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Valve clearance

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Old 08-29-14, 04:01 PM   #1
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Default Valve clearance

I can find no reference to checking valve adjustment at any mileage. I can't believe that correct clearance lasts forever.
BMW, for one, requires clearance check at the 60K mile service.
Any comments on this?
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Old 08-29-14, 06:29 PM   #2
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I found the requirement in the "2004 Owner's Manual Supplement: Warranty and Scheduled Maintenance"

In the table of engine maintenance it is listed as Valve Clearance with an "I" for inspect and correct and replace as necessary at 60K miles.

Under "Explanation of scheduled maintenance items" it says:

Valve Clearance
Inspect the tappet noise and engine vibration and adjust if necessary. A qualified technician should perform this operation.

So apparently Lexus Techs are so good they can tell if a valve needs adjustment by sound and feel.

The Haynes manual has checking valve clearance in the tune-up and routine maintenance chapter. It shows the usual method of pulling the valve covers and checking the clearance with a feeler gauge.

I have not heard of anyone actually checking the clearance. The front cylinders would be relatively easy. The back a PITA since you need to remove the upper intake manifold to get the valve cover off.
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Old 08-30-14, 04:47 PM   #3
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Thanks, Joe
I saw the bit about "inspecting" valve clearance. I suppose if the valves are clicking, the lash has opened up a bit, which probably won't hurt anything. It will affect valve timing a slight bit. I suspect lash increases ( if any) rather than decreases on these motors.
Since valve lash adjustment doesn't seem to be an issue, I'll cruise on and not worry about it.I've got 83KMiles and a very quiet motor.
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Old 08-30-14, 08:05 PM   #4
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Yup, had 189k miles on last RX300, and 148k on RX400h and both engines are quiet. Let it go, the new engines are very much better than old yesterday engines.
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Old 09-01-14, 11:02 AM   #5
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The ohc motors, like we have, ALWAYS get tighter when the valves move. The clearance goes to zero. Noise is good...no noise is bad. Learned this the hard way on a Honda crf 450 dirt bike.

I said ALWAYS. There may be a case where it wore away and increased, but that wont hurt anything until it gets seriously bad. Its like chains..loose is a thousand times better than too tight.
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Old 09-02-14, 09:29 AM   #6
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Quote:
Originally Posted by rcannon409 View Post
The ohc motors, like we have, ALWAYS get tighter when the valves move. The clearance goes to zero. Noise is good...no noise is bad. Learned this the hard way on a Honda crf 450 dirt bike.

I said ALWAYS. There may be a case where it wore away and increased, but that wont hurt anything until it gets seriously bad. Its like chains..loose is a thousand times better than too tight.
I thought that any lash was adjusted for hydraulically, as in most modern motors. The oil pressure keeps the clearances tight.
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Old 09-02-14, 09:29 AM
 
 
 
 
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