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Kohler 7000 crankcase pressure?

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Bird of prey

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Discussion starter · #1 ·
On a Kohler 7000 V Twin, should the crankcase have a lot of pressure? Engine has good compression on both cyls.
If you remove the dipstick at idle, it throws a lot of oil out.
Is this normal?
I think the motors running hot
Any recommendations for a temp gauge?
Thanks in advance.
 
#3 ·
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Discussion starter · #4 ·
nojak said:
There should be a breather tube from the crankcase or valve cover that goes to the intake. Sounds like this is clogged or collapsed.
Item 27 on this page: https://www.ereplacementparts.com/kohler-kt7303012-engine-parts-c-106503_106533_286057.html

As for hot, I'd pick up a cheap infrared thermometer like this and use that to check the cylinder head temps.
Click to expand...
Any particular spot on head to ck. Temp? Mostly shrouded.
What is max temp?
I've got a infrared thermometer.
Thanks
 
#5 ·
Good question. I'm not really sure.
I should grab mine and check my various small engines after giving them a good thrashing, figuratively speaking. Or you could check other engines you have and compare, trying to check them at the same place on the engine. I figure most air cooled small engines should run at similar temperatures, but I'm really just guessing. No idea how 2 vs. 4 stroke affects this
All will be hottest at the exhaust valve, cooler on the cylinder walls, at least for 4 stroke engines.
 
#7 ·
actually you check the temp right below the cylinder head face where the bore starts as thats the hottest spot as thats were the flame starts to expand and throws the heat , as for temp , I cannot find my book but VW and also Pratt-Whitney published a chart of temps for safe operation on air cooled IIRC its around 425*F ,
if you keep the air flow clear ( clean fins and fan cover pull the covers off about 1/2 way thru the season and check them as there are some small ports that plug up from fine grass and dust ) then you only have to worry about the heat of the oil , as when it gets hot it cokes ( turns to carbon ) and it will cut metal real good ) so a good High temp oil in in order like A H-D uses , some people prefer 20-50 , a low ash diesel oil ( like rotella , delo ), is good as they are made for high heat of diesels
 
#9 ·
Bird of prey said:
On a Kohler 7000 V Twin, should the crankcase have a lot of pressure? Engine has good compression on both cyls.
If you remove the dipstick at idle, it throws a lot of oil out.
Is this normal?
I think the motors running hot
Any recommendations for a temp gauge?
Thanks in advance.
Click to expand...
Why would you remove the dipstick while the engine is running?
 
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#11 ·
Taking the oil filler cap off an idling diesel is an easy way to check the rings. If it is puffing out like a steam locomotive, time for an overhaul as you have way too much blow-by.
And that reminds me, I should check the Kubota in my Bobcat.
 
Discussion starter · #12 ·
nojak said:
Taking the oil filler cap off an idling diesel is an easy way to check the rings. If it is puffing out like a steam locomotive, time for an overhaul as you have way too much blow-by.
And that reminds me, I should check the Kubota in my Bobcat.
Click to expand...
Years ago my brother in aw bought a Ford van with a straight 6, without asking me to check it out. Had a dead cyl. 1st. Thing I dd was pull vc cap.
Think it had as much compression as 5 of the cylinders. Hole in piston.
People think I'm crazy to take dipstick out of running motor.
 
#15 ·
If you take the dipstick out while the engine is running it will for sure blow out air and oil. It's basically a sealed system designed to keep air out. When you take out the dipstick you open up the system sucking in a lot of air when the piston goes up the bore. When the piston comes back down the bore that air has to go somewhere and it comes right back out the dipstick tube. Perfectly normal. As far as running hot. Look at how the spark plugs are burning. Do they look normal or are they grey/white and ashy looking? If they look normal and there is nothing blocking the intake air such as built up grass and debris then it isn't running hot in my opinion.
 
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Discussion starter · #16 ·
VegetiveSteam said:
If you take the dipstick out while the engine is running it will for sure blow out air and oil. It's basically a sealed system designed to keep air out. When you take out the dipstick you open up the system sucking in a lot of air when the piston goes up the bore. When the piston comes back down the bore that air has to go somewhere and it comes right back out the dipstick tube. Perfectly normal. As far as running hot. Look at how the spark plugs are burning. Do they look normal or are they grey/white and ashy looking? If they look normal and there is nothing blocking the intake air such as built up grass and debris then it isn't running hot in my opinion.
Click to expand...
Bought a 12" dial thermometer.(forchecking deep fry oil) Checked oil temp right after shutdown. 225 degrees. Looks like I'm good to go.
 
#17 ·
Bird of prey said:
Bought a 12" dial thermometer.(forchecking deep fry oil) Checked oil temp right after shutdown. 225 degrees. Looks like I'm good to go.
Click to expand...
During the summer months oil temp between 275 and 300 is not unheard of. Anything below 320 isn't a concern.
 
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