John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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
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
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).
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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.
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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
They are all the same now, the seals work for both.
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
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.
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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