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Help .. oil/temp light keeps coming on ..
Posted by: OzJavelin ()
Date: January 04, 2016 04:14PM

Ivd been slowing finxing stuff on my 65 Monza to the point where its reasonably driveable. Ive had it running for long periods and it idles fine ..

This morning i re-syncd the carbs again so had it started and stopping a lot. I noticed that after a long time of mucking about that when in drive the oil/temp light would keep coming on. Out of gear or moving its fine.

Oil levdl was down a bit, but not bad. It doesnt smell hot or seem to be running on or anything, so i suspect its pressure.

Whats the recommended oil sae and vicsocity for these in a hot climate? Eg regularally over 100F

Im trying to determine if i need to go higher like 20w/50?

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Re: Help .. oil/temp light keeps coming on ..
Posted by: steve c goodman ()
Date: January 04, 2016 04:24PM

Pg cars sometimes exhibit this, in gear idle speed is slow enough that oil pump simply isn't turning fast enough. Also oil press switch values are different between switches. Best first advice is remove sender and install mech gauge on short pipe about 6" long. Then run engine and watch gauge.

best wishes, Steve
Rear Engine Spec. Inc. Golden, Colo.

1962 spyder 3.0L turbo 1965 Crown V8
1967 monza 110/4 1968 monza 110/4
1971 amante gt 110/4
CORSA/RMC/PPCC

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Re: Help .. oil/temp light keeps coming on ..
Posted by: vairmech ()
Date: January 04, 2016 04:28PM

It sounds like you may be in the South West. There are a couple of threads on this site about oil and I suggest you do a search.
You might try a 10W40 synthetic other than Mobil One. Then 20W-50 if that doesn't work. For the higher temps synthetic will do better.

Ken Hand
Handy Car Care
248 613 8586

Vairmech@aol.com

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Re: Help .. oil/temp light keeps coming on ..
Posted by: corventure Dave ()
Date: January 04, 2016 04:28PM

The first quick check I do is put my temporary oil pressure gauge on the engine. Mine is one of the oil filter bolts that is threaded for a gauge on top. I also use this to check new rebuild engines at first start up. I like to know where the pressure is at!

From there if pressures are ok. The issue could be either the temperature switch or more likely the oil pressure switch, closing when the engine is idling under load.
If oil pressure is OK. The switch is suspect. If the oil pressure is low. We have to look at the oil pump and possibly the oil pressure regulator and it's spring.

But yours sounds to me like the oil pressure switch.

Corventure Dave

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Re: Help .. oil/temp light keeps coming on ..
Posted by: RobertC ()
Date: January 04, 2016 04:32PM

vairmech Wrote:
-------------------------------------------------------
> It sounds like you may be in the South West.

He is in Australia...

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Re: Help .. oil/temp light keeps coming on ..
Posted by: vairmech ()
Date: January 04, 2016 04:37PM

OH yeah, forgot. But the same difference, depending on the location it does get hot there!

Ken Hand
Handy Car Care
248 613 8586

Vairmech@aol.com

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Re: Help .. oil/temp light keeps coming on ..
Posted by: RobertC ()
Date: January 04, 2016 05:18PM

vairmech Wrote:
-------------------------------------------------------
> OH yeah, forgot. But the same difference,
> depending on the location it does get hot there!


Yep... not a cold place - especially now that it is summer...

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Re: Help .. oil/temp light keeps coming on ..
Posted by: Kims65 ()
Date: January 04, 2016 05:30PM

My first vair had the same issue back when I had it - '65 Monza 'vert 110PG.

The solution was to check the oil pump cover clearance as suggested by Dave. Mine needed a thinner gasket. Once the gear to cover clearance was set right, the oil light stayed off.

Just one point of reference, may not relate to yours...

John G.
'64 GB Delux
Mission Viejo, CA

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Re: Help .. oil/temp light keeps coming on ..
Posted by: azdave ()
Date: January 04, 2016 05:37PM

Test with a temporary gauge but more often than not, it is a bad pressure switch. Around here they are about $7 at the local auto parts store.

I sell these like corventure Dave mentioned. They ready to install for $35. International shipping might kill the deal.


Dave W. / Gilbert Arizona
66 Corsa 140 4-speed w/factory A/C
66 Corsa 140 4-speed w/factory A/C
66 Corsa 140 4-speed
65 Corsa 140 4-speed
66 Corsa 455 Toronado V8
65 Monza 455 Toronado V8
65 Monza 4dr 140 PG w/factory A/C
65 Monza 4dr EJ20T w/5-speed
66 500 4dr 110 3-speed Display Vehicle




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Re: Help .. oil/temp light keeps coming on ..
Posted by: richard1 ()
Date: January 05, 2016 04:20AM

If the oil pump has not been touched, most problems are with senders. My goes off when temperatures are in the 100's when I go up the mountain, but my laser tells me that (shutting off the engine so the fan does not affect the reading) oil in the filter is only 105ºC. So I bought a new sender that I will install on my next oil change.

