Results 1 to 4 of 4

Thread: Carbon buildup

  1. 5th December 2013, 07:09 PM #1
    s851 Guest

    Question Carbon buildup

    Hi all,

    Just got the head of my 2.25P (IIA, 1972 ex Mil) and this is what the tops of the pistons look like. The engine has done 36,000 miles; does anyone have any experience with this? Is this an acceptable level of buildup?

    Wasn't planning to remove the pistons...

    Thanks
    Philipp
    Attached Images Attached Images
    Reply With Quote Reply With Quote
  2. 5th December 2013, 07:18 PM #2
    Blknight.aus's Avatar
    Blknight.aus
    Blknight.aus is offline RoverLord Vendor
    Join Date
    Aug 2006
    Location
    Melbourn(ish)
    Posts
    26,495
    Total Downloaded
    0
    thats not too bad aand IVe seen worse.

    if the compression was good its most likely from

    1. not enough advance for the running conditions
    2. running to rich
    3. leaking inlet valve stem seals.
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    Tdi autoManual d1 (gave it to the Mupion)
    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
    If you think you're in front on the deal, pay it forwards.
    Reply With Quote Reply With Quote
  3. 6th December 2013, 11:34 AM #3
    s851 Guest
    Thanks Dave, yeah compression was bang on for all four and the machine shop guys said the vale stems were shot, so that might be the cause..

    I think i'll just leave them as they are then.

    thanks again
    P
    Reply With Quote Reply With Quote
  4. 6th December 2013, 01:58 PM #4
    JDNSW's Avatar
    JDNSW
    JDNSW is online now RoverLord Silver Subscriber
    Join Date
    Jan 1970
    Location
    Central West NSW
    Posts
    29,511
    Total Downloaded
    0
    I would describe that as pretty normal - probably it is burning oil, which may be from, as suggested, valve stem seals, or past the rings (not necessarily correlated with compression) or even overfilling of the air cleaner. This engine always uses a lot more oil than is acceptable in modern engines, and some of this oil consumption inevitably ends up as carbon in the combustion chamber.

    John
    John

    JDNSW
    1986 110 County 3.9 diesel
    1970 2a 109 2.25 petrol
    Reply With Quote Reply With Quote
« So I now also have a 2a.... | 4 cylinder heatshields »

Tags for this Thread

Bookmarks

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
  •  

Forum Rules

Search AULRO.com ONLY!
 Search All the Web!