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Leakdown test/tester
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Posted by: 86 Quad R

the question has been asked or come up quite often recently. HOW to do a leak down test or HOW to make a tester? so i thought i would post a sticky (not sure how to do that. so here's a post)on the subject.

you'll need to borrow or make your own tester such as this one....

http://i247.photobucket.com/albums/gg142/86_Quad_R/IM000597.jpg

to make one you'll need:

1. a blood pressure bulb- can be gotten at most any drug store

2. a small brass nipple- can be gotten at local auto parts store. it is to be threaded into either the end or the side of the pvc cap.

3. a low pressure gage- can be gotten at local weld/tool supply. it is to be threaded into the pvc cap aswell.

4. a short stick of pvc pipe(that'll fit the intake boot) and a cap(to be glued onto the pvc pipe.

5. a peice of hose (3/16 to 5/16" will do)

it clamps into your intake boot and allows you to test the whole system.

you'll need to make a gasket that'll clamp between the exhaust flang and engine. my favorate is to use an inner tube from a bicycle.

as a rule of thumb, pump the system up (no more than 10 psi's and allow to set for at least 10 minutes.

during this time you spay the external engine with a soap/water mix to check for leaks(any leak will bubble up like a foam). this includes the crank case vent tube aswell.

ideally you want the psi's to remain constant for the 10 minutes but a pound per minute is acceptable but not to exceed 5 lbs.

Posted by: wykyd z400

Great post!! Very informative!!

Posted by: kiesta00

sticky this badboy

Posted by: kgordon7378

just to clarify, the exhaust port should be plugged. your example is with a inner tube. I have heard of using other things, but that sounds easier and cleaner. Also, plug in tight. Also, if you are loosing pressure, the soapy water is great to locate.