Why does a Harley Davidson engine use timed breathing?
HARLEY engines (excluding early engines with total loss oil systems) manufactured up until 1999 used some form of timed breathing to scavenge oil from the crankcase and deliver it to the vicinity of the return oil pump so that it could be sent back to the oil tank.
How does a Harley Davidson engine get remanufactured?
Usually the engines are shipped with no oil. The dealership should drain all fluids before shipping. The VIN on the old crankcase is destroyed, and the customer’s original VIN will be stamped on a new crankcase when the reman engine is assembled. Oil pump gears are checked for clearance, fit, and cracks. This is a cool process.
How does oil scavenging work on a Harley Davidson?
When the pistons change direction and begin travelling back up the cylinders, a vacuum is created in the crankcase which causes the reeds to close, preventing air from entering the crankcase. The effect is that a slight vacuum is maintained in the crankcase and oil scavenging is greatly improved.
Is the oil pump the same on a Harley Davidson?
Harley oil pumps have basically stayed the same since 1936. These gears drive off the pinion shaft, picking up oil and sending it on its way throughout the engine-a simple but delicate operation. “The following pump parts are refurbished and/or inspected and reused if they meet our specifications,” said Scott Miller.
HARLEY engines (excluding early engines with total loss oil systems) manufactured up until 1999 used some form of timed breathing to scavenge oil from the crankcase and deliver it to the vicinity of the return oil pump so that it could be sent back to the oil tank.
When the pistons change direction and begin travelling back up the cylinders, a vacuum is created in the crankcase which causes the reeds to close, preventing air from entering the crankcase. The effect is that a slight vacuum is maintained in the crankcase and oil scavenging is greatly improved.
Where to get parts for a Harley Davidson Evo?
Get a shop manual for your year and model of evolution and read it. For now go to Bandit.com and follow their directions to register your EVO for their parts book. This will get you into looking at copies of Harley parts books for your year. Go to engine and oil pump and you will find the tappet screen and where it is.
When do you need a new oil pump on a Harley Davidson?
The minute your Harley-Davidson oil pump stops working is when you’ll need a new engine. That’s why your next Harley oil pump replacement should come from J&P. All our Harley-Davidson oil pumps are precision made by manufacturers you can trust; like S&S, JIMS, V-Twin Manufacturing, Feuling, Twin Power, and more.