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OK , let's try this one more time . The question is how cool enough to adjust valves . The general consensus seems to be room temp , or about 70 degrees , although on a 90 degree day that might be tough Dusty
Or we could go to Jay's garage, he's got heat and air.
.... so adjusting them cold in my 40�F garage is not a good idea? (I just did this as I retorqued the head bolts)
I believe "cool" just means with the engine not up to normal running temp as in its cool enough to lay your hand on the cylinder heads. (Clearances specified by the designer) take into account a wide range of temperatures so as not to be critical.This subject could rival an oil thread. As Charlie Brown says "good grief".:-)
Can any scientographer among us offer any thermal expansion specs? I'll bet there's a slide rule involved, and that gets above my station in life. My gut tells me that there's a negligible difference at best for the normal ambient ranges such as 40 - 85 degrees f . . . and that the expansion characteristics of the head alloy and valve material would only be truly & measurably changed above 150deg and below freezing.I can't see there being an increasing detrimental effect for adjusting valves for every 10 degree delta +/- a 70 degree atmospheric baseline. I could be wrong - but I'd be interested to see what science offers to satisfy my curiosity.
Are you suggesting an oil thread ? We already have the annual ethanol thread going as well as a helmet thread All we need now is a counter steering thread ... Dusty
How about a tire thread?
A donut thread
Gonna have coffee w/that? How bout a smoke?You still off that stuff Dusty?
The coefficient of expansion on most common metals is determined and measured at 68 degrees F. Different alloys are rated at this temp and there arespecs given by the producers of the material for that expansion. Different standards organizations produce tolerances allowable for their criteria,ASTM,SAE, ANSI Etc.. Paul
When you first came on here posting often, you had just quit coffee.
Yep 40* is too cold
People say that, but is it true? How much variation is there in valve clearance between, say, 40 degrees F and 90 degrees F? Does anyone really know?
If the temperature was that critical between some of the lower temps and the higher temps during different times of year when it comes to adjusting the valves wouldn't there be engines over self destructing themselves because the clearances were either too tight or too loose? :Beating_A_Dead_Hors e_by_liviu