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Compression Test Injector Adapter for 1.6 Mk2 Engine???
by
ftm1776
on 20 May, 2014 23:15
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Does someone make an Injector Type Adapter for compression testing the VW 1.6 non-turbo diesel engine?
My car is a 1991 MK2 with the 1.6 engine. I'm the original owner.
Otherwise, the glow plug type adapter would require the removal of the injection pump.....I think.
What size is the injector thread on this engine???
Comments please.
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#1
by
vanbcguy
on 21 May, 2014 02:03
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Yes - the cheap Harbor Freight compression tester has a fitting that will work with these engines via the injector hole. I don't know the actual size but it's the same as Mercedes and the 6.2/6.5L GM diesels.
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#2
by
ftm1776
on 21 May, 2014 14:21
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OK. I see the tester....#93644 is the one I'm looking at.....about $30.
I noticed that the one shown on the HF webpage has "12 pieces" and the one shown on the attached PDF of the 93644 Owner Manual has about 19 pieces. I'll have to check this out at Harbor Freight. Model specs seem to have changed. Just wondering if it still fits my mechanical diesel?
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#3
by
vanbcguy
on 21 May, 2014 15:58
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Most likely. The GMC 6.2/6.5L engines are so insanely common in North America it'd be suicide not to support them.
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#4
by
sgnimj96
on 21 May, 2014 20:23
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The injector adapter in the center of the HF pic is the one for vw/mercedes idi. Hansautoparts sells the exact same gauge and adaptor.
Pressure relief valve on the gauge barely works on mine , had to press it a bunch of times- may have got a bad one... but it got the job done
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#5
by
Mark(The Miser)UK
on 21 May, 2014 21:46
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The injector adapter in the center of the HF pic is the one for vw/mercedes idi. Hansautoparts sells the exact same gauge and adaptor.
Pressure relief valve on the gauge barely works on mine , had to press it a bunch of times- may have got a bad one... but it got the job done
That's the wrong adaptor, or if deemed correct, will give bad results... 
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#6
by
sgnimj96
on 21 May, 2014 22:07
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#7
by
TylerDurden
on 21 May, 2014 22:21
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That's the correct one, but shown above without proper pieces...
pic below shows req'd sleeve and washer
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#8
by
sgnimj96
on 21 May, 2014 22:42
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Wow, didn't know I needed the extra stuff. I guess it sealed with just the threads, hope I didn't scratch up anything in the prechamber. HF tester doesn't really have instructions. Thanks!
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#9
by
ORCoaster
on 22 May, 2014 00:18
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HF adapter does need collar around the part that actually threads into the engine. In addition to that collar I put the copper washer betwee the collar and the adapter body. So I have the heatshield to the collar and then the washer and then the adapter. HF kit I have has a bunch of ways you can get the flow from the adapter to the quick connect. I like to keep the compression from having to build in the hose so I try to keep the part with the valve in it as close to the adapter as possible. Like in the picture. But there are 90 degree take offs and longer parts if you need em. My Kit is the 93644 one, plenty of pieces in the red box. The compression release works fine so perhaps yours needs more use or a bit of silicone spray.
Not using the collar probably only cut a few lbs off the reading on the gauge. Without the volume taken up by the metal the compressed air would have filled that volume instead. But I doubt you would see it.
I like that kit and if it is off a few lbs in measurement so what. You are measuring all the different cylinders with the same equipment and comparing the values to one another any hoo.
Just my contribution to the cause or confusion.
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#10
by
Mark(The Miser)UK
on 22 May, 2014 05:31
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HF adapter does need collar around the part that actually threads into the engine. In addition to that collar I put the copper washer betwee the collar and the adapter body. So I have the heatshield to the collar and then the washer and then the adapter. HF kit I have has a bunch of ways you can get the flow from the adapter to the quick connect. I like to keep the compression from having to build in the hose so I try to keep the part with the valve in it as close to the adapter as possible. Like in the picture. But there are 90 degree take offs and longer parts if you need em. My Kit is the 93644 one, plenty of pieces in the red box. The compression release works fine so perhaps yours needs more use or a bit of silicone spray.
Not using the collar probably only cut a few lbs off the reading on the gauge. Without the volume taken up by the metal the compressed air would have filled that volume instead. But I doubt you would see it.
I like that kit and if it is off a few lbs in measurement so what. You are measuring all the different cylinders with the same equipment and comparing the values to one another any hoo.
Just my contribution to the cause or confusion.
Ah the universal adaptor pieces were not on display, to make it universal 
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At a guess I'd say that coller if missing would account for upwards of 1 cc.
As it's below the one way valve, it would fill up and discharge as part of the engine chamber every stroke. Further guessing, I'd say that that was approaching +15% of the compression chamber, or nearing 75psi on a good day...
Not crucial if you are just comparing cylinders, but might wrongly influence someone to embark on a $2000 rebuild if they believed the score.
Interestingly I use a standard injector bottom with nozzle holder and needle but leave out the needle thrust plate, and pack adaptor gaps with lead:o
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#11
by
92EcoDiesel Jetta
on 22 May, 2014 09:31
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....
Interestingly I use a standard injector bottom with nozzle holder and needle but leave out the needle thrust plate, and pack adaptor gaps with lead:o[/color]
Where is your Schraeder valve and how did you install it? What gaps were packed with lead? I was thinking of using an old injector body/nozzle to make a compression adapter but have not actually started on it yet.
Btw, if you look into the tip of the HF injector adapter, it has a cavity leading up to the Schraeder valve. That cavity's volume is much greater than the volume of the adapter ring/copper washer.
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#12
by
8v-of-fury!
on 22 May, 2014 11:28
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Go to prothe, buy his guage and adapter for like $20. Done deal.
I've had mine since 2008, works perfectly, and tests out against snap-on units too. A machined piece of metal, a hose and a gauge are not things that can be screwed up anymore... no matter what country they were manufactured in.
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#13
by
92EcoDiesel Jetta
on 22 May, 2014 12:07
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Go to prothe, buy his guage and adapter for like $20. Done deal.
I've had mine since 2008, works perfectly, and tests out against snap-on units too. A machined piece of metal, a hose and a gauge are not things that can be screwed up anymore... no matter what country they were manufactured in.
Is the Prothe adapter a solid hunk of steel with the Schrader at the tip? If so I am buying one.
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#14
by
TylerDurden
on 22 May, 2014 12:47
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I don't think a schrader is up to the task... 500psi? The HF fitting is a high pressure coupler that connects to the hose with a locking collar.
