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Author Topic:   Mercury Oil System Alarm: How To Bypass
Chris326 posted 08-20-2007 02:42 PM ET (US)   Profile for Chris326   Send Email to Chris326  
How do you by-pass an oil injection pump alarm on a 1997 Mercury 175 xR2?
phatwhaler posted 08-20-2007 11:37 PM ET (US)     Profile for phatwhaler  Send Email to phatwhaler     
[Posits that on other websites you can obtain this information. Hello? This goes without saying, there is always a chance that you can get information somewhere else. However, this inquiry is being conducted here, and we will stand by for answers here, not somewhere else. You do not need to suggest that the answer may lie elsewhere, as that is a given, a universal constant, and suggesting it does not add any information content to our collection here. --jimh]
Tom W Clark posted 08-21-2007 12:37 AM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
Why on earth would you want to bypass the alarm? The alarm tells you when one of four things go wrong. Fix the problem and the alarm will stop. Merely turning the alarm off and continuing to run the motor with a no oil or an overheat condition and you ruin the motor.
jimh posted 08-21-2007 09:20 AM ET (US)     Profile for jimh  Send Email to jimh     
Are you trying to eliminate the entire alarm system or just parts of it?
gss036 posted 08-22-2007 12:52 PM ET (US)     Profile for gss036  Send Email to gss036     
I am with Tom, you are looking for a disaster to happen. You can turn off (eliminate) the alarm for the oil injection if you are premixing, but you "SHOULD" w/o a doubt keep the overheat part. They are both interconnected.
Chris326 posted 08-24-2007 12:49 PM ET (US)     Profile for Chris326  Send Email to Chris326     
Only a part of it - I'm only trying to bypass the oil alarm after removing the oil injection pump and running a 50-1 pre mix.
Tom W Clark posted 08-25-2007 12:23 AM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     


jimh posted 08-25-2007 09:36 AM ET (US)     Profile for jimh  Send Email to jimh     
Chris--There are probably two circuits associated with the alarm and the oil system. There is a switch in the under-cowling reservoir tank which is operated by a float. You can easily bypass this alarm signal. Test to see if the switch is normally open or normally closed. Disconnect the leads to the switch and leave them either open or closed, as appropriate. If your motor has an alarm signal generated by a motion sensor that monitors the movement of the oil pump shaft, this signal will be harder to imitate in order to fool the alarm module. The alarm module is probably expecting a series of pulses from this input. You could try three approaches, but this is somewhat experimental:

--disconnect it and leave open
--disconnect it and attach to ground
--disconnect it and attach to a positive voltage to be determined

I do not recall any source that gives precise instructions on this procedure. If anyone has a pointer that goes directly to such information, I would appreciate having it mentioned.

Chuck Tribolet posted 08-25-2007 10:36 AM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
It's highly likely the tank float closes the switch when the
oil is low. So just unplug it. Or keep some oil in the tank.


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