TD5 blowby?





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    Exclamation TD5 blowby?

    Hey everyone.

    I overheated my '99 110 Td5 in December, and have done about 5000km on it since then. I was very concerned about head gasket failure so yesterday I went for a chemical test and trues Bob, the head gasket is gone. During the general engine checks they noticed blow-by coming from the dipstick tube, see video here https://we.tl/t-4a8DF1ffs9. The video explains it a lot better than I can.

    It was recommended that I do a complete engine rebuild, new pistons, valves, bearings etc whilst I replace the head-gasket and get the head skimmed. But can someone please explain to me what exactly is going wrong here? It's my understanding that a particular piston/s aren't true anymore and there has been some wear in the bores allowing combustible gasses to enter the sump...? If so do I NEED to replace everything, or just the pistons in question? I understand that I have to get the bores sent off and measured, compression checked etc as well...?

    I would like to do the rebuild myself, especially now in lockdown as I have the time but I want to know what I am fully in for before I take on this mammoth task. If anyone has experience with this or has recently done this task please let me know there thought please. Quite apprehensive for doing this and it obviously involves a lot of money, just want to get my ducks in a row.
    Thanks.
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    Default Re: TD5 blowby?

    My only advice is don't do half a job. Do it all, do it properly, and use a proper Landie workshop, not some general guy on the corner. The TD5 is not your average Jap TDi.
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    Default Re: TD5 blowby?

    What is the mileage on your Td5?
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    Default Re: TD5 blowby?

    You can get a blowback through the dipstick if your "oilcooler"" develops a leak . (I think it is the oil cooler or some cooler) . This happened to me and luckily my mechanic checked it and saved me a rebuild. A very easy fix.

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    Default Re: TD5 blowby?

    Quote Originally Posted by Fontuin View Post
    What is the mileage on your Td5?
    196,942km


    Quote Originally Posted by Hylton View Post
    You can get a blowback through the dipstick if your "oilcooler"" develops a leak . (I think it is the oil cooler or some cooler) . This happened to me and luckily my mechanic checked it and saved me a rebuild. A very easy fix.
    Very interesting. This could save me so much, thank you.

    I could do a compression test however the mechanic was worried about breaking the glow plugs into the engine, and the test can only be 80% accurate as it only tests 4 of 5 cylinders. But probably worth getting the compression test done to be sure.

    I agree with not doing a half job, want the engine to last a long time. Just weighing up options and peoples opinions
    Last edited by saffaoverland; 2020/05/08 at 03:37 PM.
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    Default Re: TD5 blowby?

    Quote Originally Posted by Hylton View Post
    You can get a blowback through the dipstick if your "oilcooler"" develops a leak . (I think it is the oil cooler or some cooler) . This happened to me and luckily my mechanic checked it and saved me a rebuild. A very easy fix.
    Sorry, can you explain this a bit more. Don't see how the oil cooler can cause blowback.
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    Default Re: TD5 blowby?

    Quote Originally Posted by saffaoverland View Post
    Sorry, can you explain this a bit more. Don't see how the oil cooler can cause blowback.
    me neither
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    Default Re: TD5 blowby?

    Could a cracked head cause blow back?
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    Default Re: TD5 blowby?

    When a td5 blows a head-gasket it almost always damages the head (which cannot be skimmed).

    I am truly sorry to hear about your landy especially since a td5 needs to be done properly without shortcuts. You will have a better engine if done right, I most certainly do. Ive done about 50 000kms since my rebuild with heavy towing and off-road. My advice is as follows.

    -new AMC head
    -new head bolts
    -steel locating head dowels
    -delete egr if not yet done
    -upgraded oil cooler (or at least new o-rings)
    -nee injector washers and o-rings (make sure injectors are coded correctly and ONLY use genuine o-rings and washers)
    -get bottom end inspected by the engineers who do engines for Lrxtreme or overlandworx
    -new rings after cylinder honing
    -new pistons
    -new injector harness(cheep insurance for oil in ecu)
    -deweb + skim exhaust manifold and fit wurth studs and nuts
    -new diesel filter, oil filters (both), air filter and a 15w40 oil for the first 1500km, then after 5000km change to either 10w40 or 5w40
    -new valve seals
    -the thermostat and waterpump
    -flush radiator and intercooler
    -new fanbelt
    -have a look at the crank seals and clutch while the engine is out

    I would also very strongly recommend a EMS with egr and coolant monitoring, upgraded intercooler and centre silencer removal.

