Wez_
CB750 Addict
Ok, well I'm really trying to do this test correctly, but I'm losing faith in this tool. Perhaps it's just my inexperience with both this tool (first time) and the measurement on an engine as opened up as mine.
Basically I can hear the air hissing past the rings into the crankcase whenever I test cylinders 1-4.
This is the most consistent factor.
This has been proven for all cylinders to have an audible hiss of air passing through the cylinder down and out through the crankcase openings. (center engine and side time cover)
The next issue is I'm trying to calculate the % leak down with the piece of Harbor Junk leak down tester.
I had to swap the provided unique Industrial fitting onto my air compressor hose in order to even plug the tool into my compressor...
The supplied fitting to the tool is Industrial fitting which doesn't mate to Mechanical...
Problem solved...but the provided % Gauge gave me INCONSISTANT % every time I disconnected and reconnected to it. I tried everything, but I could not yield consistent measurements with the tool in factory form.
The swapped fitting also leaked at higher supplied PSI. I had to set the tank pressure lower to 75 for the fitting to not leak.
Once all that was solved, I lastly replaced the supplied % gauge with a standard 160 PSI gauge and looked up some videos on how to run the tool.
Downloaded the Summit racing data sheet on their tool and they gave me a formula to use to calculate leakdown % when using different supplied air values other than 100 PSI.
Left Gauge - Right Gauge) / Left Gauge X 100 = Leakdown %
So now, Im at the point where I have a modified Harbor Junk Leakdown Test 2.0.
TDC @ 1.4, connected fitting to cylinder, to the Tool, then connect to 75 PSI air supply with no leaks.
Starting with the valve all the way counter clockwise on the tester, and both gauges at 0, I set the Left Gauge to 60 PSI...
The hissing starts coming out from past the rings and into the crankcase, and the Right Gauge reads 55 PSI...
I calculate the % leakdown and calculate 8.3% leakdown...
Is the hissing past the rings normal for 8% leakdown or does this tester need to be returned asap?
If everything is normal, and there is no need to return the tool, I would love to take the chance to learn something about this tool, this measurement and how to use it and what am I analyzing.
Im sure there are plenty of diagnosis tips and tricks to be learned. I don't want to blame the tool when it could very well be the operator...
Basically I can hear the air hissing past the rings into the crankcase whenever I test cylinders 1-4.
This is the most consistent factor.
This has been proven for all cylinders to have an audible hiss of air passing through the cylinder down and out through the crankcase openings. (center engine and side time cover)
The next issue is I'm trying to calculate the % leak down with the piece of Harbor Junk leak down tester.
I had to swap the provided unique Industrial fitting onto my air compressor hose in order to even plug the tool into my compressor...
The supplied fitting to the tool is Industrial fitting which doesn't mate to Mechanical...
Problem solved...but the provided % Gauge gave me INCONSISTANT % every time I disconnected and reconnected to it. I tried everything, but I could not yield consistent measurements with the tool in factory form.
The swapped fitting also leaked at higher supplied PSI. I had to set the tank pressure lower to 75 for the fitting to not leak.
Once all that was solved, I lastly replaced the supplied % gauge with a standard 160 PSI gauge and looked up some videos on how to run the tool.
Downloaded the Summit racing data sheet on their tool and they gave me a formula to use to calculate leakdown % when using different supplied air values other than 100 PSI.
Left Gauge - Right Gauge) / Left Gauge X 100 = Leakdown %
So now, Im at the point where I have a modified Harbor Junk Leakdown Test 2.0.
TDC @ 1.4, connected fitting to cylinder, to the Tool, then connect to 75 PSI air supply with no leaks.
Starting with the valve all the way counter clockwise on the tester, and both gauges at 0, I set the Left Gauge to 60 PSI...
The hissing starts coming out from past the rings and into the crankcase, and the Right Gauge reads 55 PSI...
I calculate the % leakdown and calculate 8.3% leakdown...
Is the hissing past the rings normal for 8% leakdown or does this tester need to be returned asap?
If everything is normal, and there is no need to return the tool, I would love to take the chance to learn something about this tool, this measurement and how to use it and what am I analyzing.
Im sure there are plenty of diagnosis tips and tricks to be learned. I don't want to blame the tool when it could very well be the operator...