The camshaft controls the intake and exhaust valves of an internal combustion engine, regulating the four strokes (Intake, Compression, Power, and Exhaust) of the ignition process. The camshaft is sequenced to rotate at 1/2 half the speed of the crankshaft, and all camshafts must be properly "timed" or severe engine damage could occur. Installing camshafts is advanced engine work, but you can learn to approach the job as safely as possible for your make and model, and some general tips on getting the job done correctly.

1,Check the user's manual for your vehicle for specific diagrams.

Engine assemblies vary drastically from make to make and model to model, so it's impossible to offer a generalized guide for installing every camshaft. For this reason, it's important to invest in a Haynes guide, or another official user's manual with rebuild schematics specific to your make and model.

• It's possible to seriously damage your engine and wreck the timing if you don't use a detailed manual for this job. Read on only for a general description of the steps of the process.

2,Determine whether or not you need to pull the entire engine.

To access the crankshaft compartment, you may have to pull the entire engine, depending on the type of engine and the make of the vehicle. Overhead Camshaft (OHC) engines are much easier to access than Overhead Valve (OHV) type engines, with the camshaft centered in an engine block.

• Most American-made V8 and V6 engines use in-block camshafts, which means you may have to pull the engine out to do the swap.[1]

• Many engines using overhead camshaft configuration actually have multiple camshafts, such as a Dual Overhead Camshaft (DOHC). If you have a DOHC engine which is also a "V" configuration it is possible to have as many as 4 camshafts.

3, Access the camshaft.

Removing the timing cover is one of the most difficult parts of an in-car installation, if you're going to attempt it without pulling the engine. The oil pan must be lowered enough to remove the timing cover while also clearing the crankshaft snout. With the cover off the engine, remove the three upper timing-chain bolts, along with the lower timing gear if a new timing chain is to be installed. This process will vary, depending on your make and model, but generally you'll have to start by disconnecting the battery lines, then removing the radiator cap and releasing the valve under the passenger's side to drain it.

• Once the coolant is drained and the accessories are out of the way, remove the intake-manifold bolts. A small hammer and chisel or flat-head screwdriver may be needed to pry the intake manifold from the engine block. Scrape the front and rear block rails clean of cork, silicone, oil, or any other gunk, if necessary.

4, Remove the valve covers.

This will allow you to access the rockers, pushrods, and lifters. Keep the rockers and pushrods in order. While you remove the rocker nuts, the engine may have to be turned over a few times in order to take valve spring pressure away from certain rocker-to-valve stem contact points.

• Remove the Mass Air Flow (MAF) and Intake Air Temperature (IAT) sensor assembly, if necessary. Unbolt the radiator tray and remove it. Unbolt and detach the Manifold Air Temperature (MAT) tubes from the manifold.

• Remove the spark plug wires, disconnecting the wiring harness leading to the coil packs and remove the coil packs from the valve covers. Detach the hoses from the valve covers and remove the valve covers to access the crankshaft.

5, Rotate the cam and mark Top Dead Center (TDC).

Turn the camshaft wheel until you see the V-shaped timing mark at the top. If these timing marks are not aligned properly during assembly, the camshaft will be out of phase with the crankshaft and the valves may be damaged if they strike the pistons.

• If you need to adjust the timing afterward, you'll be able to make specific tweaks, but it's still good to make sure you've got the mark recorded so you can install the cam safely.

6, Remove the old cam.

Though using a camshaft removal tool is ideal, if your budget is tight you can work the cam out of the engine block by twisting it slowly and carefully, taking precaution not to scratch or gall the bearings.

• If you want to change the timing wheel, chain, or any other components in the assembly, you'll also want to remove these, correspondingly.

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