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This site was last updated on February 15, 2008.
Preparation
The Cyclon PC6 engine and tools. The necessary tools are:
- Depth Micrometer,
- 2.5 mm Allen wrench,
- 3/8" hex socket, and
- Cyclon head removal tool
Backplate
The Cyclon PC6 2-piece backplate. The "case-stuffer" attaches to the threaded backplate via a 3mm allen bolt.
Backplate
This is how the backplate looks outside the engine. Note the circular groove in the case stuffer. The piston skirt fits precisely into this groove at the bottom of the stroke. As a result, the backplate must be removed with the piston near the top of its stroke.
View from Rear
With the backplate removed, the crankshaft and connecting rod are clearly visible. Note the "V"- shaped channels in the back of the crank for improved fuel flow.
View from Front
The engine employs a front bearing retainer to hold the front bearing in place and shroud it from dirt. This retainer has reversed threads. Remove it by placing a thin bar of metal in the slot and turning clockwise.
Bearing Retainer
This is how the front bearing retainer looks after it is removed from the engine.
One-Piece Head
The PC6 has a one-piece head that threads into the case. Always be sure to check your head clearance when reassembling your engine. Three sizes of head chamber are available.
Piston and Rod
The lower end of the rod has a somewhat unconventional shape, presumably designed to help scoop fuel into the two oil holes for lubricating the crank pin/rod bushing assembly.
Piston with Backplate
These photos show how the piston skirt fits into the circular groove in the case-stuffer.
AAC Cylinder
A curious feature of this engine is that nearly all of the porting is machined into the liner itself. It makes for a very mean looking liner.
Empty Case
Note the smooth interior of the case, lacking nearly all porting. The exhaust port is visible, as are two small channels at the very bottom that help fuel flow into the ports in the liner.
Crankshaft
Not much to report here. It rotates, quickly we hope.
Main Bearing
It exists.