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first stage rings? mch 5

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  • alpacafarmer
    started a topic first stage rings? mch 5

    first stage rings? mch 5

    Im' replacing the first stage rings. My question is the piston had 3 rings and the package I got has 4. 2 with holes and 2 without. The piston has a place that I could put the 4th ring below wrist pin.

  • cngtennessee
    replied
    Got it figured out but thanks for posting a reply

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  • BritCNGUser
    replied
    One more go

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  • BritCNGUser
    replied
    I don't get on here too often and I'm guessing you've worked it out by now. Anyways, I tried to upload pix of my strip-down. I Failed. 400K 800 pixel files insist on no display
    Last edited by BritCNGUser; 04-10-2018, 06:33 PM.

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  • cngtennessee
    replied
    Originally posted by alpacafarmer View Post
    Also looking for the orientation of the first stage valve. There is an S on one side with 4 positions available. Intake side or outgoing? facing the piston or the head?
    did you find out what the orientation is for the 1st stage valve? Is the S facing head or piston? I am in the same boat and can't figure out orientation. Thanks

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  • BritCNGUser
    replied
    FWIW, running in does take time. Bedding down rings, here's my experience. Ran Coltri's own or Anderol 755 which I'm told Bauer brand as Bauer N28355. On trdscfjc's lead swapped to Royal Purple's own CNG specific blend. Note Bauer also have a CNG specific blend so either trdscfjc and I are being sold snake-oil or somebody knows something.

    Now I've also jsut fitted a complete frist stage, thus new cylinder, gudgeon-pin, piston, rings and valve-plate. I got my brand-spanking cylinder and honed it, Now whether this was unnecessary, I'll never know , but ex-factory no honing was visible. It's been running at least 25 hours and only now has first stage pressure stated to rise, so the running in does take time. Is that my oil choice causing this? If it is, that's very good long-term, but frankly I don't know and have no way of telling.

    As an aside, I've put this link up before, but I got my first stage valve plate from here:

    http://www.airkompressor31.fr/en/pie...ischarge-.html

    Very cheap.
    Last edited by BritCNGUser; 08-25-2017, 01:46 AM.

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  • cngmike
    replied
    Most of the problems had been on a Ingersoll Rand H40 which is not a great compressor in the first place (Royco Royal). I also ran a synthetic in a Hurricane built by Grimmer-Shimmit (Mobile 1), another compressor of dubious build quality. The main problem was bottom end failure but also ring break in and seal issues.

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  • cngtennessee
    replied
    Cngmike, While running synthetics in various compressors what type of bad luck did you encounter?

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  • cngmike
    replied
    I run Mobile Rarus 427. I have not had great luck running synthetics in most CNG compressors. The ones I did I would run 427 then change to synthetics after the first oil change.

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  • trdscfjc
    replied
    Originally posted by alpacafarmer View Post
    Update. After 2 months of fighting with this and changing out rings I finally talked to a guy that has been been rebuilding cng compressors for years. Told him the problems I was having and he asked me what type of oil I was using. I told him and he laughed and said good luck with that. He was talking about oils and additives and lack of air in cng systems. Most of what he said went over my head but the point I did get was that full synthetic oil was to slick to seat the rings. He handed me a jug of Mobile DTE and told me to run that in my compressor for a couple of hours. This is the only oil he uses in compressors and I don't know what the long term effect would be on my little Coltri but it is tempting to try because it is about 20% the cost of Nuvair. I ran it for a couple of hours and it did seat the rings. Drained it out flushed the system and refilled with 751.


    that is similar to the CE750, one of the engineers @ RP told me the equivalent is NGL150, been using that for a few years...been happy with it so far, i live in a sunny climate so there is no need to change but they do have thinner and thicker versions that could be used depending on your ambient temps (thicker for warmer areas, thinner for colder areas)

    wouldnt be a bad idea to have 2 types in stock (winter and summer oils)

    Keep us posted AF

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  • alpacafarmer
    replied
    Update. After 2 months of fighting with this and changing out rings I finally talked to a guy that has been been rebuilding cng compressors for years. Told him the problems I was having and he asked me what type of oil I was using. I told him and he laughed and said good luck with that. He was talking about oils and additives and lack of air in cng systems. Most of what he said went over my head but the point I did get was that full synthetic oil was to slick to seat the rings. He handed me a jug of Mobile DTE and told me to run that in my compressor for a couple of hours. This is the only oil he uses in compressors and I don't know what the long term effect would be on my little Coltri but it is tempting to try because it is about 20% the cost of Nuvair. I ran it for a couple of hours and it did seat the rings. Drained it out flushed the system and refilled with 751.

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  • trdscfjc
    replied
    good stuff brit

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  • BritCNGUser
    replied
    Coltri1stStageRingFitment 27-06-2017 02.jpg Coltri1stStageRingFitment 27-06-2017 01.jpg

    These pics not mine, these are from Italy, the horse's mouth... Coltri. If unmarked, all rings have a bevel, all bevels up. Note: 1) Second ring down has the step. 2) 2 x oil control rings. One, third ring down; One more, fourth ring down (at the very bottom). Which, ex-factory is not how mine came, but hey-ho... I notice they've changed the Parts catalogue since, so must be an update.

    You lucky boy.
    Last edited by BritCNGUser; 06-29-2017, 04:23 PM.

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  • alpacafarmer
    replied
    OK, Brit your up. New rings arrived today and will be installed bevel up. Wish me luck.

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  • BritCNGUser
    replied
    I can vouch for a Flexhone. Great things, just very pricey our side of the pond, but a Yank product, so much cheaper for you. Had to do a brake caliper recon job recently, and just so happened to be a 60mm bore in the caliper too, so it got used again. But that was VERY lucky. Biggest snag is unlike the cheapo tripod 'efforts', they work over such a limited size range, you would need large sets of the things. Whereas the tripod covers the lot, although I won't pretend it is anything like as good.

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