Gearcase pressure tester

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outbdnut2
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Gearcase pressure tester

Postby outbdnut2 » Mon Oct 08, 2018 11:06 am

Looking at a nice homemade pressure tester in another recent post got me to thinking. I've been going to make a tester for a long time. I have an automotive radiator/coolant system pressure tester I bought 30 years ago and haven't used for many years, and I'm thinking of adapting that for gearcase pressure. It has a hand pump, checkvalve, and a gauge and is made to go from 0 to 30 pounds.

It looks nearly identical to the photo below (from O'Reilly auto's website) - I'm thinking all I have to do is replace the radiator cap on the end of the hose with a fitting to thread into the lower gearcase drain hole. Maybe use compressed air quick-connect fittings to switch back to the radiator cap. Has anyone done that? Your thoughts?
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NJ-boatbuilder57
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Location: New Jersey

Re: Gearcase pressure tester

Postby NJ-boatbuilder57 » Mon Oct 08, 2018 11:19 am

Sure seems like it would work.

Chris_P
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Re: Gearcase pressure tester

Postby Chris_P » Mon Oct 08, 2018 11:22 am

Yes would work fine.

I made mine from a tire inflator/gauge as in the picture below. I simply cut off the end that attaches to the tire and installed one from the link below it that fits into a gearcase.

https://www.ebay.com/itm/CDI-551-34TN-T ... 1438.l2649
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RCO
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Re: Gearcase pressure tester

Postby RCO » Mon Oct 08, 2018 12:54 pm

That's what I did to make mine. I added quick connects so I could go back and forth from auto to outboard testing. I drilled a 3/8" NC stud to let the air through and threaded that into a male quick connector with a thick rubber washer to seal it to the gear case. Works great, and the 3/8 thread fits OMC, Merc, and Chrysler at least.

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Steve D
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Re: Gearcase pressure tester

Postby Steve D » Mon Oct 08, 2018 1:22 pm

outbdnut2 wrote:I have an automotive radiator/coolant system pressure tester I bought 30 years ago and haven't used for many years, and I'm thinking of adapting that for gearcase pressure.

I also converted something similar to use for gear case testing and dual hose tank pressure testing.
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pressure tank tester.jpg
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rjoynt
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Re: Gearcase pressure tester

Postby rjoynt » Mon Oct 08, 2018 4:21 pm

I called Stevens a few years ago and bought a rebuilt tester for half price. Great folks to work with. Then recently bought the vacuum version on eBay at a great price.
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outbdnut2
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Re: Gearcase pressure tester

Postby outbdnut2 » Mon Oct 08, 2018 4:35 pm

Thanks guys, I think I'll convert my radiator tester and it never occurred to me to use it to test pressure tanks.
Dave

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Bob D
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Re: Gearcase pressure tester

Postby Bob D » Mon Oct 08, 2018 10:31 pm

Steve D, what pressure do you use to check the two line tanks?
Bob D

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Steve D
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Re: Gearcase pressure tester

Postby Steve D » Mon Oct 08, 2018 10:55 pm

Bob, I think I remember someone on here saying that these tanks run on only 3-4 lbs. but I usually test at around 5-6. That's enough to detect a leak and then spray soapy water to isolate it.
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fleetwin
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Re: Gearcase pressure tester

Postby fleetwin » Tue Oct 09, 2018 6:50 am

rjoynt wrote:I called Stevens a few years ago and bought a rebuilt tester for half price. Great folks to work with. Then recently bought the vacuum version on eBay at a great price.


The folks at Stevens are very nice, they answer the phone, and return calls. A rarity these days. Stevens also sells the fittings that screw into the gearcase separately at a very reasonable price. The key to any pressure vacuum gage is a good gage that reads low enough for this work, and that doesn't have its own internal leaks....Nothing more frustrating then trying to find a gearcase leak only to discover that the leak is actually in your pressure tester rig....


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