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#79203 06/25/2007 7:53 PM | Joined: Jun 2007 Posts: 95 'Bolter | | 'Bolter Joined: Jun 2007 Posts: 95 | In response to Robert Oleis "Oly" Tech tip concerning valve adjustment under the "Tech Tip" Link....The article is fantastic and lays it out very clear and concise. My concern is due to my recent rebuilt engine, though. I intend to adjust the valves for engine start up today or tomorrow. We’re talking a 1954 235 Truck engine in my ’53 ½ ton. My lifters are mechanical – NOT hydraulic. My question to the Forum, is how can I let my “new” engine Idle for 30 minutes to warm up, when all the "break-in" period information out there would seem to indicate that the initial break in period is anything BUT a 30 minute idle....my understanding of the new engine break in, is that I shoould be up and down with the RMPs, accel, then decel, ....basically driving pretty inconsistent and hard... So when the engine starts, do I let it idle and adjust the valves when it warms up, or just drive it away like a bat out of hell? Any advice appreciated.
J.D. Jordan
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#79204 06/25/2007 8:16 PM | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | I would set the clearances slightly loose from the hot spec. It won't hurt the engine at all to run with them loose, and if you have a new cam it will loosen up a bit more as the cam and lifters break in. It will clatter a bit, but don't worry about it. Once you have run it for an hour or so, then you can adjust the valves hot, but the idea is to never adjust them tighter than spec or the seats will burn.
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#79205 06/25/2007 8:19 PM | Joined: Jul 2004 Posts: 5,708 'Bolter | | 'Bolter Joined: Jul 2004 Posts: 5,708 | dublenaught,
As you assemble the engine and get it ready to run, you can adjust the valves cold if you add .005 thousandths to the book HOT settings. This will get you very close and you can run your engine without fear of burning a valve.
If your cam requires a HOT setting of .006 on the intake, set it at .010 or .011 cold...same with the exhaust lash.
Have you followed the threads on cam break-in procedures and motor oil additives. Although this doesn't' seem to be critical for stock cam grinds and stock valve train components, it sure wouldn't hurt to give it a quick peek and maybe choose your initial oil fill based on what you find.
Stuart | | |
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