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Thread: Marmalade the IIa

  1. #41
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    Quote Originally Posted by JDNSW View Post
    If you consider getting the head skimmed, you need to be aware that the precombustion chambers must be slightly proud of the head face.
    So probably order new hot plugs while I’m at it? (If I go down that route)
    As a side note, the hot plugs are a little cracked - which I’m lead to believe is fairly normal. When would one replace them?


    Luca

  2. #42
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    Quote Originally Posted by Ypsilophora View Post
    So probably order new hot plugs while I’m at it? (If I go down that route)
    As a side note, the hot plugs are a little cracked - which I’m lead to believe is fairly normal. When would one replace them?


    Luca
    When they look like they are going to fall to pieces. I would not worry about minor cracks. What to look for is signns they have been moving. Replace in that case. Just in case there is any confusion, we are talking about precombustion chambers, not glowplugs.
    John

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

  3. #43
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    Yes, these things

    The bearmach parts catalogue called them hotplugs - so not knowing any better that is what I have been calling them. Also heard people call them 'hot spots'. Precombustion chamber is a better name though; as it seems to literally be what they are.

    All mine seem fine, still nice and straight and don't seem to show any signs of moving (all carbon build-up marks line up).

    While I'm on the topic of engine bits and bobs - is it worth replacing injectors? From what I've read it seems they're pretty tough, and a guy nearby has a bench pop tester thing for injectors. Maybe a case of testing, rebuilding, retesting and potentially replacing?


    Luca

  4. #44
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    While you are doing all this work, it is definitely worth overhauling the injectors, although since they are easily removed after the engine is assembled, it is not essential. However, there is no advantage that I am aware of to replacing rather than overhauling the injectors. The overhaul should include replacing any parts such as nozzles that are damaged or out of spec.
    John

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

  5. #45
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    Hey John, thanks for clearing that up.

    Removed the inlet and exhaust valves, which proved that the smoke was probably from bad seals as all 8 were hard and brittle - 5 out of 8 looked to be leaking (how all 8 weren't, I guess 3 just happened to harden in a sealed position... or it hadn't been driven enough since the seals died to start leaking in all 8).
    IMG-4282.jpg
    I don't have a stem compressor, but they look like glorified clamps - so I made do; as I don't know enough about mechanics to know how much I'm screwing things up I think it worked well! (people who do know - please feel free to tell me how much of an idiot I am). Do note; I did cushion the cylinder head face with a piece of wood, which prevented the clamp from scoring it.
    IMG-4268.jpg
    IMG-4258.jpg
    IMG-4273.jpg
    nice and gummy


    The stem seals themselves seem to be two different parts - one for exhaust and one for inlet (one has a little spring around the top, the other doesn't). Yet when I look on paddocks/bearmach/craddocks etc it seems they just list 'stem seals' rather than two different types; is this all fine?

    Luca

  6. #46
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    They are all the same now, the seals work for both.

  7. #47
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    Quote Originally Posted by Cadas View Post
    They are all the same now, the seals work for both.
    Thanks heaps for that - good to know

  8. #48
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    Quote Originally Posted by gromit View Post
    Just looked at the parts manual and it doesn't show an oil scraper ring in the lower groove.
    The groove itself must collect oil and the holes let it travel back down to the sump.


    Colin
    Hi Colin, just butting into this conversation about the diesel's 5 ring pistons. The 5th oil control ring was deleted during production as it was deemed unnecessary. The later s3 diesel shop manual says not to fit it. When you buy new diesel pistons, the 5th ring groove is not there. I searched everywhere to get a set of rings for 5 ring pistons when I rebuilt my s3 diesel engine, and found a set here in Australia, but had one ring missing, of course it was an oil ring. Turns out I didn't need them anyway as one of my pistons was broken at the top ring land. And, as my luck goes, I only found it after it was the last pistons pulled out. Haha. I fitted 4 new pistons in the end. Hope this answers your question. Cheers

  9. #49
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    Also as JDNSW has said, the hot spots are slightly proud of the cylinder head face. If you machine the head face then replace the hotspots and the pins that locate them. Make sure you use a diesel head gasket as they have a special cut out thing for the hotspots to hold them in place. Cheers.

  10. #50
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    Right
    Been a while of not a lot of progress, but I am finally getting round to rebuilding the gearbox/transfer case.
    IMG_5235.jpg

    A few issues I want to iron out before bolting it all up and sticking it back in place -

    1, it seems to be stuck in 4WD (which was its issue originally) - red knob fully forward, yellow knob fully upwards seems to still have drive to the front output shaft. Not sure what the cause of that is. Obviously I can’t fit the spring to the yellow knob, so maybe that is the cause - but I can’t really see how.

    2, when in reverse the gearbox is quite noisy, sounds like a rusty bearing, odd thing is I have replaced all bearings, and before the box was bolted together each individual part was very smooth - maybe it will quieten down when full of oil?

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