I also have the mechanical gauge I can connect when I want to.

For real hot driving, I would not go to a 10W-40 as they are all (to my knowledge) SN oils for worn modern cars. Use a 5W-40 Synthetic CI-4 or CJ-4 made for the diesel trucks and pickups.

Restoration in Bolivia
Richard's Mini Pickup
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How to polish and restore stainless and aluminum trim

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Re: Help .. oil/temp light keeps coming on ..
Posted by: Bob Helt ()
Date: January 05, 2016 07:28PM

I guess that you know by now that the oil temp was sensed only on the 1960 Corvairs. After that it was head temp that was monitored. So if you are getting the dash oil light illuminated, (and not the temp light) it is mostly an oil pressure problem. That could be some worn camshaft bearings or it could be the pump. Or even the sensor. Aftermarket sensors come in various pressure alerts so I suggest you go to your FLAPS and see what they might have to hjelp you.
Bob Helt.

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Re: Help .. oil/temp light keeps coming on ..
Posted by: OzJavelin ()
Date: March 15, 2017 07:11PM

I fixed this problem (until today) with a new oil sender ..
Coming down a long, steep incline the light came on again, and now has decided that it will continue to come on each time I stop.
Switch failure again? Is that likely?

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Re: Help .. oil/temp light keeps coming on ..
Posted by: steve c goodman ()
Date: March 15, 2017 07:21PM

Did you check the oil pressure as was suggested the first time around?

best wishes, Steve
Rear Engine Spec. Inc. Golden, Colo.

1962 spyder 3.0L turbo 1965 Crown V8
1967 monza 110/4 1968 monza 110/4
1971 amante gt 110/4
CORSA/RMC/PPCC

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Re: Help .. oil/temp light keeps coming on ..
Posted by: OzJavelin ()
Date: March 15, 2017 09:15PM

No .. but I did eventually get a mechanical gauge. smiling smiley
Problem is that I've wired the electric pump relay to the oil switch (kill switch), so will require some mods to get it running hot for testing.

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Re: Help .. oil/temp light keeps coming on ..
Posted by: OzJavelin ()
Date: March 16, 2017 02:32AM

Light kept coming on worse and worse on the drive home .. to point where when it had warmed up it would stay on at idle out of gear .. but no noise from the valve gear.

When I checked in the engine bay, still plenty of oil (not that old) but oil running out the sender unit. Im not bothering to test or change anything else until I change this ...

BTW .. Clarks sender so I didnt cheap out on it.

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Re: Help .. oil/temp light keeps coming on ..
Posted by: Ratt643 ()
Date: March 16, 2017 05:33AM

Not sure which oil sender you got from the FLAPS, but it may take more pressure to turn off the new sender. Also, have you dropped the oil pan in the past and checked the oil pickup screen? It could be stopped up with sludge.


1964 Monza Coupe

Maryville, TN
U.S. 129 The"Tail Of The Dragon"

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Re: Help .. oil/temp light keeps coming on ..
Posted by: jjohnsonjo ()
Date: March 16, 2017 05:34AM

how did you tighten the sender, easy to mess them up with using a proper wrench?

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa

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Re: Help .. oil/temp light keeps coming on ..
Posted by: 66vairman ()
Date: March 16, 2017 09:59AM

Yes I've had NEW senders fail out of the box.

But first I'd put on a mechanical gauge to determine what your oil pressure is before doing anymore driving.

Also - did you disconnect the wire from the overtemp switch to make sure it wasn't turning on the light (yes that switch fails also).

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Re: Help .. oil/temp light keeps coming on ..
Posted by: OzJavelin ()
Date: March 16, 2017 01:58PM

Fair enough ..
I'll go grab a new sender (I think its the same as local Holden V8).
I have one of Corventure Dave's gauges which I'll put in.
I'll drop the pan (I have gaskets) and have a look.
Thanks all! smiling smiley

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Re: Help .. oil/temp light keeps coming on ..
Posted by: Wagon Master ()
Date: March 16, 2017 02:56PM

66vairman Wrote:
-------------------------------------------------------
> Also - did you disconnect the wire from the
> overtemp switch to make sure it wasn't turning on
> the light (yes that switch fails also).

Agreed, but I've never been able to turn out the temp/press light with a failed head temp. switch with a slight raising of the rpm's.

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