Diesel Fuel Injector Balance Pressure Tester - Yes, You Can Do It Yourself!

New in 2018 - Improved design with more precise components - with a complete step-by-step written instruction manual

For all MBZ diesel engines 1950 to 1993. These are built at the Mercedessource shop to control quality and production demands. Each one is tested here in our shop before shipping. This bench-mount pop tester will allow you to economically test the spray pattern and fine tune (balance) your fuel injectors at home. With the injector fitting included it will work on all Mercedes diesel engines from the early 1950s up to 1993. This includes chassis 110, 115, 116, 123, 126, 201 and 124 and models 200D 220D 240D 300D 300CD 300TD 190D 300SD 300SDL 350SD.

Diesel Fuel Injector Balance Pressure Tester - Yes, You Can Do It Yourself!

Product Details

Must watch Instructional video: Injector tester service, maintenance and repair

This tester is required for proper IDI (indirect injection) diesel fuel injector testing and overhaul. It will work on any mechanical Bosch type fuel injector with adjustable pressure release function - although you may have to come up with your own adapter to attach the injector to the pop tester. (manufactured up to the mid-1990s). The metric thread size on this tester to connect to the top of the fuel injector is M12 x 1,5.  Assembled with special FLUTTER GUARD pressure gauge to stabilize needle bounce. This will allow for more accurate pressure release readings during testing.

If you don't think tuning and balancing your injectors is important to think again. Dirty or worn injectors can cause poor spray patterns leading to loss of power, poor fuel economy and excess exhaust smoke. Unbalanced injectors (meaning release pressures are not set within 50 psi of each other) can lead to rough idle, poor acceleration, and excessive injector knock. Worn out injector tips can lead to all of the above plus lots of $$ going out your exhaust pipe. With diesel fuel at $3.00+ a gallon, you could pay for this tester in a couple months!

IMPORTANT NOTE: Contrary to popular belief this is an important service procedure you can do at home. You will actually be surprised at how simple it is with the right tools. Even though it is not difficult, it can be time-consuming to get the pressures of all your injectors balanced just right and that is one of the reasons diesel shops charge so much money to do it. Here is a quick summary of the procedure:

The testing procedure is quite simple:

  • Bolt the tester to your workbench
  • Fill the tester reservoir with diesel fuel
  • Use face respirator - test outside or below exhaust fan at window to vent fumes
  • Attach a fuel injector to the hard line fitting included
  • Bleed the air out at the injector fitting
  • Pump the handle a few times up to the point the injector fires (pops)
  • Note the consistency of the spray pattern
  • Read the release pressure in PSI
  • Hold pressure with handle just before release point and check for injector leaks
  • Disassemble the injector to inspect / clean (search injector cleaning kit)
  • Select thicker or thinner shim washer to change pressure (search shim washer)
  • Measure shims with dial caliper to confirm correct size (search dial caliper)
  • Clean, oil, and reassemble injector to proper torque (search torque wrench)
  • Repeat test and re-adjust pressure if needed
  • Replace with new Monark nozzles if yours fail the test (search injector nozzles)
  • Install back into your engine using new crush washers and injector return hose (search injector service kits)

ADDED BONUS: As an added bonus Kent Bergsma's complete guide to cleaning, testing and adjusting fuel injectors will be included at no additional cost. This guide will walk you through the procedures step-by-step in plain English. This is an additional $19.95 savings.

Need more info? If you want to learn more about testing and adjusting procedures before you decide to purchase a tester just order the Diesel Injector manual below.

SPECIAL INJECTOR SERVICE TOOL KITS AVAILABLE: If you don't have the tools handy to work on your injectors we have put together a couple affordable toolkits. Basic requirements include the proper injector socket, a torque wrench, and a dial caliper to measure the shim washer thickness (all listed below).You will be hard-pressed to find better quality for the price we offer. Our markup on these tools is set very low just to help you get started working on your own fuel injectors. 

ALSO NEEDED: If you are going to properly change your injector pressure release settings you will also need a variety of shims. We carry shim kits on this site as well. 

MONEY SAVING COMPLETE INJECTOR REBUILD KITS ALSO AVAILABLE: If you are ready to rebuild your injectors and want to install our high-performance Monark nozzles we offer complete DIY kits that include the pressure tester, new nozzles for your engine, and adjusting shims. These are available with special pricing. 

If you own an older gasoline Mercedes you can use this basic tester to test your CIS fuel Injectors. BUT ...... you will need a conversion kit with a smaller gauge. See products below for the Diesel to Gasoline Tester Conversion kit

SAFETY RECOMMENDATION: For your own health always use a quality organic vapor / paint respirator with current filters when using this tester. See related products below for Kent's favorite. 

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