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Piper Service Bulletin Number 84 Winterization of J3C-65
It has been brought to our attention that, in extreme cold weather operation, the J3C-65 has been giving some trouble due to cold engine operating temperatures. In order to eliminate this hazard and insure better engine operating temperatures, it is considered satisfactory to follow the procedure set forth below. It is suggested that these procedures be followed in temperatures of 40º F or below.
1. All J3C-65 airplanes, with muffler installation, up to serial number 15396.
a. The aluminum breather tube (Part No. 84332) can be lagged with 1/16 to 1/8 felt or some similar material, which should extend all the way to the bottom of the tube. This lagging will help eliminate the possibility of condensation freezing in the tube.
b. To obtain a higher operating oil temperature, it is permissible to lag the oil sump with waterglass and flake asbestos or some similar material, which will keep the cold air off the sump and hold the heat in. A material thickness of 1/16 to 1/8 is satisfactory for this lagging.
c. The cowl air inlet opening, the first opening under the propeller hub, should be closed. Piper Part No. 73951 is a cover plate for this opening.
d. In order to insure the highest possible carburetor heat rise, the flat plate valve in the carburetor air box should be checked to see if it is seating properly. This can be done easily by removing the air filter and observing the top edge of the valve, with the heat on. The valve should seat flush with the top of the box, with absolutely no air gap.
e. The tailpipe shroud assembly (Part No. 70912) can be lagged with asbestos or some similar fireproof material. The recommended thickness of this material is approximately 1/16.
f. The flexible tube which runs from the tailpipe shroud to the carburetor air box can also be lagged with the same material as used on the tailpipe shroud.
g. See Figure 1 right
2. All J3C-65 airplanes, with muffler installations, serial numbers 15396 and up.
All items A thru G above apply plus
the following:
h. A stainless steel or aluminum ring can be placed against the bottom of the last tailpipe shroud spacer. This will close off the hot air bleed between
the tailpipe and tailpipe shroud.
Piper Service Bulletin Number 84 Winterization of J3C-65
It has been brought to our attention that, in extreme cold weather operation, the J3C-65 has been giving some trouble due to cold engine operating temperatures. In order to eliminate this hazard and insure better engine operating temperatures, it is considered satisfactory to follow the procedure set forth below. It is suggested that these procedures be followed in temperatures of 40º F or below.
1. All J3C-65 airplanes, with muffler installation, up to serial number 15396.
a. The aluminum breather tube (Part No. 84332) can be lagged with 1/16 to 1/8 felt or some similar material, which should extend all the way to the bottom of the tube. This lagging will help eliminate the possibility of condensation freezing in the tube.
b. To obtain a higher operating oil temperature, it is permissible to lag the oil sump with waterglass and flake asbestos or some similar material, which will keep the cold air off the sump and hold the heat in. A material thickness of 1/16 to 1/8 is satisfactory for this lagging.
c. The cowl air inlet opening, the first opening under the propeller hub, should be closed. Piper Part No. 73951 is a cover plate for this opening.
d. In order to insure the highest possible carburetor heat rise, the flat plate valve in the carburetor air box should be checked to see if it is seating properly. This can be done easily by removing the air filter and observing the top edge of the valve, with the heat on. The valve should seat flush with the top of the box, with absolutely no air gap.
e. The tailpipe shroud assembly (Part No. 70912) can be lagged with asbestos or some similar fireproof material. The recommended thickness of this material is approximately 1/16.
f. The flexible tube which runs from the tailpipe shroud to the carburetor air box can also be lagged with the same material as used on the tailpipe shroud.
g. See Figure 1 right
2. All J3C-65 airplanes, with muffler installations, serial numbers 15396 and up.
All items A thru G above apply plus
the following:
h. A stainless steel or aluminum ring can be placed against the bottom of the last tailpipe shroud spacer. This will close off the hot air bleed between
the tailpipe and tailpipe shroud.
