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I have been searching for information on pressure testing to enable me to make a DIY pressure test kit.

I made one for my ur and it works fine.

However is there a definitive list for what does and doesn't need blocking off with the RS4.

My plan was to pressurise the system by removing the flexible pipe that joins the MAF to the Y tube, block the exhaust and open the oil filler cap so as not to create oil leaks..

Can anybody add to this or point me in the direction of a "been there done that" list...

Many thanks,

Darren.

I think there's a link to a guide in the 'How To's at the top of the S4(B5) forum.

i got one off the bay last year. all you need to do is disconnect the pcv valve on the y pipe and block it off. crack the oil filler cap and make a fitting which goes in place of the accordian and has a airline connection and pressure gauge on it . noneed to block off the exhaust. il dig out a photo later

jimbo1234567 wrote:i got one off the bay last year. all you need to do is disconnect the pcv valve on the y pipe and block it off. crack the oil filler cap and make a fitting which goes in place of the accordian and has a airline connection and pressure gauge on it . noneed to block off the exhaust. il dig out a photo later

Thanks for the info pics would be great.

Thanks - Darren.

here's a guide w/ parts list from AWE Tuning
http://www.awe-tuning.com/media/pdf/27t ... tester.pdf

here you go

the little thing on the right is the pcv valve take off on the y pipe blank. when pressure testing you should go to 10 psi max as the intake pipes aren reall designed to withstand pressure. a little suction pump to check the dv diaphrams arent split is a good idea too

Thanks for your help and for providing the link and pictures.

As you say a simple piece of kit to make. I'm surprised that you only test up to the throttle body, i would have thought that the numerous small pipes to the rear of the inlet manifold could be prone to leaks?

How does this test pressurise the crankcase? without the exhaust plugged it will pass over any open valves and out to atmosphere.

I guess to test all the small pipes it would simply mean blocking the exhaust and pressurising the complete engine which is how i do my ur.

Thanks again for your help and sorry for all the questions.

Regards,

Darren.

Thats the one I've got! Excellent tool!

the inlet and ex valves have an over lap which stops the pressure going straight through. the crankcase gets a small amount of air in past the piston rings. you release the filler cap so it doesnt get pressureised. if it did it would blow a seal

jimbo1234567 wrote:the inlet and ex valves have an over lap which stops the pressure going straight through. the crankcase gets a small amount of air in past the piston rings. you release the filler cap so it doesnt get pressureised. if it did it would blow a seal

I understand fully about overlap and the fact that it is small on a turbo charged engine to prevent wastage of boost.

But to have this at the same time on all cylinders would be impossible without the removal of all cams to ensure all the valves are closed.