Page 1 of 5 123 ... LastLast
Results 1 to 10 of 50

Thread: Series III 2.6L 6-pot massive oil leak from wading plug hole

  1. #1
    Join Date
    Oct 2017
    Location
    Nashville, TN USA
    Posts
    70
    Total Downloaded
    0

    Angry Series III 2.6L 6-pot massive oil leak from wading plug hole

    See Pic attached

    Was so excited to take my completely restored 1981 Series III 109 for its initial shakedown run after almost 8 years of work (that I've done all myself) when I saw a small drip from the wading plug hole. Then the drip became a flow. A serious flow! Oil pressure starts to drop and I shut it down. It is definitely engine oil leaking.

    My initial thoughts was that its a failed rear main seal. For the record the truck had probably about 3 hours of running time on it prior to this event. I've never had a rear main seal fail like this. Need some input here.

    Is there anything else that comes to mind?!?!?

    My plan is to pull the engine and see if I can determine where the failure occurred and obviously fix it. Any suggestions while I'm in the process of pulling the engine?

    Feeling seriously defeated and anxious hoping that it's an obvious failure in the seal or an assembly error on my part. just something that is obvious that I can fix confidently!!!!
    Attached Images Attached Images

  2. #2
    JDNSW's Avatar
    JDNSW is offline RoverLord Silver Subscriber
    Join Date
    Jan 1970
    Location
    Central West NSW
    Posts
    28,806
    Total Downloaded
    0
    It could be either engine oil, gearbox oil, or hydrulic fluid from the slave cylinder. First step, confirm which it is. (mainly smell)

    If it really is engine oil, there does not seem to be any source other than the rear seal.

    But leakage there may have been forced if the crankcase is being pressurised by the crankcase ventilation system being blocked. This engine has closed crankcase ventilation, and misassembly of this can result in it being effectively unventilated, which inevitably means it will build up pressure in the crankcase. If this has happened,it is possible that the seal can remain undamaged.
    John

    JDNSW
    1986 110 County 3.9 diesel
    1970 2a 109 2.25 petrol

  3. #3
    Join Date
    Oct 2017
    Location
    Nashville, TN USA
    Posts
    70
    Total Downloaded
    0
    Wow. This is good. So now you have me thinking about the ccv system. Positive that it is oil and not hydraulic or gear oil.

    suggestions on how to inspect the ccv system to determine if there is a blockage? Does the workshop manual diagram the system? Clearly there was pressure build up.

    if you have suggestions on how to diagnose then I’m all ears. Either now while the engine is relatively undisturbed from this event or once I pull the engine, I’ll follow your suggestions.

    and thank you for your input. Very valuable.

    How does the engine manage pressure build up in the crank case via the CCV?

    Quote Originally Posted by JDNSW View Post
    It could be either engine oil, gearbox oil, or hydraulic fluid from the slave cylinder. First step, confirm which it is. (mainly smell)

    If it really is engine oil, there does not seem to be any source other than the rear seal.

    But leakage there may have been forced if the crankcase is being pressurised by the crankcase ventilation system being blocked. This engine has closed crankcase ventilation, and misassembly of this can result in it being effectively unventilated, which inevitably means it will build up pressure in the crankcase. If this has happened,it is possible that the seal can remain undamaged.

  4. #4
    Join Date
    Sep 2010
    Location
    The Hills.
    Posts
    15,795
    Total Downloaded
    0
    Quote Originally Posted by matthamilton View Post

    How does the engine manage pressure build up in the crank case via the CCV?
    It doesn't. Crankcase ventilation is there mostly to prevent pressure build up. All IC engines will experience some blow by. It has to escape from somewhere. If unventilated then seals are the next weakest link.
    ​JayTee

    Nullus Anxietus

    ​Getting involved in discussions is the best way to learn.

    2000 D2 TD5 Auto: Tins
    1994 D1 300TDi Manual: Dave
    1980 SIII Petrol Tray: Doris
    OKApotamus #74
    Nanocom, D2 TD5 only.

  5. #5
    Join Date
    Oct 2017
    Location
    Nashville, TN USA
    Posts
    70
    Total Downloaded
    0
    so on the Land Rover 2.6l 6-pot how does it vent the pressure buildup? Through what vents in the block it is relieved?



    Quote Originally Posted by Tins View Post
    It doesn't. Crankcase ventilation is there mostly to prevent pressure build up. All IC engines will experience some blow by. It has to escape from somewhere. If unventilated then seals are the next weakest link.

  6. #6
    Join Date
    Sep 2010
    Location
    The Hills.
    Posts
    15,795
    Total Downloaded
    0
    Quote Originally Posted by matthamilton View Post
    so on the Land Rover 2.6l 6-pot how does it vent the pressure buildup? Through what vents in the block it is relieved?
    People like John JDNSW know more about these engines than I ever will and can answer that specific, but the principle is the same. You may find it's as simple as a blocked or incorrectly installed flame trap (603330 in the pic). I don't know about the 2.6, but some engines have a one way valve. If that is installed the wrong way it's the same as being blocked.

