Posted by scott56 [162.158.106.229] on Friday, December 04, 2020 at 11:47:59 :
In Reply to: Re: craink oil sling posted by jay massy [162.158.255.45] on Friday, December 04, 2020 at 11:09:35 :
from Some Thoughts On MoPar Flatheads - By Dave Erb
Timing Chain/Gear Lubrication
Engines built before 1951 use a pressurized oil nozzle of about 1/16-inch diameter to lubricate the timing chain and components. This tube protrudes from the block above the center of the crankshaft gear and points downward, and has a small bracket attached by one screw to the front of the block. The oil is sourced from the front oil passage leading from the main galley on the left side of the block to the front camshaft bearing.
This system provides positive lubrication to timing components and is very nice . . . . . . as long as it stays clean and free from sludge. It was abandoned in later production in favor of an oil slinger disc placed behind the crankshaft timing gear that supposedly slung oil up and onto the chain. Since the slinger lives above the normal oil level in the oil pan, it can operate only when the engine is running. In this writer’s humble opinion, the earlier pressurized system was far superior, and was discontinued only because of the poor quality oil available at the time and the difficulty in getting the block hot enough for this oil component to get warm enough to keep sludge from forming. It would be interesting to compare timing chain wear between two otherwise identical engines, to observe which of the two systems really provides best lubrication and least wear.
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