Smoking Valve Covers
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New User
Joined: Aug 2006
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Smoking Valve Covers
Hi all!!
I have been coming to this site for a few years now but just signed up. So be gentle. I have a 65 f100 with a 352 and it seems to have alot of smoke coming out of the oil filler cap and the vent pipe on the other side. The smoke (or vapor) looks kinda grayish brown and when I stop at a light I can see it rolling out from under the truck. It is not a big cloud but enough to notice. The moter has around 130k miles and don't think it has ever been rebuilt. Is this smoke norm. or do the heads need rebuilt.
I have been coming to this site for a few years now but just signed up. So be gentle. I have a 65 f100 with a 352 and it seems to have alot of smoke coming out of the oil filler cap and the vent pipe on the other side. The smoke (or vapor) looks kinda grayish brown and when I stop at a light I can see it rolling out from under the truck. It is not a big cloud but enough to notice. The moter has around 130k miles and don't think it has ever been rebuilt. Is this smoke norm. or do the heads need rebuilt.
Postmaster
Joined: Nov 2001
Posts: 3,351
Likes: 1
From: Escondido, CA
Before assuming it is the heads, it could be the piston rings. Do a compression check with a leak down test. This will isloate where it is leaking the most. Valve guides are a normal wear item as is the piston rings. With a 130,000 miles it seems like the motor has had a full life. With the leak down/compression check you will know better where to spend your money. You could also do a dry wet compression test if you don't have the leak down kit. All you need to do is do the compression test as normal then after you have all the readings do it again but this time add a few squirts of oil to the spark plug hole. The oil will run down to the rings and seal them more. Bumped up compression leads more to the rings. No change means you have a valve issues.
Now with all that said you don't want more then a 15% differance between cylinders. If you have a cylinder or more that are low the engine should be rebuilt.
Now with all that said you don't want more then a 15% differance between cylinders. If you have a cylinder or more that are low the engine should be rebuilt.
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here is the last compression test I did I did not squirt oil in the cylinder but with each compression stroke the reading stayed the same.
1-115, 2-105, 3-110, 4-100, 5-115, 6-118, 7-115, 8-105
I need to tune it up so I will run the compression check again with the oil trick.
Thanx for the help...
1-115, 2-105, 3-110, 4-100, 5-115, 6-118, 7-115, 8-105
I need to tune it up so I will run the compression check again with the oil trick.
Thanx for the help...
Fleet Owner
Joined: Jun 1999
Posts: 24,552
Likes: 74
From: Creedmoor, North Carolina
Prezz, Welcome to the nations truckstop 
Do you have a PCV valve in and hooked up? You want fresh air coming in the drivers side oil filler cap, out the passenger side through a PCV and into the base of the carb to burn your vapors.
Your compression reading is very good. IMHO
John
Do you have a PCV valve in and hooked up? You want fresh air coming in the drivers side oil filler cap, out the passenger side through a PCV and into the base of the carb to burn your vapors.
Your compression reading is very good. IMHO
John
Posting Guru
Joined: Nov 2004
Posts: 1,111
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From: Turlock CA
John is right on here
I have the same year truck with the same engine (65 -352) Mine has the setup as John stated the breather on the drivers side the PCV on the passenger side with the tube going to the base of the carb.
I have no smoke problem what so ever.
Give this a try and see what happens
I have the same year truck with the same engine (65 -352) Mine has the setup as John stated the breather on the drivers side the PCV on the passenger side with the tube going to the base of the carb.
I have no smoke problem what so ever.
Give this a try and see what happens
Logistics Pro
Joined: Feb 2000
Posts: 3,565
Likes: 9
From: Sun River St. George
Yeah that "vent pipe" comment is what has my curiosity piqued! Piqued now there is a word for Ford Fans! The PO had a coke bottle cap stuck in the PCV hole on my old bug when I bought it. He was using a chunk of heater hose with a big bolt stuck in it at the vacuum source on the intake. Better now with the new PCV and the 466 under it! 
Postmaster
Joined: Apr 2002
Posts: 3,613
Likes: 6
From: Coal country
He may have the old downdraft vent tube on the passenger side. I do not know when the downdrafts were outlawed, and PCVs were required, but I recently dissected a '65 352 with 352, 4 speed NP 435 camper special with a Jan '65 build date which had the downdraft tube coming out of the rear passenger valve cover.
It was original, because the carb had a spacer under it, without a tube, spigot or any other provision for a PCV connection.
It was original, because the carb had a spacer under it, without a tube, spigot or any other provision for a PCV connection.
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Post Fiend
Joined: Nov 2000
Posts: 6,060
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From: Glendale Arizona
Well what ever it is its blowby. and enought to make a cloud is time to rebuild no matter what the compression test says. Either it gets into the air or gets run through the engine. it is from the discrption excessive.
Garbz
Garbz
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New User
Joined: Aug 2006
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Thanx for the advice! It is a down tube and looks factory. I did buy the parts to convert it but have moved since and what box there in is a mystery. I don't think I have a place on the base of the carb to attach the pcv tube but there is a stamped spot on my air cleaner. I do want to rebuild but budget say's wait. and that is another forum, (the best 352 rebuild). I will get that pcv done and let you know if that works.
Thanx again for the help...
Thanx again for the help...
Logistics Pro
Joined: Feb 2000
Posts: 3,565
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From: Sun River St. George
Does the vent pipe come out of the rear of the intake manifold or out the rocker cover? The oil fill cap, is it on a tube coming from the intake or mounted on the valve cover? Looked in your gallery...nice truck!
New User
Joined: Jul 2006
Posts: 10
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Its going to need valve seals and maybe stems. I have a 292 Y Block, no breather cap on valve cover but i have a breather on my filler tube and the filler tube goes into the valley pan. Smoke like a banshee. Mesquito smoker you could say. Long story short got my heads rebuilt no smoke. Did leak down and compression test prior to and everything checked out