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-   -   low oil pressure (http://www.mariahownersclub.com/forum/mercury-mercruiser/9393-low-oil-pressure.html)

dusty72 06-06-2014 01:07 AM

Re: low oil pressure
 
ok, all connections cleaned. there was a little corrosion at the sender. we will see what happens when I take it out Saturday.

Should I start a new thread for the tachometer? It just sits on 50 and doesn't move. I can move the dial with a magnet though. It is a Faria.

mikeyt 06-06-2014 02:18 AM

Re: low oil pressure
 
Same possible issues (poor connections) with the tach. There is also a small dial on the back of the tach that reads 2-4-6-8. Give the dial a spin a few times then re-set it to 6 cyl and see if that helps. If it isn't the connections & the 'spin the dial' trick doesn't resolve it then its likely time for a new tach.

dusty72 06-06-2014 02:21 AM

Re: low oil pressure
 
Tried all that. Oh well, I will see if Faria really does have a lifetime warranty.

dusty72 06-06-2014 11:39 AM

Re: low oil pressure
 
You fellas have been g great! One last question. Where are the connections for the tach o the engine? I have only checked the ones to the gauge itself.

dusty72 06-06-2014 11:40 AM

Re: low oil pressure
 
Is anyone from Texas?

Hudson River Steve 06-06-2014 12:50 PM

Re: low oil pressure
 
Connections for the tach on the engine are in the wiring harness to the ignition coil on the engine. I have never heard of a problem there...it is always corrosion on the printed circuit within the Faria tachometer that causes the problem. I know you said you tried it but I suggest you try to rotate the 4/6/8 dial on the back of the tach again...this time try pushing in on dial while you spin it. The only other suggestion is to remove all the wires and slightly loosen the nuts on the BATT, GND & SIG studs on the rear of the tach, spin them as much as you can (they are captured within the gauge) and then reassemble everything. The internal electronics of the tach are bullet proof...the weak link in Faria's design is corrosion of the electrical connections from the brass studs to the printed circuit board and the selector switch.

dusty72 06-06-2014 01:08 PM

Re: low oil pressure
 
Thanks. I will give an update tomorrow night.

jarwiebe 06-07-2014 12:31 PM

Re: low oil pressure
 
Quote:

Originally Posted by dusty72 (Post 52967)
Should I start a new thread for the tachometer? It just sits on 50 and doesn't move. I can move the dial with a magnet though. It is a Faria.

I concur with ensuring all connections are clean and tight as well as spinning the 4,6,8 dial. What seems suspicious is that the dial will not drop back to zero, this would suggest that either the return spring for the needle or the bearing in which the needle shaft rotates are at fault, I don't think either of these situations would be user fixable.

Hudson River Steve 06-08-2014 04:30 PM

Re: low oil pressure
 
Actually there is no return spring, but there is a return magnet. My money is still on high resistance due to corrosion. If there is no electrical connection on the 4,6,8 switch it will behave as if the needle is stuck.


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dusty72 06-08-2014 05:31 PM

Re: low oil pressure
 
Ok, just got back from taking her out. Oil pressure gauge works! Reads about 20 when cruising. Tach not so lu
cky. When I turn the key over it drops to zero fro 50 going the wrong way. Afer it cranked up, went back to 50 and stayed there. I did not have my magnet with me, next time I will drag the needle back aroun to zero before I fire her up. On a side note, the speedo worked, I had browsed some threads, that was an easy fix. The hardest is going to be the trim. I might have that one done. Thanks a bunch!


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