Sr20 boost leak test questions - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

ImThatGuy · 12-06-2017, 09:31 AM

I have the leak tester setup for gauge and air inlet on the same fitting so it can be put on the intake and pressurized.

Is there anywhere that should "leak" normally like crankcase breather T fitting or anything I need to know about prior to testing? I have soapy water ready and will be pressurizing to 25 psi.

Thanks

*TheRealSy90* · 12-06-2017, 12:12 PM

If you've got air coming out of the crank case then you've probably got blown rings or valve stem seals.

ImThatGuy · 12-06-2017, 12:14 PM

Well its not necessarily the crankcase, but the crankcase breather T fitting. Read it could be the pcv is bad.

*TheRealSy90* · 12-06-2017, 12:36 PM

Correct, the PCV valve should be closing when you pressurize the system. If it's open it would let air through to the valve cover. It should be a one way valve, only drawing air into the intake manifold when out of boost.

ImThatGuy · 12-06-2017, 12:47 PM

Ok, perfect. This should confirm my pcv is bad and needs to be replaced. I will block it off for further testing and see if anything else is leaking.

Last time I had to do a boost leak test was so many years ago so I am trying to get a refresher on what is "normal"

Thanks for the info!

12-06-2017, 09:31 AM	#1
ImThatGuy Leaky Injector Join Date: Nov 2017 Location: illinois Posts: 60 Trader Rating: (0) Feedback Score: 0 reviews	Sr20 boost leak test questions I have the leak tester setup for gauge and air inlet on the same fitting so it can be put on the intake and pressurized. Is there anywhere that should "leak" normally like crankcase breather T fitting or anything I need to know about prior to testing? I have soapy water ready and will be pressurizing to 25 psi. Thanks

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12-06-2017, 12:14 PM	#3
ImThatGuy Leaky Injector Join Date: Nov 2017 Location: illinois Posts: 60 Trader Rating: (0) Feedback Score: 0 reviews	Well its not necessarily the crankcase, but the crankcase breather T fitting. Read it could be the pcv is bad.

12-06-2017, 12:47 PM	#5
ImThatGuy Leaky Injector Join Date: Nov 2017 Location: illinois Posts: 60 Trader Rating: (0) Feedback Score: 0 reviews	Ok, perfect. This should confirm my pcv is bad and needs to be replaced. I will block it off for further testing and see if anything else is leaking. Last time I had to do a boost leak test was so many years ago so I am trying to get a refresher on what is "normal" Thanks for the info!