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  • Diesel Leaking Into Oil

    As I type, my MY10 diesel NT is on the back of a truck heading for the Mitsubishi dealer in Mackay.

    My wife was travelling to Townsville when she had problems with lack of power and lots of smoke when putting the foot down. RACQ found the sump had a fair quantity of diesel in it. I didn't like the chances of getting a proper fix at Carmila so got it sent to Mackay.

    Recently had a 90000 service (good local mechanic) which also included EGR block, manifold clean and valve adjustment. New injector seals were used. So the likely cause is in this area - have to wait and see what the final diagnosis is.

    Like to hear from anybody who has had this problem, or any useful suggestions. The vehicle has probably done about 1000kms since the service. Best guess is it won't cause any engine damage.

    Thanks
    Graham
    - - - - - -
    2010 NT GL Auto DiD- OL Bull Bar, Avenger (Kingone) 9500lb winch, Tow Bar, Rhino rack bars with old rack on top when needed. GME UHF radio, Dual battery system (home made tray, Enerdrive isolator, dual voltmeter), s/steel water tank in 3rd seat storage area, rear storage (home made), Narva lights, 50mm suspension lift (Kings springs, OzTec shocks), Masten TPMS, Bushskinz underbody protection and sliders, 3" exhaust, EGR block, Scangauge, Toyo A/T II tyres, Airtec snorkel

  • #2
    as you know the fuel injectors pump fuel directly into each of the cylinder dome areas and for any fuel you get into the engines oil cavities / sump could be an issue with something more like a blown head gasket . lets just hope it is something alot easier to fix as you mentioned but be prepared.
    NS 3.2 Diesel, Polor White , Black CSA Rims, HanKook Dynapro AT Tyres, 3 inch custom stainless steel exhaust with free flow Cat & Muffler, 50mm Lift, Old Man Emu Shocks and Springs, TJM Bullbar powder coated White, Custom 7mm Sump Guard & Transmission Guard, 8 inch LED Spotties plus 20 inch LED Light Bar, rear Reverse LED Light, ARB Roof Cage , Tiger11 Awning.

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    • #3
      As the injector lines from the common rail pass through the rocker cover and connect to the injectors inside the rocker cover, this is highly likely to be where your leak is coming from.
      Should be a relatively simple fix.
      I would be doing a couple of oil changes in quick succession after the leak is repaired, to make sure you have removed all diesel contamination from the oil system.
      Cheers, Dan.
      2004 NP DiD GLX, 5 spd Manual with SMF, ARB Bullbar, Ironman 12000lb winch, Lightforce Genesis lights, Airtec Snorkel, 81L LRA tank, Unifilter, GME 3500 UHF, Redarc elec brake controller, ARB dual Batt tray with 60AH Deep cycle Batt & Redarc Isolator, Bushskinz Sliders, intercooler and sump guards, Lovells raised HD springs, Polyairs & Bilstein shocks, Milford Cargo Barrier, Philips +100 globes, 2nd set of rims with 245/75x16 Bighorns, Waeco 60L Fridge & a Cavalier camper trailer!

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      • #4
        Injector or injector line is most likely. Easy fix as Dan says. Hope no damage was done to the engine running in diesel not oil.
        .Previously an NP GLX 3.8 auto RIP
        NS VRX DiD auto. RIP.

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        • #5
          As everyone has said most likely not put back together properly after the valve adjustment. On a positive side with all that diesel in the oil its probably given the oil system a bit of a cleanup

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          • #6
            Will be a dodgy injector seal. These seals are what give the 3.0 Toyota D4D engines so much trouble, causing the engines to lock up as the fuel and carbon ends up in the sump, and the carbon clogs the oil pick up.
            Cheers, Bundy.

            Currently: 2001 NM GLS MY2002 3.5 V6 Manual, Bullbar, GME TX3520, Falken Wildpeak A/T02 LT265/70/16, Pacemaker extractors, KYB Skorched 4's, Villain Lighting 22" lightbar, Bushskinz Front and sump guard, Pioneer 7" screen

            Items to be fitted: ARB 2.5 x 2.1 awning.

            Items to be purchased: Bushskinz- Gearbox/Transfer plates and sliders, Roof racks, Safari Snorkel, Lifted Springs, maybe more...

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            • #7
              Originally posted by Widgeeman View Post
              As I type, my MY10 diesel NT is on the back of a truck heading for the Mitsubishi dealer in Mackay.

