Register now to get rid of these ads!

Technical SBC wear?

Discussion in 'The Hokey Ass Message Board' started by Fry, Jul 24, 2019.

  1. Fry
    Joined: Nov 14, 2002
    Posts: 986

    Fry
    Member
    from SK, Canada

    Had a rocker stud pull and I’m going to get my heads machined for screw in studs.
    Pulled the heads and thought the cylinders were shined up more than I thought they should.
    It’s a mild 327, fully rebuilt 2500 miles ago.
    Is this normal wear?
    The diesels I work on for a living would still have like new cross hatch after 2-3000 hours. But I’m not experienced with older gas engines, I just expected it to look new still.
    It’s hard to get a good picture so hopefully good enough
    . 42400D20-3D79-4621-A7C1-85908DCFA13A.jpeg C2362A8A-A344-41CF-AA97-5F9AFFFF1DDE.jpeg AAD4AD29-ACC7-48BF-8A55-0119C6141852.jpeg 6B96B9BA-132D-4771-8AF0-0E5B390F913E.jpeg
     

    Attached Files:

    loudbang likes this.
  2. Was the cross-hatching evident when you got it back from the re-builder or was it completely re-assembled when you got it back?
     
    loudbang likes this.
  3. crossthread
    Joined: Mar 9, 2006
    Posts: 103

    crossthread
    Member

    I have seen that when block was not cleaned well enough after shop work . Grit from honing and /or molly rings . Might want to pull pistons and crank and ball hone clean and put back together
     
    loudbang likes this.
  4. squirrel
    Joined: Sep 23, 2004
    Posts: 55,941

    squirrel
    Member

    I would not worry about it....it looks way too normal to me.
     

  5. Fry
    Joined: Nov 14, 2002
    Posts: 986

    Fry
    Member
    from SK, Canada

    Thanks Squirrel. Just wanted reassurance.
     
    lothiandon1940 and loudbang like this.
  6. Don’t worry, it will be fine. I still see cross-hatching. The diesels that you and I work on have different piston ring packages and have to withstand a lot more heavy use than car engines. I would also guess that our cylinder liners have a higher nickel content in the iron.


    Sent from my iPhone using The H.A.M.B. mobile app
     
    loudbang and 427 sleeper like this.
  7. big duece
    Joined: Jul 28, 2008
    Posts: 6,830

    big duece
    Member
    from kansas

    Which rings are you using, and oil?
     
    loudbang likes this.
  8. I agree that it looks normal, sometimes we make this old car stuff way to complicated


    Sent from my iPhone using H.A.M.B.
     
    loudbang likes this.
  9. Blues4U
    Joined: Oct 1, 2015
    Posts: 7,589

    Blues4U
    Member
    from So Cal

    I'd say that is a LOT of wear for 2500 miles, should not be typical. Polishing like that is usually the result of carbon deposits in and around the ring grooves and lands, restricting free movement of the rings in the grooves, and that usually takes a lot more than 2500 miles.
     
  10. deathrowdave
    Joined: May 27, 2014
    Posts: 3,518

    deathrowdave
    ALLIANCE MEMBER
    from NKy

    I think it will be fine . My feelings are this is a product of over carbing , fuel wash .
     
  11. MAD MIKE
    Joined: Aug 1, 2009
    Posts: 772

    MAD MIKE
    Member
    from 94577

    Doesn't look bad.
    Fingernail test it.
    If those 'score' marks are more prominent than the cross hatch you might want to verify clearances.
    Otherwise its most likely just an artifact being it is on the thrust surfaces and not anywhere else on the bore. Albeit if you look at the cylinders perpendicular you will see similar marks on the sidewalls.
    Look for any polished smooth areas, that would be more indicative of wash down.
     
  12. X-cpe
    Joined: Mar 9, 2018
    Posts: 1,959

    X-cpe

    In a lot of places in those pictures it appears to me that the cross hatch marks go over the vertical scuff marks.
     

Share This Page

Register now to get rid of these ads!

Archive

Copyright © 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. Terms of Service. Privacy Policy.

Atomic Industry
Forum software by XenForo™ ©2010-2014 XenForo Ltd.