Weird oil leak
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New User
Joined: Dec 2005
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Weird oil leak
Hi! I own a 66 f-250 with the 352FE motor-auto trans. I have a strange leak from the back of the engine. I replaced the intake manifold gasket and the oil pan gasket has been replaced. I cleaned the motor, rebuilt the heads... Somehow I have oil coming from the flywheel cover. I would assume it's the main oil seal, but the flywheel is perfectly dry and the bolt going into the main is dry also. There is some oil under the flywheel which of course is where the oil is dripping from. It could be from before I did the work, but it seems not. One question...are there oil plugs in the back of the motor?? any other ideas??
Cargo Master
Joined: Apr 2001
Posts: 2,697
Likes: 46
From: Vancouver
I had the same symptoms on a new 352. I pulled the tranny, etc, and found the cam plug was leaking. I fixed that but the leak persisted. I pulled the pan and replaced the side seals. Fixed it. It is very unlikely the leak is coming from the rear of your engine, and frankly the rear seal job is easier.
Eric
Eric
Fleet Owner
Joined: Jan 2004
Posts: 26,007
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From: Brentwood,CA
my guess is when you did the manifold you used the cork end pieces they give you as the gasket correct? if so its the wrong method. you discard those pieces they give you and use a thick line of blue or black RTV silicone. the fe engine is known to leak oil from that spot and those cork gaskets make it worse.
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Well it's not leaking from the manifold now...I'm sure of it. I thought about that, but that part I know I did correct. I love my truck, but why does it have to hate me so much! Love should be a 2-way street, shouldn't it??
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Michael S. Palmer
Cargo Master
Joined: Apr 2001
Posts: 2,697
Likes: 46
From: Vancouver
I know Jon. I couldn't believe it either. The side seals were weeping only very slightly, but it lost a lot of oil - about a cup on initial fire-up - and none of it was on the flywheel. The engine plate keeps it on the engine side.
Eric
Eric
Fleet Owner
Joined: Jun 1999
Posts: 24,552
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From: Creedmoor, North Carolina
Jon, I have been where you are, those darn things can move enough when installing that the seal can be broken. Spray the area good with brake or carb cleaner and remove any grease. Then drive it for a bit. Use a paper towel to wipe the clean block to see if there is fresh oil on it.
John
John
Senior User
Joined: Sep 2004
Posts: 446
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From: Texas
Mine drove me nuts for a few months with a leak like this. fast oil leaks tend to run straight down, but slow leaks can flow along edges and ridges, and drop from strange places. My leak was from the rear of the valve cover, were the intake and head meet. the gasket was sticking up just enough to let warm oil flow out. cold, nothing would leak. the oil was then trickling down the seam of the head/intake inside the gap were I couldn't see it, and then down the back of the block to the bell housing. between the bellhousing and the block plate, then down the inside to drip out the hole in the bottom of the bell housing.
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Well, as luck would have it...My truck and I are not seeing eye to eye. I wanted to drive the truck and see if i fixed the problems and the water pump gives out!! At least they are cheap and easy to do!