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> Harbor Freight Leakdown tester, How does it work, or is mine just FUBAR?
VaccaRabite
post Mar 15 2008, 09:51 PM
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So I took out the new HF leak tester to play with it.

I just put on the 3/4 bank of pistons/cylinder and torqued down the head. Get N03 to TDC. Pull the tester out of the box, and the leak gauge is showing about 40% leak before I even plug it in.

OKay, so I read the instructions, as this looks like it works differently from the last tester that I used.

Directions say to hook it up to the engine. Then depresurize the regulator until the leak dial hits zero. Then it should give me a percentage loss.

Huh? There has to be somehting else I do to show the percentage loss. I have not changed the tool from setting it to zero.

Tool 1, Zach 0
Someone that has used one of these things please pipe in. What am I not doing.

Zach
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SLITS
post Mar 15 2008, 11:26 PM
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As I remember, you set it to zero before hooking it to the cylinder. If you are using 100 psi feed, you will see about 15 on the guage when it is "zeroed". Then you plug it in to the engine and it will read leakdown as a percentage.

Before you disconnect from the engine, bleed the air pressure down with the regulator on the leakdown tester. If you don't the needle will slam into the stop and beome permantely set at 45% (unpressurized) which may have already happened. After I discovered this, I bought a new one and returned the old one.

Hey, it's just numbers .... a cheap tool ..... all the engines I have tested (most not run in a long time) run between 25% to 35% leakdown. One of the days I may try it on an engine that has been run recently.
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VaccaRabite
post Mar 16 2008, 08:11 AM
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QUOTE(SLITS @ Mar 16 2008, 01:26 AM) *


Before you disconnect from the engine, bleed the air pressure down with the regulator on the leakdown tester. If you don't the needle will slam into the stop and beome permantely set at 45% (unpressurized) which may have already happened. After I discovered this, I bought a new one and returned the old one.



I think that is exactly what happened to mine. I have a feeling I got one that had been returned.

Zach
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