Injector tester setup, fittings and initial testing

[martinv]

While working on another repair, I decided to test my injectors and discovered half of them were not performing well, yet the vehicle had been running fairly well. Started easy in warm weather, not great in cold weather.

Video showing my fittings setup to work with a cheap ebay tester and initial testing:

M35A2 Injector Tester Setup and Testing

M35A2 Injector Tester Setup and Testing. Fittings required, demo of working and defective injectors. UPDATE: the brass fitting that connects to the injector is all that is needed but should be replace

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[deathrowdave]

Great video , only issue I see is the 1/4 NPT brass coupling . It’s not rated for the pressure your applying to it . The small diameter is what is keeping it intact I suppose . Where is the pump from ? that’s a cool piece of equipment . I have used a port a power type pump in the past . Thanks again for the video , be safe

 

[martinv]

Great video , only issue I see is the 1/4 NPT brass coupling . It’s not rated for the pressure your applying to it . The small diameter is what is keeping it intact I suppose . Where is the pump from ? that’s a cool piece of equipment . I have used a port a power type pump in the past . Thanks again for the video , be safe

Thanks for the reply and info. I had no luck finding non-brass fittings so took the chance. I wore a full face shield for the initial testing. The tester is a very common, below $100, just search for 'diesel injector tester'. Surprisingly the main body of the tester is plastic, but it still works for now.

 

[martinv]

Part 2: New Nozzles - Install and test

M35A2 Injectors - New Nozzles - Install and test

M35A2 new injector nozzles installed and tested and adjusted.

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[Welder1]

Part 2: New Nozzles - Install and test

M35A2 Injectors - New Nozzles - Install and test

M35A2 new injector nozzles installed and tested and adjusted.

rumble.com

Those look good now it should run better with smooth idle.

 

[reset2]

Great video. Let's get an update and exhaust video of your truck with the new injectors.

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[dReed39]

Great video , only issue I see is the 1/4 NPT brass coupling . It’s not rated for the pressure your applying to it . The small diameter is what is keeping it intact I suppose . Where is the pump from ? that’s a cool piece of equipment . I have used a port a power type pump in the past . Thanks again for the video , be safe

Sounds like the brass coupling is the issue on buddy's new M35A2 project. We'll just finish installing the suspension and rockstar wheels on the truck this week before we can take a closer look at it.

 

[martinv]

Engine is up and running again.
I'm more surprised how well it ran with poorly functioning injectors than how it is running now.
It is at least as good now, but there is no obvious improvement.
This video shows the exhaust around 4:40 and it is very clean:

M35A2 Rechecking Valve Clearance - Oil flow issue (Liner Repair part 9)

Checking valve clearance for the 2nd and 3rd time since the rocker assembly was removed and reinstalled I wanted to confirm it did not affect the clearance. If it did it was only minimal. Oil flow app

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[M37M35]

Looking good!

Oil flow appeared to be lacking to 2 of the rockers, but after inspection found no reason for this, it was re-installed and after a time the oil flow did show up to those rockers. Is this common for delayed oil to some rockers?

I know the oil flow isn't as enthusiastic as you would think it should be. Mine flows about the same.
But apparently the rockers don't need much oil, because when I had my heads off, I found out that mine had had NO oil flow since the military had last overhauled the engine! There was no plug in the end of the rear rocker tube, which meant no oil flow! They had some wear but still adjusted to spec.

 

[martinv]

Looking good!

I know the oil flow isn't as enthusiastic as you would think it should be. Mine flows about the same.
But apparently the rockers don't need much oil, because when I had my heads off, I found out that mine had had NO oil flow since the military had last overhauled the engine! There was no plug in the end of the rear rocker tube, which meant no oil flow! They had some wear but still adjusted to spec.

Thanks for that info. Good to know.