Rover / Lucas 2S Mk
10501 APU Page 4

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I wanted to add an RPM Indicator to the Gas Generator electronically, thus I needed to find a suitable pulse output for the probe which would be needed for generating the signal, the oil pump seemed the only choice.

Blanking plate removed and inside the shaft was a fine threaded hole, no gear of spline to take a pulse from, but otherwise a good start.
I purchased a few small gears that could be adapted to fit the shaft, the one chosen is from the drive gear of a mini-moto bike.

The thread was cut off and then faced, a hole drilled in the center so that the gear can be bolted to the shaft.
A spacer was made to be a tight fit inside the opening to the shaft and a new outer aluminium cover was machined to accommodate all of the above.

New pulse gear fitted.
A hole was drilled and tapped so that a reluctance probe could be fitted and set at about 0.5mm away from the tips of the gear.

Ian kindly made me one of his Tacho Driver boards, a dual board modification as it would also drive the Gas Generator as well as the Power Turbine Gauges. He has made a CD which he sells on eBay that gives various wiring diagrams for such a device and can be found here should you be interested.

Driver board, relays and all the wiring installed in to the control/ termination box on the engine.

The Starter Cut Out, Resistance Coil and Starter Solenoid all wired in ready for use.
I have also added an Oil Pressure Sender to the system in addition to the low oil pressure switch, just for piece of mind.

Custom designed oil tank fitted with a heafty K&N Breather Filter which is attached to the top.

A picture showing the oil pipe work, just out of view is the oil temperature probe, fitted in to the bottom right corner of the oil tank.
Making use of various flanges and adapters an outlet pipe work arrangement has been made for the Compressor Scroll. When running the engine an Anti Surge Valve is required when initially starting the engine and this closes as the main outlet valve simultaneously opens during the main engine start sequence, this is a significantly smaller arrangement than would have originally been used in the Nimrod.

Still only tack welded for setting up purposes, but looks good and all the parts fit without fouling.
Anti Surge Valve (NO) top and Main Delivery Valve (NC) bottom. Both Valves connect to the termination box using quick release electrical connectors as the whole assembly will be removed when not in use.

     
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