bflint
Been there
Thread starter
Guess tightening may be the most frequent case. All I have is the valve clearance history, done by the dealers, to go by, which shows some Intakes loosening.Django_imp said:
Valve Shimming - which side of spec?
- Thread starter bflint
- Start date
zirconxi_imp
Running like a top
My intake valve is getting loose over time. Not much change for exhaust side. Could be cause by my frequent short ride or overly oiled K&N air filter causing carbon built up.Django_imp said:
Personally I would try to aim at the middle of the spec, which ever side which is nearer. Shimming to any side of the spec is acceptable as long as its within the spec.
LakeWylieJoe_imp
Running like a top
My valves have been loose more often than tight.
GoldOxide_imp
Road warrior
My intake valve is getting loose over time. Not much change for exhaust side. Could be cause by my frequent short ride or overly oiled K&N air filter causing carbon built up.zirconxi_imp said:
Personally I would try to aim at the middle of the spec, which ever side which is nearer. Shimming to any side of the spec is acceptable as long as its within the spec.
Yeah. If one is going through the time and exercise of getting into the valve area anyway to check the gaps, and if one or more is out - why not just go for as close as possible to mid-point of the spec?
the Ferret
Road warrior
My thought is if it's in spec, why not leave it alone so you dont have to pull the cams
zirconxi_imp
Running like a top
Agreed. I am also the believer of if it ain't broken, leave it alone. If in spec, should just leave it alone till it is out of spec. But if it is out, i would aim for the middle.. We will never know if the gap will tighten or loosen over time. Too many variables.The ferret_imp said:
Houtman_imp
Road warrior
I think that "Time Is On My Side " when it comes to the valves .....
bflint
Been there
Thread starter
I would concur with you Mr Ferret. I have several that were out of spec so time to do the adjustmentThe ferret_imp said:
the Ferret
Road warrior
Ahhh unavoidable then
max
Road warrior
Mr flint and others have a look at this guy's clip, my advice; spend the time to block any openings with pieces of cloth stuck into them before removing any buckets.
Nothing to be scared off but learning from someone else's mistakes is the best way
As for which way the clearance shifts, it seems that over time the manufacturers have balanced valve seating and camlobe wear so they balance each other out by selecting hardness etc. just a wild guess...all we do is a fine adjustment check.
There are engines without shims but different size buckets and they are good for the life of the engine according to the manufacturer.
Here is a quote from the toyota yaris forum;
" I have had motorcycles for 15 years that use the same adjustment set up as on the ECHO and Yaris. Once set properly they tend to last a long time. My 92 ST1100 had 109k on it and was never adjusted. On the other hand, a 2001 BMW I bought new had ZERO clearance on both exhaust valves from the factory. Lucky for me I checked it at 600 miles.
Almost no cars use this system. Frankly I would not trust a Toyota mechanic to do an adjustment. The good news is a CHECK is easy, well within a home mechanics capacity. More good news....very few ECHOs or Yaris's have ever had their valves checked much less adjusted. The origional setting last perhaps the life of the car.
Bad news.
An adjustment is difficult and rarely done by mechanices at Toyota. Also, as the valves wear they receed into the head causing the clearance of the exhust valves to lessn over time. You wind up with tight exhaust valves which burn and cause a valve job.
Good news. You seldom if ever hear of this problem (valve job) I never have.
Recommendation.
Check your adjustment yourself at 60,000 miles. I wtote a proceedure at Edumunds at the ECHO forum. Theres like 6000 posts in it now."
__________________
Nothing to be scared off but learning from someone else's mistakes is the best way
As for which way the clearance shifts, it seems that over time the manufacturers have balanced valve seating and camlobe wear so they balance each other out by selecting hardness etc. just a wild guess...all we do is a fine adjustment check.
There are engines without shims but different size buckets and they are good for the life of the engine according to the manufacturer.
