Ring Gap Alignment

Author Topic: Ring Gap Alignment  (Read 1005 times)

Offline AMXguy

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Ring Gap Alignment
« on: March 04, 2010 - 05:28:40 PM »
I've always put my compression rings 180 degrees apart along the pin and the oil rings 180 degrees apart opposite of the pin. I see lots of theories and ways you're supposed to align your ring gaps and my way is supposed to be wrong though I never hear why.

 Any opinions on this and as long as they're not very close to being lined up does it really matter that much?
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Offline Daves74chally

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Re: Ring Gap Alignment
« Reply #1 on: March 04, 2010 - 05:37:29 PM »
Thats how I did my engine. just did the rings on a Cat D2 diesel. 5 ring piston. Try to work with that, its tricky.

But I was taught that what really matters is that they are evenly apart. Some books say on a three ring piston to be 120 apart. I guess it really matters on application.
« Last Edit: March 04, 2010 - 05:45:12 PM by Daves74chally »
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Offline 426HEMI

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Re: Ring Gap Alignment
« Reply #2 on: March 04, 2010 - 06:30:49 PM »
I have heard so many things on this.  Just as long as they do not line up I would say it would be ok.  I watched a guy put on a set of rings in about 35 sec I think if I remember right at a GM reman plant.  I know he did not watch how they were going on. 
Got a pretty good start on my M46 optioned Barracuda restoration but now it is on hold till I can gather more funds.  Still need a few parts for it.  SIU Graduate 75 AAS Automotive Tech, 94 BS Advanced Tech Studies, 1997 MSED Workforce Education and Development

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Offline Aussie Challenger

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Re: Ring Gap Alignment
« Reply #3 on: March 05, 2010 - 05:12:47 AM »
I always make sure that they are 180* apart, that way when the ring compressor is fitted if they move slightly they still have no way of lining up. I also do the same for the oil ring spacers.   :bigsmile:
Dave

Offline Strawdawg

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Re: Ring Gap Alignment
« Reply #4 on: March 05, 2010 - 10:15:36 AM »
It is not absolutely critical...the idea is to spread the gaps out so that they will not line up and allow combustion gas to have a straight shot to the pan...separating them as described makes it very hard for this to ever happen even if the rings rotate slightly.

Offline moper

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Re: Ring Gap Alignment
« Reply #5 on: March 05, 2010 - 11:03:58 AM »
Yup.. rings rotate around a piston while ir runs and staggering them keps the odds down that they end up together. I always do the 180° deal on mine, and the oil expander and the two rings are all staggered too.

Offline femtnmax

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Re: Ring Gap Alignment
« Reply #6 on: March 05, 2010 - 11:24:38 PM »
I was told to not put the gaps on the thrust faces of the piston, so I stagger the two compression rings 180 apart just off the thrust face, so about half way between the pin axis and thrust face. Then locate the two oil scrappers 180 apart and on the opposite sides of the piston skirts from the compression rings.   But as moper said the rings will rotate as the engine runs.  And as said your just looking to avoid ring gap alignment at initial assembly.
By the way be sure to NOT USE a band type ring compressor that rotates in on itself with an allan drive on the outside. These POS compressors will rotate the rings and make the gaps line up.  Use a clamp type that use big pliers to clamp or the type with round tapered cylinders.
Phil

Offline moper

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Re: Ring Gap Alignment
« Reply #7 on: March 06, 2010 - 12:38:18 PM »
fent... Not to be disagreeable but I've had the same ring compressor since I was 17. That's 23 years, probably 40-50 engines over that time. That's the springy band type with the 1/4 drive wratchet to tighten. The rings don't move by the tool's action.