New Yaris owner! A few questions...

[SirDigby]

Originally Posted by bronsin

maintenance valve clearance check at 60k.

what is this "maintenance valve clearance" stuff?
I was under the impression that this has a shim and bucket set up, so "maintenance" does not exist...

am I mistaken?

[bronsin]

Originally Posted by SirDigby

what is this "maintenance valve clearance" stuff?
I was under the impression that this has a shim and bucket set up, so "maintenance" does not exist...

am I mistaken?

Check your owners manual. Theres a requirement to check the clearances at 60,000 miles. At least there is on my 09. At some point they might eliminate the check because

In actual operation this check is almost never done and its rare to hear about a problem. But as the valves wear the clearance will become less and if it gets small enough the exhaust valves will burn. Sometimes the clearance gets bigger which isnt as bad but will make the engine noisier.

[SirDigby]

Originally Posted by bronsin

Check your owners manual. Theres a requirement to check the clearances at 60,000 miles. At least there is on my 09. At some point they might eliminate the check because

In actual operation this check is almost never done and its rare to hear about a problem. But as the valves wear the clearance will become less and if it gets small enough the exhaust valves will burn. Sometimes the clearance gets bigger which isnt as bad but will make the engine noisier.

I don't have an owners manual. if valves "wear" you would loose clearance at cam/bucket resulting in rattles and reduced performance. it could burn the valve, but only if it were to wear enough that the spring lost tension. I don't know how it can decrease clearance. I guess if the spring was pulling the valve into the head, but then you have other problems.

I just don't understand why an inspection when the repair is thousands of dollars... it's probably cheaper to just replace the engine....