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[rwahlgren]

How to seal the crankcase.

Coat parting surfaces of crankcase upper and lower halves with Titeseal.
Lay a piece of No. 50 silk thread from end to end along each side, inside the studs, of the upper half.




What to use on the main bearings for assembly lube?

Oil main bearings in upper crankcase half liberally with engine oil, SAE No. 70.


Crankshaft - The crankshaft is a conventional six throw, counter-balanced, seven bearing type, made of chrome-nickel-molybdenum steel.
The counter weights are welded to the steel forging resulting in a compact design. Main journals and crankpins are hollow. Removable alloy end plugs in each journal and crankpin, with tubes joining the journals and crankpins, provide a passage for oil. Removal of the plugs permits access to foreign material, etc., possibly collected inside the crankshaft.
A pendulum type dynamic balancer, attached to a splined hub bolted to the crankshaft rear flange, drives the splined outer shaft of the vibration damper which, through the flexible quill shaft and hydraulic medium, drives the damper inner (flexible) shaft. The dynamic balancer minimizes the effect of two-node high frequency crankshaft torsional vibrations. The vibration damper, with its inner and outer shafts reacting against each other due to the flexible quill shaft and internal hydraulic medium, minimizes single-node low frequency torsional vibrations. An internally splined coupling bolted to the crankshaft front flange provides the drive connection for the reduction gear unit.


Some specifications
Bore 5.5 Stroke 6.0
CR 6.65 to 1
Oil pressure desired in flight 60-70 psi
Engine oil for summer 1120
Engine oil for winter 1100
Coolant temperature desired in flight 121 deg C, 250 deg F.
Engine weight F model 1305 lbs
Spark plugs
AC LS 85
Champion C 34 S
BG LS 321
Aero LS 3AD
Spark plug gap .011 - .014 inches
Intake valve clearance .015
Exhaust valve clearance .020