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  #1 (permalink)  
Old 03-20-2009, 04:29 PM
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S&S 124 low oil pressure

This one is driving me crazy. I start the bike and get between 25 and 40 psi of oil pressure at around 1200 rpm (idle with choke). After reving the engine a couple times the needle jumps around and, after warming up for a few minutes, settles at 0 at idle and 10 at anything over 1500 rpm. I pulled the gauge and cranked the engine to make sure oil was coming out, no problems. I pulled the plug on the pressure regulator and it appears to be moving freely. I pulled the plug on the check ball and oil comes out no problem. I've heard the springs on the regulator valve can be weak, but why would it jump around at first? Could it be that the valve is sticking? Any advice would be appreciated. The engine is a S&S 124 with the S&S HVHP oil pump.
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Old 03-20-2009, 05:03 PM
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Theres lots of threads here on oil pressure gauges and low readings. Oil heats up, thins out, pressure drops to where it's supposed to be which is lower than the gauge can accurately represent. Not to say that it's not possible to have low oil pressure problems, but seems much more common to be gauge issues
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Old 03-20-2009, 05:49 PM
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Thanks for the info. I was worried about the gauge, so I checked the resistance on my oil perssure switch. I'm not running a light right now. I seemed to open at around the same time as the gauge read zero. Also, the oil tank was cool to the touch when the pressure was reading zero. I've seen many of the threads you mention about zero pressure being OK, but what has me confused is the needle jumping around for no reason. Maybe I should get a new gauge?
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Old 03-20-2009, 06:00 PM
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Quote:
Originally Posted by pacinator View Post
Thanks for the info. I was worried about the gauge, so I checked the resistance on my oil perssure switch. I'm not running a light right now. I seemed to open at around the same time as the gauge read zero. Also, the oil tank was cool to the touch when the pressure was reading zero. I've seen many of the threads you mention about zero pressure being OK, but what has me confused is the needle jumping around for no reason. Maybe I should get a new gauge?
First of all, 0 psi of oil pressure is NOT OK!

But just because your gauge is telling you that - DOESN'T mean that you have 0 psi

The fact that your gauge is jumping all over the place only tells me that oil pressure gauges are notoriously inaccurate - some more so than others

But an idiot light is much more accurate than a gauge

Gauges are cool for decoration - but I wouldn't go tearing my motor apart - based on what a $29.99 gauge told me

I'd Try another gauge before I did anything else



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Old 03-20-2009, 06:53 PM
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I believe some of the fluctuation comes from the lope of the motor.
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Old 03-20-2009, 07:17 PM
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Quote:
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....But an idiot light is much more accurate than a gauge...
I think he is saying the sending unit for the idiot light (he doesn't have) is indicating low oil presure once it heats up. If he is getting both a zero oil pressure reading and a low oil light, I would not run it until the problem got resloved.

Mike
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Old 03-20-2009, 07:50 PM
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Yup........
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Old 03-20-2009, 09:56 PM
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You might want to check out this web site (good info and products):

http://www.ertproducts.com/
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Old 03-20-2009, 10:53 PM
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Quote:
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I believe some of the fluctuation comes from the lope of the motor.
The lope of the motor is not going to cause wild fluctuations of the needle on the pressure gauge

With an idle of 1000 rpms (Even at an extremely low idle of 500 rpms) there should be enough VOLUME of oil flowing through the motor that the needle would be unaffected by any pressure variation

It's pretty normal for the needle to vibrate, however
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Old 03-20-2009, 10:58 PM
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OOPS, I don't know WTF I was thinkin'
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Last edited by Merlin Hawaii; 03-21-2009 at 12:24 AM..
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Old 03-20-2009, 11:07 PM
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Quote:
Originally Posted by pacinator View Post
so I checked the resistance on my oil perssure switch. I'm not running a light right now. I seemed to open at around the same time as the gauge read zero.
Checking the resistance (ohms) of the switch isn't going to tell you anything, other than that the switch is good or bad

To check whether the switch is coming on when the oil pressure is below 1.5 psi, you need to check the voltage

If the switch is giving you a 12.75 v reading when the bike is running - then yes, you have a problem

But that isn't how I read what you've said
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Old 03-20-2009, 11:10 PM
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usually the gauge on an evo mounts on the tappet screen plug. first thing i'd do is make sure the motor has fresh oil and is running what s/s calls for. 20w-50 synthetic is what they're calling for now. we have tested numerous motors with a multitude of oil pumps and most end up running close to 0 at idle, even the new s/s pump as well as the tp eng. pump. a cool oil bag isn't uncommon unless you've ridden the bike a few miles. feel the filter, i'd bet it's much warmer.
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Old 03-20-2009, 11:10 PM
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Quote:
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I think he is saying the sending unit for the idiot light (he doesn't have) is indicating low oil presure once it heats up. If he is getting both a zero oil pressure reading and a low oil light, I would not run it until the problem got resloved.

Mike
I agree, but I don't see anything that indicates he's getting a low psi signal from the light
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Old 03-20-2009, 11:13 PM
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whoa, the oil switch doesn't give you voltage at all. it creates ground when it's actuated by the oil pressure. so testing when the switch is actuated would be the same as having it hooked up. you can do this with a test light, one end at a 12v source, the probe on the switch post.
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Old 03-20-2009, 11:26 PM
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Quote:
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whoa, the oil switch doesn't give you voltage at all. it creates ground when it's actuated by the oil pressure. so testing when the switch is actuated would be the same as having it hooked up. you can do this with a test light, one end at a 12v source, the probe on the switch post.
That's pretty much what I said

If you get a 12v reading at the switch (or test light) then the switch is indicating less than 1.5 psi

I never said that the switch supplied the 12v
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