Estimating timing chain wear
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As mentioned earlier, wear to the timing set retards the cam and ignition timing. The ignition timing can be corrected by adjusting the distributor using a timing light, but the cam timing error cannot be corrected without disassembly. At that point it would be much better to simply replace the timing set instead of correcting for the wear by using bushings or different keyways, etc. | As mentioned earlier, wear to the timing set retards the cam and ignition timing. The ignition timing can be corrected by adjusting the distributor using a timing light, but the cam timing error cannot be corrected without disassembly. At that point it would be much better to simply replace the timing set instead of correcting for the wear by using bushings or different keyways, etc. | ||
| + | ==Checking for "jumped timing"== | ||
| + | To check for jumped timing: | ||
| + | • If the distributor was moved, put it back to where it was when the engine was running correctly. | ||
| + | • Take the plugs out so the engine is easy to turn over by using a socket on the damper bolt. | ||
| + | • Bring the line on the damper to TDC on the timing tab. | ||
| + | • Remove the distributor cap and note where the rotor is pointing- on a V8 it should be close to either #1 or #6. If it isn't, the timing has jumped, providing the timing marks are correct. | ||
==Timing set types== | ==Timing set types== | ||
===Gear drive=== | ===Gear drive=== | ||
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In the majority of cases, installing the cam "straight up" (without any advance/retard added by the installer) is the correct way to install the cam and timing set. Many cam makers have already advanced (in most cases) the cam timing when the cam was made, to suit the application. Unless the builder has access to an engine dynamometer or has advanced knowledge of the dynamics involved, advancing/retarding a cam is nothing but a shot in the dark as to whether it will result in any benefits at all. And there's the chance the engine output could be adversely affected by indiscriminately changing the phasing of the cam. | In the majority of cases, installing the cam "straight up" (without any advance/retard added by the installer) is the correct way to install the cam and timing set. Many cam makers have already advanced (in most cases) the cam timing when the cam was made, to suit the application. Unless the builder has access to an engine dynamometer or has advanced knowledge of the dynamics involved, advancing/retarding a cam is nothing but a shot in the dark as to whether it will result in any benefits at all. And there's the chance the engine output could be adversely affected by indiscriminately changing the phasing of the cam. | ||
| − | + | ==Resources== | |
| + | *[[Timing tabs and damper TDC lines SBC]] | ||
| + | *[[Determining top dead center]] | ||
| + | *[[How to make a timing tape]] | ||
[[Category:Engine]] | [[Category:Engine]] | ||
[[Category:Adjust valves]] | [[Category:Adjust valves]] | ||
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