A new design for '69. A real beauty.
Cooling fins on the lower cases are part of the Series II wet sump engine design.
Royal Enfield advertising touted the craftsmanship and performance of the Interceptor that set it apart from other makes. Several of these features were found in the crankcase; a dynamically balanced crankshaft, camshafts that could be swapped without splitting the cases, and wired connecting rod bolts clamping numbered rods and caps together. An optional oil cooler was designed to reduce engine temperature under heavy use. A great idea for an air cooled twin. The Interceptor was a premium motorcycle.
Semi-unit gearbox and engine design. The Albion transmission is bolted directly to the the engine.
A mechanical marvel with a mile long chain.
Readily removable camshafts for the race tuner.
The plunger oil pump....very unlike my A65 BSA's.
The engine tear down offered no surprises except for an aluminum chip which was found in the oil sump. It appears to be casting flash. The cases were difficult to separate which was caused by rusty location dowels holding them together. I worked gingerly with a wood clamp, a screwdriver, popsicle sticks, and a pine block. PB blaster, my old friend, loosened gaskets and dowels up a bit. Great care was taken not to mar the castings. After the cases were separated it was on to inspecting the internal bits. Although in need of rebuilding, no significant problems were found.
Using a reversed wood clamp and several other tools to open the cases.
Getting there.....soaking in solvent for a bit.
Inside the cases...things look pretty good.
Rusty dowels made splitting the cases difficult.
The neat bits inside....wired connecting rod bolts speak performance to me.
Numbered rods and caps show an attention to detail.
The manual calls for 1/16 inch spacing on the timing side bearing .....as measured is pretty close.
Time to clean, inspect, and rebuild the crankshaft.
A follow up to my last post. Another photo taken while "Grandpa Ken" was on an extended trip across the pond in the early 40's.