Please explain pressure testing

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Model T Ford Forum: Forum 2015: Please explain pressure testing
Top of pagePrevious messageNext messageBottom of page Link to this message  By Michael Garrison - Rice Minnesota on Monday, August 31, 2015 - 01:58 pm:

Could someone please show or explain to me the procedure used to pressure test an engine. I have some ideas and still some concerns I might do more damage than good.


Top of pagePrevious messageNext messageBottom of page Link to this message  By paul iverson freeport ill. on Monday, August 31, 2015 - 02:02 pm:

do you mean the cooling system?


Top of pagePrevious messageNext messageBottom of page Link to this message  By Michael Garrison - Rice Minnesota on Monday, August 31, 2015 - 02:10 pm:

Yes! The head and block as an assembly. I'm not concerned with the radiator. I've got a rebuilt, welded block that I want to check the integrity of the weld. I've had welded blocks in the past that held up quite well but I'm concerned with putting a lot of work into this block and then finding a problem. I suppose I could use mag particle or dye penetrant but I think a pressure test would tell me a lot.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Gary Tillstrom 30 miles N of Memphis TN on Monday, August 31, 2015 - 02:33 pm:

Make a blank off plate for the water outlet in the head and another for the water inlet. Drill the inlet plate and install a valve stem for a tubeless tire. With the head assembled to the block, pressurize to 20 PSI or so and then take a spray bottle with very soapy water. Now spray the valve chamber area and everywhere else looking for bubbles.

I have also seen but don't care for people installing a pressure gauge and monitoring but that likely works also.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Michael Garrison - Rice Minnesota on Monday, August 31, 2015 - 02:58 pm:

Thanks Gary. That pretty much described what I was considering. I wasn't sure about PSI but seeing as how I'm not attempting to turn it into a pressure vessel I think 20 PSI should be more than good enough.


Top of pagePrevious messageNext messageBottom of page Link to this message  By paul iverson freeport ill. on Monday, August 31, 2015 - 03:08 pm:

if the head is on eng. cut an old inertube and clamp to each outlet and use the air chuck to pump it up. I dont know how much pressure you can get before tube blows out but I wouldent want to put to much pressure in block anyway


Top of pagePrevious messageNext messageBottom of page Link to this message  By Dan Hatch on Monday, August 31, 2015 - 03:47 pm:

Made a plate for each of the water in and out. Drill and tap plate for a 1/4" pipe thread. Now get a 1/4" h2o regulator and connect to the in or out. On the other in or out, connect a valve with a tee and a gage. Hook the h2o regulator to a garden hose and turn on the h2o. Set pressure to 5 to 8 PSI and sit back and watch for a leak. Safer that using air pressure. NOTE: This can also be used for running an engine without a radiator. Dan


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