I am not familiar with the testing procedure and I have not seen any threads on.

I did not find any threads in the search function for it either.

Does anyone have a procedure or a link to the threads?

Thanks in advanced.

Brice.

 

I don't have a Cody, so I'm not sure how to test one. Perhaps if you could fill us in more we could help.

Or maybe Cleatus12r will see this thread.

 

Glad you chimed in Chris, I didn't want to be the first to ask, what the hell is that.

 

Yeah, I was thinking this was an attempt to stump Cody. Good luck with that, by the way!

 

The test (which needs to be renamed by the way) is used to determine and help narrow down the source of a high pressure oil leak.

By removing one or both of the high pressure oil lines from the head (or the pump if one was so inclined), a person effectively isolates the oil rails from the rest of the high pressure system. By using compressed ("shop") air and a blow gun (preferably one with a rubber tip to minimize leakage), it's possible to hear a high pressure oil leak to diagnose injector or injector o-ring problems without first removing the valve covers. By doing this, the high pressure oil pump and injection pressure regulator are isolated and NOT tested (or botching the test). Besides, it's impossible to hear a leak with the engine cranking since there's a lot of noise present. Sure, a person experiencing low injection pressure (too low to allow a start condition) could remove the valve covers and watch for oil leaks....but that involves actually removing the valve covers and cranking the engine and watching for oil at the same time.

If there happens to be a high pressure oil leak on or near the injectors large enough to cause a no-start condition, using pressurized air is a quick and easy way to find out which side AND which hole is the culprit. Just be sure to cover the tip of the air gun with a rag just in case you don't find a leaking injector/o-ring....you'll be wearing 120-ish PSI of oil spray otherwise when you remove the blow gun nozzle from the oil line fitting.

 

I see. So now that we're talking about it, why wouldn't one be inclined to remove the hoses from the pump instead of the head? Seems like much easier access with a blow gun reaching a hose than the fitting on the head.

 

Ok, so was it named the Cody test to give you credit for it, Cody? Or totally unrelated?

 

I've seen him recommend doing that before, so I'm gonna say it was named after him.

 

Thanks to Cody, I have done it several times now to find o-ring leaks, and it works very well. Do NOT forget the part bout therag, believe me. Also realize that if you have a small o-ring leak, you have to maintain that pressure for a little bit of time. You need enough time nd prseeure to drive enough of the oil out of the rail for the leak to be udible.

 

Thanks for the replays.

Cleatus12r, thanks for posting up.

I'm trying to track down a smoke issue. It was suggested that I might try the "Cody Test".

 

MY FAULT! Cody was the first to suggest it and a couple of members benefitted big-time from this simple test. Cody came up with it, I never heard of it before, and it needs a short name... so I call it the Cody test.

The Hutch mod is named after someone named Hutchinson.

If doing it through the hoses is easier, so be it... you can test more components for leaks this way.

 

Rich... acronym quick like!

 

Back in the early days of the 444 and DT 466 I worked at a International dealer. If a injector O-ring was suspected warranty demanded that you replace only the defective cyl. So we used a porta power pump and a gauge. You could reach 500 psi and I used ATF fluid because it added color.

 

Excellent. I was sitting here trying to think of a way to use something with higher pressure than air. You saved my brain some work. Thank you!

 

How about Pull And Puff? Forgetting to block the blowback would be referred to as a PAP smear.