oil leak problem
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oil leak problem
I got to looking under the hood of my 79 f 150 w/ 400. It has a edelbrock performer non egr manifold. At the back of the manifold is where the vacuum comes from correct? It is a thing that splits into 4 or 5 different fittings or w/e u call them and there are 2 hooked up and the rest blocked off. One i noticed goes to the brake booster . the fitting in the manifold is not tight and i have to take off the hoses so i can tighten it then reconnect it. I noticed there was oil around the base of the fitting on the manifold. then with the motor running i poped off one of the caps and put my finger on it and i got oil on my finger. Is this supposed to happen or is this a bad thing? The reason i am asking is it has been using oil since being rebuilt. not much but a little bit
Postmaster
Joined: Jun 2003
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From: WA
that is not normal. I wonder if it is oil or tranny fluid? Your modulator on the tranny (assuming auto) can leak internally, and pull tranny fluid into the vaccuum hose that goes up the vaccuum tree on the manifold.
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Not tranny fluid it is a manual. I almost wonder if it is brake fluid but i dont this it is. it is a edelbrock performer manifold and holley 750. The oil or w/e is coming from the vacuum tree on the back of the manifold.
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no it is not. the pvc goes into the back of the carb. with the tree being loose would it hurt the motor's performance or anything? to tighten it i am going to have to take off the back fuel rail going into the carb because as i go to tighten the tree down it hits the fuel rail. and i also will have to get a longer hose to go from the tree to the brake booster it appears. it will depend on how much i can tighten it. the other vacuum hose i believe goes to the black coffee can or w/e u feel like calling it.
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another thing i just thought of is that the air filter gets dirty very quickly. It almost looks like there might be some oil in it but i am unsure. I live in the country so i am on dusty roads a lot but it doesnt look like dirt. couldnt edit my post because the edit button will not show up.
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Hotshot
Joined: Dec 2003
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From: iowa
if you run it loose you are creating a vacumn leak on one cyl. this will not only cause a loss of power but if it is severe enough could burn a valve or a piston. on the air cleaner getting dirty possibly with oil make sure you pcv valve is working and not stuck closed or you could be getting blowby back through the vent. also on the T fitting oil issue are you loosing any brake fluid if the brake master cyl is leaking slightly it would be sucked into that. alos look in the hoses, ans see if any of them have any oil or fluid in them if they do then that is where it's coming from and trace back to find it if they are dry internally then it's coming up through the manifold somehow, and that is definatly not normal either.
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well i checked the pcv valve and it is working properly. It has suction and i can hear it when i shake it so that is alright. Will check everything tomorrow and hopefully solve this problem. I have been losing a little brake fluid too so i will check that out tomorrow. any other suggestions or help will be appreciated.... keep it coming lol
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From: springstead
when you rebuilt did you put your valley pan back in underneath the intake. the valley pan deflects oil from reaching the bottom of the intake. thats what it sounds like to me, although i cant remember if the vacuum "port" on the intake goes to the head or not, i dont think so, i could be wrong. thats my guess anyway.
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From: iowa
The valley pan would have virtually no affect on the inside of the intake if that valley pan was keeping oil out of the intake runners, and away from that fitting then you would have a hole in your intake meaning MAJOR oil leak, the purpose of the valley pan is to keep hot oil from heating up the intake itself, and if it is leaking at the heads it still shouldn't be getting to the fitting, and that really wouldn't matter which type of gaskets bieng used
you said that you are leaking brake fluid so that is the first place I would start looking take the vac hose of the booster,a dn see if it is wet if so then remove the master cyl, and see if the back side of it is wet (you can unbolt it, and pull it far enough to check without removing the lines) if it is then replace the MC. If not then we need to continue this discussion but just where I would start.
you said that you are leaking brake fluid so that is the first place I would start looking take the vac hose of the booster,a dn see if it is wet if so then remove the master cyl, and see if the back side of it is wet (you can unbolt it, and pull it far enough to check without removing the lines) if it is then replace the MC. If not then we need to continue this discussion but just where I would start.