Valve adjustment SBC/BBC
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==Introduction== | ==Introduction== | ||
| − | Instructions for adjusting | + | Instructions for adjusting hydraulic lifters and setting the timing on a Chevy V8 engine for the initial start up after a rebuild. For details on setting the lash on solid lifters, refer to '''[[Adjusting solid lifters]]'''. |
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| + | {{Note1}}The procedures described herein will work on engines other than the Chevy V8. However, there may be differences in things like [http://www.crankshaftcoalition.com/wiki/Category:Firing_orders '''firing orders'''], cylinder numbering, distributor rotation, amount of lifter preload, method of setting lifter preload, etc. If in doubt, refer to the manufacturer's [http://www.crankshaftcoalition.com/wiki/Manuals_online '''service manual'''] for specific info. | ||
==Procedure== | ==Procedure== | ||
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If you can follow these instructions, the valves will be adjusted properly and the ignition timed and ready to start. Be sure if the engine is newly assembled or has sat for an extended period of time that the oil system is first primed before starting the engine. | If you can follow these instructions, the valves will be adjusted properly and the ignition timed and ready to start. Be sure if the engine is newly assembled or has sat for an extended period of time that the oil system is first primed before starting the engine. | ||
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| + | ==Alternative view/terminology== | ||
| + | As with any single "center camshaft" engine that is fitted with hydraulic cam followers or "lifters", we are not actually adjusting valves. The term "adjusting valves" is a carry-over from the old days when mechanical valve operation was common. For these, there was an actual valve tip-to-follower clearance adjustment that was required. | ||
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| + | With hydraulic (originally called "self adjusting") lifters in an OHV engine, we are adjusting the lifter preload to position the lifter plunger within the lifter body. The goal is to set the plunger at the prescribed position within the lifter body. | ||
| + | Many hydraulic lifter plungers will have a hydraulic functioning range of around 0.100" or so- but this is not the the case in all lifters, so this must be verified for the particular lifter being used. | ||
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| + | [http://www.youtube.com/watch?v=lorANZ1Tptw '''Here'''] is a video that shows an animation of a hydraulic lifter in operation. | ||
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| + | The lifter preload adjustment can be done statically (engine off) or dynamically (engine running). When this adjustment is done statically, some recommend that the crankshaft be stopped in as many "stops" as there are cylinders. In other words for a V8 engine, use 8 stops beginning with #1 cylinder @ TDC of the compression stroke, continuing following the engine's firing order) and not the 2 or 3 stop procedure that is sometimes recommended. | ||
==Also see== | ==Also see== | ||
| + | *[[Adjusting hydraulic lifters]] | ||
*[http://www.crankshaftcoalition.com/wiki/Category:Adjust_valves Adjust valves] | *[http://www.crankshaftcoalition.com/wiki/Category:Adjust_valves Adjust valves] | ||
*[[How to make a timing tape]] | *[[How to make a timing tape]] | ||
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[[Category:Adjust valves]] | [[Category:Adjust valves]] | ||
[[Category:GM]] | [[Category:GM]] | ||
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