    The break in period is also pretty important, the engine needs to run at various loads and speeds. IOW it needs to be worked without racing it, gradually increasing load and speed.


    Obviously this is a costly exercise and only worth it if you plan on keeping the landy for a good few years.
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    Default Re: TD5 blowby?

    Like I said. Find a good indie, you don't do TD5 without experience.
    Quote Originally Posted by pjf110 View Post
    When a td5 blows a head-gasket it almost always damages the head (which cannot be skimmed).

    I am truly sorry to hear about your landy especially since a td5 needs to be done properly without shortcuts. You will have a better engine if done right, I most certainly do. Ive done about 50 000kms since my rebuild with heavy towing and off-road. My advice is as follows.

    -new AMC head
    -new head bolts
    -steel locating head dowels
    -delete egr if not yet done
    -upgraded oil cooler (or at least new o-rings)
    -nee injector washers and o-rings (make sure injectors are coded correctly and ONLY use genuine o-rings and washers)
    -get bottom end inspected by the engineers who do engines for Lrxtreme or overlandworx
    -new rings after cylinder honing
    -new pistons
    -new injector harness(cheep insurance for oil in ecu)
    -deweb + skim exhaust manifold and fit wurth studs and nuts
    -new diesel filter, oil filters (both), air filter and a 15w40 oil for the first 1500km, then after 5000km change to either 10w40 or 5w40
    -new valve seals
    -the thermostat and waterpump
    -flush radiator and intercooler
    -new fanbelt
    -have a look at the crank seals and clutch while the engine is out

    I would also very strongly recommend a EMS with egr and coolant monitoring, upgraded intercooler and centre silencer removal.

    The break in period is also pretty important, the engine needs to run at various loads and speeds. IOW it needs to be worked without racing it, gradually increasing load and speed.


    Obviously this is a costly exercise and only worth it if you plan on keeping the landy for a good few years.
    2012 Jeep Sahara Unlimited 3.6 V6
    Percivamus

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    Default Re: TD5 blowby?

    If you're going to go the whole hog, might as well get a new oil pump as well...

    You're looking at a good R60k to do the job with new head, oil pump etc

    The head can be skimmed, lrxtreme will know who does it.

    You're also going to need new timing chain kit + guides, use genuine only.

    Frankly, I'd get it done by the professionals, R60k spend without a warranty is not worth the risk..

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    Default Re: TD5 blowby?

    If I was in your position I'd take the vehicle to Peter and his guys at Overland Worx. Have them do proper fault finding and your repair options. The end of last year the auto gearbox on my Disco 2 Td5 failed. I was quoted anywhere above R40k for repairs to the gearbox. Peter did the job for R12K and they fixed some other issues while it was there. They are a very professional team. From what I have read about the Td5 motor, it's not a good idea to tackle a rebuild unless you have a all the specialist tooling and knowledge to do the job. Apparently there are many "tricks" to a successful rebuild of a Td5 motor.
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    Default Re: TD5 blowby?

    Quote Originally Posted by saffaoverland View Post
    196,942km
    That's low mileage for a Td5 to require a rebuild.

    My previous Td5 had a mileage of 390 000 km, the engine was opened as a precaution due to another failure. It still had the factory hone marks in the cylinders. No legible wear.

    My current Td5 has 240 000 km on the clock and it doesn't use a drop of oil.

    Get a second opinion, I'd go to LRXtreme.
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    Default Re: TD5 blowby?

    Quote Originally Posted by saffaoverland View Post
    Sorry, can you explain this a bit more. Don't see how the oil cooler can cause blowback.
    Not really. I am not a mechanic but there is a cooler that corrodes inside the coolant system. When it develops a small leak it puts oil in the coolant system and obviously pressurises the coolant system causing blowback. That is about the best I can do

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    Default Re: TD5 blowby?

    Quote Originally Posted by jelo View Post
    me neither
    This is a first for me.

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    Default Re: TD5 blowby?

    Quote Originally Posted by saffaoverland View Post
    Sorry, can you explain this a bit more. Don't see how the oil cooler can cause blowback.
    If you overhaul your engine, replace the oil cooler. Preferably with an after market one. The Td5's oil cooler is manufactured from some material with a quality akin to old baked bean tins. If one does not use a good quality anti freeze it WILL go tits-up at some stage - and often even if you do use anti freeze.

