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 Oil Pressure Light

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Vroom
Squinternotto
Squinternotto
Vroom

Posts : 3
Join date : 2021-05-30

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PostSubject: Oil Pressure Light   Oil Pressure Light Icon_minitime1Tue Jun 08, 2021 5:23 am

Hi everyone,

This is my first post here. I'd appreciate if I could get some advice. I just bought a 2013 GRiSO and 10 minutes into the ride home, in hot city traffic and hot and humid weather, saw the oil pressure warning light come on briefly and then turn off. After some more experience with it, here is how it happens:

It's always fine when riding, and always fine when idling, and always fine for the first many (10 or more) minutes after riding on a cold engine. If you blip the throttle at idle (whether stopped or at speed putting it into neutral), it comes on as it hits 1500rpm. It also comes on after coming to a stop, idling, and then accelerating, as the needle hits 1500rpm. It then turns off shortly after by around 2000rpm. It also comes on if you ride it slowly in gear at 1500rpm, whether from idle, or slowing down from a higher speed. Again, once it passes around 1700-2000rpm, it shuts off. Or if you blip the throttle while idling, past the 1500rpm mark, it comes on and stays on until you get it past the 1700-2000rpm.

No weird sounds from the engine. The previous owner had not ridden the bike in the couple of years he owned it so he wouldn't have known about it. He kept it stored in a pristine garage. The problem either started in the time the bike was stored or perhaps the owner before that had seen it.

After I got home, I noticed that in the box of stuff I got with the bike included a ziploc bag with a brand new oil pressure sensor. I did my research on the board and found that this could be the culprit and wondered if the original owner (prior to the one I bought it from) had been getting ready to replace it or if he just had it as a spare.

So I installed the new sensor. The problem looked solved after a longer 25 minute ride in the country (no traffic) with plenty of stops, idles, 1500rpm tests etc. But then, just as I was pulling back into the garage victorious, bang! it came on at 1500rpm.

I'm not sure what to do next. Could the oil pressure switch I found in the bag be bad (it was brand new)? Should I buy another?Could it be a wiring connection issue? Is the next thing to try, to replace the upper gasket in the sump (as I read on the boards)? Or should I take it to a dealer to have them check the oil pressure and perhaps change the oil pump if that is the issue?

Thanks -- your help is much appreciated.
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Vroom
Squinternotto
Squinternotto
Vroom

Posts : 3
Join date : 2021-05-30

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PostSubject: Re: Oil Pressure Light   Oil Pressure Light Icon_minitime1Tue Jun 08, 2021 6:19 am

One more item that I only noticed now: There is a bit of oiliness at the bottom 2-3 inches of the front of the sump case. I wonder if that could point to a leak at one or both of the gaskets, which could perhaps mean that the internal one has a leak which is affecting the oil pressure. Perhaps, with the bike sitting for almost two years, the gaskets at the sump deteriorated. I did read on this board, that the internal gasket could cause oil pressure issues.
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Pete Roper
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Pete Roper

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PostSubject: Re: Oil Pressure Light   Oil Pressure Light Icon_minitime1Tue Jun 08, 2021 11:00 am

The most likely cause of the problem is going to be a blown it spacer gasket between the sump spacer and the block. The factory gasket is very thin and frangible and can easily fracture and get pushed out leading to oil pressure being lost. This is a serious issue and can lead to big end damage and/or failure so it should be addressed. The gasket should be replaced with the thicker aftermarket type that allows for greater crush and more effective sealing.

Note that this is NOT the sump gasket, (Although this too needs to be replaced when the sump is removed.) but the gasket above that between the spacer and the block.

Another possibility is the oil pressure sender switch but in this case I'm leaning towards the gasket being the issue.

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Vroom
Squinternotto
Squinternotto
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PostSubject: Re: Oil Pressure Light   Oil Pressure Light Icon_minitime1Tue Jun 08, 2021 7:20 pm

Thanks so much for the quick reply, Pete. Much appreciated. I will source the sump spacer gasket and the sump gasket tomorrow and will keep the bike parked till they arrive. I'll aim for aftermarket ones made from either metal or silicone. Seeing the bit of oily mess at the front of the sump pan really seems to point to what you said and gives me hope of an easy solution.

Cheers!
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Pete Roper
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PostSubject: Re: Oil Pressure Light   Oil Pressure Light Icon_minitime1Tue Jun 08, 2021 8:06 pm

Nope. The oil galleries are internal. There will be no external sign if it has blown out.

The thicker aftermarketgaskets are available from MG Cycles among others. They are generally green in colour. I would advise against a silicone type gasket in this application.
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Brent S
Biondino
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Brent S

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PostSubject: Re: Oil Pressure Light   Oil Pressure Light Icon_minitime1Tue Jun 08, 2021 11:58 pm

Pete Roper wrote:
Nope. The oil galleries are internal. There will be no external sign if it has blown out.

Pete, does this mean that the oil pressure light is the only giveaway that this seal has blown?
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Pete Roper
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PostSubject: Re: Oil Pressure Light   Oil Pressure Light Icon_minitime1Wed Jun 09, 2021 1:01 am

The light, in hot weather and extreme cases you get the 'Oil Can' icon at the bottom of the dash and in time the rods will start to knock as the big end shells wear and the oil can no longer wedge. There is no external leakage, no sign detectable by just gurning at the motor as it sits there. There is no drop in oil level as it's all still 'In there', it just isn't getting to where it needs to work.

And it's not a seal as is usually known as a seal. It's a gasket. If you search the issue you'll find a fucktonne of info on it. It's State of Origin footy tonight but if nobody else gives you a link I'll repeat post the whole thing again. Perhaps I should do a pictorial and explanation so it can be posted in the Tech area but it is tedious endlessly repeating stuff.
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Brent S
Biondino
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PostSubject: Re: Oil Pressure Light   Oil Pressure Light Icon_minitime1Wed Jun 09, 2021 1:10 am

Ok, point taken Pete. Thanks.
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motor-timothy
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Join date : 2016-12-20

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PostSubject: Re: Oil Pressure Light   Oil Pressure Light Icon_minitime1Thu Jun 10, 2021 1:18 pm

Pete Roper wrote:
The light, in hot weather and extreme cases you get the 'Oil Can' icon at the bottom of the dash and in time the rods will start to knock as the big end shells wear and the oil can no longer wedge. There is no external leakage, no sign detectable by just gurning at the motor as it sits there. There is no drop in oil level as it's all still 'In there', it just isn't getting to where it needs to work.

And it's not a seal as is usually known as a seal. It's a gasket. If you search the issue you'll find a fucktonne of info on it. It's State of Origin footy tonight but if nobody else gives you a link I'll repeat post the whole thing again. Perhaps I should do a pictorial and explanation so it can be posted in the Tech area but it is tedious endlessly repeating stuff.

Is there always some warning like the rods knocking or can this near-instantly destroy the engine? Or is it more of a gradual process of engine wear taking weeks/months/years?
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