[eja997]

I have twin mercury 150hp saltwater series. One of them is a newly rebuilt power head.When I get about 3000 rpm the low oil buzzer goes off. I added oil directly to the gas so it was safe to run the engines. There seems to be no loose clamps or holes in any of the lines. Oil is getting from the tanks to the resevoirs on the engines. When I ran the engine at 4500 rpm the new engine shut off and would not restart for over 2 hours.

Does anyone have any suggestions???

Thanks

[gss036]

Rather than having to type all this info, I copied it from another forum, A guy with the name of Tom Clark posted it telling a guy how to check the motion pick up on his engines. Think that would be my first thing to do.
If that is the problem, then somebody messed up on the rebuild maybe. If the plastic gear on the crank is damaged, the only way to fix it is another tear down of the block.

I dug out my factory shop manual. Here is what it says about testing the motion sensor at the oil injection pump:


quote:
--------------------------------------------------------------------------------
1. Disconnect white lead from (warning) module assembly. Check voltage from the white lead from the module. Voltage should be 12 V +/- 1V.
2. Reconnect white lead from module for remaining checks. Insert probe into wire connection for voltage checks.

3. Check output voltage to the sensor by connecting voltmeter to (blue/white) sensor lead. Remove spark plugs and ground spark plug leads. Turn ignition to "ON". Use emergency start rope and rotate flywheel while observing voltmeter. Output voltage should peak at 5V +/- 1V and then drop to less than 1.0 volt during every 2 revolutions of the engine.

4. If NO voltage is present then one of two possibilities exists:
- a. Motion sensor defective -- replace and repeat test for voltage.
- b. Drive system defective -- test as in following section.

Check drive system (of the oil injection pump) as follows:

1. Use 50:1 gas and oil mixture and start engine. Be sure engine has proper cooling water.

2. Disconnect link rod connected between oil injection pump and carburetor linkage.

3. Disconnect outlet hose of oil injection pump and observe if injection pump is pumping oil. If pump is not pumping oil, the drive system to the pump is faulty.