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Old 01-22-2012, 11:01 AM
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how to Pressurize a cylinder with compressed air

How can I how to Pressurize a cylinder with compressed air?
Tried the hose for my compression tester but air will floow through it to cylinder, must have a check valve or one way type valve
any ideas

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Old 01-22-2012, 11:15 AM
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I'll take it you meant air will not flow into cyl. if so use a valve core remover like for a tire and remove the valve core from the compression tester adapter.
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Old 01-22-2012, 11:16 AM
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You do realize that in order to pressurize the cylinder, both the intake and exhaust valves on that cylinder have to be closed ... right?
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Old 01-22-2012, 11:24 AM
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SHould have started at beginning
I did this see below, and was told to remove rocker arms and fill cylinder with air and listen for leaks but cant get and air into cylinder to listen for leaks
I am thinking that I have to ahve bent valves but trying to be sure before tear down, or am I wasting time? Should I jsut go ahead and remove heads? I am getting the idea for all info that bent vavles are probably the problem since it will run badly on two cylinders>
Thanks

Timing chain broke while driving Replaced timing chain, on 1992 Dakota, book said to bring #4 cylinder to TDC compression did that, truck runs but only has compression of 120 on 2 out out of 6 cyls, #4 and #5 has compression
Took valve cover off pass side and cranked and seen all rockers moving etc
Any ideas why no compression on 4 cyls?
Do I need to star removing heads to investigate?
Any ideas appreciated
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Old 01-22-2012, 11:54 AM
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Quote:
Originally Posted by Indybob

Book said to bring #4 cylinder to TDC compression
Really?
Get a different book!

Bring #1 to TDC on the compression stroke.
Install the gears and chain, aligning the timing marks to the centerline.



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Old 01-22-2012, 01:15 PM
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I have built my own using an old sparkplug and the male end of a quick disconnect for your air hose. I break the ceramic out of the old plug and remove the electrode. Weld the air fitting onto the old plug. There are ones you can buy also but I am a Hillbilly that likes making some of my own tools.
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Old 01-22-2012, 06:29 PM
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My compression tester has a check valve in it. It unscrews just like a tire inflation stem with a Schrader valve.
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