MonteCarloSS.com
MonteCarloSS.com

CELEBRATING 20 YEARS!

Previous Thread
Next Thread
Print Thread
#981413 - 08/26/13 07:03 PM Major oil leak  
Joined: Feb 2013
Posts: 34
Dgriffin29 Offline
Member
Dgriffin29  Offline
Member

Joined: Feb 2013
Posts: 34
Concord,NC
For some reason when I add oil through the driver side valve cover, most of all of the oil that I add runs out below the exhaust manifold. I have changed the valve cover gaskets 2 times now and this hasn't fixed it. When ever it runs out, it comes out and drips down the motor mount on the driver side. It is only leaking on the driver side, the passenger side is fine. Its a 1984 Monte Carlo SS with the stock 305 still in it.Please help!

#981441 - 08/26/13 10:24 PM Re: Major oil leak [Re: Dgriffin29]  
Joined: Oct 2007
Posts: 1,170
pazzo1969 Offline
Member
pazzo1969  Offline
Member

Joined: Oct 2007
Posts: 1,170
Mableton, GA
I would pull the cover off and check that the oil return passages are not gunked up keeping to much oil up top.


President Wicked Rides/Wicked Montes Georgia chapter
#981448 - 08/26/13 11:41 PM Re: Major oil leak [Re: Dgriffin29]  
Joined: Jul 2005
Posts: 2,671
gmachinz Offline
10+ Year
gmachinz  Offline
10+ Year
Member

Joined: Jul 2005
Posts: 2,671
Des Moines, Iowa
Sounds to me as if your vc siderail is warped....it must be perfectly flat to seal properly. And, I would suggest using longer load bars to distribute the clamping.


gbodyparts1234@yahoo.com

HARNESSWORX
#981450 - 08/26/13 11:57 PM Re: Major oil leak [Re: Dgriffin29]  
Joined: Sep 2011
Posts: 1,542
LXXXIV SS Offline
Member
LXXXIV SS  Offline
Member

Joined: Sep 2011
Posts: 1,542
Lower Peninsula, Michigan
I agree with gmachinz, especially since you said you've already changed gaskets twice already.

Many times, guys find the valve cover leaking and start tightening down on the screws in an effort to seal the leak. They don't realize that this only makes matters worse because it warps the cover. Then when that doesn't stop the leak, they apply even more torque, making matters even worse. The more you tighten, the more it leaks. Take the cover off, clean it up real good, then lay it on something really flat, like a piece of glass. Make sure it's dead straight.

#981451 - 08/26/13 11:58 PM Re: Major oil leak [Re: Dgriffin29]  
Joined: Nov 2003
Posts: 3,439
cj84ss Offline
10+ Year
cj84ss  Offline
10+ Year
Member

Joined: Nov 2003
Posts: 3,439
Jacksonville, Fl.
X2 on the bent valve cover. Also with mine the stock exhaust manifolds would cook the gaskets. I used a can of "the right stuff" and it fixed the leak. Follow the directions on the can. Fixed the issue I had and dealt with the same thing as you but mine was both sides.


[Linked Image]
1984 SS, w/87 Grand National 2004R, 355 vortec, CCC, Crane XE262.
1969 Road Runner
2003 GMC Serria
#981463 - 08/27/13 01:27 AM Re: Major oil leak [Re: Dgriffin29]  
Joined: Feb 2013
Posts: 34
Dgriffin29 Offline
Member
Dgriffin29  Offline
Member

Joined: Feb 2013
Posts: 34
Concord,NC
So if I take it off and the valve cover is bent should I replace it or should I add some of the longer load bars, and some put some of "the right stuff" on it??

#981469 - 08/27/13 01:55 AM Re: Major oil leak [Re: Dgriffin29]  
Joined: Jul 2002
Posts: 934
32v_dohc Offline
10+ Year
32v_dohc  Offline
10+ Year
Member

Joined: Jul 2002
Posts: 934
my garage
Just flatten the cover to be flat using a straight edge as a guide. Also check the drain back holes. The valve cover rail is tall enough tht properly draining heads won't just gush out.

#981470 - 08/27/13 02:03 AM Re: Major oil leak [Re: Dgriffin29]  
Joined: Jul 2005
Posts: 2,671
gmachinz Offline
10+ Year
gmachinz  Offline
10+ Year
Member

Joined: Jul 2005
Posts: 2,671
Des Moines, Iowa
Number one is to make certain the side rails are flat...use a deadblow to knock them flat on a piece of 2x4 then clean with brakleen and once dry, use a thin bead of RTV Ultra Black between the bc and gasket, then lightly bolt them back down on your heads.

If the vc's are chrome, do the above but once clean, use a wirebrush on a wheel to remove the chrome finish off the gasket surface....chrome does not seal well where heat is concerned. The RTV will conform to irregularities on the valve cover and the cork by itself will seal well against the head. Oh yeah...and stay away from the rubber ones...use only cork/rubber such as Fel-Pro VS12869AC - those are thicker for a better seal.


gbodyparts1234@yahoo.com

HARNESSWORX
#981471 - 08/27/13 02:07 AM Re: Major oil leak [Re: Dgriffin29]  
Joined: Aug 2000
Posts: 3,355
Phil87SS Offline
Moderator
15+ Year
Phil87SS  Offline
Moderator
15+ Year

Member

Joined: Aug 2000
Posts: 3,355
Gilbert, Arizona
I think the guys have hit it on the nose with the warped cover,I don't think 'drain back holes are plugged as a valve cover should seal with oil pooled right against it.
I like to use silicon gaskets (not cork) and glue them to the cover with high temp RTV, when still tacky set them on the gasket side so the weight of the cover will keep the gasket flat while the RTV sets up. When re-installing it use a little motor oil on the exposed gasket and you should be good to go. If you can afford it, springing for some cast aluminum valve covers, they won't warp, this leaking has been a problem with small block chevies since 1955, that is why they FINALLY went to center bolts in the 1987 to seal them up!


1987 Monte Carlo SS, '78 406, Speed Density TPI, Herbert Hyd Roller Cam, Trick-Flow "Twisted Wedge" 1st gen alum. heads, 11.0:1 compression, Sealed-Power pistons w/gapless rings, Mallory CD ignition, 30 lb Accel injectors, Edelbrock headers, Bosch external fuel pump, 36 lb Centerforce flywheel, 1993 T-56 6-speed,Hurst shifter and stock 3:73 Posi.

Random Images
989/thumbs/my_monte_46.jpg
by 85montanezcarloss
500/thumbs/monte_116.jpg
by GearHeadDrew
500/thumbs/Cruise_night.jpg
by NYmonteSS
500/thumbs/BroncoMonte_resized_177x113_v4.jpg
by 84 ZZ4
664/thumbs/MC_SS_smaill_08.jpg
by Hou Tex MC SS
Help MonteCarloSS.com


Recent Contributors
finallySS
Authorized Vendors
Tell them you saw it
on MonteCarloSS.com!


CustomMonteSSParts.com
Dixie Monte Carlo Depot
GSI Interiors
HRpartsNstuff
Mikes Montes
Savitske Classic & Custom
Powered by UBB.threads™ PHP Forum Software 7.6.0