Do valves get tighter with mileage??

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Old 23 Feb 2004, 10:23 am   #1 (permalink)
Jim
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Default Do valves get tighter with mileage??

94 Camry V6. I'm wondering if the valve clearances get tighter or looser with mileage. I'm
getting ready to replace the valve cover gaskets and check clearances at 115k miles. Do the
spark plug tube seals need to be replaced too? Do they come with the gasket package? Anything
else I should do while I'm wading around in all that sludge :-) ? I also intend to replace the
plugs and thermostat while they're easy to get to.

TIA Jim
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Old 23 Feb 2004, 12:32 pm   #2 (permalink)
Philip®
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Default Re: Do valves get tighter with mileage??

In news:8s7k30p00vp53oj5ic6n7fql1c5hvvveg5@4ax.com,
Jim <jmcfNOT@NOTmindspring.com> being of bellicose mind posted:
> 94 Camry V6. I'm wondering if the valve clearances get tighter or
> looser with mileage. I'm getting ready to replace the valve cover
> gaskets and check clearances at 115k miles. Do the spark plug
> tube seals need to be replaced too? Do they come with the gasket
> package? Anything else I should do while I'm wading around in all
> that sludge :-) ? I also intend to replace the plugs and
> thermostat while they're easy to get to.
>
> TIA Jim


Think about it.

IF there is valve face and/or valve seat "erosion" ... then the valve
lash will decrease. On the other hand, If no meaningful valve face
or seat erosion occures ... BUT ... some cam bearing wear occurs,
then the valve lash will increase (the cam has moved away from the
valves). Then you have the remote possibility of cam lobe and/or
valve shim wear which would increase valve lash.

Toyota's shimmed valve trains are very stabil. A case in point was
my 1990 Prizm (4AFE engine). ALL the valves stayed with in tolerance
for the 285k miles I owned the car. Remember too .... where I
mentioned earlier about cam bearing and cam lobe wear .... a history
of clean oil will improve the life span of both.


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