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Discussion Starter · #1 ·
Hello all,
Looking for som help on adding a electrc oil pressure guage and a low pressure cut off switch on a Case 448. I am aware of the 1/4" pluged port on the oil filter mount housing and looking for some tips on how to plumb it and which oil pressure cut off switch to use?
Thank you in advance
 

· Ingersoll Dealer
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You will need to find a pressure switch down around the 5 PSI range.

The Ingersoll C28979 is a good alternative and well priced:

C28979 - SWITCH OIL PRESSURE - Salem Power Equipment, LLC

Use this to control a relay which interrupts the 12V power to the ignition coil. (relay contacts open when no oil pressure).

Do be aware there is down side to this ... you must crank the engine until oil pressure is achieved before the spark will come on and fire the engine.

Adding a gauge is equally simple ... will need a Tee on that port to do both. Add electric or mechanical gauge, but you'll want low pressure (0-30 PSI) not some hot rod part ... no specific recommendation. Might be better off to make your own with a 30 psi hydraulic gage plumbed in there.

Brian
 

· Ingersoll Dealer
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club
our B 43/48 M have a 3/8" X 1" bolt
for the oil pressure relief valve.
with this set up the valve will
usually open at about 32 psi.
thank you. boomer
Thanks for that detail, Boomer. Do you have information on general running (hot oil) pressures for these? There is a range of course ... new to 'tired'.

I've never gauged one of the Onans and never seen the observed data posted. Please post if you do.

The 30 PSI top side recommendation is general for these small engines.

Brian
 

· Collector of many tractors
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You will need to find a pressure switch down around the 5 PSI range.

The Ingersoll C28979 is a good alternative and well priced:

C28979 - SWITCH OIL PRESSURE - Salem Power Equipment, LLC

Use this to control a relay which interrupts the 12V power to the ignition coil. (relay contacts open when no oil pressure).

Do be aware there is down side to this ... you must crank the engine until oil pressure is achieved before the spark will come on and fire the engine.

Adding a gauge is equally simple ... will need a Tee on that port to do both. Add electric or mechanical gauge, but you'll want low pressure (0-30 PSI) not some hot rod part ... no specific recommendation. Might be better off to make your own with a 30 psi hydraulic gage plumbed in there.

Brian
Not really...
your starting switch can bypass the low pressure cut off switch when cranking.
 
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