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Re: Compression Test

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John in La

01-16-2013 19:50:29

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A leak down tester requires a air compressor to use it and some do not have that ability. It will also confirm a blown head gasket by showing bubbles in the radiator that way you can get pump cavitation out of the possible source of bubbles you saw already.
If you do not want to spend the money on a one time use for a leak down tester you can buy a replacement hose for a leak down tester and use it to shoot air into the cylinder. This will not show leak down but will pressurize the cylinder so you can see if bubbles appear in the radiator.

While a compression test will show what cylinder is bad it does not narrow down the possible causes. This is where a leak down test comes in. Applying air to the cylinder lets you know if it is a head gasket (bubbles in radiator) an exhaust/intake valve (hissing air in tail pipe or intake) or a bad piston/rings (pressure in crankcase)

With all that said I really do not think you need a leak down test. We already know if the compression test shows a bad cylinder it is most likely going to be a head gasket or a cracked head because bubbles in radiator have been seen.

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01-17-2013 05:10:39

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 Re: Compression Test in reply to John in La, 01-16-2013 19:50:29  
you can make a cyl adapter with an old spark plug and an air fitting.

bust the insulator out and remov ethe electrodes.. and then solder/braze/weld a male qd on it. perhaps an angle fitting first if planned to use on an N.. coud weld on a female threaded 90 and then just screw inthe male qd air adapter.. etc.

poor mans leak tester. then just about any air pump or air up tank will work for ya.,

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