lsdweb
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| posted on 12/5/07 at 07:52 PM |
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Spa Dual Gauge Playing Silly Bu**ers
Hi All
I've got a Spa dual gauge - Oil pressure / Oil Temperature and it's been fine up until Thursday on the rolling road, when the wiring to
the oil temperature sensor got a little hot! The temperature is showing 162 degrees C even when the engine is stone cold. I've tried to see if
there is any damage to the cabling by stripping the insulation and shielding cables back. Now my oil pressure reading is stuck on 1.9 psi even with
the engine running!
This has caused me to miss tomorrow's hill climb as I can't chance running without an oil pressure gauge (and this runs the warning light
as well!).
Any thoughts?
I'm going to try and disconenct the oil temperature sender at the gauge end later just to see if this is affecting the pressure readings.
Wyn
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nitram38
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| posted on 12/5/07 at 07:53 PM |
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That is why I run a capilary type.
The only solution is a new capilary gauge or replace the senders as they sound as if they are fried.
You can prove it by connecting the wires through different resistances and checking the readings or putting the cable end to earth, but do this bit
at your own risk!
[Edited on 12/5/2007 by nitram38]
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Agriv8
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| posted on 12/5/07 at 08:13 PM |
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Sounds like fried wireing to me.
depending how hard it is to get to could you run temporary wires to your senders and disconect the original ones and see what your gauge says.
Regards
Agriv8
Taller than your average Guy !
Management is like a tree of monkeys. - Those at the top look down and see a tree full of smiling faces. BUT Those at the bottom look up and see a
tree full of a*seholes .............
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lsdweb
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| posted on 12/5/07 at 08:22 PM |
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I was thinking of running new wiring but can't work out why the pressure side of things has gone wrong, as this is definitely not damaged and
runs totally separately from the temperature wiring.
The only other thing I can think of is that the car got pretty damp in the trailer yesterday and maybe the pressure wiring connector is damp although
having two separate faults is unlikely!
I’ll try disconnecting the temperature wiring from the gauge before hacking the loom apart!
Wyn
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blakep82
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| posted on 12/5/07 at 08:32 PM |
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i can only assume, and admittely no definite answer, but could the fired wiring have some effect on the resistance of the wire? this would affect the
voltage to the guage i guess, but i don't know how guages work i know you plug them in and they (usually) do
just an idea for you though
________________________
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don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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nitram38
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| posted on 12/5/07 at 09:15 PM |
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Do the gauges move at all?
Maybe they were shorted out?
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lsdweb
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| posted on 12/5/07 at 09:20 PM |
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They're a digital gauage so no actual movement but the they do work and go through all the startup tests etc all ok and this is what makes me
think it's the loom!
The gauge comes with its own loom but this is inside the trunking that runs from the dash back to the engine. I need to reroute the cables to the
sensors anyway (further away from the exhaust manifold !!) so stripping out the cables and soldering in new bits won't be too difficult if I
have to do it.
Wyn
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nitram38
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| posted on 12/5/07 at 09:31 PM |
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Sounds like the gauges are ok, maybe some of the cables fused together?
Wyn, talking of Manifolds, I am still trying to get mine made!
Your contact in Wales said I had to bring the engine.......too far.
Mac 1 said the would get an 05 engine off Malc at Yorkshire engines to build on.........no more heard from them and Martin Keenan doesn't seem
to have enough time to brush his teeth let alone make an exhaust! (Chris Mason has been trying to get him to make one for me).
I'm not desperate, just collecting parts for now.
I should be able to start my chassis the week after next, now I have got another garage for the F1-2.
I will need the exhaust to space the engine on the chassis and hence the rear wheels etc.
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Agriv8
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| posted on 12/5/07 at 10:01 PM |
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can you check you wireing ( or senders )with a multimeter and see what resistance you are getting ( ohms ) this should tell tou if the wires are fused
together
regards
Agriv8
Taller than your average Guy !
Management is like a tree of monkeys. - Those at the top look down and see a tree full of smiling faces. BUT Those at the bottom look up and see a
tree full of a*seholes .............
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nitram38
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| posted on 12/5/07 at 10:12 PM |
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quote:
Originally posted by chris mason
OT,
Martin, your manifold!!! it's looking good for this week, i'll keep you posted, all being well you should have it by this time next week
Chris
I haven't got any money ! 
Just kidding.........it's burning a hole in my pocket though!
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lsdweb
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| posted on 18/5/07 at 09:56 PM |
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Fixed it!
Hi Guys
I've got it sorted. I phoned SPA - very helpful - they said send the gauge and sensors back and they'd test them - also said the loom
doesn't like any heat! As my next (first!) event is in a fortnight I couldn't take the chance, so, i put the multimeter on the loom
tonight and it wasn't right! I stripped away at it and found the wiring to the oil pressure sensor had gone all brittle - shortened it -
reconnected it (the sensor fittings are only screw connectors) and tried it out and both displays are reading sensibly. I can't fire it up
because I'll wake Junior and it's taken me hours to get him to sleep! I'll try it in the morning but I'm confident it's
fine now. I just need to reroute the loom to take it further away from the manifold.
Result!
Wyn
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