Prep of head for casting- adding fillets in deep recesses and core prints
Locating core features relative to original head. Black lines were traced from original head and 1-2-3 blocks. Combustion chamber centered then "arms" adjusted for alignment.
Core pattern- side view
HEad prep cont'd. Need detail on valve guide prints and additional sanding + fill
Fuel mixer with cores-need to build up gas connection with bondo.
The air passage will be filled and hogged out of the finished casting rather than making a separate core box.
Filling in the rust spots to use the head as a pattern.
Later OHV model B- 1905??
Model B base with OHV
2 flywheel transitional engine- this base and cylinder gets the OHV setup shown in pix #1,
Early hot head "free air" model B- single flywheel.
Governor detail of early Model B
Core box detail of combustion chamber with exhaust passage (top) , intake (lower right) and ignitor (lower left).
Core box showing exhaust passage and valve guide core. Exhaust passage master pattern in lower left.
Core box detail. Core print on intake shown on head used as pattern.
Core box, corebox passage pattern and head used as outdide pattern with core prints inserted.
Raw casting from the foundry on right.
what came out of the sand
Valve pockets to be machined. You can see a bit of core shift (combustion chamber) to the top left on the cast part.
Rotary table used to machine the hot tube support and compression release. Did the 1-1/4 tap for the exhaust and the intake mixer by rotating to top position.
Beginning to machine the intake mixer chest.
Cutting the valve seats with a 45-degree boring bar.
Finished head- bottom view.
Original hot tube support. Rocker support and push rod clevis. Lots of work, but it turned out AOK.
Head assembly complete. Still some final finish grinding to do.
Had to cut up a good hot tube chimney to get the top piece shown.
The mixer assembly completion was very rewarding. The cap on the mixer top was a ~2"-14 tpi male/female thread. My first large internal thread. These engines are a 3-valve setup. One for the exhust, one for intke and one for the mixer. Only the exhaust valve is driven by the cam.
Rocker came out nice with the part number script. The valves are cast iron faces welded onto drill rod stems.
Governer side bearing cast "en-bloc". The aluminum mandrel and shoulder piece locate on the side cover bearing which was poured and finished on a lathe.
Poured bearing shells on rod. They'll look a lot better when machined. The rods were tinned to stick the babbitt to them.
Baring cast "en-bloc" with an 0.080" raised shoulder for the cam pinion to ride against.
Bearing poured and bored to size. After the edges were radiussed and the oil swipes were cut it fit spot on. The crank journal was ground so it made the fitting much easier.
Setup to align the lower rods bearing parallel to the wrist pin. Myricks used a pinch bolt to adjust the wrist pin play/clearance.