              My wife was travelling to Townsville when she had problems with lack of power and lots of smoke when putting the foot down. RACQ found the sump had a fair quantity of diesel in it. I didn't like the chances of getting a proper fix at Carmila so got it sent to Mackay.

              Recently had a 90000 service (good local mechanic) which also included EGR block, manifold clean and valve adjustment. New injector seals were used. So the likely cause is in this area - have to wait and see what the final diagnosis is.

              Like to hear from anybody who has had this problem, or any useful suggestions. The vehicle has probably done about 1000kms since the service. Best guess is it won't cause any engine damage.

              Thanks
              My J-top was doing that when I bought it cheap, & was due to a broken inlet-rocker. No compression in #2cyl. meant unburnt fuel exiting exhaust & washing down past rings & slowly over-filling sump. Can be result of poor valve-adjustment causing valve-bounce.
              Steve

              Runner-Paj; '95 NJ SWB 2.5L TD GL J-Top, low kms Project-Paj; '92 NH SWB 3.0L V6 GLS Hardtop Triple-pack, also low kms. Donor Paj; '92 NH SWB 3.0L V6 GLS Hardtop Triple-pack, with some parts & goodies to go onto other GLS.
              "I try to take life one day at a time, but sometimes several days attack me all at once!"

              Comment


              • #8
                and on Nissan 4.2 diesels, its the main seal in the injector pump. sounds like an interesting investigation.
                2005 MK Triton GLS 2.8TD manual, some fruit, much more to come.
                retired .. '94 NJ, GLS, swb, 3.0l

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                • #9
                  Final Outcome

                  Well the wife is back on the road again.

                  Only damage was to the wallet - $900. Haven't seen the bill, but new injector lines and seals, plus oil and labour. Strangely (I thought) no new oil filter - just drained it overnight. Head mechanic said all OK until next scheduled service - no need for additional oil or filter change.

                  It seems the lines were overtightened, therefore didn't seal properly. The mechanic said they were fiddly to get right and needed correct torque. Also pressure testing to ensure no leaks, which was done after the repair.

                  Lesson learned - use dealer for the specialist jobs. (Now, what does that cover?)

                  Cheers
                  Graham
                  - - - - - -
                  2010 NT GL Auto DiD- OL Bull Bar, Avenger (Kingone) 9500lb winch, Tow Bar, Rhino rack bars with old rack on top when needed. GME UHF radio, Dual battery system (home made tray, Enerdrive isolator, dual voltmeter), s/steel water tank in 3rd seat storage area, rear storage (home made), Narva lights, 50mm suspension lift (Kings springs, OzTec shocks), Masten TPMS, Bushskinz underbody protection and sliders, 3" exhaust, EGR block, Scangauge, Toyo A/T II tyres, Airtec snorkel

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                  • #10
                    have you had a chat to the local mech.
                    I would want him to stump for the repair.

                    good to hear it went ok with no major probs.

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                    • #11
                      Lesson learned - use dealer for the specialist jobs. (Now, what does that cover?)

                      Not really mate but you do need to find a decent mechanic. Many on here have done their own tappets or manifold clean without drama.

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                      • #12
                        With all that diesel in the oil it is a good thing the inlet throttle body butterfly hasn't been removed or you could be looking at a costly engine runaway.
                        Peter

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                        • #13
                          Hi All,
                          I had exactly the same thing happen to my NT - lots of smoke and shocking rattle. Car flat-topped to MM dealer - found 18 litres of oil/diesel mix in sump. Took some time and a call to tech advice centre at MMA to locate a faulty washer on one of the injector pipes inside the cam cover. Based on the advice from MMA, I think the problem is known to them - they were able to direct the dealer straight to the problem area. All was fixed at no charge under warranty.
                          Richard.

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                          • #14
                            This is interesting thread and I'd like any updated advice pls I just drained 16lt of oil/diesel out of my sump I'm probably to fault if the reason is over tightening injector lines as I recently removed them to pull the intake manifold off to clean it and subsequently reinstalled injector lines, I'm extremely stressed as to damage I may of caused have only done a couple of hundred Kim's since doing this and hope the mechanic I take it to can fix it for me some lessons are learnt the hard way

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                            • #15
                              A few liters of diesel in the sump won't cause any major problems.

                              Keep in mind that DPF equipped models always accumulate diesel in the sump, as per operational design.

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