Anyone recognize this tester?

Selahdoor

How can I help you, or make you laugh, today?
Supporting Member
Joined
Oct 26, 2015
Posts
2,253
Reaction score
2,004
Location
Index Wa
How it's used?

What else is needed?

You must be registered for see images attach


There is no paperwork with it.
 

Macrobb

Full Access Member
Joined
Jun 12, 2016
Posts
2,380
Reaction score
1,234
Location
North Idaho
So, basically it's just an 8-position switch box with leads. Connect each lead to one glow plug, measure resistance to ground(or mV) with a multimeter, then switch through the positions and look for differences.
Different temperatures will result in different voltages(seebeck effect) and resistances. Different temperatures will be caused by differences in firing - either too early or too late, or not at all.

I've done this manually, just using the multimeter and crawling on top of the motor while it's idling. It does work.
 

Cubey

Van dweller
Joined
Oct 18, 2017
Posts
4,066
Reaction score
1,580
Location
USA
I've done this manually, just using the multimeter and crawling on top of the motor while it's idling. It does work.

The tool would be invaluable for van mounted engine then.
 

Selahdoor

How can I help you, or make you laugh, today?
Supporting Member
Joined
Oct 26, 2015
Posts
2,253
Reaction score
2,004
Location
Index Wa
True and true.

Also, there are two 'probes' on the back of the switch unit. I would assume that those were supposed to plug into whatever volt-ohmmeter that this was made for.

You'd have to figure out which was positive and which was negative, but I don't see why you couldn't thereby hook it up to any other volt-ohmmeter. There is nothing on the unit itself to indicate which is which.
 

Jason1377

Supporting Member
Supporting Member
Joined
Dec 12, 2017
Posts
975
Reaction score
386
Location
Arkansas
@Selahdoor you never cease to amaze me with the old school tools you find, I need to learn from you n others on that.
 

snicklas

6.0 and Loving It!!
Staff member
Joined
Aug 7, 2006
Posts
6,164
Reaction score
2,342
Location
Greenfield, Indiana
I believe it is measuring resistance. So, there wouldn't be a positive and negative, just need a good connection. The only time polarity come in to play is DC Voltage/Amperage, and Diode Checking.
 

Macrobb

Full Access Member
Joined
Jun 12, 2016
Posts
2,380
Reaction score
1,234
Location
North Idaho
Except.... you would need to know you have good glowplugs....

Sent from my SM-N960U using Tapatalk
Which you still should be able to see using the tool. You will see a major difference in resistance or voltage between a good one and a bad one. Usually a bad one is open circuit.

True and true.

Also, there are two 'probes' on the back of the switch unit. I would assume that those were supposed to plug into whatever volt-ohmmeter that this was made for.

You'd have to figure out which was positive and which was negative, but I don't see why you couldn't thereby hook it up to any other volt-ohmmeter. There is nothing on the unit itself to indicate which is which.
With a modern multimeter, it won't matter, voltage or current. Does it matter if you get a "-.020mV" or a ".020mV". We know it means the same thing.
Ohm reading will be a positive number either way as well.

Not really an accurate design. Rear cylinders are always going to read different...
Why, because of oil vapors? Honestly, it's been a while since I've done this, but from what I recall, the rears weren't noticeably higher than the others.
Either way, if you get a consistent value, you can always swap two injectors and see if the voltage difference moves, which is what you are really doing here - finding relative differences and then adjusting them.

I also recall always seeing a low reading after a high one based on firing order - so if, say, #3 was reading 028mV, #4 might read 017mV, with the average being close to 20.
 

Thewespaul

Supporting Member
Supporting Member
Joined
Jul 27, 2015
Posts
8,796
Reaction score
8,058
Location
Bulverde, Texas
Which you still should be able to see using the tool. You will see a major difference in resistance or voltage between a good one and a bad one. Usually a bad one is open circuit.


With a modern multimeter, it won't matter, voltage or current. Does it matter if you get a "-.020mV" or a ".020mV". We know it means the same thing.
Ohm reading will be a positive number either way as well.


Why, because of oil vapors? Honestly, it's been a while since I've done this, but from what I recall, the rears weren't noticeably higher than the others.
Either way, if you get a consistent value, you can always swap two injectors and see if the voltage difference moves, which is what you are really doing here - finding relative differences and then adjusting them.

I also recall always seeing a low reading after a high one based on firing order - so if, say, #3 was reading 028mV, #4 might read 017mV, with the average being close to 20.

Because of the intake design and exhaust manifold design. Every idi wears out the rear cylinders first, it was those that failed on Justin’s bronco and on my shop truck. If you take temp reading at the injectors, the rear will always read hotter. You’re better off diagnosing injectors with a pop tester instead of reading cylinder temps because the cylinder pressure isn’t a part of the equation.
 
Top