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#1 |
Registered User
Join Date: Oct 2011
Location: Emory TX
Posts: 900
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Re: Foul plugs and oil leak I cant trace
Like has been said sevral times check the intake. If it's not sealed good on the bottom it will suck quite a bit of oil into the cylinders. Then after it sits the oil will start seeping around the threads. Pull the intake and look in the ports if it's leaking there will be oil in the ports. Leaking vacuum will also cause it to run rough.
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___________________ 78 ccsb dually 5.3 4l60e http://67-72chevytrucks.com/vboard/s...d.php?t=491551 |
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#2 | |
Registered User
Join Date: Aug 2010
Location: Netherlands, The Hague
Posts: 1,518
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Re: Foul plugs and oil leak I cant trace
Quote:
I got another question. how can I check if the fluid on the outside of my engine is oil or coolant? since there isnt any oil in the heads on the outside, where the engine is wet...
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My dreamride / project:1977 GMC C15 Suburban In storage: Monster - 1974 GMC Suburban 25hundred Sold : Chevrolet Suburban K20 Silverado 1986 Guide: real HID projectors for 4x6 headlights link: DIY LED TAILLIGHTS |
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#3 |
Registered User
Join Date: Oct 2011
Location: Emory TX
Posts: 900
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Re: Foul plugs and oil leak I cant trace
Looks to me like it's seaping from the valve covers at the rear corners. What type of gaskets did they use on the valve covers? Cork? It's best to get some felpro rubber gaskets and make sure the sealing rails on the valve covers are flat and true.
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___________________ 78 ccsb dually 5.3 4l60e http://67-72chevytrucks.com/vboard/s...d.php?t=491551 |
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#4 |
Registered User
Join Date: Oct 2011
Location: hudson,wi
Posts: 805
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Re: Foul plugs and oil leak I cant trace
Again, check the valve covers. You haven't said you tightened them or checked the gaskets.
riz |
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#5 |
Registered User
Join Date: Aug 2010
Location: Netherlands, The Hague
Posts: 1,518
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Re: Foul plugs and oil leak I cant trace
tested a hotter plug for two days...was hoping it would fix the fouling.
here's the result after two day ![]()
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My dreamride / project:1977 GMC C15 Suburban In storage: Monster - 1974 GMC Suburban 25hundred Sold : Chevrolet Suburban K20 Silverado 1986 Guide: real HID projectors for 4x6 headlights link: DIY LED TAILLIGHTS |
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#6 |
Registered User
Join Date: Oct 2011
Location: Emory TX
Posts: 900
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Re: Foul plugs and oil leak I cant trace
The hotter plug might stop your fouling for a while but it's just hiding a bigger problem that still needs to be adressed.
How much oil is it using?
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___________________ 78 ccsb dually 5.3 4l60e http://67-72chevytrucks.com/vboard/s...d.php?t=491551 |
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#7 |
Registered User
Join Date: Aug 2010
Location: Netherlands, The Hague
Posts: 1,518
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Re: Foul plugs and oil leak I cant trace
I need to check on a flat service tomorrow...will check...
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My dreamride / project:1977 GMC C15 Suburban In storage: Monster - 1974 GMC Suburban 25hundred Sold : Chevrolet Suburban K20 Silverado 1986 Guide: real HID projectors for 4x6 headlights link: DIY LED TAILLIGHTS |
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#8 |
Registered User
Join Date: Dec 2008
Location: Over yonder
Posts: 259
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Re: Foul plugs and oil leak I cant trace
cylinder head porting The bottom of the stud isn't really entering into port. When porting, a person will 'break through' exposing the bottom of the(otherwise blind) threaded hole the stud is screwed into."
When porting, I didn't go any deeper than 2'' into the ports |
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#9 |
Registered User
Join Date: Oct 2011
Location: Emory TX
Posts: 900
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Re: Foul plugs and oil leak I cant trace
I thought about this also but, the heads had press in studs unless they were modified for screw in. Right?
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___________________ 78 ccsb dually 5.3 4l60e http://67-72chevytrucks.com/vboard/s...d.php?t=491551 |
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#10 |
Registered User
Join Date: Jun 2010
Location: Vermontville, Mi
Posts: 80
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Re: Foul plugs and oil leak I cant trace
Have you retorqued the intake yet?
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#11 |
Registered User
Join Date: Aug 2010
Location: Netherlands, The Hague
Posts: 1,518
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Re: Foul plugs and oil leak I cant trace
shop said it is a non-re-torqueable gasket, so they didnt want to re-torque it.
disconnected the PCV this afternoon, put a bolt in the hose and took it for a 1 mile highway drive. I was hoping the PCV was sucking in too much oil into the intake manifold, because it looks wet from oil when I take it out. brand new plug turned up like this: top bottom: again black on top, clean on the bottom and oil on the threads till the tapered end.
