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02-14-2024, 08:35 PM | #1 |
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Pressure Testing a Block
I’ve got a block I want to pressure test. So what is the preferred method? Apply air pressure and spray soap and look for bubbles or fill the block with water and apply how much air pressure to it??
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02-14-2024, 08:52 PM | #2 | |
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Re: Pressure Testing a Block
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You can also submerge the whole block, pressurize it and look for bubbles. I use 25 to 30 lb. pressure. |
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02-14-2024, 09:20 PM | #3 |
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Re: Pressure Testing a Block
I fill with water and use 50 psi. air pressure.
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02-14-2024, 10:47 PM | #4 |
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Re: Pressure Testing a Block
I fill with air and spray a foamy soap solution all over the thing - making dang sure to spray inside the exhaust ports (top to bottom).
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02-14-2024, 11:05 PM | #5 |
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Re: Pressure Testing a Block
I’ve got an 8BA block that has cracks in the intake and exhaust valve seat on the same cylinder. The crack in the exhaust is very short and runs up to the seat . The crack in the intake runs under the seat an over to the cylinder. I removed both seats and pinned the cracks . If it passes a pressure test I’ll install new seats and sleeve that one cylinder .
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02-15-2024, 04:50 PM | #6 |
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Re: Pressure Testing a Block
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I've found that sometimes the pins will weep just a bit - so I always start the engine and use a water-glass ceramic seal product from Moroso for the initial break in. Sometimes I do it twice just for good measure. This stuff will seal up the IronTite pins if they are weeping. Hopefully you can save the block! |
02-15-2024, 05:01 PM | #7 |
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Re: Pressure Testing a Block
I fill mine with air and have a pressure gauge on my water pump plate with an on/off valve and let it sit with 50psi of air and see IF it will hold 50 psi check it in the morning. IF its down, then re pressure the block and start with the water & soap spray bottle. IF still at 50 in the morning a shout of joy and a Fess Parker skippitdy do!!!
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02-15-2024, 07:34 PM | #8 | |
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Re: Pressure Testing a Block
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02-15-2024, 08:54 PM | #9 |
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Re: Pressure Testing a Block
I would be a bit wary with 50 lbs in a fairly thin walled cast iron block. When I blew out that 12 ply 'roller' tire at 30 lbs, the explosion was extremely violent and caused a most unfortunate permanent hearing loss that I live with today. That's way more pressure, and I would imagine schrapnel could be involved. (Never thought I'd be one of those safety guys).
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02-16-2024, 11:58 AM | #10 | |
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Re: Pressure Testing a Block
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02-15-2024, 09:15 PM | #11 | |
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Re: Pressure Testing a Block
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Last edited by Ken/Alabama; 02-15-2024 at 09:34 PM. |
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02-15-2024, 10:05 PM | #12 |
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Re: Pressure Testing a Block
I had a freshly pinned and sleeved cylinder in a new rebuild that I bought. It leaked on startup. I used Kand N block seal and the instructions said to pull the plug on the affected cylinder before the run. It seemed like a good idea as the sealing wasn't working against compression. I have wondered if it might be a good idea to pressurize the block with the K W in it to drive it deep into any potential leak zones. Just a thought. Oh, and the sealer worked very well for me.
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Owner/Operator of 'Jailbar Ranch' on the side of Mt. Pickett. Current stable consists of 1946 1/2 ton pickup turned woodie wagon with FH V8, 1946 Tonner Pickup with 226 H six, 1979 Toyota landcruiser wagon, now wearing 1947 Ford Jailbar sheet metal. 'Rusty ol' floorboards, hot on their feet' (Alan Jackson) |
02-16-2024, 12:09 AM | #13 | |
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Re: Pressure Testing a Block
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02-16-2024, 12:49 AM | #14 | |
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Re: Pressure Testing a Block
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02-16-2024, 04:39 PM | #15 |
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Re: Pressure Testing a Block
I only run the ceramic seal during the initial warm-up of the engine on the test stand - usually 15 minutes max. Then I immediately drain the water (when it is hot) and flush the engine/radiator with fresh water. If the block has a repair in it (like we're talking about), then I do this twice.
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02-15-2024, 06:36 PM | #16 |
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Re: Pressure Testing a Block
I forget the brand of pins we used to use but they were NOT IronTite.They were USA made and the instructions said to use K&W Sleeve Seal for sealer.
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02-16-2024, 02:49 PM | #17 |
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Re: Pressure Testing a Block
I think he’s talking a 100# to pressure test the block Bud.....radiator is not involved....I’d be interested in Jacks answer........Mark
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02-16-2024, 03:04 PM | #18 |
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Re: Pressure Testing a Block
All my post are "block" pressure testing only
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02-17-2024, 06:20 AM | #19 |
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Re: Pressure Testing a Block
Excellent news
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02-17-2024, 09:11 AM | #20 |
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Re: Pressure Testing a Block
That's some excellent results! Tell us about the crack repair kit. Was this the first repair of this type you have done or are you an old hand at it? And now you plan to sleeve the cylinder? Thanks and congratulations on a job well done!
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Owner/Operator of 'Jailbar Ranch' on the side of Mt. Pickett. Current stable consists of 1946 1/2 ton pickup turned woodie wagon with FH V8, 1946 Tonner Pickup with 226 H six, 1979 Toyota landcruiser wagon, now wearing 1947 Ford Jailbar sheet metal. 'Rusty ol' floorboards, hot on their feet' (Alan Jackson) |
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