How To Set Camshaft Timing
When information technology comes to rebuilding four-stroke engines, getting the pocket-size details correct can often mean the difference betwixt a long-lasting, powerful engine and an engine destined to have a brusk life. JE Pistons has decades of experience designing, applied science, and testing pistons for loftier-performance four-stroke engines. Though at that place are many technical details in a four-stroke'south performance, cam timing is one of the most critical points to get right after freshening upward your meridian end. We'll walk through all the of import details that should exist considered when timing the engine, and provide helpful tips to ensure that you get the job washed correct. As the name implies, the root of all cam timing related engine build issues typically stems from ane key relationship, which is the position of the crankshaft relative to the position of the camshaft(s). Deviations from the factory prescribed positions can effect in lost engine performance, which is a small issue compared to the possibility of catastrophic engine failures, which are a possibility, since improperly timed cams can result in valve to piston contact. To tackle setting the cam timing correctly, the manufacturing plant service manual must be utilized. The service manual is the merely place you'll find detailed information prescribing the right procedure. Before starting the job, take some time to thoroughly review the steps outlined in your manual. All cam timing procedures usually outset with rotating the crankshaft to a prescribed position. The specific steps to practise this will vary depending on the engine, however, the importance of getting this part correct cannot exist stressed enough. Often times, small markings will take to be aligned with features internal to the engine, or on ane of its covers. Be sure to utilize ample light when adjustment the crankshaft. Also, make sure that yous're looking squarely at the alignment feature. Viewing the alignment features at an bending tin can atomic number 82 to an inaccurate positioning of the crankshaft. Looking for a new piston for your clay bicycle or ATV? Bank check out our Pro Series pistons. With the crankshaft positioned, the next step on engines utilizing cam chains is to wrap the chain around the cam, or cams, while simultaneously ensuring the cams are in the correct position. While doing this, the crankshaft must also stay in its original position! Engines with gear driven cams are typically a footling easier to work with because ensuring the gears are correctly aligned is the only concern. The cam gears volition characteristic some type of alignment marker, such as a scribed line or dimpled dot. Depending on the engine, these features will need to be aligned with a mating feature on the engine. For example, it is not uncommon to marshal the cam gear mating feature with the cylinder head cover aeroplane. On engines utilizing a cam chain, the way in which the chain is wrapped around the cam gear(s) is important. Ensuring there is no slack in the chain when it is wrapped around the cam gear is critical. We desire all the chain slack to be on the side of the engine where the chain tensioner resides. That being said, on engines utilizing two cams, it is best to install the cam furthest from the chain tensioner first. Pull the chain taught from the crankshaft, then advisedly slip the cam gear into position, ensuring both the crank position and cam gear position are aligned with their respective mating features. On dual cam engines, once the first cam has been installed, the chain can be pulled taught from the first cam, and the second cam and gear can be slipped into position and oriented correctly. At this point, the position of the cam(s) and crank should be double checked. On engines utilizing cam bondage and ii cams, some service manuals will specify a chain link or chain pin count between the indexing feature of the intake and exhaust cam, in addition to the alignment features on the cam gears themselves. On gear driven engines, this will simply be a thing of checking the alignment features of all the gears in the system. In one case the cams have been correctly positioned, the cam cap can be reinstalled, and the valve clearances can be checked. After any valve clearance adjustments have been carried out, the final step on engines utilizing a cam chain is to fix the chain tension. A couple dissimilar types of concatenation tensioners are commonly used, however, regardless of type, installing the chain tensioner in its retracted position is incredibly important. Consult your service manual for specific instructions on retracting the chain tensioner. Keep to install the chain tensioner on the engine. Once installed, follow any necessary steps required to extend the chain tensioner and tension the chain. With the concatenation tensioner extended, the cam chain will have some tension on it, however, information technology may not be in its optimal position. Proceed to rotate the engine through four crankshaft revolutions. Rotating the engine over will allow the chain tensioner to further tension the chain. It volition also serve as an opportunity to confirm that everything has been fix then that at a minimum, there are no mechanical interferences. If yous're unable to rotate the engine through all four of its strokes, there is a stiff possibility that the timing has been set incorrectly and that the valves are interfering with the piston. Assuming the initial spin over of the engine went without upshot, ostend one final time that all key relationships have been maintained. Reposition the crankshaft in accordance with its alignment feature. Double check that the cam(s) are aligned with their respective features. Once this has been done, the difficult part of the job is complete, and we can walk away with confidence that the cam timing has been fix correctly.
Source: https://powersports.jepistons.com/blog/setting-cam-timing-four-stroke-motorcycle
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