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08-17-2015 | #11 |
Join Date: Jun 2013
Location: Toronto
Posts: 782
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Re: Oil leaked on me twice on the valve cover passenger side near oil fill cap. PIC>
Ok so I tried pulling the o ring and no flex at all.. Cracked and sure enough it's almost rock hard. I'll head to the local auto specialty store tomorrow to see if they have an o ring similar to this one. When I screw the cap on without the o ring it jiggles the same way with it on.
Here's a closer pic of where the vent tube goes into the cover .. Pretty oil free to me ? |
08-17-2015 | #12 | |
Join Date: Aug 2009
Location: South Dakota/California
Posts: 3,791
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Re: Oil leaked on me twice on the valve cover passenger side near oil fill cap. PIC>
There are several of us that have the stock Oil Caps sitting on the shelf or somewhere that have been replaced by the Billet Aluminum Oil Cap. I can check my shelf to see where the stock Oil Caps are sitting as you like (90' and 91' Oil Caps)
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Piston Blow by is causing pressurization of the crankcase and the Cam Covers are vented to reduce condensation through the Air Horn which is normal. A clogged PCV system could cause Oil leaks in lots of places including the Oil Pan and Cam Covers and the Cam Cover Vent as you describe. His Oil Catch Can could even be clogged up reducing the Positive Crankcase Ventilation through the Plenum Vacuum. Or....maybe oil was spilled during the topping off of Engine Oil We shall see and a different Oil Cap might work and it might not work but removing the Cam Covers with engine in car is NOT fun. But the saving grace with this LT5 is that the Cam Covers have already been removed once with NEW SS Allen Head Cam Cover Bolts which would make it pretty easy to remove Cam Covers with Engine In Car to replace the Cam Cover Vent Filters. Marc Haibeck Cam Cover Vent Filters Jerry's Cam Cover Vent Filters For others watching....Jerry has the SS Allen Head Cam Cover Bolts as well as other SS Allen Head Bolts for other LT5 components. Jerry also has New and Used Oil Fill Caps of which the 90'-92' are different than the 93'-95'.
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Left Clickable links -Solutions- LT5 Modifications/Rebuild Tricks Low Mileage ZR-1 Restoration 1990 Corvette (L98) Modifications LT5 Eliminated Systems LT5 Added Systems LT5/ZR-1 Fluids 1995 LT5 SPECIFIC TOP END REBUILD TRICKS Last edited by Dynomite; 08-17-2015 at 08:47 AM. |
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08-17-2015 | #13 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,696
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Re: Oil leaked on me twice on the valve cover passenger side near oil fill cap. PIC>
In one of the times I did an upgrade on my motor, I used ScotchBrite as a filtering material for the cam cover vent tubes. Shortly after I began smelling oil burn whenever I went WOT. Also had a small oil leak that seemed to be coming from front right hand corner of motor. Had oil pooling on cam cover in very much same manner that you see in the pics above. I was able to remove the passenger side cam cover and replace only the ScotchBrite material in that cover and that seemed to be enough to stop the leaking. Later on, I did a cam upgrade, so I replaced both sides with foam material from Marc H. I also used some black RTV on the front right hand corner oil pan stud.
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
08-17-2015 | #14 |
Join Date: Jun 2013
Location: Toronto
Posts: 782
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Re: Oil leaked on me twice on the valve cover passenger side near oil fill cap. PIC>
Catch can is pulling oil still and doesn't seem to be clogged. I am using a larger diameter hose to and from the can so shouldn't be a restriction there I think. I picked up a few o rings and will try them out. The original is hard and I'm hoping it's the reason. The vent tubes.. If oil was leaking out of them I would assume there would be even a trace of oil right at the point where the tube goes into the cover? There isn't any there at all. I pulled plug wires and happy to see they're all clean of oil so it was just the little bit that was visible.
Can anyone verify that the oil fill cap when removed is basically 2 pieces and not 1 solid piece ? Mine jiggles and the inner piece looks to be held by the cap by tabs. |
08-17-2015 | #15 |
Join Date: Apr 2004
Location: ATL. GA.
Posts: 2,168
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Re: Oil leaked on me twice on the valve cover passenger side near oil fill cap. PIC>
Yes the oil cap is two parts much like the gas cap with the top half acting like a ratchet so you can't over tighten it.
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Steve 1990 Steel Blue/Black #2355 1990 Red/Red #1473 1991 Quasar /Black #118 Sold 1991 Turquoise/Black #766 Parted Out 1993 Yellow/White #179 Sold 1990 Black/Gray #1361 Headers/4:10s Sold |
08-17-2015 | #16 |
Join Date: Aug 2006
Location: McLean, VA
Posts: 3,710
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Re: Oil leaked on me twice on the valve cover passenger side near oil fill cap. PIC>
I would also check PCV valves and make sure they are not gunked up.
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08-17-2015 | #17 |
Join Date: Jun 2013
Location: Toronto
Posts: 782
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Re: Oil leaked on me twice on the valve cover passenger side near oil fill cap. PIC>
Well I got the best fitting o ring on the cap and there is a VERY noticeable difference. When tightening I can fee the o ring get snug / some resistance and then it clicks. Never did that before. I cleaned everything up and will get on it a few times tonight after work if I get a chance and check.
Pcv valves were left in sea foam solution for a long time while I did the top end pull. They seemed to be clean but doesn't hurt to check! |
08-17-2015 | #18 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,696
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Re: Oil leaked on me twice on the valve cover passenger side near oil fill cap. PIC>
I'm hoping you find it to be the oil cap.
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
08-17-2015 | #19 |
Join Date: Jun 2013
Location: Toronto
Posts: 782
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Re: Oil leaked on me twice on the valve cover passenger side near oil fill cap. PIC>
I certainly hope so ! My dipstick doesn't stay put either . I'll be pulling it off and sending it out to lokar maybe this week for a screw in billet unit. I will be asking them to take measurements etc so others here can buy one as several people have expressed interest. I don't think I'm leaking from the dipstick though because everything in the area is dry. I have a feeling braking plus rev matching and downshifting and Loving the rumble my car makes is responsible for oil getting to the front of the cover and leaking through the cap. That's my best guess this far. |
08-17-2015 | #20 | |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,696
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Re: Oil leaked on me twice on the valve cover passenger side near oil fill cap. PIC>
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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