Posted by Sean_Q_ on September 20, 2009, 11:14 pm
Late news flash: the metallic hammering sound went away when I adjusted
the valves on the left cyl, which were looser than spec. But not much
looser. It's amazing how a small difference could make such a loud
noise.
However, the loose jangly sound is still there. And now it's only
slightly affected by the light switch. This bike seems to change
it's mood day by day. Maybe I'll give it a Ukrainian girl's name.
The manual says set the valve clearance to .07 mm ... I don't have any
metric feeler gauges but I've got a 0.003" so I used that. Actually,
there's not much adjustment screw range between .07 mm and none at all;
I think that soon I'll get to know how to set the clearance just by feel
and dispense with the gauge.
SQ - "Come to kindly terms with your ass, for it bears you." --John Muir
'06 Zook S40 / '85 Denpr MT-11 / various cases in triage
Posted by Beauregard T. Shagnasty on September 21, 2009, 6:33 am
Sean_Q_ wrote:
> Late news flash: the metallic hammering sound went away when I
> adjusted the valves on the left cyl, which were looser than spec. But
> not much looser. It's amazing how a small difference could make such
> a loud noise.
Super. That's what I said several days ago, in one of your other Dnepr
threads. I mentioned the "regular 300 mile valve lash adjustments."
> However, the loose jangly sound is still there. And now it's only
> slightly affected by the light switch. This bike seems to change it's
> mood day by day. Maybe I'll give it a Ukrainian girl's name.
It's a Dnepr. It will clash and thrash forever. Get used to it.
> The manual says set the valve clearance to .07 mm ... I don't have
> any metric feeler gauges but I've got a 0.003" so I used that.
> Actually, there's not much adjustment screw range between .07 mm and
> none at all; I think that soon I'll get to know how to set the
> clearance just by feel and dispense with the gauge.
If'n I were you, I would not trust "by feel" while adjusting your
valves. I've been adjusting airhead Beemer valves for decades, and I
always use the gauges.
Go get a set of metric feelers if you wish. Maybe $8CDN? Or, as you
say, the 0.003 inch is close enough to 0.07mm.
--
-bts
-Friends don't let friends drive Windows
Posted by Mark Olson on September 21, 2009, 8:28 am
Beauregard T. Shagnasty wrote:
> It's a Dnepr. It will clash and thrash forever. Get used to it.
FSVO "forever"
> If'n I were you, I would not trust "by feel" while adjusting your
> valves. I've been adjusting airhead Beemer valves for decades, and I
> always use the gauges.
It would be a *very* rare individual who could properly set valve lash
by feel. I think SQ might be thinking it's like setting the lash of
an engine with hydraulic lifters.
> Go get a set of metric feelers if you wish. Maybe $8CDN? Or, as you
> say, the 0.003 inch is close enough to 0.07mm.
Don't bother. There's always an acceptable range of adjustment and unless
he's missing a leaf there's zero need to buy a metric set just because
the spec is expressed in mm.
Posted by Datesfat Chicks on September 21, 2009, 9:21 am
> Beauregard T. Shagnasty wrote:
>> It's a Dnepr. It will clash and thrash forever. Get used to it.
> FSVO "forever"
>> If'n I were you, I would not trust "by feel" while adjusting your
>> valves. I've been adjusting airhead Beemer valves for decades, and I
>> always use the gauges.
> It would be a *very* rare individual who could properly set valve lash
> by feel. I think SQ might be thinking it's like setting the lash of
> an engine with hydraulic lifters.
>> Go get a set of metric feelers if you wish. Maybe $8CDN? Or, as you
>> say, the 0.003 inch is close enough to 0.07mm.
> Don't bother. There's always an acceptable range of adjustment and unless
> he's missing a leaf there's zero need to buy a metric set just because
> the spec is expressed in mm.
0.003 is about 9% too big.
10% is beginning to get significant (one part in ten).
If it were one part in fifty or one part in twenty ... OK. But one part in
ten means that he really is adjusting the valves differently than
recommended.
Datesfat
Posted by Mark Olson on September 21, 2009, 9:44 am
Datesfat Chicks wrote:
>> Don't bother. There's always an acceptable range of adjustment and
>> unless
>> he's missing a leaf there's zero need to buy a metric set just because
>> the spec is expressed in mm.
>
> 0.003 is about 9% too big.
>
> 10% is beginning to get significant (one part in ten).
>
> If it were one part in fifty or one part in twenty ... OK. But one part
> in ten means that he really is adjusting the valves differently than
> recommended.
No, you are wrong. There is never, in my experience, an exact valve
lash that is specified. It is _always_ a range of values. Any value
within that range is perfectly fine.
This is a Dnepr we're talking about, and worrying about 2/10,000 of
an inch error in the valve lash adjustment for this fine piece of
machinery is beyond laughable. It's going to change by that much in
the first ten miles after the adjustment, FFS.
You just don't know enough about machinery to be offering this kind of
advice. Not hating, just being honest.
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> adjusted the valves on the left cyl, which were looser than spec. But
> not much looser. It's amazing how a small difference could make such
> a loud noise.