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Old 12-19-2008, 10:05 AM   #1
MOKE1K
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Cool Tight Or Loose?

After several years of working at different shops and dealers I'v always made it a point to ask the best tech's in each shop how they set valve clearences. Manufactures usually give you a range from say 0.08mm-0.18mm. Do you set them on the tight side or on the loose side?

You would be amazed at the many different answers I have recieved. I believe the best way is on the loose end of the scale. What are your opinions or experience on valve adjustments, how do you set them and why.
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Old 12-19-2008, 10:22 AM   #2
longride
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I always set them loose for two reasons: One, is that valve clearance on modern motors usually tighten. Two, is that too loose will hurt nothing, but too tight will result in engine damage, probably a burnt valve. You should be able to hear them, quiet is bad. Slappy valves are happy valves.
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Old 12-19-2008, 10:25 AM   #3
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I'd go loose.
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Old 12-19-2008, 10:58 AM   #4
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Quote:
Originally Posted by longride View Post
I always set them loose for two reasons: One, is that valve clearance on modern motors usually tighten. Two, is that too loose will hurt nothing, but too tight will result in engine damage, probably a burnt valve. You should be able to hear them, quiet is bad. Slappy valves are happy valves.
Wow, Iam impressed! I dont know if its something in the water, but here in florida it seems the most logical way to know if you need an adjustment is by sound?

Everyone here seems to follow this theory, dont ask me why.

Vales wear tight, not loose!
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Old 12-19-2008, 11:03 AM   #5
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They do wear tight. When you can't hear them ticking a bit, time to check them.
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Old 12-19-2008, 11:29 AM   #6
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Ditto, Loose is best... "slappy valves are happy valves"..LOL, Excellent..
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Old 12-19-2008, 01:21 PM   #7
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Loose valves can be a problem in solid lifter pushrod engines. If too loose the rod can slip out of the rocker and very chaotic is the result. On an OHC engine this is not a problem. Too tight will burn valves as has been stated.

I know these things from personal experience.
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Old 12-19-2008, 01:25 PM   #8
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Nevermind. I thought you were talking about something ELSE..........
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Last edited by The_AirHawk : 12-19-2008 at 05:35 PM. Reason: Oh! You meant "Valves"!
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Old 12-19-2008, 02:11 PM   #9
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Quote:
Originally Posted by seruzawa View Post
Loose valves can be a problem in solid lifter pushrod engines. If too loose the rod can slip out of the rocker and very chaotic is the result. On an OHC engine this is not a problem. Too tight will burn valves as has been stated.

I know these things from personal experience.
A common practice with flatrate technicians when performing a valve adjustment on a overhead cam motor with shims, is to jam their smallest feeler gauge in and if they can make it fit they dont adjust them at all. However they'll charge you for the entire job.
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Old 12-19-2008, 04:35 PM   #10
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Quote:
Originally Posted by MOKE1K View Post
A common practice with flatrate technicians when performing a valve adjustment on a overhead cam motor with shims, is to jam their smallest feeler gauge in and if they can make it fit they dont adjust them at all. However they'll charge you for the entire job.
That's not the least surprising. I've seen botch jobs done by shops over the years that are astounding. Torrance Honda in 1971 for example. They'd do stuff like take a clapped out 305Scrambler and thicken the oil with STP until it quit smoking and then sell it for a premium price.

That's why I do all my maintenance and my own rebuilds and I recommend everyone else do too.
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