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  #1  
Old 03-28-2006, 06:10 AM
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Harbor Frieght tools has diesel compression tester on sale for $16

I could not resist buying one of these yesterday. I opened and it has a release valve for the pressure on the gauge. Nice set. Don't know about how much of a quality set it is, but WOW! It was only $16 bucks this week on sale at Harbor Freight tools. Picked up mine locally so no shipping!
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  #2  
Old 03-28-2006, 08:51 AM
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What is the stock number?
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  #3  
Old 03-28-2006, 09:03 AM
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Item # 93644. Catalog also has a gasser one for $6 - Item 92697.
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  #4  
Old 03-28-2006, 09:04 AM
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Another one???? This is the third time this month.

Compression tester

Compression tester
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  #5  
Old 03-28-2006, 11:56 AM
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How do you use one of those, do you attach it to the glow-plug hole then crank the engine/look at the gauge? (cold and warm engine)?
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  #6  
Old 03-28-2006, 01:25 PM
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Depending on the engine you use either the glowplug hole or injector hole. Depending which adapter will work. My car uses the glowplug hold.

You test warm. Crank 3 or 4 times over and take reading. Without starting of course.

Danny
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  #7  
Old 03-28-2006, 08:41 PM
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$16, wow, thats cheap, I payed something like $23 just for the MB adaptor with the 90 degree swivel.
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  #8  
Old 03-28-2006, 08:44 PM
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this one is everything

The one I just bought from them comes with everything. I think mine has both the glow plug adapeter and I know it has the injector adapter. Nice set for $16.

WHen I change out my injectors soon I will take some readings.
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  #9  
Old 03-29-2006, 03:04 AM
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Quote:
Originally Posted by dannym
You test warm. Crank 3 or 4 times over and take reading. Without starting of course.

Danny

A few more questions. What is the easiest and cleanest way of keeping the engine from starting? Remove all glow plus?

As for the engine being warm... I dought I can test all five cylinders at the same warm temperature. Isn't a cold test more uniform?
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  #10  
Old 03-29-2006, 08:24 AM
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Since you are going to run a compression test on all cylinders, go ahead and remove all the glow plugs before you start. The car can not start with the glow plugs out because of lack of compression. However, you should hold the stop lever to the extent possible, because you don't want the cylinder you are testing to ignite.

This tends to make the task a two-person job if you have someone turn the key to engage the starter.

Of course, you can prevent any chance of starting by also removing the metal injector pump to injector lines.

Ken300D
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  #11  
Old 03-29-2006, 10:30 AM
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Are these testers reliable? Do they give the good unmbers?
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  #12  
Old 03-29-2006, 03:55 PM
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I just purchased this set today locally - instructions do no include a GP option for my car (1978 300D). It does list an adapter for the injector hole for all "early models" mercedes. My question - what is the thread in the glow plug holes on my engine (OM617)?

Ryan

I have the 'large' hook style GP's - I'm thinking it is 18 X 1.5mm??
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Last edited by rgnprof; 03-29-2006 at 04:03 PM.
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  #13  
Old 03-29-2006, 06:32 PM
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I think you right, 18mm...... and i believe the 'later" GPs are 12mm
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