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Thread: Cat 30 Piston Clearance

  1. #1
    Join Date
    Nov 2006
    Location
    Texas
    Posts
    137

    Default Cat 30 Piston Clearance

    Working on engine rebuild for my cat 30 and machine shop needs piston/cylinder
    pecs for cast iron pistons. Also what was the standard bore size. This engine is well
    used .

    I will appreciate any and all help

    Thanks Claney

  2. #2

    Default piston clearance

    Cat specs. .005 to .007 clearance on 4,3/4 bore thirty encine

  3. #3
    Join Date
    Nov 2006
    Location
    Texas
    Posts
    137

    Default

    Thanks much Russell. Now the machine shop can go back to work.

    Keep virus free and have a good summer.

    Claney

  4. #4
    Join Date
    May 2007
    Location
    Northern Victoria, Australia
    Posts
    2,776

    Default

    Claney, nice to see you back online, are you going to re-sleeve those cylinders, I have 3 sets of flogged out 30 cylinders here in Oz I need to decide on what to do, 2 of the sets have been re-sleeved a million hours ago and flogged those sleeves out, so my options are limited, I was told last week that Chad Enyeart was re-sleeving 30 cylinders and offering them for sale, I sent him a email but haven't got a reply yet.
    All the best
    Mike

  5. #5
    Join Date
    Aug 2007
    Location
    Qld Australia
    Posts
    612

    Default 30 Sleeves

    Hi Mike, What Length are the Sleeves , We have a Chap near here that does a lot of Sleeve Work, Does a great job and Reasonable. So give Me the Measurements and I will check Him out . Has done several for Me and a Mate .LJ

  6. #6
    Join Date
    May 2007
    Location
    Northern Victoria, Australia
    Posts
    2,776

    Default

    Morning Lance, the cylinders are 13.5" long, thanks for offering to ask.
    All the best
    Mike

  7. #7
    Join Date
    Aug 2007
    Location
    Qld Australia
    Posts
    612

    Default

    Hi Mike, My man got back to Me last Night, Unfortunately His Boring Bar can only Handle 12" max.Surely there is some One down in the Socialist Republic of Victoria that has a Larger Unit to Help out . another thought up here in the Banana Republic would be Mendams in Brisbane, don't have a Number though, Maybe Ivantighe Eng. 07-33088888 would be worth a try, They do specialise in Crank and Cam Grinding, but would worth a ring. LJ

  8. #8
    Join Date
    May 2007
    Location
    Northern Victoria, Australia
    Posts
    2,776

    Default

    OK Lance, thanks for checking, I'm sure there is somewhere that can do them.
    All the best
    Mike

  9. #9
    Join Date
    May 2007
    Location
    Northern Victoria, Australia
    Posts
    2,776

    Default

    The longest sleeve I have found here in Oz is 12" for that bore size, not being a Machinist or having seen sleeves fitted, but read here previously they get fitted with a lip in the cylinder to prevent them being pulled down into the crankshaft, I wonder if the boring bar only needs to cut down 12" for the new sleeve, and the final clean up of the new bore is done by 4 stone hones, or are the new sleeves bored to size then honed?
    Thanks
    Mike

  10. #10
    Join Date
    Feb 2016
    Location
    southern NSW Australia
    Posts
    114

    Default

    Quote Originally Posted by Mike Meyer View Post
    The longest sleeve I have found here in Oz is 12" for that bore size, not being a Machinist or having seen sleeves fitted, but read here previously they get fitted with a lip in the cylinder to prevent them being pulled down into the crankshaft, I wonder if the boring bar only needs to cut down 12" for the new sleeve, and the final clean up of the new bore is done by 4 stone hones, or are the new sleeves bored to size then honed?
    Thanks
    Mike
    I'm Guessing the inserts would be already to size on the ID and come with a recommended interference. I have done them but left the trade in 2002 so a bit out of touch.
    Regarding the boring bar. We used to make them every day of the week to suit the range of jobs that were landed on our shop floor. Most Fitter/machinists would be able to make one if they didn't have one to get the required 12'' or more you mention. we used to bronze carbide tips to any solid bar we could find laying around the shop to make a home made boring bar LOL. They worked fine, but like most things just not taught anymore to apprentices.

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