Took the A4 out for a ride a couple of weeks ago. Went really well, but on return to home I saw the oil light flicker on a couple of times, but only at low revs (below 2000rpm). Anything over that, no flickering. Fitted a replacement (genuine) oil pressure switch, took it out today - same thing. Only happens once I've done 5-10 miles and engine is up to temp. No visible leaks, no smoke from exhausts.
Oil and filter change was done last month, using OEM filter and Rock Oil Gamma 10W40 mineral oil.
So, next step - sump off, or "do they all do that" ?
any advice appreciated! thanks
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flickering oil light
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There is small hole in the switch innards that tends to clog up,take the switch out and check is clear,Kwak realeased a service bulletin years back to open up this hole if i remember right sure some one will confirm,,,also would check oil strainer filter is clear..Paul J
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Not an uncommon thing!
Well worth an hours work taking off the sump & checking oil pump strainer - for peace of mind.
Modern oils do run "thinner" and at low revs when hot need less gap to flow - so a flickering light that goes off with a few more revs is not always a BAD sign.
Well worth an hours work taking off the sump & checking oil pump strainer - for peace of mind.
Modern oils do run "thinner" and at low revs when hot need less gap to flow - so a flickering light that goes off with a few more revs is not always a BAD sign.
And on the 7th day... Zeds were created!
Bl**dy hell - I hope mine doesn't look like that! 
The new oil pressure switch does have the little hole in it, as did the one that was replaced. Sight glass checked, and oil level looks ok. Checked the workshop manual and made sure I put the recommended amount in, especially as I changed the filter at the same time.
Think it might be a good idea to whip that sump off and have a ganders, just to be sure.
The new oil pressure switch does have the little hole in it, as did the one that was replaced. Sight glass checked, and oil level looks ok. Checked the workshop manual and made sure I put the recommended amount in, especially as I changed the filter at the same time.
Think it might be a good idea to whip that sump off and have a ganders, just to be sure.
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Ginger Bear
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I had a similar thing on my Z1B flickering light at low revs., the filter was clear, changed the switch and was still happening. Dropped the sump and took the pump out. It turned out to be the Philips screws in the pump body had shook loose and one was sticking out slightly and was preventing the pump from turning properly. Worth a look if all else fails
Now where did I leave my Keys!
When the sump is off you would do well to replace any o rings between sump and engine cases - as well as the gasket.
I think on a 900 A4 there is a 91mm o ring part code 92055-052 that goes in there.
From Mark
I think on a 900 A4 there is a 91mm o ring part code 92055-052 that goes in there.
From Mark
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