02-28-2018, 06:56 PM | #1 |
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Foamy Residue
I have a 1950 Ford with an 8BA stock engine. I run Rotella 15-40 detergent oil with a small amount of MM oil added. When I drive the car, 10 or more miles, the oil filler tube cap shows a foamy yellowish residue. The foam feels oily with the moisture droplets showing The same residue drips off the draft tube also after the drive. Any ideas about the reason for this, is it the oil? Are the moisture droplets simply the moisture accumulated inside the engine? If I drove the car farther would the foam/moisture burn out? Thanks in advance for your thoughts.
Ford Ranger
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02-28-2018, 07:12 PM | #2 |
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Re: Foamy Residue
A bit of blowby maybe. Seems kinda normal. The more you drive it, probably less you're gonna see. Jack E/NJ
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02-28-2018, 07:16 PM | #3 |
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Re: Foamy Residue
I'm thinking you're not getting it up to proper operating temperature for a long enough period of time....
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02-28-2018, 07:28 PM | #4 |
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Re: Foamy Residue
What petehoovie says. Also, does it have thermostats, what temp? Coolant level staying o k?
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02-28-2018, 08:12 PM | #5 |
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Re: Foamy Residue
Yes, the engine has thermostats, the operating temperature runs in the normal range. I would think 10 miles of driving would dry out an engine, maybe I need to drive it 50 miles and then check it.
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02-28-2018, 08:31 PM | #6 |
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Re: Foamy Residue
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02-28-2018, 08:36 PM | #7 |
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Re: Foamy Residue
have you added any water/antifreeze to engine lately?, smell any antifreeze at the tailpipe? any sparkplug show signs of water? or maybe just different from the others? these are things I would check on. but you definitly have a moisture problem. road draft tube not blocked, fill cap not plugged up with dirt. drive the engine with a piece of cardboard in front of radiator to raise temp a little, not a big, just maybe 8" square
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02-28-2018, 08:38 PM | #8 |
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Re: Foamy Residue
If you look at the cap is it all rusty and crappy looking inside too? sounds like you need to run it at temperature for longer. Condensation is happening.
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02-28-2018, 09:21 PM | #9 |
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Re: Foamy Residue
Just to be sure there is not a serious coolant leak into the oil, - Does the oil on the dipstick look normal? Not a little creamy?
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03-01-2018, 09:10 AM | #10 |
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Re: Foamy Residue
Check the crankcase vent system. Could be a blocked draft tube or a clogged mesh in the oil filler cap.
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03-01-2018, 03:24 PM | #11 |
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Re: Foamy Residue
There is no smell of anti-freeze from the tail pipes, the oil on the dipstick is clear, yesterday I soaked the oil filler cap, seemed to be dirty, possibly was not vented if it was too dirty. Thank you for your responses
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03-01-2018, 04:15 PM | #12 |
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Re: Foamy Residue
Let up know what you find fixes the problem.
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03-01-2018, 04:22 PM | #13 |
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Re: Foamy Residue
I ran the car today, did not drive it, just warmed it up in the shop, and inspected the moisture coming out of the tail pipes. The moisture was clear, no antifreeze odor. And, the oil fill breather seems to be clear now, blow-by fumes escape there and are dissipated by the fan stream of air. Will drive the car quite a few miles to see if the foam disappears.
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03-01-2018, 05:15 PM | #14 |
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Re: Foamy Residue
In my last post I failed to mention the oil is clean, no moisture on the dip stick, and there are no bubbles in the radiator when the car is running. I do not think there is an antifreeze leak into the firing chambers. Does the draft tube and the oil filler tube vent blow-by from the the same parts of the engine? It would seem the draft tube would vent the upper part where the tappets are, and the oil filler tube would vent the lower part where the pan and crankshaft operate. Or are then somehow connected?
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03-01-2018, 05:17 PM | #15 |
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Re: Foamy Residue
Might get that thermal heat reading gun so you know what temp your up to for your test run. They can be found for very little cost.
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03-01-2018, 05:36 PM | #16 | |
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Re: Foamy Residue
Quote:
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03-01-2018, 05:51 PM | #17 |
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Re: Foamy Residue
Here is the general principle of a road draft ventilation system.
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03-01-2018, 06:07 PM | #18 |
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Re: Foamy Residue
Thank you guys, I think my problem was a clogged oil filler cap which did not allow for the draft tube to do it's work. I understand the system now. I have owned the car for a number of years and never cleaned the filler cap. I surely appreciate the input. Appreciated!
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03-01-2018, 08:57 PM | #19 |
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Re: Foamy Residue
Prolly all clogged up from all that foamy residue your motor makes on those short trips. 8^) Jack E/NJ
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03-01-2018, 10:45 PM | #20 |
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Re: Foamy Residue
Your welcome
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