The Ford Barn - View Single Post - Why do I have to keep pulling the choke out ?

40-A Twins · 11-14-2020, 11:40 PM

The engine is now completely disassembled on the garage floor for examination.
Valves / guides are worn.
Camshaft has a round lobe between #2 & #3, so it must be a "B" cam.
Pistons & rings appear to be new.
Main & rod shim stacks are approx. .030, so this motor saw very little use after bearings were rebabbited.
Motor serial number prefix is "LB", and the raised boss is still in as cast condition, so this serial number does not appear to be a re-number.
I plan to replace valves, guides, lifters, & springs. Original style and "Modern valve set up" kits are offered by Bratton's. Is there an advantage to using Modern valves over the original? Also gasket sets are available with "Modern head gasket". Does this seal better than original copper type head gasket ?
Any good tips to reduce oil seepage where the main bearing bolts penetrate the crank case ?

11-14-2020, 11:40 PM	#35
40-A Twins Senior Member Join Date: Oct 2020 Location: Oregon City, OR Posts: 121	Re: Why do I have to keep pulling the choke out ? The engine is now completely disassembled on the garage floor for examination. Valves / guides are worn. Camshaft has a round lobe between #2 & #3, so it must be a "B" cam. Pistons & rings appear to be new. Main & rod shim stacks are approx. .030, so this motor saw very little use after bearings were rebabbited. Motor serial number prefix is "LB", and the raised boss is still in as cast condition, so this serial number does not appear to be a re-number. I plan to replace valves, guides, lifters, & springs. Original style and "Modern valve set up" kits are offered by Bratton's. Is there an advantage to using Modern valves over the original? Also gasket sets are available with "Modern head gasket". Does this seal better than original copper type head gasket ? Any good tips to reduce oil seepage where the main bearing bolts penetrate the crank case ?