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General E46 Forum
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Old 06-03-2016, 12:11 PM   #1
jayla
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How to make a cheap pressure tool to test coolant leak

Things you will need are,


1. Pump with gauge and needle as shown in pictures


2. Bleeder screw and drill and small bit to make hole and that's it.





Make hole in bleeder screw as shown below with drill, so the silver needle which came with pump can fit.


Make sure you make the hole tight enough for the needle to fit and then place needle into bleeder screw. If hole to big add silicone but I did not need to do this.







With engine cold and coolant to right level. screw the bleeder hole as shown below





now connect the pump and pump it to 1.5 bar and it can drop by 10% within 2 minutes for tolerance. You will notice all the pipes getting stiff.





Now look for the leaks





Do this DIY at your own risk as I don't know nothing about cars but I know this worked for me, to find my leak. Took me 1 minute to make. Pump shown below








Hope this helps someone.





When I pumped to 1.5bar. I noticed the new hella expansion tank joint opened up at bottom joint. So I replaced with bmw one. I did not bother pressure testing again. I wasted 1 week looking for leak and then made this tool and found it in 20mins. The leaks was only there when I moved the tank joint.
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Old 06-03-2016, 12:17 PM   #2
Yewzer B Lewzer
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Well done. Thanks.
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Old 06-03-2016, 12:43 PM   #3
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Flipping Awesome!
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Old 06-03-2016, 04:00 PM   #4
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Old 06-03-2016, 10:07 PM   #5
iowna330xi
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I dont want to be "that guy" but wouldn't that introduce air into the cooling system as you pressurize it? I am definitely going to try this next time I replace a cooling hose!
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Old 06-03-2016, 10:13 PM   #6
AndreBXP
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Originally Posted by iowna330xi View Post
I dont want to be "that guy" but wouldn't that introduce air into the cooling system as you pressurize it? I am definitely going to try this next time I replace a cooling hose!
When you replace whatever is leaking you'll need to bleed it anyway.
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Old 06-04-2016, 08:26 AM   #7
jayla
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you do know the professional tool will also put air into the system and also this is to find the leak or test system. You do need to bleed it again as mentioned above.
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Old 06-04-2016, 09:09 AM   #8
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Nicely done Jayla. Thanks very much. Glad you found your leak too.
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Old 06-04-2016, 09:43 AM   #9
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Might consider drilling a slightly smaller hole in the bleeder screw, the heat the needle up and melt it into the screw for a better fit/seal.
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Old 06-04-2016, 01:30 PM   #10
jmo69
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Nice job, but if you're concerned about air getting into the system it wouldn't be that hard to make a vessel you could fill with coolant and then pressurize that. I've got an extra et cap I could adapt it to my brake bleeder or just make something out of some PVC and some tubing.
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Old 06-04-2016, 02:25 PM   #11
BaliDawg
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Quote:
Originally Posted by jfoj View Post
Might consider drilling a slightly smaller hole in the bleeder screw, the heat the needle up and melt it into the screw for a better fit/seal.
Or, put epoxy in the hole for a good permanent seal.
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