Lazy screen wash on one side.

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Boosh
Joined: Sun 30 Nov, 2014 22:40
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  Z3 roadster 1.9i

Lazy screen wash on one side.

Post by Boosh » Sat 24 Oct, 2015 16:17

Hi all,
Not quite sure what's going on with my screen wash (simple system, with no headlight wash). The two jets on the driver's side just about reach the bottom of the windscreen, while the other side works fine. I therefore rule out a faulty pump. If I block the left side, the driver's side then works fine. I therefore don't think it's some crap in the pipe. If I activate the screen wash whilst the bonnet is open, then both sides work fine.
Would any of you chaps know of a trick to sort it out before I go to the breaker's to scavenge some pipe and jets?
Thanks all,

Boosh.

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Tufarlian
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  Z3 roadster 3.0i
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Re: Lazy screen wash on one side.

Post by Tufarlian » Sat 24 Oct, 2015 16:41

It's probably the jet. They have non return valve built in that has a habit of failing.

If you release the bonnet soundproofing you may well find the jet is leaking.

They are not very expensive. About £3 I think.

Mark

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Gazza
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  M roadster S54
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Re: Lazy screen wash on one side.

Post by Gazza » Sat 24 Oct, 2015 17:30

The washer pipe can be squashed when the bonnet is closed.
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gookah
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  Z3 roadster 2.8

Re: Lazy screen wash on one side.

Post by gookah » Sat 24 Oct, 2015 17:50

I think you should check the gauze filter at the bottom of the pump, Sounds like the pump is ok to supply one side only but not both. the get clocgged up and produce poor flow for the pump.
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Boosh
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  Z3 roadster 1.9i

Re: Lazy screen wash on one side.

Post by Boosh » Sat 24 Oct, 2015 19:43

Tanks, chaps,
I'll swap the jets over tomorrow and see what happens.
In case it goes to that, is the pump easy to get to?

Boosh.

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Tufarlian
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Re: Lazy screen wash on one side.

Post by Tufarlian » Sat 24 Oct, 2015 22:53

gookah wrote:I think you should check the gauze filter at the bottom of the pump, Sounds like the pump is ok to supply one side only but not both. the get clocgged up and produce poor flow for the pump.
Yes. Could be. My car's had that problem as well :-)

siwilson
Joined: Fri 19 Jun, 2009 10:54
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  M roadster S54
Location: Horley

Re: Lazy screen wash on one side.

Post by siwilson » Sun 25 Oct, 2015 08:38

Gazza wrote:The washer pipe can be squashed when the bonnet is closed.

This would be my bet as well. The washer hose is routed around the bonnet hinge and protected by what looks lie a cable management tube. This protection tube became deformed on my car causing the same symptoms you describe.

So I would check

1. The hose around the hinge for deformation
2. The washer bottle to make sure there is no crap in the filter.
3. Have the nozzle off to make sure the non return is working properly.
2001 M roadster S54 Laguna Seca Blue

Rafolian
Joined: Wed 27 Feb, 2013 08:41
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  Z3 roadster 2.8

Re: Lazy screen wash on one side.

Post by Rafolian » Sun 25 Oct, 2015 10:11

It's obviously not a filter or jet problem, as he has stated that it works fine with the bonnet open so it must a pipe getting squashed when he closes the bonnet!

Boosh
Joined: Sun 30 Nov, 2014 22:40
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  Z3 roadster 1.9i

Re: Lazy screen wash on one side.

Post by Boosh » Sun 25 Oct, 2015 11:02

I did have a quick look at the pipe and was surprised at how new it looked (I've only had the car 11 months, and it came with very little service receipts). I did yesterday have the 'lazy' jet out and blew into it from each end, without feeling any difference, so the valve inside may indeed have had it. The weather is very good today, so I'll swap the jets over and have a go at the filter mentioned in previous posts. Can I get to it from above, or do I need to jack'er up?
Thanks for the pointers, so far,

Boosh.

Boosh
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  Z3 roadster 1.9i

Re: Lazy screen wash on one side.

Post by Boosh » Sun 25 Oct, 2015 16:19

Well, those who pointed at a clogged-up screenwash filter were right. And those who pointed at a faulty pre-nozzle valve were right, too: the filter was indeed properly gunged up, but after cleaning it (as well as the bottle, of course) and reffiting it, all worked perfectly well, apart for a bad leak at the valve, under the bonnet. I took the valve out to have a looksie. It leaks from a little hole on the side where (I think) air goes in when water flows out. Put it back, and now the once-lazy side just about gets wet. So I will need to replace the valve after all. I had a look on real OEM but couldn't see whether that part is common to other BMWs. Would you Wise Men know what model I can scavenge one from, as there's a few scrappies?
Thanks for your help,

Boosh.
P.s. I didn't let that bother me: I went for a lovely roof-down drive in the Normandy countryside...

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Tufarlian
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  Z3 roadster 3.0i
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Re: Lazy screen wash on one side.

Post by Tufarlian » Mon 26 Oct, 2015 08:08

Part number 61661389040

Common to all Z3s and 3, 5 and 7 series as well

http://www.realoem.com/bmw/enUS/partxre ... 1661389040

Boosh
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  Z3 roadster 1.9i

Re: Lazy screen wash on one side.

Post by Boosh » Mon 26 Oct, 2015 12:36

Thanks,
I grab my pliers and I'm off to trhe scrappie

Boosh..

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Robert T
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  Z3 roadster 1.9
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Re: Lazy screen wash on one side.

Post by Robert T » Mon 26 Oct, 2015 12:45

I resurrected the NR-valve on mine by cleaning it. First I gave it a good soak in warm soapy water, then I blew water through it using a squeezy bottle, and then finally I dried it out with compressed air (just a portable tyre compressor). Now squirting like a good un'. If it doesn't work after that, then buy a new one.

Cheers R.
Arctic Silver '99 Z3 1.9 & Black '59 Frogeye 1275cc
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Boosh
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  Z3 roadster 1.9i

Re: Lazy screen wash on one side.

Post by Boosh » Mon 26 Oct, 2015 13:59

Thanks, I'll try that first as there's only a handful of BMWs at the breakers' near me.
Boosh.

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Tufarlian
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Re: Lazy screen wash on one side.

Post by Tufarlian » Mon 26 Oct, 2015 17:13

I'm a big fan of fixing things rather than just replacing but if it is the jet they are one of the few things are are really quite cheap and your local dealer will probably have them in stock....

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