Page 1 of 3 123 LastLast
Results 1 to 10 of 27

Thread: Resurfaced heads..... machined or belt sanded?

  1. #1
    Turbo Timebomb Feedback Score 0
    Join Date
    Sep 2010
    Owner Since

    Location
    Elkhart, IN
    Posts
    59
    Thanks
    2
    Thanked 0 Times in 0 Posts

    Resurfaced heads..... machined or belt sanded?

    Okay, not a machinist here, something seems a bit screwy. I had my heads resurfaced a long time ago by Napa. I got them back and the surface was nice and shiny, perfectly smoothe. I had another set of heads done recently by a performance shop Pro-Motor which a lot of people seem to like the place. When I dropped them off, he asked if they had been previously belt sanded. I didn't really think about it until I got the heads back and you could see the tooling lines. He used what appeared to be a CNC mill w/ a large-diameter round disk with the tooling mounted near the outside of it. Were the heads belt sanded smoothe before? I would assume this is not a good idea. One of my concerns is the machining lines can be felt w/ my thumbnail, is this going to be a problem? I did a little google image search and found both situations, anyone have any inseight on this?

    ***
    the reason the heads are off is a graphite head gasket failure, bought multilayered steel this time.
    ***
    Last edited by Ben_Pow!!; 09-20-2010 at 01:41 PM.

  2. #2
    owner since 2004 Feedback Score 0 colt45 gto's Avatar
    Join Date
    Sep 2010
    Owner Since
    2004

    Location
    cheshire, england
    Posts
    330
    Thanks
    20
    Thanked 28 Times in 15 Posts
    once the heads are milled they should be smooth you shouldn't feel anything.

    sounds like a poor job to me. dunno what they mean about belt sanding? never heard of this on heads before.
    3si is dead long live 3sgto.org

  3. #3
    LW fears my posts Not Verified Feedback Score 1 (100%)
    Join Date
    Sep 2010
    Owner Since
    1996, 1st Stealth TT; 2000, current TT

    Location
    Dallas TX
    Posts
    703
    Thanks
    61
    Thanked 119 Times in 100 Posts
    Some shops don't have the proper tooling to mill a cylinder head. But if they have a decent sized belt sander, you can usually fit a V6 cylinder head on there. It isn't the most professional way of doing things, but unless your heads were severely warped, they should be fine.

  4. #4
    BAD ASS - I've got one Not Verified
    supporter
    Feedback Score 8 (100%) j2k4's Avatar
    Join Date
    Sep 2010
    Owner Since
    2/2010

    Location
    L'Anse, MI
    Posts
    2,130
    Thanks
    1,004
    Thanked 490 Times in 391 Posts
    Quote Originally Posted by colt45 gto View Post
    once the heads are milled they should be smooth you shouldn't feel anything.

    sounds like a poor job to me. dunno what they mean about belt sanding? never heard of this on heads before.
    If you were told they were "belt-sanded" I'd be going over them every which way with a straight-edge to check them.

    As far as milling, generally they should be pretty damn smooth, with just the faintest tool marks.

    Depending on the application/head-gasket type, some shops will run a higher feed rate on the mill to give the head a bit more tooth to "grab" on the head surface - less of that going on, these days, but.
    Last edited by j2k4; 09-20-2010 at 07:14 PM.
    Ranked No. #1 in initial quality



    Idiots, simply by being idiots, seem capable of achieving randomly bad things that are beyond the imaginings of sensible people.

  5. #5
    Here for the party Not Verified Feedback Score 1 (100%) CoreyB's Avatar
    Join Date
    Sep 2010
    Owner Since
    2006

    Location
    Canaan NH
    Posts
    1,748
    Thanks
    366
    Thanked 108 Times in 89 Posts
    I would never belt sand heads.

  6. #6
    owner since 2004 Feedback Score 0 colt45 gto's Avatar
    Join Date
    Sep 2010
    Owner Since
    2004

    Location
    cheshire, england
    Posts
    330
    Thanks
    20
    Thanked 28 Times in 15 Posts
    i would claim for a new head if a machine shop belt sanded my heads, only a milling machine can get a perfect surface.

  7. #7
    Squivelicious Not Verified Feedback Score 1 (100%) AaronVR4's Avatar
    Join Date
    Sep 2010
    Owner Since
    February 2004

    Location
    West Texas
    Posts
    94
    Blog Entries
    1
    Thanks
    1
    Thanked 0 Times in 0 Posts
    I used to rebuild heads in high school. Would belt sand before competitions.

  8. #8
    Turbo Timebomb Feedback Score 0
    Join Date
    Sep 2010
    Owner Since

    Location
    Elkhart, IN
    Posts
    59
    Thanks
    2
    Thanked 0 Times in 0 Posts
    Yeah, I'm sure the surface itself is not warped after the job, but it's the machining "grooves" I'm concerned about. I imagine if they are too deep, this will allow gas to escape and right into the oil/coolant passage they pass through, but I don't know. Like I said, it's not very deep, but you can certainly feel it w/ your fingernail and visually see them. This shop is always busy w/ work, so I have a pretty good % of beeing OK. I'm going to give him a call and see what he says about it.

  9. #9
    owner since 2004 Feedback Score 0 colt45 gto's Avatar
    Join Date
    Sep 2010
    Owner Since
    2004

    Location
    cheshire, england
    Posts
    330
    Thanks
    20
    Thanked 28 Times in 15 Posts
    post a pic up ben

  10. #10
    1st ever COTM and COTY verified Feedback Score 9 (100%) green-lantern's Avatar
    Join Date
    Aug 2010
    Owner Since
    Birth

    Location
    Tennessee
    Posts
    7,254
    Thanks
    652
    Thanked 459 Times in 354 Posts
    Mine had these groves you speak of and they were done by a reputable shop also. I didn't like it at first but was assured it was OK. I haven’t had any trouble yet.

    Quote Originally Posted by HilbillyHomeboy View Post
    I bet she smells of old mustard and sawdust.
    Jeremy

Page 1 of 3 123 LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
3000GT / Stealth / GTO Resources
3000GT / Stealth / GTO / Multi-site Classifieds
3000GT/Stealth/GTO Event Pages
3S National Gathering
East Coast Gathering
Upper Mid-West Gathering
Blue Ridge Gathering
3000GT/Stealth/GTO Clubs and Groups
Michigan 3S
MInnesota 3S
Wisconsin 3S
Iowa, Nebraska, Kansas 3S
North California 3000GT/Stealth
United Society of 3S Owners
3000GT/Stealth/GTO Forums
3000GT/Stealth International
3000GT/Stealth/GTO Information and Resources
Team 3S
3000GT / Stealth / GTO Information
daveblack.net
The 3000GT/Stealth/GTO Web History Project
3000gt.com
3000GT / Stealth International WWWboard Archive