    If an oil cooler packs up, the engine's compression forces the oil into the cooling system - which causes the engine to blow UP, not blow BACK.

    Getting that oil out of the cooling system will cause you to develop a new vocabulary and you will probably have to replace all the rubber pipes - been there, done that.
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    Default Re: TD5 blowby?

    Quote Originally Posted by Hylton View Post
    Not really. I am not a mechanic but there is a cooler that corrodes inside the coolant system. When it develops a small leak it puts oil in the coolant system and obviously pressurises the coolant system causing blowback. That is about the best I can do
    If there is a leak in the cooler the fluid transfer will be from the system with the higher pressure to the lower so you should get oil in the cooling fluid. When oil is mixed with the water/coolant it will become a grey to brown foaming mess that you will see on the dipstick and in the oil cap. If you are seeing any signs of oil and water being mixed, I doubt the problem was correctly diagnosed. That is why I and others have suggested that you get a second opinion from a reputable workshop before you spend a lot of money for nothing.
    The humble person makes room for progress; the arrogant person believes they’re already there.
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    Default Re: TD5 blowby?

    Quote Originally Posted by EttiennedK View Post
    If you overhaul your engine, replace the oil cooler. Preferably with an after market one. The Td5's oil cooler is manufactured from some material with a quality akin to old baked bean tins. If one does not use a good quality anti freeze it WILL go tits-up at some stage - and often even if you do use anti freeze.

    If an oil cooler packs up, the engine's compression forces the oil into the cooling system - which causes the engine to blow UP, not blow BACK.

    Getting that oil out of the cooling system will cause you to develop a new vocabulary and you will probably have to replace all the rubber pipes - been there, done that.
    Thanks. I knew somebody could explain better than me. I also had to replace all the pipes. I forgot about that. My engine was fine after replacing by the way. The oil cooler corroded and leaked it did not fail.

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    Default Re: TD5 blowby?

    Thanks for your advice guys. Will contact overlandworx/landyworx when they are open. I am starting to agree that I would rather leave the job to the professionals haha.


    Quote Originally Posted by Fontuin View Post
    That's low mileage for a Td5 to require a rebuild.

    My previous Td5 had a mileage of 390 000 km, the engine was opened as a precaution due to another failure. It still had the factory hone marks in the cylinders. No legible wear.

    My current Td5 has 240 000 km on the clock and it doesn't use a drop of oil.

    Get a second opinion, I'd go to LRXtreme.
    Yes but because I overheated it's caused damaged to the internals.
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    Default Re: TD5 blowby?

    Quote Originally Posted by EttiennedK View Post
    If you overhaul your engine, replace the oil cooler. Preferably with an after market one. The Td5's oil cooler is manufactured from some material with a quality akin to old baked bean tins. If one does not use a good quality anti freeze it WILL go tits-up at some stage - and often even if you do use anti freeze.

    If an oil cooler packs up, the engine's compression forces the oil into the cooling system - which causes the engine to blow UP, not blow BACK.

    Getting that oil out of the cooling system will cause you to develop a new vocabulary and you will probably have to replace all the rubber pipes - been there, done that.
    Quote Originally Posted by Paul#25 View Post
    If there is a leak in the cooler the fluid transfer will be from the system with the higher pressure to the lower so you should get oil in the cooling fluid. When oil is mixed with the water/coolant it will become a grey to brown foaming mess that you will see on the dipstick and in the oil cap. If you are seeing any signs of oil and water being mixed, I doubt the problem was correctly diagnosed. That is why I and others have suggested that you get a second opinion from a reputable workshop before you spend a lot of money for nothing.
    I am not getting any oil in my water, or vice se versa... so I don't think the oil cooler is the culprit for this. But yes will definitely be getting a second opinion from a reputable garage. They also did a pressure test on the coolant system and found no leaks.

    Could the injector seals/washers cause blow up?

    I just took it for another drive, definitely no blow up when engine is cold, only when hot. Took off the oil filler cap and balanced it on the hole, and it didn't jump around, which means the pressure/amount of blow by is small but would still rather sort it out.
    Last edited by saffaoverland; 2020/05/09 at 10:34 AM.
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