Cylinder and head stuff.

Having stripped the engine completely, I had a good look at all the parts.

The bore was fine and I did a very light hone. Similarly, the piston, con rod and both bearing surfaces were OK.

The rings looked OK but given the smoky history, I replaced them just in case making sure that the gaps were staggered away from the valves.

The head was in good nick but very coked up so it got soaked in cleaner and tidied up.

The valves also looked OK and after cleaning the faces I did a light paste grind with them in situ by using a spring compressor. I checked the tolerances on reassembly. A new head gasket and all was done.

Engine torque settings are as follows -

Head bolts 22.5Nm
Con rod bearing cap 11.5Nm
Flywheel nut 54Nm

Valve clearance is 0.10mm to 0.20mm

A few pictures -

[Linked Image]

Lining up the marks for the static timing.

[Linked Image]

Smooth bore, ground and reset valves.

[Linked Image]

Slightly scuffed piston with new rings. I'm sure it'll be OK.

[Linked Image]

Piston ready for reinstallation.

[Linked Image]

Head bolt tightening sequence.

Timing is next,
Chris

Shed troglodyte

2HP Kirby-Tecumseh Scott Bonnar 45 (14" cylinder)
2HP Briggs & Stratton Morrison 350BD (14" cylinder)
3HP Briggs & Stratton Rover (17" rotary)