- Joined
- Apr 23, 2011
- Messages
- 2,476
Picked up a petrol driven, 3 cyl compressor at a clearing sale last week. Honda 6.5 HP motor, (runs fine, no load). Compressor,...... so so. #2 cylinder has some corrosion pitting but otherwise seems ok #1 & #3 seem pretty good. I didnt run the compressor under power. Stripped it all down, new bearings and seals, new gaskets. Old rings, pistons etc. Most of the parts are there, (or here), depending on your point of view, or level of optimism I guess.
The flange that contains a crankshaft main bearing has a threaded hole for, presumably, a crankcase vent?
The inlet areas of the cylinder heads have a small poppet that acts directly on the inlet valve to operate as, presumably, an unloader valve. These were connected via the black plastic tubing to the petrol motor, and presumably each cylinder and thence to the receiver. However, there are 2 options at the receiver. 1 might be to the 1/4 turn ball valve, or it perhaps might go to the "safety valve". The 1/4 turn valve also connects directly to the air coming from the cylinders, but has a spring operated valve within it before the receiver. The "safety valve" has an odd threaded outlet. Neither of these items had the neccessary fitting to connect the plastic tubing to it. Either of these would appear to perform the same function, when the pressure is high enough within the plastic tubing the poppet valves force the inlet valves to open and decellerate the motor.
At the other end of the receiver is a pressure gauge, and another "safety valve" albeit, much smaller, and non-adjustable.
The other end of the the plastic tubing was connected to a fitting on the petrol motor. This fitting contains a spring loaded lever that pulls the the throttle open, but when pressurised forces the throttle lever to idle.
So I guess I'm asking the collective here, do I have it all screwed up. Or am I on the right track. I know I need something to screw into the "crankcase vent". + another poppet for the unloader valve on #3 cylinder.
The lack of a decent sized air supply outlet is a mystery also. The receiver inlet is 1 1/4", the fitting beside it is 3/4". The 3 fittings at the other end are only 1/4"
Cheers Phil
The flange that contains a crankshaft main bearing has a threaded hole for, presumably, a crankcase vent?
The inlet areas of the cylinder heads have a small poppet that acts directly on the inlet valve to operate as, presumably, an unloader valve. These were connected via the black plastic tubing to the petrol motor, and presumably each cylinder and thence to the receiver. However, there are 2 options at the receiver. 1 might be to the 1/4 turn ball valve, or it perhaps might go to the "safety valve". The 1/4 turn valve also connects directly to the air coming from the cylinders, but has a spring operated valve within it before the receiver. The "safety valve" has an odd threaded outlet. Neither of these items had the neccessary fitting to connect the plastic tubing to it. Either of these would appear to perform the same function, when the pressure is high enough within the plastic tubing the poppet valves force the inlet valves to open and decellerate the motor.
At the other end of the receiver is a pressure gauge, and another "safety valve" albeit, much smaller, and non-adjustable.
The other end of the the plastic tubing was connected to a fitting on the petrol motor. This fitting contains a spring loaded lever that pulls the the throttle open, but when pressurised forces the throttle lever to idle.
So I guess I'm asking the collective here, do I have it all screwed up. Or am I on the right track. I know I need something to screw into the "crankcase vent". + another poppet for the unloader valve on #3 cylinder.
The lack of a decent sized air supply outlet is a mystery also. The receiver inlet is 1 1/4", the fitting beside it is 3/4". The 3 fittings at the other end are only 1/4"
Cheers Phil