Valve shims conundrum

[MidnightSE]

Since I cannot ride, rotator calf recovery, I wanted to perform deep dive and check-adjust valves. Not a hugely big job, but...
After measuring valves, min vs max feeler gauge approach, I've determined pretty much all valves are under.
 
My question is how critical is it to go beyond max setting on valve clearance on Hinckley triple engines?

For example. The Exhaust valve clearance is .10mm and the shim is 2.30mm. If I use 2.25mm shim would it not send the setting above the max .13mm?

I've used online shim calculator to get results.  And according to calculation, in the above case I should use 2.28mm shim to bring it up to within spec valve clearance.

What do you guys think?

P.S
Hot Cams doesn't make shims in .01mm increments, only 0.5mm

Cheers...

[nert]

I didn’t consult my service book, but recently having adjusted my valves, I thought intake clearance is .100 to .150, exhaust .275 to .325?

[Coconut]

Confirmed that the Service Manual ( Chapter 3 Page 18 ) states :
 

Inlet 0.10 to 0.15mm
Exhaust 0.275 to 0.325mm

As the components wear, due to the design,
the valve clearance will REDUCE.

I don't understand the comment : "...would it not send the setting above the max .13mm?"

PLEASE NOTE : It is incredibly easy to get the Maths wrong here !
I have never adjusted the valve clearances on my Trophy
and I urge you to CHECK with an independent reliable / qualified source
that the following information is correct BEFORE using it to adjust your valves ! ! !


When the measured Clearance is too small, you need to replace the shim
with a SMALLER one - which will therefore INCREASE the amount of clearance.

e.g. Measured Clearance ( Exhaust ) = 0.10mm, Shim installed is 2.30mm.

The Required Clearance = 0.275mm to 0.325mm so your actual clearance of 0.10mm
is between 0.175mm ( 0.275 minus 0.10 ) to 0.225mm ( 0.325 minus 0.10 ) smaller than specified.

To adjust the clearance to within specification you need to replace the current shim
with one that is between 2.125mm ( 2.3 minus 0.175 ) and 2.075mm ( 2.3 minus 0.225 )



Again quoting from the Service Manual :

Camshaft, valve, shim and valve seat wear affects the
valve clearances.  The effect of this wear is to change the
gap between the camshaft and tappet bucket, causing
engine noise and improper running.  If the valve
clearances become too small, permanent danage to the
valve and valve seat will take place.  If the valve clearance
becomes too great, the engine will become noisy and will
not run correctly.

Other than from Triumph, "Pro-X" in the U.S. have 9.5mm diameter Valve shims in 0.025 increments.

Cheers 

[MidnightSE]

My bad, I mixed up SAE and Metric.
It is not .10 mm it is .10 inches which is .254mm. Which is still below min spec of .275mm
So to bring it back up to max clearance of .325 I will need -070mm shim. (.325-.254)
Given existing shim is 2.30mm, I need to subtract .070mm from it. So the shim of 2.25 mm would bring the clearance closer to .325mm clearance.

Does it sound plausible?

Cheers...

[janfmiller]

Be sure and measure the OLD shim, to be sure you are starting with the correct shim thickness.
Just a good habit... 

[nert]

When performing a valve adjustment at 24k, my valves were tight. At my 74k adjustment, the valves were loose. Each time needing to have shims replaced. And rechecked before completing assembly.

As the components wear, due to the design,
the valve clearance will REDUCE.

.

Valve clearance changes due to wear in several areas of the valve train. Newly built heads will be more prone to clearance reducing as the thin margin area on the valve seat begins to "pound in" allowing the valve to sit deeper in the seat, and the stem section to sit taller towards the inverted bucket. This action will slow as the valve margin widens, due to increased margin surface area will more easily resist accelerated seat area deforming. The remainder of the valve train also experiences wear, (loss of metal) on the bucket surface, the cam lobe and the cam upper bearing journal all allowing clearances to increase. That wear will continue for the life of the engine. Engines that use rockers and push rods have additional areas of contact and wear and may increase valve clearance at a faster rate.

[trophied]

I can't help it, gotta love me some hydraulic lash adjusters!  If Harley did it with a high RPM redline like the Pan America, everybody CAN do it.

[MidnightSE]

Revolution Max engine is a marvel of engineering for sure.