    Screenshot 2023-03-08 at 10.10.24 am.png
    ​JayTee

    Nullus Anxietus

    ​Getting involved in discussions is the best way to learn.

    2000 D2 TD5 Auto: Tins
    1994 D1 300TDi Manual: Dave
    1980 SIII Petrol Tray: Doris
    OKApotamus #74
    Nanocom, D2 TD5 only.

  7. #7
    Join Date
    Oct 2017
    Location
    Nashville, TN USA
    Posts
    70
    Total Downloaded
    0
    I just pulled out the workshop manual and was reading about the flame trap. So this is how it's vented back into the carb to re-burn. got it. So here is the entire story: had just pulled the truck out of the garage and backed out and off the edge of my driveway. So the back end was a bit lower than the front. Then the motor stopped. I thought that might be the sign of a stuck float in the Stromberg...at least this is what first came to mind. Took me forever to get restarted and this was unusual since it has been real easy to start. Noticed I had a loose plug in #5 and removed, cleaned all plugs, and finally got started by pulling choke all the way out. It never ran smooth after that. Seemed to be missing and I attributed that to the fouled out plugs. They were dirty and soaked with fuel. I figured I'd run it at a higher idle to help burn off the buildup on the plugs. Started blowing grey/black smoke...again this was new. I still thought that this was just the engine expelling or burning all the excess fuel that had gotten in the cylinders.

    Pulled the truck forward to drive it back in the garage. Got out to make sure it was aligned (small garage) and noticed a drip from the bell housing area. Then pulled it in and noticed the oil pressure was dropping quickly. Immediately shut the engine down. Looked underneath the truck and there was a pond of oil about 18 inches across.

    The truck had run like a top prior to this episode on Sunday.


    Quote Originally Posted by Tins View Post
    People like John JDNSW know more about these engines than I ever will and can answer that specific, but the principle is the same. You may find it's as simple as a blocked or incorrectly installed flame trap (603330 in the pic). I don't know about the 2.6, but some engines have a one way valve. If that is installed the wrong way it's the same as being blocked.

    Screenshot 2023-03-08 at 10.10.24 am.png

  8. #8
    Join Date
    Sep 2010
    Location
    The Hills.
    Posts
    15,795
    Total Downloaded
    0
    Quote Originally Posted by matthamilton View Post

    Pulled the truck forward to drive it back in the garage. Got out to make sure it was aligned (small garage) and noticed a drip from the bell housing area. Then pulled it in and noticed the oil pressure was dropping quickly. Immediately shut the engine down. Looked underneath the truck and there was a pond of oil about 18 inches across.

    .
    Doesn't sound like CCV to me then. Is there an oil gallery welch ( "frost" to you ) plug in there somewhere?
    ​JayTee

    Nullus Anxietus

    ​Getting involved in discussions is the best way to learn.

    2000 D2 TD5 Auto: Tins
    1994 D1 300TDi Manual: Dave
    1980 SIII Petrol Tray: Doris
    OKApotamus #74
    Nanocom, D2 TD5 only.

  9. #9
    Join Date
    Oct 2017
    Location
    Nashville, TN USA
    Posts
    70
    Total Downloaded
    0
    this truck also had an fuel emission evaporation system on it that ran fumes through a charcoal canister and it was connected via hose to the intake manifold. I plugged that opening on the intake manifold but I can’t fathom that plugging that hole made a difference since the greatest volume of air would be coming through the air filter.

    as far as frost plugs, I’m not sure what you mean by the oil galley Welch?

    There was some weeping around the crankcase ventilation plumbing coming from the crankcase and venting back into the air intake. It appeared to have leaked around that seal ever so slightly and it makes me wonder if that was from the pressure as well. The block is freshly painted so I can notice fresh leaks.



    Quote Originally Posted by Tins View Post
    Doesn't sound like CCV to me then. Is there an oil gallery welch ( "frost" to you ) plug in there somewhere?

  10. #10
    Join Date
    Sep 2010
    Location
    The Hills.
    Posts
    15,795
    Total Downloaded
    0
    Quote Originally Posted by matthamilton View Post
    as far as frost plugs, I’m not sure what you mean by the oil galley Welch?
    Oil gallery.. Oils is channelled around in the block through them. A Welch plug is used to blank holes made in the casting process. Mostly used in the cooling jacket, but not unheard of in the oil system.. I'm just speculating here though, as it seems like a fair old leak you have. Hard to imagine it's the seal unless it's been pushed right out. As I say, though, the 2.6 ain't all that familiar to me.

    IMG_3712.jpg
    ​JayTee

    Nullus Anxietus

    ​Getting involved in discussions is the best way to learn.

    2000 D2 TD5 Auto: Tins
    1994 D1 300TDi Manual: Dave
    1980 SIII Petrol Tray: Doris
    OKApotamus #74
    Nanocom, D2 TD5 only.

Page 1 of 5 123 ... LastLast

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
  •  
Search AULRO.com ONLY!
Search All the Web!