Kirk Engines, Inc Cub Cadet Used Parts CADET CONNECTION Cub Cadet Specialties Cub Cadet Specialties

Exhaust valve condition on K-301

Help Support IH Cub Cadet Forum:

dsarow

Active member
Joined
Jul 13, 2014
Messages
38
Location
Near Madison Wi.
displayname
Dean W.Sarow
[ATT A
H=full]145234[/ATTACH] K-301 exhaust valve condition
I was checking the adjustments of my valves on my K-301,I thought what the heck,might pull the head and do a head gasket.Does the whitish exhaust valve mean its running lean.
 

Attachments

dfrisk

Well-known member
Joined
Nov 12, 2001
Messages
6,262
displayname
Dennis Frisk
NOT REALLY. What does the spark plug look like, black and sooty, or white, or tan/brown? What did you do last time you ran the engine, Did you run the engine at high rpm, under almost full load? There's lots and lots of guys that don't realize the difference between "full load" and "high RPM". Your engine will run 3600 rpm with NO load, the throttle valve in the carb will be only about 1/4th the way open, maybe a bit less. When mowing tall grass it's easy to run high RPM and full load, Your Kohler will really be barking at you!
Best sign of a leaky head gasket is oil drewling out the front of the cylinder head and running down the cylinder fins just to the right of the exhaust port. Sanding/grinding the head FLAT will stop that leaking. I also recommend spray painting the new head gasket with Aluminum paint before installing and torquing it to specs in the correct order shown in the service manual. Install it before the paint dries.
The exhaust valve runs tremendously hot, under full load almost white hot, that's why the accumulated carbon has turned white. Less than full load the valve runs cooler, at idle it probably only gets 300-400 degrees F.
 

dsarow

Active member
Joined
Jul 13, 2014
Messages
38
Location
Near Madison Wi.
displayname
Dean W.Sarow
Thanks Dennis
The plug is crusty black carbon,the exhaust valve a bit of wiggle in the guide.It has been using a bit of oil.I'll try to figure out how to change guide and valve.New plug will get me to winter.Since its been bored 20 over ,I'll decide this winter,30 over or sleeve it.Other wise my 125 is a great tractor.
 

dgeary

***
Joined
Jun 7, 2013
Messages
28
displayname
Dennis Geary
Whitish exhaust is normal. I'd leave the exhaust valve alone unless you're going to do a full rebuild. If any oil is getting through a valve guide, it will be the intake due to the suction on the intake stroke. Based on your plug description, sounds more like the oil is getting past the rings.
 

Latest posts

Top