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Your cart is empty.OTC Ford Diesel Engine Compression Test Adapter is designed for use with OTC's No. 5021 diesel engine compression gauge. This adapter is used to connect the No. 5021 gauge to a glow plug port (after the glow plug has been removed) for performing a compression test. Fits 1994-2003 Ford pickups and vans with 7.3L direct-injected turbocharged (DIT) diesel engines. Similar to Ford 303-D103. High-grade materials ensure quality performance over the lifetime of the tool. Value is at the core of the OTC tool and equipment portfolio. For a simple repair or the most complex drivability concern, these award-winning tools universally solve problems faster, and at better value, than any other product line available. Whether it’s a specialty tool or unique piece of service equipment, OTC provides top solutions to modern automotive service challenges while increasing technicians’ productivity and shop profits.
chuck g.
Reviewed in the United States on February 21, 2025
Would of been perfect but where the hose fits on the end for tester was not the same fitting and not able to find anything that would fit it
tyler wombles
Reviewed in the United States on July 17, 2024
Screws into glow plug hole easy to use other testers have no room and don't work. Not sure if it works with other gauges I bought the same brand gauge
Eddie
Reviewed in the United States on October 25, 2024
If you can't blow through it take a drill bit smaller than the pipe part drill in as far as possible then using cline pliers and a piece of rebar tie wire force it through the center hole now the one I bought works fine but it took a minute to get it to work and I found out I lost a whole bank of cylinders on my 7.4l Ford they really need more quality control in my book
john
Reviewed in the United States on April 7, 2024
Worked perfect for me, seems well made just like most OTC products. I wish it was a little cheaper but o well
anton pepkolaj
Reviewed in the United States on December 11, 2021
Sealed perfectly, coincidentally the ford glow plugs are the same as on my cdi so I did the test and no leaks, you dont have to tighten too much, or else you’ll break the line!This will work on ( om648,om647, om646, om642, t1n or bluetec sprinters! )
Customer
Reviewed in the United States on January 30, 2021
This is THE adaptor for 7.3 diesels. Most others on the market will exhibit clearance issues. I did have to make an adapter to use my gauge as there is no check valve in the adaptor.
Monkeyquint
Reviewed in the United States on September 5, 2018
...the o-ring comes off. I tried making my own adapter with all the instructions on the web and wasted two days. I ordered this out of sheer frustration and it works incredibly well for the most part. I read the prior reviews about the o-ring and was really careful to pull the tool straight out slowly. Until I got to the last cylinder, #7, and lost the o-ring when I pulled it out.It’s not required for making a good seal, as I retested an easy cylinder by threading it in only finger tight and the results were the same. It’s needed to provide a slight buffer for taking the tool out once the force of the cylinder compression has been exerted in it. The brazed connections are very delicate and even the insertion was finger tight, the extraction afterwards without the o-ring providing cushion was tenuous. I was worried one of the joints would give.The tool size and dimension is absolutely perfect for the 7.3 psd test. I might try experimenting with losing the little o-ring and trying a larger one placed above the threads.
Rich Stiner
Reviewed in the United States on July 12, 2016
For performance - 5 stars. For lack of info on the fitting to the gauge, I knocked it down to 4. I still don't know what that fitting is, but I had to buy a $150 OTC 5021 gauge to work with that fitting. This price of the two tools combined is still cheaper than buying a "real" universal compression gauge kit, or paying for a compression test on the 7.3L - plus you can always sell it on a diesel forum or on craigslist to get most of your money back. These are coveted by those who need them, and they will gladly pay reasonable money for a used one.This was so easy to use, it's almost a crime. Once the glow plug is out, this spins in by hand - no fighting the infamous rocker arm issues on the 7.3L from 1994.5 to 2003. With the O-ring seal, I just tightened by hand and no need for a wrench to get a good seal for a consistent reading. I have tried many other cheaper experiments with compression tests, and none of them gave me consistent readings from one test to the next - not even on the same cylinder. This tool enables the user to get reliable readings for a reasonable cost.[...]
Paul Bland
Reviewed in Canada on June 2, 2015
Perfect. Good shipping, great tool. Perfect deal
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