What does exhaust camshaft do?

Valves must open and close at specific intervals in relation to cylinder position. For example, as cylinder #1 is coming to top dead center (TDC) on the exhaust stroke, the camshaft is opening the intake valves and closing the exhaust valves.

What is the camshaft connected to?

A camshaft on an internal combustion heat engine is a device that controls both the input of fuel and the expulsion of exhaust fumes. It consists of several radial cams, each displacing intake or exhaust valves. This camshaft is connected to the crankshaft via belt, chain or gears.

What happens when the camshaft breaks?

When a camshaft breaks, the components around it are also at risk of damage. The parts most vulnerable to damage are those located inside of your vehicle’s engine. These include the other valvetrain components, the crankshaft, cylinder block, cylinder head, pistons, and connecting rods.

At what stage are both valves of an engine closed?

During intake stroke, the intake valve is open and the exhaust is valve closed. During the compression stroke the intake and exhaust valves are closed. During the ignition stroke the intake and exhaust valves are closed.

What is the relationship between crankshaft and camshaft?

A camshaft uses egg-shaped “cams” to open and close engine valves (one cam per valve), while a crankshaft converts “cranks” (the up/down motion of the pistons) to rotational motion.

Where is the camshaft located on a single cylinder engine?

In modern overhead-cam (OHC) engines, the camshaft is located in the cylinder head. Single OHC (SOHC) engines have one cam per bank, usually mounted between the valve stems. Rocker arms transmit SOHC movement to the valves.

What is the distance specification from intake camshaft to cam cover?

The distance specification from intake camshaft to the mark on the cam cover is 61 – 64 mm. If timing is off, the timing chain is stretched and should be replaced. In addition: If timing is off by as much as one whole sprocket tooth, it indicates that the chain jumped timing and may have caused valve / piston interference.

What should the camshaft adjustment be at idle?

With the engine at idle, intake camshaft adjustment specified and actual should be within +5 degrees or -5 degrees. Any larger value indicates a timing chain that is dangerously stretched.

How many valves are in a single cam engine?

Overhead-cam engines have three to five valves per cylinder, but usually two intake valves and two exhaust valves. Older engines and a few newer “pushrod” engines have a single camshaft in the cylinder block. Long metal pushrods transmit camshaft movement to the rocker arms, which transmit that movement to the valves.