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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 05-27-2014, 10:44 PM   #1
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Join Date: Jan 2014
Location: Lebanon, OH USA
Posts: 74
My Ride: '00 323ci
Leak down test DIY/details?

Hi guys, is there any DIY on a leak down test? Doesn't seem difficult to perform at all, but I still miss a few things, probably because I don't know much about the internals of the engine.

Things that I don't know and was not able to find out:
-should I leave all spark plugs in but the one cylinder I am testing? Some says so, some say to take them all out so that its easier to turn the engine and find Top Dead Center (TDC)
-I have to find TDC for each cylinder right? If so, what cylinders are linked and have the same TDC?
-lastly, to get the TDC, as far as I know, the best method is to stick a long screwdriver in spark plug hole, and turn the crank pulley (engine in neutral!) until screwdriver reaches the top of the cylinder course. Seems easy enough, but is there an even easier method?
-how do I know I am on the compression stroke and not exhaust? Just because it will leak like crazy on the exhaust stroke, or is there another way to tell?

Last edited by Icucicu; 05-27-2014 at 10:45 PM.
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