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Old 08-05-2009, 05:06 PM   #1
bikeshox
 
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Valve Adjustments

Has anyone ever inspected their valve clearance? If so, did you need to make adjustments? Im right around the 60,000 mile mark so I should probably do this soon.
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Old 08-05-2009, 05:54 PM   #2
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Originally Posted by bikeshox View Post
Has anyone ever inspected their valve clearance? If so, did you need to make adjustments? Im right around the 60,000 mile mark so I should probably do this soon.
It calls for around 6 hrs flat-rate for the labor, if we're talking Yaris.
Are you getting valvetrain noise?
You don't adjust them, you put spacers in where they're out of spec, after you remove the cams. Ouch.
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Old 08-05-2009, 06:29 PM   #3
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I thought our valves were self-adjusting -- no?
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Old 08-05-2009, 07:00 PM   #4
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No, not self-adjusting. According to the FSM the lifters are to be replaced when valve clearances must be adjusted:

Quote:
Lifters are available in 35 sizes in increments of
0.020mm (0.0008 in.), from 5.060 mm (0.1992 in.)
to 5.740 mm (0.2260 in.).
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Old 08-06-2009, 12:02 AM   #5
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^^^ouch, per lifter pricing is expensive too right?
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Old 08-06-2009, 04:42 AM   #6
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Just sold an 01 Echo with 220,000kms, never knew i was supposed to check the valves I'd say unless your valves are making a lot of noise just leave em alone.
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Old 08-06-2009, 07:47 AM   #7
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Old 08-06-2009, 05:00 PM   #8
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Originally Posted by PK198105 View Post
valve clerance check is part of the maintenance schedule. i just got mine checked about a week ago. Total price 282$CAD.
"Inspect" is part of the 60,000 maintenance, says to listen for excessive tappet noise and look for engine vibration. Clearance can be measured with a gauge, but cams have to be removed if any are found out of spec. Just multiply about 6 hrs X local labor rate, then start adding the price of lifter(s)... gets real expensive in a hurry.
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Old 08-06-2009, 06:31 PM   #9
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my service book on my 2009 calls for it @120K miles. At that point the car will probably be worth so little I'd be inclined to just drive until it dies.
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Old 08-08-2009, 05:55 AM   #10
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my service book on my 2009 calls for it @120K miles. At that point the car will probably be worth so little I'd be inclined to just drive until it dies.
If you read PK's link on what that checkup entails you'll see that its an audio inspection meaning if your valves arent making any abnormal noise then they're ok.
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Old 08-08-2009, 11:02 AM   #11
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Originally Posted by jambo101 View Post
If you read PK's link on what that checkup entails you'll see that its an audio inspection meaning if your valves arent making any abnormal noise then they're ok.
A valve clearance inspection is not a "audio inspection"!!! It's a physical inspection using a feeler gage to measure clearances. What if your valve clearance is too small? They wouldn't be making any noise then, yet undersize clearances can burn out your valves!

Don't depend on noise to determine if the valves are OK. It can't be done.
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Old 08-08-2009, 11:49 AM   #12
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Heres the link to the maintainance schedule check out the 7th item in the 64k inspection http://xws.xtime.com/xmmmenu/?varian...estimate=false
I agree not much of a valve inspection.
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Old 08-08-2009, 01:51 PM   #13
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And Mitchell repair says to LISTEN for noise, then check for engine smoothness, before going to the actual trouble of pulling cyl head cover and checking clearance with a gauge.
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Old 08-08-2009, 01:54 AM   #14
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I don't know if I've had my valve clearance ever checked .... how can I tell if something is up? I'm already at 131,000km lol.
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Old 08-09-2009, 02:02 AM   #15
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Yeah, I read that link, but I still don't agree with it. Noise will only occur with increasing clearances, such as when the cam or spacers wear. But wear on the valve itself or the valve seat, will DECREASE clearances, resulting in less noise. By the time the engine starts running rough (due to lowered compression from the valve not closing), the damage has already been done, i.e. a burned valve.

I've seen burned valves, and they can literally look like someone took a cutting torch to them. This happens because if the valve isn't properly seated, it can't cool off, and will become as hot as the exhaust gasses which are above the melting point of metal.

The moral of the story is to check the clearances with a feeler, and don't wait for them to become noisy to do so.

Something odd I noticed about that site is that it calls for the valve clearance check at 64,000 km (roughly 40,000 miles). My 2008 Yaris "Scheduled Maintenance Guide" doesn't call for a valve clearance check until 60,000 miles....
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Old 08-09-2009, 02:19 AM   #16
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whose the one with like 350,000 miles on his car? ask if he's had that check done... I don't think that's been an issue with higher mileage cars. I've got a new one again with 20k on it so I've just changed oil haven't even considered that stuff at all.
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Old 08-09-2009, 08:03 AM   #17
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Run it til it drops and DIY plug and play a salvage engine for less than the cost of a skilled factory valve adjustment?
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Old 08-09-2009, 02:44 PM   #18
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With todays overhead cam engines what exactly do you adjust?,if the cam is opening the valve wouldnt the cam ultimately wear down causing the valve to not open as much as when it was new, and wouldnt a whole new cam shaft be needed to remedy the situation.,
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