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Author Topic: Valve adjustment interval  (Read 461 times)
LongRanger
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« on: November 10, 2013, 08:27:17 PM »
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Curious why the valve adjustment interval on a low rev engine like a SB is so frequent (7500km). Is it due to the screw and locknut setup (vs. shims and buckets)? I recognize it's not OHC, if that makes any difference.
« Last Edit: November 10, 2013, 08:29:12 PM by LongRanger » Logged
Kev m
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« Reply #1 on: November 10, 2013, 08:30:20 PM »
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Curious why the valve adjustment interval on a low rev engine like a SB is so frequent (7500km). Is it due to the screw and locknut setup (vs. shims and buckets)?

It's 10k km now (1Tb models)...

like the BBs I believe.


I suspect in both cases it was because it's cheap, easy, and there's no good reason not to make it correspond with other intervals.

For the same reasons, once it settles, betcha 10k miles would be fine too.
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« Reply #2 on: November 10, 2013, 11:23:36 PM »
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Thanks. On "sportier" engines, the interval can be much less frequent (up to 26k miles on some Yamaha's), which I assumed was due to their camshaft/valvetrain configuration. Wasn't sure if the SB's interval was more frequent simply due to their pushrods and screw/locknut.


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jabberwocky
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« Reply #3 on: November 11, 2013, 07:55:00 AM »
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Usually the need for valve adjustment comes from valve seats getting hammered out, not wear in the rocker gear, in my experience. Seriously, I bet for every time I've tightened up an adjuster, I've loosened them up ten times. A loose valve is just noisy, a tight valve can cost you big time.
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« Reply #4 on: November 11, 2013, 09:28:21 AM »
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Usually the need for valve adjustment comes from valve seats getting hammered out, not wear in the rocker gear, in my experience. Seriously, I bet for every time I've tightened up an adjuster, I've loosened them up ten times. A loose valve is just noisy, a tight valve can cost you big time.

Well... a too-loose valve setup can shorten the breathing time [some] and thus lower horsepower [some].

Like you I prefer to set them up a bit on the loose side of "perfect" just to be safe.
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