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My dreamride / project:1977 GMC C15 Suburban In storage: Monster - 1974 GMC Suburban 25hundred Sold : Chevrolet Suburban K20 Silverado 1986 Guide: real HID projectors for 4x6 headlights link: DIY LED TAILLIGHTS |
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#12 |
Registered User
Join Date: Oct 2011
Location: Emory TX
Posts: 900
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Re: Foul plugs and oil leak I cant trace
If they wont check the bolts it might be time for a new shop.
Just put a wrench on all of them and see if they are tight. Start in the middle and work your way out. I have seen intakes that i put on get loose many times, it's just from the gasket shrinking some with heat cycles. Does the heads have screw in rocker studs?
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#13 | |
Registered User
Join Date: Aug 2010
Location: Netherlands, The Hague
Posts: 1,518
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Re: Foul plugs and oil leak I cant trace
Quote:
I think I have a torque wrench. I'll see 2nite if I can use to retorque the heads? or intake manifold? and this is a picture of my rockers...dont know if they are screw in type? how can you see? ![]() ![]()
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My dreamride / project:1977 GMC C15 Suburban In storage: Monster - 1974 GMC Suburban 25hundred Sold : Chevrolet Suburban K20 Silverado 1986 Guide: real HID projectors for 4x6 headlights link: DIY LED TAILLIGHTS |
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#14 |
Registered User
Join Date: Oct 2009
Location: Prescott, Arizona
Posts: 2,396
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Re: Foul plugs and oil leak I cant trace
Those are press in rocker studs.
If you are certain the heads aren't the cause, and the PCV has been eliminated as a culprit, then it's probably sucking oil thorugh the valley (under the intake). Short block have alot of miles on it? And why is there a gloppy mess of oil laying on the intake under the carb? That's where an intake bolt would be. Looks like who ever installed the intake didn't put thread sealant on the threads and it's pushing oil through the bolts.....Very common mistake. That would be enough to make me want to pull the intake and check the gasket seal and clean things up. And just so you don't have to do it again, I'd check the bottom of the intake for flatness to be absolutely sure it will clamp evenly for a good seal. I've had those old cast iron intakes warped before. |
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#15 |
Registered User
Join Date: Jul 2010
Location: Lafayette, IN
Posts: 621
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Re: Foul plugs and oil leak I cant trace
I agree with rs72z, if they don't want to take 5 minutes and check the torque, go somewhere else.
I would still remove and check the intake. Maybe the gasket isn't seated properly. Or a couple of bolts aren't tight. Posted via Mobile Device |
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#16 |
Registered User
Join Date: Aug 2010
Location: Netherlands, The Hague
Posts: 1,518
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Re: Foul plugs and oil leak I cant trace
checked 2nite and used a boxed wrench.
result: the bolts with the red circle felt pretty loose and could easily be fastened a little more and are not even snug right now to my opinion. The other I couldnt move with my small boxed wrench ![]()
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My dreamride / project:1977 GMC C15 Suburban In storage: Monster - 1974 GMC Suburban 25hundred Sold : Chevrolet Suburban K20 Silverado 1986 Guide: real HID projectors for 4x6 headlights link: DIY LED TAILLIGHTS |
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#17 |
Registered User
Join Date: Oct 2011
Location: Emory TX
Posts: 900
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Re: Foul plugs and oil leak I cant trace
What plugs were getting wet?
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___________________ 78 ccsb dually 5.3 4l60e http://67-72chevytrucks.com/vboard/s...d.php?t=491551 |
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#18 |
Registered User
Join Date: Aug 2010
Location: Netherlands, The Hague
Posts: 1,518
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Re: Foul plugs and oil leak I cant trace
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My dreamride / project:1977 GMC C15 Suburban In storage: Monster - 1974 GMC Suburban 25hundred Sold : Chevrolet Suburban K20 Silverado 1986 Guide: real HID projectors for 4x6 headlights link: DIY LED TAILLIGHTS |
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#19 |
Registered User
Join Date: Oct 2011
Location: Emory TX
Posts: 900
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Re: Foul plugs and oil leak I cant trace
Hows it running with good plugs in?
