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Old 07-06-2016, 11:26 PM   #1
Lt. JG
 
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Default Where is Engine Audible Alarm Oil Switch ?

I have a 2400 SCR and get alarms every now and again.

Its a 5.00 Merc with Carb and Alpha 1 leg. closed cooling. Year 2,000

New leg water pump and thermostat installed

Oil Pressure and temperature appear to be ok 165f / 40psi

I cleaned out the Leg oil bottle, it still alarmed.
I disconnected the Leg oil bottle, it still alarmed.

I replaced the temperature switch for the alarm, it still alarmed

I decided to change the oil switch out and believe the part is 87-805605A1

The problem I have is I cant seem to find the audible alarm oil switch. I called Mercruiser and asked where it was located and they did not know ?
They told me there should be 3 oil switches/senders. I found the cone shaped fuel pump cut off oil switch.
T'd into the same fitting is the oil gauge sender unit , however I looked down both sides of the engine and the front of the engine.

Can anyone please tell me if there is in another oil switch and where on the engine it is located, I have seen wiring diagrams showing the switch but cant locate it on the actual engine.

I am new to boating and any help from anyone who knows the location of the switch it would certainly be appreciated.
Thanks
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Old 07-06-2016, 11:39 PM   #2
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Welcome aboard

The gauge sendor which is bell shaped is next to the distributor.

The fuel pump oil pressure switch and alarm switch are just above the blocks oil filter location on the port rear down low by the oil pan interface.

The alarm switch will have only one wire on it, tan.
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Old 07-06-2016, 11:55 PM   #3
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Default Oil Switch

Hi Mike,
Here are pictures of the 2 sensors on the side of the engine are you saying the one with one terminal is the engine oil audible alarm switch, if the gauge sender is located on top of the engine, is it plumbed into the head ?? I know the 2 terminal model is the fuel pump switch
Thanks
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File Type: jpg PUMP SWITCH .jpg (4.9 KB, 45 views)
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Old 07-07-2016, 12:13 AM   #4
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Nope the first one is the gauge sendor and should be mounted on top of the engine near the distributor.

The alarm sendor is small.

Take a look at the merc engine manual located under the documents tab of this site.
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Old 07-07-2016, 12:26 AM   #5
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Hi Mike,
These are the 2 on the side of the engine teed together next to the oil filter at this time I cant look around the distributor. Here is the picture of the alarm sensor the dealer has ordered. however there is nothing like this on the side of the engine next to the oil filter, just the 2 i previously posted
Does the manual actually show a picture with its location or just a wiring diagram ?
Thank you
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Old 07-07-2016, 12:34 AM   #6
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Ok what mentioned is the typical set up.

Yes this last on is it. There is another oil port on the top of the engine back on the port side next to the distributor.

Tan/blue wire.

The manual does not show the location but does have the wiring diagram.
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Old 07-07-2016, 12:35 AM   #7
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mercruiser oil pressure switch


mercruiser oil pressure switch

Link to diagram

Sorry having trouble posting link from iPad
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Old 07-07-2016, 12:38 AM   #8
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Thanks, I will have a look tomorrow for this last sensor next to the distributor on the Port side, you say it is still in the block and not close to the inlet manifold or head ?
Thank you for your help
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Old 07-07-2016, 12:40 AM   #9
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Quote:
Originally Posted by Julian View Post
Thanks, I will have a look tomorrow for this last sensor next to the distributor on the Port side, you say it is still in the block and not close to the inlet manifold or head ?
Thank you for your help

Yes on the block but the intake manifold rear gasket is next to it.
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Old 07-07-2016, 12:44 AM   #10
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Thanks Ill check, its not easy for a big Boy
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