Finally bought a MEP-831a

[AfghanVeteran2010]

looks like it bolts up where injector used to be, flange and all.

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[AfghanVeteran2010]

Im just going to use old injector, do i need to take out internal in the injector?

 

[DieselAddict]

I think you should. You'll need the lowest resistance path possible to get the most accurate compression reading.

 

[AfghanVeteran2010]

Do I need to a new Fuel Injector Nozzle Gasket for the test?

 

[DieselAddict]

I don't think so. You can use a little antisieze to make sure you have a good seal.

 

[AfghanVeteran2010]

This is the best I could come up with for connecting it to injector. Wonder what will happen to the connectors at pressure. Think this is a good idea or bad idea?

 

[DieselAddict]

You will be fine with that.

 

[AfghanVeteran2010]

Thanks

Going to seal threads with Teflon tape, and test. From what I've seen others do on YouTube with gas engines, that they crank engine till pressure peaks out at. Is this correct?

 

[DieselAddict]

That is correct.

 

[AfghanVeteran2010]

Cylinder compression pressure at 3000 rpm engine speed (turn the starter motor) Standard: 427psi Service Limit: 356psi. The air compressor fitting I use probably won't hold at that pressure. I was able to put something better together. As for low pressure side of injector I'll place a screw in it ill also attach a hose and bend it over.

 

[Dwnorton1]

Swagelok fitting. Nice. 316? if so your good to 8000psi on .028. What industry are you in, you don't find those parts at Lowes?

 

[AfghanVeteran2010]

Did the compression test best I could get is 150PSI. That not nearly close, I checked for leaks on fittings couldn't find any with soap and water. I did observe when I let off of the starter the pressure jumped a tad 20-60 PSI, don't know if this is normal. My brother said I should try applying pressure to cylinder, see its a valve leak. As for the fitting and tubing I got it from my dad, he work in oil field.

 

[DieselAddict]

I think the very small diameter line is restricting the flow too much.

Doing a leakdown test is a good idea.

 

[AfghanVeteran2010]

Harbor Fright has a kit the regulator maxes a 10PSI, think that will work?

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[DieselAddict]

There is an orifice in the leakdown manifold that regulates the airflow into the cylinder. Normally you use about 90psi input.

 

[AfghanVeteran2010]

Do you mean 90PSI to cylinder or the leak down tester.


Thanks

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[DieselAddict]

Not in the cylinder. You'll have 2 gauges on the tester. One is the input pressure. You'll adjust the regulator on the leakdown tester to a value indicated on its leak rate table (input gauge). The second gauge is downstream of an orifice in the manifold that limits the volume of air that passes through. The difference between the gauges lets you know if you have problems in the engine. The more leakage in the cylinder the lower the pressure on the second gauge.

 

[AfghanVeteran2010]

Is it normal for the exhaust rocker arm to move around like this(side to side)? The Intake rocker is solid as a rock(side to side movement), I have looked at engine TM and yanmar manual and could not find any remarks on this.

 

[DieselAddict]

That doesn't look right to me. Is there any odd wear pattern to suggest that its been moving out of position over the valve?

 

[Guyfang]

I have fooled with a few YANMARS, never saw anything like that. Something is not right.