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Replacing oil pump sensor - any advice?

Old 05-19-2010, 04:10 PM
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Replacing oil pump sensor - any advice?

The metered oil pump sensor got broken in the shipping.

I took the one from my existing engine to replace it.
I noticed that there is an adjustment so I try to put it back as close to possible as the existing one. Both had a while line marked on them so it was easy to realign.

Is there any special thing I should be aware here?

The inside of the sensor rotates in one direction (with a spring). Do I need to crank it or anything?

Just want to make sure I am not screwing up something.

Thank you!
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Old 05-19-2010, 05:30 PM
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If it works you are good....otherwise you will have to adjust it till it does
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Old 05-20-2010, 02:33 AM
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The switch needs to have changed state by step 52. In the attached illustration it looks to have turned on by step 50. I once played around with a used MOP from a dealer friend and the switch did not change state till step 55. Maybe that is why it was replaced (very early in RX-8 history when the mechanic may not have known it could be adjusted).

I stepped the motor through electrically using a power source and a couple of switches. Can't remember the exact details, but I can probably figure it out again if there is any interest. If I recall, it is not possible to step the motor through mechanically. One approach may be to take the cover off, count off a given number of motor steps (you can feel a slight bump at each step as you slowly turn the motor gear), put the cover back on, and see what the state of the switch is.


Some data I obtained from that MOP:
General
Number of teeth on pinion gear: 16
Number of teeth on sector gear: 40
Degrees per step of stepping motor (pinion): 11.25
Gear radius ratio (sector/pinion): 10 (actual best estimate 9.93)
Degrees per step for sector gear: 1.125
Mechanical Stop Thread size: 4-0.7 (4mm diameter, 0.7 mm pitch)
Equivalent steps for one turn of stop: 3
Total angular range of sensor: 19 degrees approximately.

Specific to the used MOP I acquired
Step number when sensor switch opens: 55
Steps before sector gear disengages from pinion: 72
Steps available before disengagement: 12 (assumes maximum steps commanded by PCM=60)
Number of turns of stop to cause disengagement: 4 (12/3)
Available range of sensor in counter-clockwise direction: 10.5 degrees approximately
Equivalent steps for this sensor range: 9.3 (10.5/1.125)
Attached Thumbnails Replacing oil pump sensor - any advice?-scan0006.jpg  
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Old 05-21-2010, 10:52 AM
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wow, you managed to totally confuse me.

I think you are referring to the entire oil pump replacement, not just the sensor, right?
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Old 05-21-2010, 12:24 PM
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He's talking about how the stepper motor and the switch interrelate. Set the switch at the approx angle as the old one...and try it..if it doesn't like it it will throw the car into limp mode and it will be easy to tell Then you will need to move it slightly and try again after a reset of the ECU.....
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Old 05-24-2010, 08:28 PM
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^What he said.
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Old 06-25-2010, 09:48 PM
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How do we reset the ECU?
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Old 06-25-2010, 09:59 PM
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