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___________________ 78 ccsb dually 5.3 4l60e http://67-72chevytrucks.com/vboard/s...d.php?t=491551 |
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#20 |
Registered User
Join Date: Aug 2010
Location: Netherlands, The Hague
Posts: 1,518
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Re: Foul plugs and oil leak I cant trace
it runs super with fresh clean plugs...good response, easy idle, etc...
just gets black on top quickly
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My dreamride / project:1977 GMC C15 Suburban In storage: Monster - 1974 GMC Suburban 25hundred Sold : Chevrolet Suburban K20 Silverado 1986 Guide: real HID projectors for 4x6 headlights link: DIY LED TAILLIGHTS |
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#21 |
Registered User
Join Date: Aug 2010
Location: Netherlands, The Hague
Posts: 1,518
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Re: Foul plugs and oil leak I cant trace
somebody pointed me to a nice video. Its show how the fuel flows over the spark plug from one side...thus when taking along oil from an kinda leak from above the valve, fouling it while taking in fuel.
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My dreamride / project:1977 GMC C15 Suburban In storage: Monster - 1974 GMC Suburban 25hundred Sold : Chevrolet Suburban K20 Silverado 1986 Guide: real HID projectors for 4x6 headlights link: DIY LED TAILLIGHTS |
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#22 |
Registered User
![]() Join Date: Apr 2009
Location: New Freedom Pa.
Posts: 1,335
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Re: Foul plugs and oil leak I cant trace
Here is my best guess...
You said the Heads were "Replaced" or "Re-Done" , that term is used a lot and can mean anything. Were the valve guides re-done? and not just knurled? What valve seals were installed? If you had "Teflon" seals installed , all of the bosses on the heads must be machined. Big$$$$ This is a very expensive machine shop procedure. I have heard many shop quotes that often exceed the price of a new pair of heads and will try and discourage people from spending that much on an old pair of stock heads. Re-doing a cylinder-head the correct way is a multi-step process that gets very pricey. If you paid less than $500 , you probably got the quick y repair. Which doesn't guarantee no oil consumption. Did they machine the Heads? If so they may have taken too much material off , which can lead to sealing problems at the intake gasket area. The head can be low enough where its sucking crankcase air at the lower edge. If the heads were machined, the intake now does not match like it use too and may need to be machined at the mating surface. which can cause gasket sealing problems. You never mentioned anything about the Short Block itself, How many miles? Is it the Original engine? What did the tops of the pistons look like with the heads off? Were the clean or crusty build up on top? I ask these questions because it still could be a cracked top oil control ring which doesn't effect compression. Engine can run great with good power but still foul plugs quickly and have issues trying to push the extra un- burned oil out. Last edited by Desert1957; 07-05-2012 at 08:19 AM. |
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#23 |
Registered User
![]() Join Date: Apr 2009
Location: New Freedom Pa.
Posts: 1,335
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Re: Foul plugs and oil leak I cant trace
After looking at the pictures again, this is WAY too much oil for an intake leak. This looks like the cylinder is being overrun with oil. I thinking rings at this point. If it was a valve guide seepage problem only the side facing the intake valve would be crusty, Your plug is completely covered which means the oil is filling the whole cylinder.
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#24 | |
Registered User
Join Date: Aug 2010
Location: Netherlands, The Hague
Posts: 1,518
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Re: Foul plugs and oil leak I cant trace
Quote:
heads were completely redone, new stem valve seals teflon new bronze guides new hydraulic lifters heads were flattened (machined) dont know all other details... I didnt see the cilinders and pistons, but they told me the walls were smooth, no sign of bad rings or excessive wear, so no need to do a full engine rebuild...that is why I have a hard time right now to accept that they say its probably my rings now... I have noticed that along the intakegasket its a little wet and in some places there is a small puddle of very thick oil...I need to clean that of and see how quick it build up again... I am planning on pulling the intake off when I get back from summer holiday..southern france...600 mie drive back and forth with the suburban... I'll report back here of course
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My dreamride / project:1977 GMC C15 Suburban In storage: Monster - 1974 GMC Suburban 25hundred Sold : Chevrolet Suburban K20 Silverado 1986 Guide: real HID projectors for 4x6 headlights link: DIY LED TAILLIGHTS |
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#25 |
Registered User
Join Date: Jul 2007
Location: Tucson, AZ
Posts: 3,188
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Re: Foul plugs and oil leak I cant trace
Everything I know about engines you can put in a thimble and have a lot of room left over, but every engine I ever had with that amount of oil/crud on the plugs had bad rings.
I no longer believe in rebuilt engines. I think once you crack a factory engine open and start fiddling around with it you never get it back together as well as the factory did. All rebuilt engines I have had were not very good. The only exception is my current 83 with a Goodwrench rebuilt 454, but my experience with 454s is that they run smooth if properly tuned even if they have some slop in the engine. |
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