1957 IR GRB 125 GYRO FLO Pressure or overheat valve activated
by Andy Lively
(greentield MA, USA)
I recently purchased a 1957 IR GRB 125 GYRO FLO. It had been working fine but the last time I used it the engine sounded like it was working really hard.
A short time later the engine quit and all the air bled out of a valve attached to the bypass valve (it was definitely not the blow down).
I have not found anyone who can advise me as to exactly what I should do.
I have drained all the compressor oil, checked the filter, and drained .the oil cooler radiator, in preparation to put in new oil.
I did find significant sludge on the oil cooler drain plug. I want to flush the cooler but not sure how that is done.