oil buzzer

Post by **toomanytoys** » 18 Dec 2007, 21:56

Er... if you have changed the pressure sensors and its still doing it.. I would check the actual oil pressure... the high low pressure warning switch has to be earthed (on a wbx) to stop the buzzer coming on... the low low pressure switch wont come on until its really too late.....!!!

Coolant temperature has little efect on the oil temp/pressure.. wbx are quite poor for control over pressure when the oil is hot...

Post by **dave friday** » 18 Dec 2007, 22:06

Pete,the info i have for the Diesel [1600td] is .3 bar [low pressure switch normaly closed] .9 bar[ high pressure switch normaly open].so if you can check that you have the correct high .9 bar switch [on the filter housing] it would be a start to curing the problem.Checking the oil pressure would be a good idea .
Good luck.

Post by **HarryMann** » 21 Dec 2007, 22:44

Are the GSF switches to blame? It's the one on the oil pump that feeds the buzzer. It was a light grey one, now is a beige colour.

he pressure is stamped on those switches, very fine but with a magnifying glass and good light you should be able to see it...

Like as not, a lot of those above have low oil pressure when hot... it's a VW thing (it seems)

New oil pump won't usually make a busting lot of difference, although on the diesels an fit the larger one (30mm long gears), Shadek

https://club8090.co.uk/wiki/Pa ... k_Oil_pump

Post by **Pete Nice** » 21 Dec 2007, 23:12

I have checked the parts & the numbers appear to be right. It looks like the switch on the filter housing is the one causing the trouble.

I did an oil change to be sure it wasn't that. It had had an oil change a few weeks before, so I am guessing the last owner was trying to fix the same problem.

I think the guage pod & wiring are fine according to the official workshop manual.

I will try to buy a screw in pressure guage tomo & see what it's reading when hot.

Do you think the engine is kippered & I have bought a pup?

Post by **dave friday** » 22 Dec 2007, 00:23

The oil light on my van used to come on at tick over when the oil was realy hot[low pressure switch .6 bar] but would go out after a few seconds[at tick over].
after new bearings[bigend+ main+ new oil pump] it stays out!.
My low pressure switch is a vdo dual one[oil light+oil pressure guage sender.
Merry Christmas.

Post by **HarryMann** » 22 Dec 2007, 10:42

I have checked the parts & the numbers appear to be right. It looks like the switch on the filter housing is the one causing the trouble.

https://club8090.co.uk/wiki/Al ... and_causes

Grey/buff 0.9, the black one is about 1.4bar and was IIRC, discontinued for the diesels...

Changing the big-end shells and pump on my diesel made as good as no difference. But when I rebuilt the engine, new mains, thrusts, big-end shells, Shadek pump (and a new cylinder head - cracked head overheats the oil) brought the situation under control, although I have a small rear mounted oil cooler now that must help a bit. Oil temp still goes up to 130C when pushing hard, so am using FUCHS' fully synth from GSF and putting another cooler on, a separate water radiator for the oil heat-exchanger - thinking that should help a lot.. ?

Have also fitted the fatter but shorter T4 oil filter, to reduce overhang length off the housing, having a sandwich plate fitted for oil cooler...

Over-filling will often bring the oil pressure buzzer on when slowing and cornering after a fast dash... keep level spot-on or just under the true 4.5 litre mark.

Also, diesels put less heat into water at oil and low rpm than a petrol and more at high revs... so keeping revs below about 3800rpm helps. An intercooler on a TD can also help a bit... and the turbo of course puts a lot of heat into oil, proved recently when a fellow Syncronut put the oil temp sender in the sump near the turbo return-line outlet. 130C no problem...

If the turbo seals and bearings are not in good condition, I suspect that also would increase the amount of heat being dumped into the oil...

Post by **Pete Nice** » 22 Dec 2007, 13:22

I have ordered a oil pressure testing kit, it will be here on Thursday. I will run it hot till the buzzer comes on, then do a pressure test.

If it is low pressure then the van will have to go! I have 5 VW's at the mo & I am not going to rebuild or replace the engine...

Post by **Pete Nice** » 22 Dec 2007, 16:37

Right, I think it must be low oil pressure as the engine is knocking like hell now & stinks in the cab!

It sounds like it has knocked a big end out.

So if anyone wants a cheap van & fancies fitting another engine, let me know!

I will look out for another lump in the mean time...

Post by **dave friday** » 22 Dec 2007, 17:47

Pete,sorry to hear that,on another point i've just mesured my old pumps gears[32.25 mm diameter/36 mm long pn 068 115 153a], i thought that the gears were smaller?.

Post by **Pete Nice** » 22 Dec 2007, 18:09

I don't think I am going to get into the inner workings of this engine. i will look for another unit just to chuck in it.

I bought the van as a temporary toy for the winter & was intending selling it in the spring anyway.

I have 3 air cooled projects to sort out & that's really what I do. I would rather spend my time getting them sorted than rebuilding an engine on a van I am not going to keep.

I have been lucky with cars over the last few years but it seems I was caught out with this one. A few things didn't seem right when I road tested it. I should have walked away. I have sorted nearly all of the faults that were on it now so it's nearly there.

I have never had a diesel engine out before so I dunno what lies ahead. If someone was willing to pay £2500 for it as it is with 12 months mot then I would let it go. If not I will just dive in & change it.