Ring gap clarification - JeepForum.com
 
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post #1 of 7 Old 05-23-2019, 06:56 PM Thread Starter
Robbiescd
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Ok guys....read in one manual that the ring gaps for top and 2nd ring should be .010 to .020. Another (chilton manual) says .008 to .014 for top ring and .012 to .023 on 2nd.

I’m getting .009 on top and .013 on bottom. Rings are manufactured by Mahle.

Am I safe?

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post #2 of 7 Old 05-23-2019, 08:01 PM Thread Starter
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From what I’ve been reading, the ring gap should be .004 times the bore size. This is the first bore at .030 over, so

(3.75 + .030) * .004 = .01512


So assuming this is right, I need to do some filing! Never done that before!
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post #3 of 7 Old 05-23-2019, 08:18 PM
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Specs are specs. do ii to specs. You now are getting a taste of why building an engine yourself can be that little bit better.

If you cannot fix it with a hammer then it has to be an electrical problem.
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post #4 of 7 Old 05-23-2019, 08:22 PM Thread Starter
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Quote:
Originally Posted by Boojo35 View Post
Specs are specs. do ii to specs. You now are getting a taste of why building an engine yourself can be that little bit better.
I’m going to call ring manufacturer to make sure I’m correct on those figures. I would have just assumed it would have been closer to being “right” than that far off.

I’m also wondering if I shouldn’t have sources this out! May have bitten off more than I can chew!
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post #5 of 7 Old 05-23-2019, 08:48 PM
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Originally Posted by Robbiescd View Post
May have bitten off more than I can chew!
Nope. People always praise reman engines and warranties. Speak highly of their machinery, processes and whatever. In the end. The have 55 gallon drums of piston rings and take a chance. Dont measure a damn thing. They take the law of averages.

If you cannot fix it with a hammer then it has to be an electrical problem.
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post #6 of 7 Old 05-23-2019, 08:55 PM Thread Starter
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Your right. Just “new” things like filing rings make me nervous! There always a first, just have to research the “how to do it”. Cheapest way I’ve seen is using a file and filing one side of the ring.
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post #7 of 7 Old 05-24-2019, 07:58 AM Thread Starter
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Spoke with Mahle and they said .009 ring gap in top ring would be fine. Specs call for .010 to .020. He said that ring gap information has changed over the past 30 years. If I’m not doing nitros or heavy duty mudding, I should be fine. He also said that once the rings wear in, the gap will open up slightly. He advised not filing to get .001 more on the ring gap.

I’m going to re-seat them and test gaps again just to double check.
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