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Real general answer Posted by ari [Email]  (#2847) [Profile/Gallery]
(more from ari) on Sat, 21 Aug 2004 18:45:07
In Reply to: What would happen if valve adjustment is needed, but, cal, Sat, 21 Aug 2004 17:12:17 Members do not see ads below this line. - Help Keep This Site Online - Signup |
I've got to go general, because I'm not familar with Toyota pickup engines. I guess my first question is, do they actually have adjustable valves? I can believe a pickup truck engine will be a little older technology, but I'd figure most engines would have hydraulic, and therefore non-adjustable valves. If it's a pushrod engine, yes, they'd be adjustable. It would be nice to know if your particular engine has adjustable valves.
So, assuming adjustment is possible-
If the valves are mis-adjusted, at a minimum you'll have reduced performance and probably a hit on gas mileage.
Worst case? You could burn the valves - because they're open at the wrong time, exhaust gas comes through at the wrong time. You can push hot exhaust gas up into the intake manifold.
You can also overheat valves, and I've actually seen a car with a valve stem fail, and the valve head fell into the cylinder. Took quite a while to clean that mess up.
Really poor engine operation can cause overheating.
Carbon buildup can occur from more than just cheap gas. It can come from poor combustion process. The car with the failed valve stem had a significant carbon buildup which I believe was due to two things - first, the previous owner kept the revs low, even under load - 'lugging' the engine. Second, there was a problem in the ignition system causing poor combustion. You can do the same with an incorrect mixture.
I hoped this helped some.
posted by 12.76.155...
, Sat, 21 Aug 2004 18:45:07 <-- Viewing This Message
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