Does the camshaft drive the fuel pump?

A mechanical fuel pump is driven by the camshaft , or by a special shaft driven by the crankshaft . As the shaft turns, a cam passes under a pivoted lever and forces it up at one end. When the lever pulls the diaphragm down, it creates suction that draws fuel along the fuel pipe into the pump through a one-way valve .

For what purpose is the high pressure fuel pump timed to the crankshaft or camshaft?

To get 1 open/close cycle of the valves per 2 up/down cycles of the piston, you need the camshaft to turn at half the speed of the crankshaft. A high pressure pump used in common rail systems, such as a Bosch CP3, is capable of lifting it’s own fuel out of the tank.

How camshaft is connected to crankshaft?

Camshaft and crankshaft gears are connected by a timing chain (similar to a bicycle chain) or timing belt (similar to a drive belt, but with teeth), or are a mesh gear set (two interlocking gears) located in the “front end” of an engine.

What is the purpose of a diesel engine camshaft?

A camshaft acts as a timing device that controls the opening and closing of the intake and exhaust valves, as well as setting the valve overlap that occurs at the top dead centre on the exhaust stroke. The shaft is constructed with several journals that ride on bearings within the engine.

Why is my mechanical fuel pump not working?

If you see a weak stream or nothing at all, then you could have a failed pump, a blocked fuel line, a clogged fuel filter, or an empty gas tank. Check the fuel pump pressure. Attach a fuel pressure gauge either to the fuel line at the carburetor or to the pump outlet then crank the engine.

Why does a fuel pump need to be timed?

The timing of the pump determines when it will inject fuel into the cylinder as the piston reaches the BTDC point.

Does the crankshaft turn the camshaft?

Let’s break it down. The crankshaft spins and this spinning turns the timing belt or chain, which rotates your camshaft. This is your rotational motion. Your camshaft takes all this rotational motion and uses it to repeatedly raise and lower your engine’s intake and exhaust valves.

Is a cam and camshaft the same?

is that cam is a turning or sliding piece which imparts motion to a rod, lever or block brought into sliding or rolling contact with it or cam can be (informal) camera while camshaft is a shaft fitted with cams; especially one in a piston engine that activates the valves.

What is cam shaft in engine?

camshaft, in internal-combustion engines, rotating shaft with attached disks of irregular shape (the cams), which actuate the intake and exhaust valves of the cylinders. A separate camshaft for each row of cylinders is driven by gears or chains from the crankshaft.

How do fuel pumps work on a camshaft?

Fuel Pumps and Exhaust Valves are operated by Camshaft, driven from Crankshaft, by a roller chain [main] running over each sprocket wheel, being bolted to both shafts. Chain should wrap around at least 120°on both sprockets.

What is the relationship between the camshaft and the crankshaft?

The relationship between the rotation of the camshaft and the rotation of the crankshaft is of critical importance. Since the valves control the flow of the air/fuel mixture intake and exhaust gases, they must be opened and closed at the appropriate time during the stroke of the piston.

How does a crankshaft drive a car engine?

The Crankshaft drives through a belt or chain drive the camshaft on which the inlet, exhaust, fuel pump cams are fitted for each unit when the crankshaft rotates it, in turn, rotates the camshaft which precisely actuates the valve and fuel pumps.

What is the recommended end play for a camshaft?

Camshaft end play. Some engines have a thrust plate to control the forward and backward movement of the cam. The recommended end play on these types of engines is between .003″ to .008″. Many factors may cause this end play to be changed.