Presurized Crankcase

   / Presurized Crankcase #1  

JazzDad

Gold Member
Joined
Jul 11, 2003
Messages
425
Location
In the city now.
Tractor
Main: Case 235
I called Briggs and Stratton, and must have gotten today's new hire. (In the past, these folks had been very helpful.)

Got a mower given to me. It had sat up for years. Cleaned the carb and got it running. Engine had run for about 30 minutes, when oil began spewing out the filler/ dipstick neck. The dipstick was in place, and the gasket intact. I looked on the 'Net and found bad head gaskets to be a frequent culprit on these small OHV engines. (Combustion gasses leak from the cylinder into the valve chamber.) I examined the head gasket, and can't see any breach. Now I'm wondering if there is blow-by on the rings. Compression test yields hardly any reading on the gauge. And yet the engine starts easily, seems to run strong, and does not smoke.

Do I try the easy item first - the head gasket - or tear it down to look at the rings? (The cylinder wall is not scored at all.)
 
   / Presurized Crankcase #2  
Now I'm wondering if there is blow-by on the rings. Compression test yields hardly any reading on the gauge. And yet the engine starts easily, seems to run strong, and does not smoke.

Just how easy does it pull?
Dipstick smell like gas?
 
   / Presurized Crankcase
  • Thread Starter
#3  
No fuel in the oil. It pulls very easily, but yet it runs well. :confused:

Only complaint is the oil blowing out. The engine can't last long that-a-way.

More reading is leading me to think the breather is malfunctioning. (Never seen a bad one in my years of piddling around on these engines. And why would it suddenly stop working?) I will check that tonight.
 
   / Presurized Crankcase #4  
Pinched crankcase breather hose that goes to carb or air filter?
 
   / Presurized Crankcase
  • Thread Starter
#5  
Breather hose is fine, but that doesn't mean a mud dauber didn't get down in there. I will try to blow some compressed air in the metal tube portion.
 
   / Presurized Crankcase
  • Thread Starter
#6  
Ding - ding - ding; ruffdog wins the cigar!

This is where the metal breather line has crossed over the engine and attaches to the breather.

Mud.JPG

A puff of compressed air, reassembly, and it runs great.

Thank you, Ruff!
 
   / Presurized Crankcase #7  
I'm happy to help out.....you did all the work though. Good job!
 

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