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Engine Compression tester??

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Old Sep 29, 2009 | 01:50 AM
  #1  
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Engine Compression tester??

What is the difference between the two?

CAR TRUCK DIESEL ENGINE check COMPRESSION TESTER TOOL 9:eBay Motors (item 270460065685 end time Oct-22-09 11:44:45 PDT)

or..

Diesel Compression Gauge - Snap-on MT33C

I want a good one.. but I do not know what is a good price range.

Thanks alot fellas.
 
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Old Sep 29, 2009 | 05:14 AM
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i would go with the snap on unit.if it breaks, you can get it replaced/repaired at any snap on truck.

the other one is cheap china junk.
 
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Old Sep 29, 2009 | 08:57 AM
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so at what price range do the gauges start to be of good quality?
 
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Old Sep 29, 2009 | 10:02 AM
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i paid $75 for my OTC compression tester around 25 years ago.
 
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Old Sep 29, 2009 | 05:42 PM
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If it were me ,I'd do a leak down...


Leak-down tester - Wikipedia, the free encyclopedia
 
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Old Sep 29, 2009 | 06:30 PM
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Do you specifically need a diesel one?
The Snap-On one does not come with adaptors, those cost extra.
If you need one for a gas engine, I have a Matco CT110K and it's pretty nice, it replaced a Mac one that was about 20years old.
 
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Old Sep 29, 2009 | 09:02 PM
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I need one for diesels.. that's all I run haha
 
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Old Sep 30, 2009 | 02:59 PM
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In that case you DEFINITELY need a diesel gauge. The range of a gas engine gauge goes up to about 200PSI, while the range of a diesel gauge goes up to about 700PSI. Also for diesels there is a wide range of adapters for connection to various glow plug and injector holes.

I got a pretty good diesel set for about $100 about 6 or 8 years ago from one of the online tool sites.
 
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Old Sep 30, 2009 | 03:07 PM
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Thanks for all the help guys.. Both of the gauges are specifically for a diesel.. so what's the difference?

Other than the cheap one comes with fittings..

Also, how do i do a leakdown test?
 
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Old Sep 30, 2009 | 05:16 PM
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A leak down is done through the GP's as well . Set each cylinder to top dead center , plug in the tester . You will hear air ,either from the exhaust , intake ,or c case. the gauge on the tester tells you the percentage of loss . As in 80 /80 being 100% ect..It is a very accurate test , mostly used by airplane mechanics...
 
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