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Old 05-05-2012, 11:08 AM   #1
Poway OP
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Did I mortally wound my motor? Previous tune up valve clearances set to tight.

Hi ADV,
Despite having JVB's DVD, 2 manuals and tons of internet info, I blew it. On previous tune up (6000 miles ago) I set my valve clearances to tight, and probably not on TDC. Mistake caught on my current tune up. At TDC (verified) I can not get minimum clearances on my both intake and exhaust, left side valves. At full extraction all 4 valve springs, have almost no clearance. Approx 1/5 the recommended. The right side of the motor is OK. Bike was running great.
Spoke to dealer about it, he said mistake is unreversable. And that things will get worse. then bad. Much better to err on the loose side than tight on valve clearance settings.
1999 GS1100
How bad did I screw up? Did I cause the beginning of the end?
Thanks in advance

Poway screwed with this post 05-05-2012 at 11:42 AM
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Old 05-05-2012, 11:35 AM   #2
mousitsas
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not sure, but I think that...

tappet valves get looser with time, shim valves get tighter. Yours are tappets.
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Old 05-05-2012, 11:35 AM   #3
Jim Moore
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Quote:
Originally Posted by Poway View Post
Hi ADV,
At TDC (verified) I can not get minimum clearances on my both intake and exhaust, left side valves. At full extraction all 4 valve springs, have almost no clearance. Approx 1/5 the recommended. The right side of the motor is OK.
You know you have to turn the motor 360 degress before you check the other side, right?
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Old 05-05-2012, 11:45 AM   #4
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ya... make sure the procedure is done correctly.

if it was done improperly... are there any issues with how the bike runs?

if you are doing the procedure correctly now and there is clearance problems I would do a leak down check to see if the valves are burnt. this would only be the exhaust side. If it's cooked then time for valve work.
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Old 05-05-2012, 12:06 PM   #5
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As long as you had some clearance, don't worry about it. The danger is if the adjustment is so tight that the valve stays open some amount and the high temperature combustion products erode an erosion in the valve head. Too tight valves will cause starting difficulty if they're tight enough to do damage.
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Old 05-05-2012, 12:19 PM   #6
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Thank You All !!!

Jim I did not rotate the engine 360. After your post, I rotated and all is well!!!
Thank you
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Old 05-05-2012, 12:46 PM   #7
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Quote:
Originally Posted by mousitsas View Post
tappet valves get looser with time, shim valves get tighter. Yours are tappets.
Sir,
That is contrary to everything I have heard and experienced.

As far as I know, the valves are harder than the cylinder head.
And they work themselves upwards, slowly but surely.
The gap above them gets smaller.

This corresponds to my 190.000 km of experience with the R-engines.
The gap gets smaller, and must be adjusted.

Can someone correct me if I am wrong, please!

[TaSK]
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Old 05-05-2012, 12:47 PM   #8
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Quote:
Originally Posted by Anorak View Post
As long as you had some clearance, don't worry about it. The danger is if the adjustment is so tight that the valve stays open some amount and the high temperature combustion products erode an erosion in the valve head. Too tight valves will cause starting difficulty if they're tight enough to do damage.
Sir,
I will take the liberty of adding this to the GSpot FAQ.
If you don't mind!

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Old 05-05-2012, 12:53 PM   #9
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Quote:
Originally Posted by Poway View Post
Spoke to dealer about it, he said mistake is unreversable. And that things will get worse. then bad.
You think the dealer was just trying to sell you an unneeded replacement engine?
I bet they would have sold your old engine on to the next guy that needed one.
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Old 05-05-2012, 12:53 PM   #10
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Quote:
Originally Posted by tagesk View Post
Sir,
That is contrary to everything I have heard and experienced.

As far as I know, the valves are harder than the cylinder head.
And they work themselves upwards, slowly but surely.
The gap above them gets smaller.

This corresponds to my 190.000 km of experience with the R-engines.
The gap gets smaller, and must be adjusted.

Can someone correct me if I am wrong, please!

[TaSK]
You are correct. And I for one always make sure mine are looser than tighter when setting them.
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Old 05-05-2012, 01:31 PM   #11
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Always err on the loose side!
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Old 05-05-2012, 02:34 PM   #12
Jim Moore
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Quote:
Originally Posted by Poway View Post
Jim I did not rotate the engine 360. After your post, I rotated and all is well!!!
Thank you
Atta boy! Next time, when you get to tdc wiggle the rocker arms on both sides. One side will be loose. That's the side to start on.
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Old 05-05-2012, 04:50 PM   #13
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Great catch Jim!
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Old 05-05-2012, 05:39 PM   #14
bajaburro
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women

loose valves,loose women,good.got that now?
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Old 05-05-2012, 09:30 PM   #15
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Likely no harm done, a compression check to compare left to right should answer the question.
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