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Found the problem


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#1 bbuckler OFFLINE  

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Posted August 28, 2016 - 07:38 PM

Did a leak down test on my SS15 it showing 50% leak and I hear it out of the intake. I think I did get it lapped right.

#2 MiCarl ONLINE  

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Posted August 28, 2016 - 08:37 PM

Double check your valve lash before you go looking for other issues.


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#3 ol' stonebreaker OFFLINE  

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Posted August 28, 2016 - 09:03 PM

  If the lash is OK remove the valve, coat the seat w/ a black magic marker. Rotate the valve like you're lapping it and there shouldn't be any marker all the way across seat at any point.

                                           Mike 


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#4 bbuckler OFFLINE  

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Posted September 03, 2016 - 04:10 PM

Valves are showing 0.25 at TDC when it should be 0.09 max. Do I lap them some more to fix it ? 



#5 MH81 ONLINE  

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Posted September 04, 2016 - 06:43 AM

The extra gap shouldn't be causing a leak? Or am I missing something?
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#6 MiCarl ONLINE  

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Posted September 04, 2016 - 06:46 AM

Loose valves won't cause leaking - tight ones leak.

If it's leaking with clearance then you've either got something between the valve and seat, valve too tight in the guide or poor fit between valve and seat.
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#7 gopher OFFLINE  

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Posted September 04, 2016 - 08:44 AM

My first thought was bent valve stem.



#8 bbuckler OFFLINE  

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Posted September 04, 2016 - 09:12 AM

The extra gap shouldn't be causing a leak? Or am I missing something?

it was not fully at top dead center. But I did find the exhaust valve doesn't have a enough clearance.

#9 Bruce Dorsi ONLINE  

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Posted September 04, 2016 - 09:16 AM

it was not fully at top dead center. But I did find the exhaust valve doesn't have a enough clearance.

 

Be careful when checking valve clearances, as some compression releases will create false clearance readings.

 

The FOOLPROOF way to check clearances is: 

 

With the intake valve fully raised, check & set the exhaust valve.

 

With the exhaust valve fully raised, check & set the intake valve.

 

Doing it this way eliminates any possibility of compression relief interfering.


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#10 bbuckler OFFLINE  

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Posted September 04, 2016 - 07:05 PM

Be careful when checking valve clearances, as some compression releases will create false clearance readings.

 

The FOOLPROOF way to check clearances is: 

 

With the intake valve fully raised, check & set the exhaust valve.

 

With the exhaust valve fully raised, check & set the intake valve.

 

Doing it this way eliminates any possibility of compression relief interfering.

I re tested with the valves raised. the intake tested ok and the exhaust could use a little more lapping


Edited by bbuckler, September 04, 2016 - 07:21 PM.





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