my 1987 bronco (carburated) when i take off my air filter lid there is motor oil puddles in the bottom of the filter pan, the oil is coming through the vent tube that goes from the valve cover to the air filter housing. im not sure of the problem.
what should i do???
Oil In My Air Filter
Started by
Guest_87Bronco351_*
, Feb 28 2004 06:19 PM
25 replies to this topic
#3
Justshootme84
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Posted 28 February 2004 - 10:34 PM
While you're changing the PCV valve, remove and clean the hose and metal tube that comes from the manifold to the PCV valve. It can get clogged with oil sludge. Your crankcase has too much pressure, that's why it's blowing oil into the air filter.
1984 Bronco XLT, 351W H.O., C-6 AT, Ford 9", SkyJ 6" lift, 35" tires on MT Classic rims, S&W Racecars 10-pt cage kit, custom "shaker" assembly.
1988 Bronco Custom, 302 EFI, C-6 AT, Ford 8.8". parting out
1986 Bronco Custom, 300I-6, NP435
1988 Bronco Custom, 302 EFI, C-6 AT, Ford 8.8". parting out
1986 Bronco Custom, 300I-6, NP435
#5
highboy73
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Posted 29 February 2004 - 06:05 PM
the only problem with running it under the car is that all the oil is gonna be all over underneath you car.
you have blow-by.you can rebuild the engine,buy some re build in the can,run a thicker oil,try some lucas.
all motors have some blow by,sounds like yours has a bunch,I'd put in the new pvc vavle,and clean it all up,and run some thicker oil.
if you are runningh 10w 30 try 40 then 20w 50
don't waste your money on synthetic I've ran it in old motors and it made it worse.
it's good stuff but not in an old wornout motor
if you really want to find out why it's doing it try a compression test,and check your plugs
you have blow-by.you can rebuild the engine,buy some re build in the can,run a thicker oil,try some lucas.
all motors have some blow by,sounds like yours has a bunch,I'd put in the new pvc vavle,and clean it all up,and run some thicker oil.
if you are runningh 10w 30 try 40 then 20w 50
don't waste your money on synthetic I've ran it in old motors and it made it worse.
it's good stuff but not in an old wornout motor
if you really want to find out why it's doing it try a compression test,and check your plugs
#8
Guest_Raven_*
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Posted 01 March 2004 - 01:37 PM
yea if the PCV is stuck open it will allow it to feed right through to the AF if you take it off there should be a spring push plunger that stays up when you turn it over it will move a little but not a lot if it doesn't move at all or if it just falls then it is bad ..
#9
Guest_Gunner_*
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Posted 02 March 2004 - 06:31 AM
i have said it before in a previous topis i will say it again here. f the pcv. it is a pain in the arse. get your self a set of edelbrock valve covers they aren't that expensive and it does away with the pcv problem. the oil cap actually has a filter to act like a pcv and to run it under the vehicle isnt smart either because if you go fording through some agua you will restrict its breathability. so get yourself the edelbrock valve covers and do away with the hose all together. just an option
#10
Guest_amcabbott_*
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Posted 02 March 2004 - 06:46 PM
sounds like blow by your rings are worn. as above it could be the pvc ( posative crankcase ventalation valve) blow by is exhast gasses excaping past the rings during combustion and builds pressure in the crankcase(oil pan) the pvc vents off this pressure in normal use you never no its there if it clogs pressure will build up and start to vent where it can threw the valve guides or creat oil pan leaks, intake gasket leaks ,valve cover leaks and push oil into the air filter. if you replace it and you still have the problem its probibly the rings and rebuild time. you can cut back your timing and that will help it will cost you some power but may give you some more life out of the engine. or get a washable re useable air filter and run it like it is.
#11
Broncoholics
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Posted 04 March 2004 - 02:17 PM
I had this problem and found out the intake manifold gasket was blown out in the center (the two bolts that are close to each other in the middle) this allows exhaust to enter the engine and cases excessive crake case pressure. If its gets worse it can pump the oil out the dipsitck tube as well. Could also be a bad ring on a piston but I doubt it. Taking off the intake manifold is quick and easy. LEave the carb on.
Wheel it like you stole it!
#12
Guest_bronco84_*
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Posted 12 March 2004 - 09:04 AM
I have an 84 bronco with the 300 I6 that is also putting oil in the air filter through the vent tube on the oil filler cap. My motor runs on propane and I am noticing some moisture mixed with the oil. I had changed my pcv valve to no avail. I do have some oil pan leakage and had to replace my valve cover gasket. Could this be the intake manifold gasket or the ring blow-by? Or both? The truck does not burn any oil, just leaks it. 
#13
Justshootme84
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Posted 12 March 2004 - 11:44 AM
Some mechanics will tell you that when you have "blow by" or worn rings, condensation in the cylinders (when not running) can get into the oil. THe Chevy SB's are notorious for this , particularly at start-up, when you see a puff of blue smoke shoot out the exhaust. It should clear up after the motor gets warm, but if not you definitely have badly worn rings. Propane is also harder on the valve guides and seals, and you will tend to get more internal leakage. Milky or white oil is a sign of water+oil. And as the crankcase pressures build up and can't escape thru the PCV, you start blowing out gaskets. The valve covers, mains, and intake gaskets start and oil will even try to get out thru the dipstick tube.
1984 Bronco XLT, 351W H.O., C-6 AT, Ford 9", SkyJ 6" lift, 35" tires on MT Classic rims, S&W Racecars 10-pt cage kit, custom "shaker" assembly.
1988 Bronco Custom, 302 EFI, C-6 AT, Ford 8.8". parting out
1986 Bronco Custom, 300I-6, NP435
1988 Bronco Custom, 302 EFI, C-6 AT, Ford 8.8". parting out
1986 Bronco Custom, 300I-6, NP435
#15
Guest_Bronco_In_Ny_*
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Posted 13 March 2004 - 12:03 PM
is your PCV valve getting any oil in it? you might want to just vent into the open and not worry about PCV you can get small filters at autozone in the sport section where the little rice burner stuff is But it sounds Like your PCV valve needs replaced, the air is ment to enter the motor where your getting your oil and pulled thru the PCV so ten to one it needs replacing and check the hose with the PCV
But it sounds Like your PCV valve needs replaced, the air is ment to enter the motor where your getting your oil and pulled thru the PCV so ten to one it needs replacing and check the hose with the PCV
#16
Guest_bronco84_*
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Posted 14 March 2004 - 09:37 AM
Thanks Bronco in NY, I will give it a try, I'm going for a good drive today so I'll see if that makes a difference. If my rings were worn wouldn't I be seeing smoke from my exhaust all the time? maybe I will try to tighten the bolts on the intake as well.
#17
Guest_Bronco_In_Ny_*
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Posted 15 March 2004 - 02:54 PM
Just one warning about venting without keeping the PCV valve is if the motor can't vent enough pressure it could blow seals, so the best thing isto keep the PCV and just put a small filter on the tube on the oil fill. Just thought I would throw that out there.
#18
Guest_Gunner_*
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Posted 17 March 2004 - 04:36 AM
which is why i again recommend getting the edelbrck valve covers becasue the push on oil cap has a filter built into it so it does away with the whole pcv hose. your oil cap relieves the pressure and acts as the PCV and oil cap
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