Here is a quote from the toyota yaris forum;
" I have had motorcycles for 15 years that use the same adjustment set up as on the ECHO and Yaris. Once set properly they tend to last a long time. My 92 ST1100 had 109k on it and was never adjusted. On the other hand, a 2001 BMW I bought new had ZERO clearance on both exhaust valves from the factory. Lucky for me I checked it at 600 miles.
Almost no cars use this system. Frankly I would not trust a Toyota mechanic to do an adjustment. The good news is a CHECK is easy, well within a home mechanics capacity. More good news....very few ECHOs or Yaris's have ever had their valves checked much less adjusted. The origional setting last perhaps the life of the car.
Bad news.
An adjustment is difficult and rarely done by mechanices at Toyota. Also, as the valves wear they receed into the head causing the clearance of the exhust valves to lessn over time. You wind up with tight exhaust valves which burn and cause a valve job.
Good news. You seldom if ever hear of this problem (valve job) I never have.
Recommendation.
Check your adjustment yourself at 60,000 miles. I wtote a proceedure at Edumunds at the ECHO forum. Theres like 6000 posts in it now."
__________________
bflint
Been there
Thread starter
Thanks Mr Max. I have worried a bit about that. Will check what prevention steps I can implement prior to replacing the shims. Good news is that I have a "stubby air nozzle" that I can do compressed air voodoo magic withmax_imp said:Mr flint and others have a look at this guy's clip, my advice; spend the time to block any openings with pieces of cloth stuck into them before removing any buckets.
Nothing to be scared off but learning from someone else's mistakes is the best way
As for which way the clearance shifts, it seems that over time the manufacturers have balanced valve seating and camlobe wear so they balance each other out by selecting hardness etc. just a wild guess...all we do is a fine adjustment check.
There are engines without shims but different size buckets and they are good for the life of the engine according to the manufacturer.
Here is a quote from the toyota yaris forum;
" I have had motorcycles for 15 years that use the same adjustment set up as on the ECHO and Yaris. Once set properly they tend to last a long time. My 92 ST1100 had 109k on it and was never adjusted. On the other hand, a 2001 BMW I bought new had ZERO clearance on both exhaust valves from the factory. Lucky for me I checked it at 600 miles.
Almost no cars use this system. Frankly I would not trust a Toyota mechanic to do an adjustment. The good news is a CHECK is easy, well within a home mechanics capacity. More good news....very few ECHOs or Yaris's have ever had their valves checked much less adjusted. The origional setting last perhaps the life of the car.
Bad news.
An adjustment is difficult and rarely done by mechanices at Toyota. Also, as the valves wear they receed into the head causing the clearance of the exhust valves to lessn over time. You wind up with tight exhaust valves which burn and cause a valve job.
Good news. You seldom if ever hear of this problem (valve job) I never have.
Recommendation.
Check your adjustment yourself at 60,000 miles. I wtote a proceedure at Edumunds at the ECHO forum. Theres like 6000 posts in it now."
__________________
peterbaron
Road warrior
OMG :huh:
Dave, to be clear, I know nothing about this subject, but ... I think the values .065 and .051 are shim sizes rather than clearances. Would that make sense?
jimgl3_imp
Been there
I'm with Django. Nicely put Django.
bflint
Been there
Thread starter
Yes they are supposed to represent valve clearances. Typo error on my part. Sorry for confusion! I have been working wee into the morning hours on IT problems at work. What I meant is 0.0065 and 0.0051. FYI, got this figures from the spreadsheets I posted.Dave_imp said:
Yes they are supposed to represent valve clearances. Typo error on my part. Sorry for confusion! I have been working wee into the morning hours on IT problems at work. What I meant is 0.0065 and 0.0051. FYI, got this figures from the spreadsheets I posted.
[/QUOTE]
Thank you very much for that clarification Bflint! I don't mean to be anal, but it comes with being an aerospace engineer. I have made errors much smaller than this in reports I have published and you would have thought the entire world stopped turning.
[/QUOTE]
Thank you very much for that clarification Bflint! I don't mean to be anal, but it comes with being an aerospace engineer. I have made errors much smaller than this in reports I have published and you would have thought the entire world stopped turning.
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