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What am I doing wrong?


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#1 bbuckler OFFLINE  

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Posted September 03, 2016 - 07:13 PM

The valves on my SS15 is 0.25 and they need to be at max 0.09. I been up there for a hour and a half using coarse lapping compond and not seeing any results. 



#2 ol' stonebreaker ONLINE  

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Posted September 03, 2016 - 08:20 PM

  I'll assume you meant 0.025" and 0.009". If these are new valves make sure they're the right ones. If so then you may have to have someone w/ a valve grinder take some out of the seats 'cause 0.016" is a lot to remove lapping and it might throw off the geometry between the valve and seat. 

                               Mike


Edited by ol' stonebreaker, September 03, 2016 - 08:48 PM.

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#3 bbuckler OFFLINE  

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Posted September 03, 2016 - 08:21 PM

It was a metric feeler gauge
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#4 ckjakline OFFLINE  

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Posted September 03, 2016 - 08:53 PM

The valves on my SS15 is 0.25 and they need to be at max 0.09. I been up there for a hour and a half using coarse lapping compond and not seeing any results. 

 

Is your tolerance in metric also? 250 microns = .010"



#5 Bill 76 ONLINE  

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Posted September 04, 2016 - 03:10 AM

unless my math is wrong you have to take off .006 thousandths of an inch--.0063 to be precise

or  .16 millimeter   you will be lapping for days  to remove that. 

Take the valve in and have them grind the face down a touch. If they go to far it's much easier to stone down the tip of the stem to get your clearance back. 


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#6 bbuckler OFFLINE  

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Posted September 04, 2016 - 08:39 AM

I grab the wrong feeler gauge out of the toolbox

#7 Lmiller3358 OFFLINE  

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Posted September 04, 2016 - 08:47 AM

I grab the wrong feeler gauge out of the toolbox

They were next to the metric pliers, right ?


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#8 EricFromPa ONLINE  

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Posted September 04, 2016 - 10:12 AM

Valve clearance on a Cast Iron Briggs should be in Inches Intake .007 / .009 exhaust .017 / .019

 

If anything your Intake valve stem might need a little grinding.Mine was to tight after lapping them so I had to take it out and touch it on the grinder.

 

If the intake valve is to tight like mine was it will cough and sputter and you will see an abnormal amount of seepage from every gasket and small hole in the carburetor.Comes from the valve not closing tight enough and it pressurizes the carb.


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