Does anyone know what type of quick coupler is on the Harbor Fright diesel compression tester and where I can buy one? I've never seen one like it and hope it's not proprietary. I need one to make an adapter for a VW TDI.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

showing us a picture with their respective 'types' might make this easier.

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Looks like this one except my kit is more compreshensive with more fittings.

http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=93644

The part I'm looking for is the brass quick coupler at the end of the hose on the gauge.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

right.

I don't know the names of the different style quick connectors. There are many variations of the single flange connection.

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Yes, there are probably hundreds if not more styles of quick couplers. I have a few made for hydraulics in my collection but this type is different than anything I've seen. There's a center metal plunger in the female coupler that get's pushed in as the male is pushed in. I'm sure there are o-rings in there also (not visible).

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

You could always make your own out of an old glow plug. Cut the glow end off and pull the insides out. mig a fitting onto the end of it. I have seen one made like that. If ever I can get a pic , I will put it up.

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Grumpy Old Diesel Owners Club group

I no longer question authority, I annoy authority. More effect, less effort....

1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving

I own this kit and I can take a closer look at it when I get home.

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-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250

Find a hydraulic / pneumatic hose shop close to you, and walk in with 20 minutes to spare, and the pieces you need to connect.

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CC: NSA

All things are burning, know this and be released.

82 Benz 240 D, Kuan Yin
12 Ford Escape 4wd

You're four times

It's hard to

more likely to

concentrate on

have an accident

two things

when you're on

at the same time.

a cell phone.

www.kiva.org It's not like there's anything wrong with feeling good, is there?

and the quick disconnect fittings were changed from the early style to a later one-they are not interchangeable. They appear to be custom-made for this kit, I doubt either one is an industry standard.

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Nate Stanley
(Currently Benzless)
1985 F-250 6.9l 170K
2009 SCION XB 36.5K
2003 LS430 78K
2012 Kubota B 2320

I am not understanding exacly.

The male ends of the Couplings can be unscrewd from the adapter and used on any adapter that has the same threads.
You could simply unscrew one from the Mercedes Adapter and thread it into the VW TDI Adapter. When you are done put it back on the Mercedes Adapter.

Also you might take it down to NAPA and show it to them and see if they can match it.

Also in my kit there is 2 Glow Plug Adapters. One shorter than the other. You could use that Adapter Threaded into the TDI Adapter.

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84 300D, 82 Volvo 244Gl Diesel

I have the larger HF kit and w/ the supplied 90*, i can do all 5 holes on a 617.

as for the original poster, I recommend checking all the adapters in the HF kit- seems one may work on a tdi??? or go to a vw forum for help?

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1984 123.193 372,xxx miles, room for Seven.

1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven.

One of the Pics has the Number on the label of the Box.
I used the Hose for something and did not put it back. The has has the coupling and a 90 degree bend on it; you can tell from the imprint in the box.

Attached Thumbnails

   

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84 300D, 82 Volvo 244Gl Diesel

injectors are not magic. but before you remove them, have new heat shields ready to put back in, they are not reusable. also, when you are ready to pull the injectors, have the wrench on and position the handle so you can POP it with your hand, or a hammer, DO NOT PUSH ON THE WRENCH WITH STEADY PRESSURE!@!!!!! you will pop the Prechamber rings out and that is a world of pain to fix!@

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Your kit must be different than mine. The adapter that fits the TDI glow plug hole terminates directly to the quick coupler, not to another threaded adapter.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

Do the Item Number of mine match Yours?

At the time I bought mine they were selling 2 kits. Mine is the less expensive one but does not have as many adapters as the more expensive one.

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84 300D, 82 Volvo 244Gl Diesel