Oil Pressure fluctuation

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Lost Boy
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Oil Pressure fluctuation

I have a 1.8 Supersport K Series, now 19 years old. For the first time ever I have noticed low oil pressure on tickover (at the top of the red) and the gauge reading lower than normal even when under load, there also seems to be some "stickiness" about the reading which I haven't seen before. The oil is relatively new and is at the correct level, so I'm thinking it could be a faulty oil pressure sender??

Has anyone experienced this before?

Does anyone know where to find the oil pressure sender and is it easy to change?

Thanks in advance

SM25T
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If electrical gauge, sender is poor quality and generally short lived. Screws into oil filter housing. For the price of a new sender (CC or Redline), you can buy a mechanical oil pressure gauge and capillary tube. Very easy to fit and gives a nice 270 degree sweep of the needle on the gauge. Many of us have done this swap.
7_Malc
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I recently has a very similar issue on my 1.8 K (2000) … my gauge was dropping to zero and bouncing around too… very worrying. A new sender from Chris at Redline solves the issue immediately. Yes a mechanical upgrade is an option, but not to everyone's taste or budget. New sender is now 2-3000 miles in and working fine. Keeping the contacts clean with WD40 seems to help, as does a healthy wrap in insulation tape or heatshrink on the connecting cables - it all hangs off the leading edge / bottom of the sump so picks up all the muck on the road. 

SM25T
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I tried sealing the openings on a new sender with silicone sealant ... but it didn't help extend its life !
Lost Boy
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Thanks Guys, I've located it and it does look pretty rough but 19 years in, I guess I'm not surprised! Maybe a stupid question, but do I need to drain the oil to fit a new sender?

 

 

SM25T
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No. Just put something under to catch a little dribble.
Jonathan Kay
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A new sender from Chris at Redline solves the issue immediately.

I think that's what I'd probably do.

Jonathan

paul richards
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As stated it’s most likely to be the sender. Do you still have foam in the sump? The other alternative could be the foam breaking up and blocking the pickup. 

Regional Controller North and LADS Joint AR  Drink

"It's only a car club"

Lost Boy
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Yes I still have foam, that had crossed my mind, hopefully will make it through a trackday on Friday!!

Thanks Guys

 

 

Jonathan Kay
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Please don't put off changing or discarding the foam.

Jonathan

Alastair B
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If you are going to change and stick to electrical I would recommend remotely mounting the sender so to avoid the engine vibrations that eventually destroy the sender unit. Remote mounting kits are covered here in the archives.

Ibought Remote T-LMA095/2: 0.5M - LMA095/2Remote T-Piece Kit M12 from LMA automotive, think they do club discount too. Mounted on one of the straps holding a horn unit, kept one horn operational.