Rotary Car Club - View Single Post - More problems, coolant overflow not working?

rx4ur7 · 10-20-2009, 01:11 PM

Does not sound like seal issue. No smoke no single rotor start up.
How much coolant in 3 months?
Pressure check it, cold and hot. Let it sit for a while. I have had pin hole leaks in hoses or fittings that did not show cold. Pin holes in hoses common, fittings rare.
One never showed any puddles under the car at client's home or shop. Finally found that there was a pin hole in a fitting, coolant was spraying on to the exhaust manifold thus never reaching the ground. Not enough to make any steam. This thing was tiny. You could hardly see the stream. Would not leak cold. This is a one in a million.

My experience in order of failure-(not seal related)
slight coolant loss - Radiator, heater, manifold hoses, radiator, heater core fittings, heater core.

Over flow tank over flow(not seal related): Radiator cap 95%, hose between radiator and tank 5%. If the bottom rubber of the cap is swollen or extends past the metal disc replace it. Use a quality cap if you do not use Mazda. Do not go cheap.

Just a builders hint: When change a motor, if you have not before the motor popped, replace all the hoses save yourself a lot of grief. Make sure all fittings are clean no rust or corrosion.

10-20-2009, 01:11 PM	#15
rx4ur7 Rotary since 1972 Join Date: Nov 2008 Location: Tucson Posts: 231 Rep Power: 17	Does not sound like seal issue. No smoke no single rotor start up. How much coolant in 3 months? Pressure check it, cold and hot. Let it sit for a while. I have had pin hole leaks in hoses or fittings that did not show cold. Pin holes in hoses common, fittings rare. One never showed any puddles under the car at client's home or shop. Finally found that there was a pin hole in a fitting, coolant was spraying on to the exhaust manifold thus never reaching the ground. Not enough to make any steam. This thing was tiny. You could hardly see the stream. Would not leak cold. This is a one in a million. My experience in order of failure-(not seal related) slight coolant loss - Radiator, heater, manifold hoses, radiator, heater core fittings, heater core. Over flow tank over flow(not seal related): Radiator cap 95%, hose between radiator and tank 5%. If the bottom rubber of the cap is swollen or extends past the metal disc replace it. Use a quality cap if you do not use Mazda. Do not go cheap. Just a builders hint: When change a motor, if you have not before the motor popped, replace all the hoses save yourself a lot of grief. Make sure all fittings are clean no rust or corrosion. Last edited by rx4ur7; 10-20-2009 at 01:18 PM.