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Moisture in Crankcase
https://slantsix.org/forum/viewtopic.php?t=21715		 Page 1 of 1
Author:  Davey [ Fri Feb 02, 2007 5:39 am ]
Post subject:  Moisture in Crankcase
Hey fellers. I just bought a 71 D100 with a slant six in it that runs fine, but it had been setting for a couple of months before I got it last week and began driving it. The first time I removed the oil cap I noticed a little emulsified oil and water underneath the oil cap. Now, after I've put a few hundred miles on it, I notice that there is usually a small trace of emulsified oil and water (whitish thick looking stuff) on the edge of the dipstick. There is the normal clear oil on the stick and this little trace of oil/water emulsification. What's up with that? I've been driving this truck at highway speeds for 30 minutes at a time, and it warms up correctly...I'd have thought it would have cooked moisture out of the crankcase left from sitting for those months. It is not losing any coolant, or making any extra oil. The pcv system on the truck is suspect, and I haven't had time to ensure the crankcase is being vented properly. (In other words, I haven't checked all the pcv lines for integrity and correct connections) Any suggestions? Davey
Author:  Charrlie_S [ Fri Feb 02, 2007 6:20 am ]
Post subject:  Re: Moisture in Crankcase
Quote:
The pcv system on the truck is suspect, and I haven't had time to ensure the crankcase is being vented properly. (In other words, I haven't checked all the pcv lines for integrity and correct connections) Any suggestions? Davey
You have, most likely found your problem. Repair the PCV system. Check the hose. Common problem. Make sure the passage in the carb, the PCV hose connects to is not plugged. You might have to remove the carb, and use a drill bit, by hand, to clean out the carbon. This passage makes a 90 degree turn in the carb. Also make sure the carb to manifol gasket is the correct one, and installed properly. The small round passage in the gasket must line uo with the hole in the manifold.
Author:  1969ronnie [ Fri Feb 02, 2007 8:40 pm ]
Post subject: 
hi, also what state are you in? cold -northern states will do that more in the winter, not so much down south-warmer states. i have to run 5w-30 in the winter to help get some more oil splash up top .what temp therm do you have? ron
Author:  MitchB [ Sat Feb 03, 2007 4:44 am ]
Post subject: 
Your PCV system must be working correctly. You should run the engine coolant temp at 190 - 195. It will also help if you allow a warm-up period before you drive the car.

If you have excessive blow-by, then this will overwhelm the PCV system and a simple fix will not be available.

Mitch
Author:  Davey [ Sat Feb 03, 2007 6:40 am ]
Post subject:  .
I'm in South Carolina, and it has been wet and cold here lately. Also, the motor in this truck is sort of tired. I haven't noted excessive blowby, but it may indeed have it, I just haven't noticed. It smokes a little on startup, but seems to stop after warmed up. I'm going to continue to drive it, and refresh the PCV system when I get time. Dave
Author:  SlantSixDan [ Sat Feb 03, 2007 6:51 am ]
Post subject: 
In South Carolina, with an engine in basically good shape, 10w30 engine oil and a 180° thermostat are going to be your wisest picks. A little bit of moisture emulsion at the very top of the engine is normal, particularly if it's used mostly for short trips. That is, after all, the coldest part of the crankcase, and there's going to be a little condensation. If the PCV system is working correctly (check and service the whole system! Hoses, grommets, valve, breather, and the carburetor PCV inlet pipe and passages), and if the emulsion isn't present after a decent highway run, there's nothing to worry about. Large globs of "engine mayonnaise" would be something to worry about, but it doesn't sound like that's what you're facing.
Author:  Ssg Pohlman [ Sun Nov 24, 2013 7:09 pm ]
Post subject:  Continuation
Well the Search function works again!

Thanks to aggressive Ted and his oil/water separator idea, I had installed one on my truck when I swapped engines not long ago. And what do ya know it works, only thing is that the sight tube shows and real light almost tan color and not my synthetic oil. So to the search function I went.

Recently starting work again puts me at a short commute so it seems I'm having condensation show up. The question I had was that when I come home of a night and pull into the garage, I normally get out and lift the hood to let the engine cool easier and warms the garage a lil too.

Would this make it worse as well to open the hood, should I just leave it closed?

Edit: nothing like bring a dead thread back to life. :shock:
Author:  Aggressive Ted [ Wed Nov 27, 2013 11:15 am ]
Post subject: 
I would leave your hood closed.
Your not running any oil additives or thickeners are you? like STP or other thickeners.....
Sometimes they will make a foaming milkshake much worse.

The water can separate and evaporate from straight oil or synthetic oils much easier.
If you have it in the garage, you can pull the oil filler cap at night to let the water vapor out. Just keep the cap on the dash so you remember to reinstall it in the morning.
Author:  Ssg Pohlman [ Wed Nov 27, 2013 7:00 pm ]
Post subject: 
Nip no thickeners since it's a fresh rebuild and getting cold here. (18 tonight) have been running the nextgen 5w-30 synthetic so far. I did leave the hood closed upon returning home last few nights and went back out later to plug in my timed block heater. It so far has cleaned up the slight foam under the oil cap which is good. So far I like the block heater, now if only I could find a place o plug in while at work :twisted:
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