Posted by Jujitsu Lizard on November 8, 2008, 11:46 pm
Put in new ones this evening. First time I've ever seen a new spark plug or
handled one.
Observations:
a)They're smaller than I thought they would be. I'm guessing they are
smaller than automobile spark plugs.
b)The instructions in the shop manual said to go about a half turn beyond
finger tight. I went slightly less than half a turn because I could feel
the torque rising near the end. I finished them off with a torque wrench
set to the "used" plug value of 10 ft-lbs.
c)One poster cautioned against using a clicker torque wrench because one
could click the spark plug until it stripped out the cylinder threads. I
didn't find that to be the case. For 3 of the plugs, 10 ft-lbs. essentially
seated the plug so that torquing again produced no additional movement. For
1 of the plugs, I was a bit worried because subsequent reapplication of
torque caused more movement. But this settled down ... I think it was just
the crush washer being a bit weaker than the other 3.
But in any case, I didn't find any evidence that it would be possible to
"click-strip" the cylinder threads.
Of course, I was very careful and gentle to take it just to the click. I
suppose if you were a gorilla about it ... but I just didn't see an easy way
to strip things at the recommended torque.
The Lizard.
Posted by Rob Kleinschmidt on November 9, 2008, 1:31 am
> Put in new ones this evening. First time I've ever seen a new spark plug or
> handled one.
> Observations:
> a)They're smaller than I thought they would be. I'm guessing they are
> smaller than automobile spark plugs.
> b)The instructions in the shop manual said to go about a half turn beyond
> finger tight. I went slightly less than half a turn because I could feel
> the torque rising near the end. I finished them off with a torque wrench
> set to the "used" plug value of 10 ft-lbs.
> c)One poster cautioned against using a clicker torque wrench because one
> could click the spark plug until it stripped out the cylinder threads. I
> didn't find that to be the case. For 3 of the plugs, 10 ft-lbs. essentially
> seated the plug so that torquing again produced no additional movement. For
> 1 of the plugs, I was a bit worried because subsequent reapplication of
> torque caused more movement. But this settled down ... I think it was just
> the crush washer being a bit weaker than the other 3.
> But in any case, I didn't find any evidence that it would be possible to
> "click-strip" the cylinder threads.
> Of course, I was very careful and gentle to take it just to the click. I
> suppose if you were a gorilla about it ... but I just didn't see an easy way
> to strip things at the recommended torque.
Clicker wrenches can also go out of calibration.
Beam wrenches are pretty hard to screw up and
I personally prefer them because of this.
Posted by Outback Jon on November 9, 2008, 2:02 am
Jujitsu Lizard wrote:
> Put in new ones this evening. First time I've ever seen a new spark
> plug or handled one.
>
> Observations:
>
> a)They're smaller than I thought they would be. I'm guessing they are
> smaller than automobile spark plugs.
Judging from the pics about your valve adjust, they are exactly the same
size as most automobile spark plugs.
--
"Outback" Jon - KC2BNE
outback_jon@ver.no.sp.am.izon.net
AMD Opteron 165 (@2.5) and 6.1 GHz of other AMD power...
http://folding.stanford.edu - got folding? Team 53560
2006 ZG1000A Concours "Blueline" COG# 7385 CDA# 0157
Posted by . on November 9, 2008, 8:29 am
e:
> a)They're smaller than I thought they would be. �I'm guessing they are
> smaller than automobile spark plugs.
The motorcycles I owned in the 1970's did use car-sized spark plugs,
with 14-millimeter diameter threads.
However, as the motorcycle industry adopted the four valve per
cylinder head design, the space in the center of the combustion
chamber became increasing smaller so they went to 12mm and even 10mm
spark plug threads.
> c)One poster cautioned against using a clicker torque wrench because one
> could click the spark plug until it stripped out the cylinder threads. �
This could happen to a newbie who had little experience with a clicker
torque wrench and didn't believe that the correct torque had been
achieved with the first click. So the newbie applies torque over and
over, clicking the wrench multiple times and manages to get an extra
half turn on the spark plug.
What to do with those used spark plugs?
http://www.usnews.com/usnews/culture/articles/011224/archive_019915_2.htm
Small jagged ceramic fragments from broken spark plugs, can shatter
side window glass silently when thrown correctly. On the street
they're called ninja rocks. Unlike the slim jim, the ninja rock looks
like a bit of junk. Only with a string tied to it--as possessed by one
unwisely frugal thief in a Southeastern state not long ago--does it
become a prosecutable burglary tool.
Posted by Jujitsu Lizard on November 9, 2008, 8:50 am
> c)One poster cautioned against using a clicker torque wrench because one
> could click the spark plug until it stripped out the cylinder threads. �
>This could happen to a newbie who had little experience with a clicker
>torque wrench and didn't believe that the correct torque had been
>achieved with the first click. So the newbie applies torque over and
>over, clicking the wrench multiple times and manages to get an extra
>half turn on the spark plug.
My experience with clickers has been -- and since I'm a newbie I notice
those things -- that with an ordinary bolt it won't go any further after the
first or second click. The mechanism is probably that once the bolt stops
moving it is bound by static rather than kinetic friction.
One of the four spark plugs scared me a little, because it moved again on
the second click. After some thought I realized that it must be the crush
washer.
My impression is that with a spark plug you'd really have to use the wrench
improperly a large number of times, and that with any other bolt it would be
impossible to overtorque with a clicker used properly, no matter how many
times.
What I mean by "improperly" is that you don't yank the thing so that you
apply more torque after the click. Apply force gradually until it clicks.
>What to do with those used spark plugs?
>http://www.usnews.com/usnews/culture/articles/011224/archive_019915_2.htm
>Small jagged ceramic fragments from broken spark plugs, can shatter
>side window glass silently when thrown correctly. On the street
>they're called ninja rocks. Unlike the slim jim, the ninja rock looks
>like a bit of junk. Only with a string tied to it--as possessed by one
>unwisely frugal thief in a Southeastern state not long ago--does it
>become a prosecutable burglary tool.
It is unclear how to efficiently break a side window using a broken spark
plug. Why is a string relevant? What does thrown "correctly" mean?
I need more help here to understand how to commit crime with my leftover
spark plugs.
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> handled one.
> Observations:
> a)They're smaller than I thought they would be. I'm guessing they are
> smaller than automobile spark plugs.
> b)The instructions in the shop manual said to go about a half turn beyond
> finger tight. I went slightly less than half a turn because I could feel
> the torque rising near the end. I finished them off with a torque wrench
> set to the "used" plug value of 10 ft-lbs.
> c)One poster cautioned against using a clicker torque wrench because one
> could click the spark plug until it stripped out the cylinder threads. I
> didn't find that to be the case. For 3 of the plugs, 10 ft-lbs. essentially
> seated the plug so that torquing again produced no additional movement. For
> 1 of the plugs, I was a bit worried because subsequent reapplication of
> torque caused more movement. But this settled down ... I think it was just
> the crush washer being a bit weaker than the other 3.
> But in any case, I didn't find any evidence that it would be possible to
> "click-strip" the cylinder threads.
> Of course, I was very careful and gentle to take it just to the click. I
> suppose if you were a gorilla about it ... but I just didn't see an easy way
> to strip things at the recommended torque.