It's BIG, Yellow and digs holes! JCB 3CX Project 8 is joining the Tractor Shed

The Craftmans Shop > New from Old

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awemawson:
So no putting it off any longer - time to change the oil !

First I replaced the oil pressure switch (*) and proved that it worked, then left her warming up for a bit, then actually draining out the old oil wasn't too bad - most went in the bucket :bang: Once it stopped dripping I attacked the oil filter - this is the bit I wasn't looking forward to as it's in an amazingly awkward place to get at - has to be from underneath.

Old diesel engine oil is remarkably good at marking anything within ten foot! The filter is pretty well horizontal, you have to be under it to undo it - well you get the picture :bugeye:

Anyway it's done and so far no leaks :thumbup:

(* I'd thought that there was an issue with an o/c wire in the instrument harness, but eventually a few days back proved the fault to the actual oil pressure switch)

WeldingRod:
That reminds of my Honda! But with more room and a bigger filter ;-)

Sent from my SM-G892A using Tapatalk

awemawson:
I may have mentioned that I had had the Operators Manual printed from my PDF on nice heavy 100 GSM paper and was so impressed that I decided to have the Service Manual also printed on thicker paper.

Well it arrived the other day but WASN'T on 100 GSM paper but something considerably thinner which was easily apparent to the touch. Well they weren't having any of it until I called their bluff with a micrometer :clap:

First print run 122 micron paper, this print run 105 - they obviously didn't expect an Engineer at this end of the discussion :lol:

Then I really made their day pointing out that they were fiddling their courier sending me a 1 kg return label for a 2.75 kg parcel.

Anyway it's off back to them tomorrow to reprint - I fully understand why they wan't the first version back . . but it ain't me fiddling !!!

awemawson:
Today's job - replace the diesel filter and clean out the sediment bowl.

I wasn't looking forward to this expecting trouble bleeding the system of air afterwards, especially as the lift pump is on the other side of the engine from the filter and sediment bowl.

First I removed the sediment bowl - it was full of all sorts of muck - and when it came off the 'swirl funnel' detached and for the life of me I cannot see what is supposed to hold it up against the top of the fitting. Anyway I gave it a good clean out and rinse in clean diesel and started scratching my head. The swirl funnel doesn't seem to be available as an individual part, and the whole sediment bowl second hand is £75 so ingenuity was called for. Very careful examination revealed no broken edges - I suspect that it relies on the "springyness" of the plastic that it's made from to clip onto features round the inlet and outlet pipes but the plastic is 25 years old and not springy.

Obvious answer - a suitably long weak spring to push up from the bowl itself under the funnel and keep it in contact where it should be, and the collection of random springs that I keep kindly provided a suitable candidate :thumbup:

So putting everything back together time to do the priming. Odd set up - no bleed screws - the procedure is to turn on the ignition to open the fuel solenoid, and hand pump the lift pump lever for two minutes, and amazingly it works!

I did actually have an issue getting the new filter to seal in it's housing - significant leak first time - but a bit of jiggling the sealing ring round a bit has (I hope) cured it.

awemawson:
Not a lot of progress as I'm 'waiting for things' but this morning I thought that I'd knuckle down and try and trace the wiring for the cab interior light, and the warning buzzer.

Warning buzzer was EASY - it isn't sounding as it isn't there :lol: It's the same format as the plug in relays and I bet someone unplugged it when the oil pressure switch failed. Quite clever really, all the various pressure and temperature sensors feed into a multi-input diode logic OR gate the output of which brings up a big red warning triangle on the dash, and sounds the buzzer - well it would if it was there ! Replacement on order.

I totally failed to trace the Cab interior wiring issue. The light should have ground (battery -ve) on one side (it does), and a permanent live feed via fuse A7. Measuring at fuse A7 it has no live feed but in looking into how it is fed I find on the circuit diagram it is via "Fuse Link 7" . Now nowhere is there reference to fuse links as opposed to fuses, the fuses are designated A1 though A9, B1 though B9 and C1 through C9 and have a different circuit symbol to the Fuse Links (Which are drawn as a resistor zig-zag line)

Incidentally, the (not working) radio which is fused by 'A8' is ALSO fed from 'fuse link 7' so it probably IS the problem if I can only find it!)

Trying to trace it using a Tempo tone tracer the only place it turned up was on the steering column right hand stork that controls full or dipped headlights !

. . . .so it remains a mystery :bang:

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