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post #1 of (permalink) Old 10-04-2003, 02:35 PM Thread Starter
 
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Motor questions Could the rings be bad?

I am working (or about to) on my cousins Samurai. It smokes pretty good and I am wondering if it needs a full rebuild or just the head with valves redone. What kind of checks can I do to tell me if the lower end is ok. Will a compression test at the spark plug hole tell me if the bottom end is good or will it just tell me if there is compression loss in the heads. The spark plugs all look carboned up with some oil residue on a couple of them. I am going to study my manual tonight....Any input would be appreciated. I was thinking of putting a rebuilt head on it if possible.

Mark



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post #2 of (permalink) Old 10-04-2003, 09:39 PM
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Re: Motor questions Could the rings be bad?

</font><blockquote><font class="small">In reply to:</font><hr />
I am working (or about to) on my cousins Samurai. It smokes pretty good and I am wondering if it needs a full rebuild

[/ QUOTE ]

What your cousin's samurai needs is a qualified mechanic.

~daxe
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post #3 of (permalink) Old 10-05-2003, 09:08 AM
 
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Re: Motor questions Could the rings be bad?

Does it smoke on start up, or all the time? If it smokes on start up then it's the valve seals but if it always smokes then it's the rings.
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post #4 of (permalink) Old 10-05-2003, 09:19 AM
 
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Re: Motor questions Could the rings be bad?

When you do the compression tests, make sure you run two seperate tests. The first one is called dry. The second is called wet, it is called wet because you squirt oil into the plug hole. If the rings are worned the additional oil will help seal the piston. If no change then the top end is the culprit.

There are others here that can give you a more specific break down of indications.
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post #5 of (permalink) Old 10-05-2003, 09:37 AM
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Re: Motor questions Could the rings be bad?

</font><blockquote><font class="small">In reply to:</font><hr />
If the rings are worned the additional oil will help seal the piston. If no change then the top end is the culprit.



[/ QUOTE ] That's a procedure that is a good indicator of a driveability issue but i have many times seen a broken or sludged up oil ring(s) causiing excessive smoke that has had a nearly perfect and even compression test. IMHO, don't freshen up the top end and leave a weak bottom end. It's like washing toilet paper.
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post #6 of (permalink) Old 10-05-2003, 10:23 AM
 
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Re: Motor questions Could the rings be bad?

I did that [img]images/graemlins/chair.gif[/img] UHHHH that is the new top end with old bottom end,~~~~ Not the toilet paper thing [img]images/graemlins/blush.gif[/img]
I actually put on a $600.00 Reynolds HP head on the old bottom end, but in my defense the cam had seized on the old head so I had to have one NOW and things are still a work in progress!! [img]images/graemlins/grin.gif[/img]
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post #7 of (permalink) Old 10-05-2003, 10:36 AM
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Re: Motor questions Could the rings be bad?

</font><blockquote><font class="small">In reply to:</font><hr />
It's like washing toilet paper

[/ QUOTE ]
AAAAAAAAAAAAAAAAAAAAAAAAAAAHAHAHAHAHAHA!

Call around to shops, get quotes for a "leakdown test", you might want to do a general compression test too (cheap, buy a gauge or have a shop do it).

Here's a good web site with info on a leakdown test.
[img]images/graemlins/laugh.gif[/img]
Leak down test.
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