Friday, Jan 25, 2013 at 22:28
IronJosh
Diesel dilution occurs when the diesel injected into the cylinder hits the cylinder wall above the rings as the piston rises. Some of this isn't burnt.
The pressure of combustion forces the small amount of fuel trapped beside the piston crown and on the cylinder wall down past the rings.
This amount is not very much, but when it happens thousands of times a minute for hours of tootling around, then the diesel builds up in the sump and raises the oil to a false level. Usually as a result of lots of stop start driving around town.
Unfortunately, this is also thinning the oil as diesel is thinner than oil.
If anyone can explain how a 1HZ takes along time to drain I am very interested in the theories. To me apart from the cavities for the buckets in the head which stay full anyway and the oil gall galleries which are an engine length of garden hose in volume, where is all this oil coming from?
PS How far down does the dip stick tube go in a 1HZ, does it stop above the oil level OR go below the oil level?
Ross M
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