My oiling system for the RD-1A has been challenging.

I used a Tilton gearbox pump ($199 from Pegasus Racing) to circulate the
oil through a transmission cooler, to cool my homemade tranny based gearbox.
This worked fine, as there was no pressure involved.

The system appeared to work fine on the RD-1A at first, but a leak developed
in the head of the pump, after a few hours.  I ordered both rebuild kits for the pump, but they did not contain
the seal that had failed, which was the internal relief valve seal.  After many
consults with Tilton, they explained that I would need a new pump, as that seal
was not available. I then found the exact same pump at Tractor supply for $70.
It is a Flojet water spray pump.  I replaced the seal and was back in business for another few flights.

I then plugged off the internal (leaking) relief valve, and installed a hydraulic
adjustable relief valve in the pressure line.  This item has solved the leak for
the time being.  The pressure is set at 50 psi (it will adjust to above 100psi).

I have an pressue alarm and temp sender on the pressure line, we'll see.


George Graham
Mazda Rx7ez N4449E
Sarasota Florida -SRQ

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