Compression test... I have some doubts
Tourer
Joined: Sep 2010
Posts: 471
Likes: 9
From: Far NorCal
I'll tell ya"ll something, a little back yard mechanicing if ya will.
Find the compression stroke on a cylinder, then put about 20 psi compressed air into the cylinder via the plug hole using an adapter for your air hose. Next use your ears....meaning, go listen at the end of your pipes, your intake and at the bottom of your crankcase. What you are listening for is air at these locations. If you hear air escaping at the breather you have an intake valve problem....hear air at the exhaust, you have an exhaust valve problem..and if you hear air at the bottom of the engine or the oil pan you have a ring problem....
$0.02
Find the compression stroke on a cylinder, then put about 20 psi compressed air into the cylinder via the plug hole using an adapter for your air hose. Next use your ears....meaning, go listen at the end of your pipes, your intake and at the bottom of your crankcase. What you are listening for is air at these locations. If you hear air escaping at the breather you have an intake valve problem....hear air at the exhaust, you have an exhaust valve problem..and if you hear air at the bottom of the engine or the oil pan you have a ring problem....
$0.02
Tourer
Joined: Feb 2015
Posts: 264
Likes: 24
From: Jackson, MS
Craftsman compression tool
This is a good compression tester from Craftsman. Not sure if it is a MIC tool, but it works good. Has all the pieces for testing compression on almost any vehicle.
http://www.sears.com/craftsman-compr...1&blockType=G1
MIC = Made in China
Good luck, Shimaze
http://www.sears.com/craftsman-compr...1&blockType=G1
MIC = Made in China
Good luck, Shimaze
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Tourer
Joined: Sep 2006
Posts: 357
Likes: 5
From: Valencia, Spain
Since then, I've ridden it about 16000 miles more, so we can consider that the mileage is about 36000 miles, but there's a posibility that it can be more.
I've been trying to locate the exact place from where comes the sounds and I've decided to buy a mechanic stethoscope to locate it. While, I'll test the primary chain adjustment to make sure that the sound doesn't comes from a loose chain.
Thanks a lot for all your posts and as I've said before, I'll do the test and I'll post the results here.
Seasoned HDF Member
Joined: Jun 2010
Posts: 9,332
Likes: 3,873
From: Upstate New York
Another thing to check for is an exhaust leak at the exhaust port. An exhaust leak can mimic any number of internal noises. I've found that re-using the exhaust port gaskets is practically asking for a leak. Happened to me last summer. Thought I needed a top-end job. Turned out to be an exhaust leak from when I had the cam cover off. Getting everything together just right can be a bit tricky.
Yeah, check the primary chain, too. Always start with the stupid stuff first.
Yeah, check the primary chain, too. Always start with the stupid stuff first.
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Tourer
Joined: Sep 2006
Posts: 357
Likes: 5
From: Valencia, Spain
Well, I have news for this thread but... they are not good news. In fact, they are really bad news.
As the news are not related to the compression test itself, I've opened a new threat to talk about it. You can read it here:
https://www.hdforums.com/forum/evo-c...road-king.html
Thanks,
Javi
As the news are not related to the compression test itself, I've opened a new threat to talk about it. You can read it here:
https://www.hdforums.com/forum/evo-c...road-king.html
Thanks,
Javi
Last edited by Javieret; Apr 9, 2015 at 06:04 AM.
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