Valve adjustment SBC/BBC
From Crankshaft Coalition Wiki
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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====== | ||
| + | <font size="1">NOTE: As with any single "center camshaft" engine (that is fitted with Hydraulic Cam Followers [aka 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 stem-to-follower clearance adjustment that was required. | ||
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| + | With Hydraulic Cam Followers (originally coined "self adjusting"), we are adjusting the rocker arm stud nut height as to change the push rod geometry as to positon the cam follower plunger "depth" within the cam follower body. | ||
| + | Many hydraulic plungers will have a hydraulic functioning range of around .100" or so. | ||
| + | The goal is to set the plunger at it's OEM prescribed depth within the follower body. | ||
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| + | Here is an image that shows a cam follower as it becomes hydraulically active. Note the plunger and it's travel within the follower body. | ||
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| + | http://www.youtube.com/watch?v=lorANZ1Tptw | ||
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| + | This adjustment can be done statically or dynamically. | ||
| + | When this initial adjustment is done statically, I highly recommend that we stop the crankshaft in as many "stops" as there are cylinders. IOW, for a V-8 engine, we use the 8 stop procedure, beginning with #1 cylinder @ TDC C/S (right down the engine's firing order)..... not the 2 or 3 stop procedure that is sometimes recommended. | ||
| + | </font> | ||
==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]] | ||
*[[Camshaft install tips and tricks]] | *[[Camshaft install tips and tricks]] | ||
| + | *[[http://www.aera.org/ep/downloads/ep10/EP04-2010_20-30.pdf]] | ||
[[Category:Engine]] | [[Category:Engine]] | ||
[[Category:Adjust valves]] | [[Category:Adjust valves]] | ||
[[Category:GM]] | [[Category:GM]] | ||
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