicles ECU.

The Correction Code is used to compensate injector production tolerances, this ensures the ECU balances the injector output to optimise performance and efficiency.