Hello,Need your thoughts! f-400 gas engine totally rebuilt by my machine shop. Running engine short periods while restoring tractor. Had it running 3/4 throttle about 1 hr.noticed condensation drips from breather tube. spun oil fill cap off and saw quite a bit of white scum built up around screen. pulled dip stick oil appears very clean no sign of milky.My question ; do you think its condensation or do I have a water leak somewhere? T.I.A. Tony
- Thread starter redgems
- Start date
Hello,Need your thoughts! f-400 gas engine totally rebuilt by my machine shop. Running engine short periods while restoring tractor. Had it running 3/4 throttle about 1 hr.noticed condensation drips from breather tube. spun oil fill cap off and saw quite a bit of white scum built up around screen. pulled dip stick oil appears very clean no sign of milky.My question ; do you think its condensation or do I have a water leak somewhere? T.I.A. Tony
If no milky oil in the crank case, its probobly just condensation. I noticed on my cub I get a lot of condensation around the breather cap and really not sure why or how it happens. keep in eye on the crankcase oil and if it gets milky you may need a new head gasket, or check for a crack somewhwere. I know the cub has 0 pressure on the cooling system, not sure about the other models. Good luck, hope its not anything major.
Tom Fleming
Well-known Member
Redgems, sounds like condensation to me. One of the hardest things on an engine is short runs that don't totally bring it up to operating temp.
While I don't think that anything is amiss here, I would certainly run this puppy up to temp and keep her there for at least 30 mins. Condensation in the crankcase is NOT uncommon for tractors that don't get a regular workout. Not sure if you have some work for it to do, but I would certainly work it a bit, easy at first to run the rings and cam in, then REALLY put her to work. See if you condensation goes away.
comments on the re-tourque of the head are appropriate which of course also require checking/setting the valve lash. However, check with the machine shop that did your work to see what kind of head gasket was used. some require re-tourque, some don't. guessing is NOT the way to go here...................
While I don't think that anything is amiss here, I would certainly run this puppy up to temp and keep her there for at least 30 mins. Condensation in the crankcase is NOT uncommon for tractors that don't get a regular workout. Not sure if you have some work for it to do, but I would certainly work it a bit, easy at first to run the rings and cam in, then REALLY put her to work. See if you condensation goes away.
comments on the re-tourque of the head are appropriate which of course also require checking/setting the valve lash. However, check with the machine shop that did your work to see what kind of head gasket was used. some require re-tourque, some don't. guessing is NOT the way to go here...................
Wayne in MN
Well-known Member
Cover the grill/radiator to get the engine up to normal temp. The engine pulls in a lot of cold air when running.
A new original style thermostat will be a big help also.
A new original style thermostat will be a big help also.
gene bender
Well-known Member
In cold weather you will find that on any engine running like what you have nothing to get worried about.
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