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Oil Pressure Connection #682856
February 24th 2015 10:40 am
February 24th 2015 10:40 am
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nikothenomad Offline OP
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So, we are getting ready to hit the road again. I was finally tucking away all of the wiring I've been sorting through when I discovered a connector that looked like it should be together but it wasn't. A read of my FSM revealed that it was to tie the oil pressure gauge in with the oil light.

Although each have been working independently apparently someone had disconnected this link long before we received the van and I never realized it since it was tucked up tight behind the dash.

Anyway, I re-connected it and learned why it had been disconnected, it blinks constantly.

So... here's the thing. We've owned the van for at least four years now and best we know have not had a problem with oil pressure. Of course when I get a chance to test it I will but meanwhile...

Is there anything else that might could make that light blink constantly?



Nicole
1988 Dodge B250 5.9l 360 Ram CamperVan / 727 Tranny / Rochester Quadrajet Carb
www.nikothenomad.blogspot.com
Re: Oil Pressure Connection [Re: nikothenomad] #682875
February 24th 2015 12:46 pm
February 24th 2015 12:46 pm
Joined: Aug 2001
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Fircrest, WA
Reed Offline
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The oil pressure "idiot light" is a simple on-off switch system. When oil pressure falls below a certain point (I forget what the factory sending unit pressure point is. Something in the neighborhood of 8 PSI if I recall) the contacts in the sending unit close and the circuit is completed and the light in the dash comes on.

The light is not supposed to blink. It will blink if the oil pressure is right at the point where each pulse from the oil pump provides enough pressure to open the the ground in the sending unit temporarily but the oil pressure is so low that the contacts close again and the light comes on.

Does is blink at all RPMs? Does it blink when the engine is cold and first started up? Your engine actually needs only about 10 PSI oil pressure per 1000 rpm, so oil pressure of less than 10 PSI at can be perfectly fine.

You definitely want to verify your oil pressure with a mechanical gauge when you get a chance. You can get them cheap at auto parts stores. You might ave a fine motor but a failed sending unit.


Windows- they're what make a van worth owning!
Re: Oil Pressure Connection [Re: nikothenomad] #682878
February 24th 2015 1:04 pm
February 24th 2015 1:04 pm
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nikothenomad Offline OP
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Thanks, Reed.

I do want to know the actual oil pressure and will grab a gauge at some point. Meanwhile, the pressure on our dash gauge has always been right at mid level or dropped a bit lower on a super warm day when we get to a stop light.

When I connected the wires to make the gauge and light work together and started the van (meaning it was cold) the light immediately was blinking even though the oil gauge itself showed its normal (midway) pressure reading.

Your theory of the pressure being right at the pulse point is interesting.

Also, I didn't let it run very long with the light connected since I wasn't sure what was happening. So, not sure if it changes with rmps or not.

Wondering if there is a way to test the sender?





Nicole
1988 Dodge B250 5.9l 360 Ram CamperVan / 727 Tranny / Rochester Quadrajet Carb
www.nikothenomad.blogspot.com
Re: Oil Pressure Connection [Re: nikothenomad] #682883
February 24th 2015 2:21 pm
February 24th 2015 2:21 pm
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Fircrest, WA
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Interesting. If you have the rare gauge and light combination (most vans had one or the other), my guess is that youhave a failing sending unit for the light. Not really a way to test the sender other than hooking up a mechanical oil pressure gauge and seeing the PSI the light comes on at.


Windows- they're what make a van worth owning!
Re: Oil Pressure Connection [Re: nikothenomad] #682884
February 24th 2015 2:31 pm
February 24th 2015 2:31 pm
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nikothenomad Offline OP
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Well then, I guess I'll be getting a present this week :o)

Yes, we have the combination of the light and the gauge. I'd prefer the gauge to show the actual PSI but I'll deal with that at a later date.

For now, I simply want things working they way that they should be.

By the way, I'm thinking the sending unit is the bell'ish shaped part since it just has the one wire connector on top. Sort of confused as to what each part is.


Last edited by nikothenomad; February 24th 2015 2:39 pm.

Nicole
1988 Dodge B250 5.9l 360 Ram CamperVan / 727 Tranny / Rochester Quadrajet Carb
www.nikothenomad.blogspot.com
Re: Oil Pressure Connection [Re: nikothenomad] #682885
February 24th 2015 2:46 pm
February 24th 2015 2:46 pm
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Fircrest, WA
Reed Offline
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THe big gold bell is the sending unit for the gauge. The sending unit for the light is a small black an silver flying saucer shaped thing. It is on the same T fitting as the guage sending unit, but it should have three male electrical terminals coming out of it. The choke (+) wire is one of the lines that attach to the idot light sending unit.


Windows- they're what make a van worth owning!
Re: Oil Pressure Connection [Re: nikothenomad] #682895
February 24th 2015 5:19 pm
February 24th 2015 5:19 pm
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nikothenomad Offline OP
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Hmmm... I'm going to have to get in there and look again.


Nicole
1988 Dodge B250 5.9l 360 Ram CamperVan / 727 Tranny / Rochester Quadrajet Carb
www.nikothenomad.blogspot.com
Re: Oil Pressure Connection [Re: nikothenomad] #682896
February 24th 2015 5:20 pm
February 24th 2015 5:20 pm
Joined: Aug 2001
Posts: 12,027
Fircrest, WA
Reed Offline
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I will try and scan the pertinent pages out of my FSM.


Windows- they're what make a van worth owning!
Re: Oil Pressure Connection [Re: nikothenomad] #682905
February 24th 2015 7:08 pm
February 24th 2015 7:08 pm
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nikothenomad Offline OP
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nikothenomad  Offline OP
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Thanks. I've got some info in my FSM but it isn't really that clear. I'll look at it again.

Been thinking that since I want to eventually install a gauge that actually displays the pressure reading why not just do that instead of buying a tester. Essentially same thing only two for one... unless I'm missing something.

Can't quite figure out though why the gauges all go up so high when the pressure is typically pretty low?



Nicole
1988 Dodge B250 5.9l 360 Ram CamperVan / 727 Tranny / Rochester Quadrajet Carb
www.nikothenomad.blogspot.com
Re: Oil Pressure Connection [Re: nikothenomad] #682907
February 24th 2015 7:30 pm
February 24th 2015 7:30 pm
Joined: Aug 2001
Posts: 12,027
Fircrest, WA
Reed Offline
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Reed  Offline
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Posts: 12,027
Fircrest, WA
Oil pressure gauges are designed for a variety of engines and operating conditions. A freshly rebuilt or tight engine will have oi lpressures in the 50-60 PSI regularly. For example, about ten years ago I had the 351 that is currently in my 89 Ford van rebuilt. Immediately after the rebuild the engine had about 50 PSI of oil pressure hot or cold, regardless of RPM. Now after it has worn in a bit it has 55 PSI on cold startup and about 25 PSI at hot idle. The PSI goes back up to about 55 when I am cruising down the highway. If your engine gets more than about 60 PSI you have a problem somewhere. Safe operating range for oil pressure in a standard street driven engine is about 10-35 PSI hot.

The "tester" I am referring to is the same thing as an aftermarket gauge that you want to put in the gauge cluster. It is a mechanical oil pressure gauge (or electric, is you are up for buying the sending unit, too).

The sending units are pretty simple. Coming out of the block by the distributor is a hexagonal tube. Screwed into the tube will be the gold bell for the gauge and the sending unit for the idiot light. The idiot light sending unit has three wires- one for the gauge, one for power, and one for the choke. The FSM should have clear pictures of everything, including the wiring diagram.


Windows- they're what make a van worth owning!
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