Re: Draining Engine Oil
Posted: Sat Feb 02, 2019 7:29 pm
Ive been asked to provide some images of cylinder blocks that are drilled for oil draining from the camshaft gallery..unfortunately I cannot do this.. interface between camera and computer is broken and Im told the hard drive is on the blink..furthermore, when it was all working my computer has too many pixels and I'm not knowledgeable enough to resolve this alone.
Best I can do is describe what is done :- some blocks (mostly later.. but I do have one from late 1965 that is drilled..it had ONE rebuild in late 1970s ..the person who did that rebuild did not drill anything..claims cylinder block as it was when he aquired the car @apprex 70 k miles ..he was 2nd owner:- Ex Netherlands market car with full history) Ive seen several later blocks ( from V8250 saloons) that are also drilled.. I also have a very late un numbered block that is NOT drilled and also has no flats machined on the camshaft jpurnals like all others Ive seen.(not fully sure but it might have been ex marine application.. block was a light metallic green in colour when I aquired it) .
the drilled blocks have a series of holes at the lower part of the cam gallery either side of the central web ..these holes are approx 1/8" diameter and either 4 per side (placed approx 1' in front of the side webs.. none in the very front between the narrowest webs) or 7 per side on later blocks ..in which case there are 2 holes between the wider spaced central webs..and just one at the rear either side.
Its really self explanatory.. not sure if it really helps much..but it does allow almost all of the oil to drain out when changing oil in normal manner.. Id suspect these holes are highly likely to get blocked up if the engine is not serviced frequently.. they do seem to accrue a LOT of black crud over the years.. more so than many contemporary engines..
Best I can do is describe what is done :- some blocks (mostly later.. but I do have one from late 1965 that is drilled..it had ONE rebuild in late 1970s ..the person who did that rebuild did not drill anything..claims cylinder block as it was when he aquired the car @apprex 70 k miles ..he was 2nd owner:- Ex Netherlands market car with full history) Ive seen several later blocks ( from V8250 saloons) that are also drilled.. I also have a very late un numbered block that is NOT drilled and also has no flats machined on the camshaft jpurnals like all others Ive seen.(not fully sure but it might have been ex marine application.. block was a light metallic green in colour when I aquired it) .
the drilled blocks have a series of holes at the lower part of the cam gallery either side of the central web ..these holes are approx 1/8" diameter and either 4 per side (placed approx 1' in front of the side webs.. none in the very front between the narrowest webs) or 7 per side on later blocks ..in which case there are 2 holes between the wider spaced central webs..and just one at the rear either side.
Its really self explanatory.. not sure if it really helps much..but it does allow almost all of the oil to drain out when changing oil in normal manner.. Id suspect these holes are highly likely to get blocked up if the engine is not serviced frequently.. they do seem to accrue a LOT of black crud over the years.. more so than many contemporary engines..