I could do another one but last time the numbers weren’t really off enough to tell me much. I know it’s not rings because every time I reinstall the injectors, the blowby stops for a day or two.
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Injector blowby LB7
- Thread starter Jdherron
- Start date
I could do another one but last time the numbers weren’t really off enough to tell me much. I know it’s not rings because every time I reinstall the injectors, the blowby stops for a day or two.
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Ohhh good idea. I can get the adapter from the compression tester and hook a compressor to it
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Okay, another update: my blowby isn’t from the injectors. We tore it down, replaced the return lines, never touched the injectors, and the blowby completely stopped. However, it’s been two days and my crankcase is already full of diesel again and blowing by again. I’m thinking maybe it’s the high pressure lines leaking? I’m praying it’s not a cracked injector.
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I’m gonna get dye and try that, in the meantime I pulled a vacuum on both my fuel rails and they held a perfect vacuum so I think I can rule out hp lines. I’m at a total loss. Can I tell if an injector is cracked using efi live?
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I didn’t have time to pull my valve covers tonight but I drained the oil and refilled it, as well as checking my balance rates and pulse width. I figured out the blowby was a result of an overfull crankcase, it went away after I changed the oil. Here are the results of my balance and pulse tests, everything looks good but let me know if you see anything
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Those numbers look pretty good.
If you don't see anything from the injectors when you pull the covers, maybe the shaft seal on the CP3
Did you vacuum test the returns on each bank of injectors?
If you don't see anything from the injectors when you pull the covers, maybe the shaft seal on the CP3
Did you vacuum test the returns on each bank of injectors?
I'm still confused. You seem to be doing everything against what people tell you to do for testing.
If the crankcase is filling up you have a leak somewhere. Realistically it'll come from cracked injector bodies, sticking injectors bleeding off after shut down, leaking high pressure line, leaking return line, or leaking CP3 shaft seal.
You need to find the source of your fuel leak, that's critical. Until then you're just wasting time.
I'm not trying to be hard or harsh, I'm trying to save you from building a motor by constantly letting it fill up with fuel over and over again.
If the crankcase is filling up you have a leak somewhere. Realistically it'll come from cracked injector bodies, sticking injectors bleeding off after shut down, leaking high pressure line, leaking return line, or leaking CP3 shaft seal.
You need to find the source of your fuel leak, that's critical. Until then you're just wasting time.
I'm not trying to be hard or harsh, I'm trying to save you from building a motor by constantly letting it fill up with fuel over and over again.