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Author Topic: Adjusting valve clearances  (Read 5248 times)

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Offline TomL

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Adjusting valve clearances
« on: October 08, 2015, 12:13:17 am »
I'm awaiting a new set of plugs for the bike and with most of the gubbins out of the way decided to check the valve clearances.

I need to reshim five inlet valves and two exhaust valves. Will order three new shims tomorrow and play musical chairs with the other four shims to set the clearances within tolerance. All clearances are on the wide side.

Had to make a couple of hold down tools to keep the camshafts in position as the camshaft clamp nuts are removed. Made them out of a couple of old spark plugs with the electrodes and porcelain removed and some studding. Worked surprisingly well.

Have recorded the sizes and positions of all the spherical spacers which will allow me to order in the required shims before the camshafts are removed on future services.

I wonder how carefully the valve clearances are checked at the dealers? Suspicious that the valves rarely require adjustment or am I being cynical.
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Offline Timbox

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Re: Adjusting valve clearances
« Reply #1 on: October 08, 2015, 07:40:31 am »
All wide then?  Thats good In my book, no valve seat wear, was it noticeably noisy would you say Tom?
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Offline Phmode

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Re: Adjusting valve clearances
« Reply #2 on: October 08, 2015, 10:24:51 am »
Not a cynical bone in your body Tom!

Brian (who wonders if the valve check is done by ear in some dealerships  :o )
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Offline drumwrecker

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Re: Adjusting valve clearances
« Reply #3 on: October 08, 2015, 12:45:12 pm »
I heard that  a Honda workshop did a compression test and if OK said the VTEC valves had been checked and OK. How true that is is anyone's guess
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Offline TomL

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Re: Adjusting valve clearances
« Reply #4 on: October 08, 2015, 02:23:31 pm »
Not noisy but they needed doing with six of them .001" over maximum and one .002" too wide.
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Offline Costas

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Re: Adjusting valve clearances
« Reply #5 on: October 08, 2015, 02:28:12 pm »
Tom here is what my bikes valve setting last Jan.

Rec IN 20-28 Factory set 26
Rec OUT 30-40 Factory set 38
ZV 65727 XXO0555 CLIENT CODE 002191
BIKE VALVE CLEARANCE AT 32000KMS JAN 2015 bike manufactured Jan 2009.

IN 24-25/26-26/25-25/25-25
        1       2        3        4         CYLINDERS
OUT 37-38/37-38/38-37/38-38

Well within factory specs. No additional job is required.

What were your valve setting for comparison?
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Offline TomL

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Re: Adjusting valve clearances
« Reply #6 on: October 08, 2015, 04:53:14 pm »
My cranked feelers are imperial hence the imperial measurements

.011" .011" / .012" .012" /  .013" .012" / .011" .012" (inlet should be .007"-.011")

       1                   2                    3                    4                CYLINDERS

.016" .015" / .015" .016" / .017" .017" / .016" .016" (exhaust should be .012"-.016")

Amazingly the dealer had shims in stock. Still waiting for the spark plugs off ebay. I won't pay the dealer the exorbitant price that they want for plugs.

BTW the Reprom shows 0.18mm-0.28mm for inlet.
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Offline Costas

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Re: Adjusting valve clearances
« Reply #7 on: October 08, 2015, 05:55:05 pm »
Thanks for reply.
You need new shims.
Are you going for DENSO spark plugs?
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Offline TomL

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Re: Adjusting valve clearances
« Reply #8 on: October 08, 2015, 06:35:10 pm »
NGK plugs for me.
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Offline Timbox

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Re: Adjusting valve clearances
« Reply #9 on: October 08, 2015, 06:38:26 pm »
oh no, I feel a spark plug thread coming on, personally I always preferred Brisk in the Boxer ;)
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Offline Costas

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  • Location:: Athens, Greece, KS-Loutsa 37°58'16.6"N 23°59'06.8"E 37.971269, 23.985224
Re: Adjusting valve clearances
« Reply #10 on: October 08, 2015, 07:19:55 pm »
Oh YES :-*
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