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Discussion Starter · #1 ·
I have a 1986 E350 RV with a 460 that I took on a 5500-mile trip out west from my home in Pennsylvania this spring. The issue is oil consumption, used about a quart every 400 miles. Last fall the cylinder heads were rebuilt with new guides and harden exhaust seats, so the issue of guides or valve seals are most likely not an issue. It used oil before the cylinder head rebuild and I probably should have done a complete rebuild at the time, but the cylinder walls looked good. I never see it smoke, not on startup, not on long downhill or full throttle up hill. It does not have a catalytic converter and does not leak oil. The engine has 70,000 miles on it and there is no blow by. In fact, the foam crankcase filter in the air cleaner housing is dry and shows hardly any signs of crankcase vapor. All spark plugs are similar in color and no signs of any one cylinder being the issue. It seems the oil is thoroughly mixed in the fuel air mixture before combustion. I am wondering if anybody ever had a similar issue and found the crankcase ventilation system being the issue? Just want to make sure I have checked everything before an engine rebuild.
On side note I installed a performer manifold and used the Edelbrock intake manifold gasket which blocks off the heat transfer under the manifold. On the travel this spring I had several 28 – 30-degree mornings and I had no issues on startup. I have headers installed so no warm air ducted into the air cleaner inlet.
 

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So you added 14 quarts of oil over the span of you’re trip? A quart ever 400 miles is no bueno!
The first thing I would do is a leak down test, see if that points to rings or if it’s the top end.
 

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Discussion Starter · #4 ·
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At that rate, you don't even need to change the oil. Just spin a new filter on every 3 months.
I still change the engine oil, but your suggestions does have merit. The above picture is of the crankcase breather that was installed for 7,000 miles. from the picture you can see there is very little blowby. I
The chuckle is if you figure % oil consumed compared to fuel consumed while over the limit it does seem to have the effect of a quart every 400 miles.
Despite the oil consumption the engine runs well, in addition to the performer manifold the distributor was recurved by Scotty, timing chain gears changed for straight up timing and headers.
I will look into doing a leak down test.
 

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Intake manifold gaskets can suck oil when they are not sealed with RTV.
Disconnect PCV, plug valve and check for vacuum at valve covers.

PC seals on the heads or umbrella?

Glazed cylinders will allow oil consumption and still check good on cranking psi.

I'd do a leakdown.

This wouldn't be the first time a fresh set of heads let oil by the guides...







Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
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See our products in the Vendor for sale section
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It was mostly satire. However, Scotty is right. Glazed walls is a probable culprit, although shocking the plugs aren't telling the tale at that rate of loss. I'll bet a leak down hisses out of the crankcase.

A bore scope with a mirror attachment would show you if the valves are at fault, they'd be dripping at a quart in 400 miles.

Then again, pulling the intake to inspect the gaskets would show you not only the gaskets, but the back of the intake valves as well.
 

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Discussion Starter · #7 ·
It was mostly satire. However, Scotty is right. Glazed walls is a probable culprit, although shocking the plugs aren't telling the tale at that rate of loss. I'll bet a leak down hisses out of the crankcase.

A bore scope with a mirror attachment would show you if the valves are at fault, they'd be dripping at a quart in 400 miles.

Then again, pulling the intake to inspect the gaskets would show you not only the gaskets, but the back of the intake valves as well.
Thank you for the replies. Satire is funny and I did enjoy the comment of just changing the filter. I was really conflicted when selecting the intake manifold gasket for the Performer manifold to the point I bought several to compare and ended up using the Edelbrock labeled intake gaskets. At the time I installed the manifold I did not know the Scotty method of using sealant and the 2-step process. The Edlebrock gaskets have embedded rubber rings around each intake port, so I only used sealant on the water port.
Scotty: When you apply sealant to the head side of the intake gasket and set the manifold overnight do you torque the manifold bolts are just snug? I will try your method of checking for vacuum with the PCV valve removed. Thank you for that information.
I will also perform a leak down test. If it is not the manifold, I am pretty sure I am looking at pulling the motor for a rebuild.
Thanks
 

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Discussion Starter · #8 ·
Below is a picture of 2 of the sparkplugs with 7000 miles. Typical of what all the plugs look like.
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You can see deposits, but I expected to see more of what I consider oily deposits on the plugs for the amount of oil consumed. On the above text I did not mention the valve stem seals are OEM style.
 

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Hi are you sure you don't have a valve cover leak?? the outside of those plugs look awful oily to me???? there way to shiny for 7,000 miles on them and should be dry around the out side those look like they were wiped dry but are still oily.. how about a picture of your motor??

good luck take care be safe
tim
 

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Discussion Starter · #10 ·
Tim, The plugs in the picture are AC pl
Hi are you sure you don't have a valve cover leak?? the outside of those plugs look awful oily to me???? there way to shiny for 7,000 miles on them and should be dry around the out side those look like they were wiped dry but are still oily.. how about a picture of your motor??

good luck take care be safe
tim
The plugs in the picture are AC plugs, the color of the base is black.
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HI Thanks for the pictures .. it does look very clean.... It don't matter what type of plugs are in the picture in post #8 I was just saying they look very shiny on the outside like they may have been wiped with an oily rag or there is oil on them .. especially the one on the left When you enlarge the picture, there's a lot of junk in the threads and it looks wet.. There is a lot of black junk inside the plug as well.. you really won't really see smoke when you are driving it because of air turbulence at the side and back. If the pcv system is working properly you won't see a lot of crap in that filter as that is the air IN for the PCV system.
I think once you do the leak down your going to find bad/weak rings..

good luck take care be safe
tim
 

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Anyone else having Forest Whitaker eye looking at those plugs?
HI .. if you RT click on the image then click "open image in new tab" click on the new tab.
Hold CTL button and use the roller on your mouse and you can enlarge the picture to see a Piss-ant Pee..

good luck take care be safe
tim
 

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Discussion Starter · #15 ·
I am using the stock 4180 carburetor, so the mixture is probably lean. There is no detonation, there is a 180 degree thermostat and per heat gun the temperature it runs in that range. Temperature will climb on long uphill but not even close to high. Having said that the combustion temperature could be high. Thank you for the observation.
 

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It appears that the plug is too hot or it is lean. Look at your ground strap. It looks like aluminum on the tip and on the white insulator portion.

I also see oil contamination on the body below the threads and the ground strap.

I'd do a leak down.

Oil contamination of the chamber lowers effective fuel octane. A lean OEM carb + oil can be deadly.







Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
Customized crate engines
ParklandAutoMachine.com
R-H-P.biz
"Parkland Performance Auto Machine" Formerly RHP
(253)-988-6648
Parkland Auto Machine
 

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Discussion Starter · #18 ·
It appears that the plug is too hot or it is lean. Look at your ground strap. It looks like aluminum on the tip and on the white insulator portion.

I also see oil contamination on the body below the threads and the ground strap.

I'd do a leak down.

Oil contamination of the chamber lowers effective fuel octane. A lean OEM carb + oil can be deadly.







Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
Customized crate engines
ParklandAutoMachine.com
R-H-P.biz
"Parkland Performance Auto Machine" Formerly RHP
(253)-988-6648
Parkland Auto Machine
I have a leak down tester coming / will perform it.
Is there a method to tell if the deposits on the plugs are aluminum?
 
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