oil presure warning light on

**gromit** · 21st February 2013, 05:09 PM

Originally Posted by incisor

original recommendation was sae 30 oil above 32 deg sae 20 below 32deg

sae 50 is about as thick as sae 90 gear oil and is what was recommended for the gearbox and transfer cases in the early ones..

i agree with glen when he said penrite 20w-60 for the old girls power plants...

The 60 of the Penrite multigrade would be thicker at 100C than the originally specified sae 30 and also a 20W 50 multigrade.
I just visited their website and they push the 'extra 10' in viscosity index as a plus point for our climate. Thicker at temperature must also mean more effort to push round the engine ?

I don't know enough about oils to comment plus everyone has their own recommendations based on the fact it worked OK for them.

Colin

**mfc** · 21st February 2013, 05:16 PM

the penritte is equivelant to a 40 w,its in as we speak but it was to wet to run it last night, ill don the balaclava tonight and report back
I changed out the transfer and gear case with penrite classis 90w and its made a hell of an inprovement...heaps quieter, smother shifting.
ill telll you how it goes later

grommit.... yea i recon its worn but ive got a spare im building

**mfc** · 21st February 2013, 11:01 PM

just did the same run that would have the oil light on at power of or stopped,but with the classis oil in g box {90w} transfer and engine classis medium.....all seems sweet mutch easier changes in the box and no oil light untill you stop for 40 seconds, soon as you touch the accelerator its normal

**JDNSW** · 22nd February 2013, 08:50 AM

Originally Posted by mfc

anyone know the thread and size of the oil presure switch?

Guessing - 5/16 or 3/8"BSF Not something you will find easily. I suggest you remove the switch and measure the diameter outside the threads and the number of threads per inch will identify it. But I would be surprised if it is not BSF. Once identified, you might want to consider getting or making an adapter to a more commonly available thread.

John

**gromit** · 22nd February 2013, 01:03 PM

Originally Posted by mfc

just did the same run that would have the oil light on at power of or stopped,but with the classis oil in g box {90w} transfer and engine classis medium.....all seems sweet mutch easier changes in the box and no oil light untill you stop for 40 seconds, soon as you touch the accelerator its normal

On my Series I the oil pressure light doesn't always go out until you blip the throttle. Sometimes it comes on at tickover and a blip of the throttle it goes out.
I'm putting it down to a 'sticky' pressure switch although the history of the motor is unknown.

I should put a pressure gauge in and check but I'd probably be frightened by the result !

Colin

**mfc** · 23rd February 2013, 05:16 AM

same story here colin. undoughtably worn engine but with the older oil it only comes on after a spirited up hill run on dirt {as you stop} or on the flat rollling to a give way etc or pull up in driveway, any load or acceleration and its gone also speed up to 50 mph rather than 40 with all new fluids......{not terminal velocity either,i fear that}
on a positive note i mesured the bores on my other engine {new rings } and spot on spec for an unrebored engine and no lip on the top ....yay.... ill mesure the crank journels today, the bloke said they were fine{mesured} but the engine needs to come apart to be cleaned out..
...blinkers and all elecs working and minimal leaks when hot, steering seems good ,just need to touch up the brakes and find a 1955 horn....
cheers mark

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