Hi Jerry
The problem you have is that you have increased the flow to the top of the
engine, and in doing so you have increased the pressure at the head gasket
joint where the oil way goes through. The oil will go down as well as up!
The oil flow and therefore pressure is normally regulated by the flat on the
camshaft, oil can only flow to the head when the flat connects the two bits
of the gallery, the rest of the time the cam journal acts as a blockage in
the line. By feeding a full flow of oil to the top you have increased the
pressure at the head gasket, there is a hole in the gasket with a sealed
edge for the oil to pass through, this is often the first place to show
signs of leakage without the extra pressure! Net result is you need a new
head gasket as the chances are that it will continue to leak even if you
undo the conversion as there is now a path out for the oil.
Graham.
----- Original Message -----
From: "Jerry Greenberg"
Subject: Strange Oil Leak
> I've been a lurker on this list for a long time and appreciate the
> knowledge and wisdom imparted, but now I have an oil leak problem that
> I think I've figured out but don't understand.
>
> I replaced the rockers on my 1976 TR6 (with a 1969 engine) and also
> installed an oil line to the head. Since then, I've noticed an oil
> leak around the head gasket, on the left (driver's) side of the engine
> but primarily in the rear of the engine. This could possibly be
> because the wind under thehood when driving is blowing the oil to the
> rear of the engine.
>
> It's not the valve cover gasket and it's not the oil line to the head
> that is leaking as the leak is below those points. Most of the leak
> appears to be at the rear of the engine, again from around the head
> gasket, then drips (flows)to the transmission and then to the floor.
> I've noticed more oil on the floor than is normal for my car since I
> installed the oil line
>
> The engine is not any less powerful than pre-rocker and oil line, runs
> smoothly and very cool so I'm ruling out a blown head gasket. I've
> experienced those before in other cars so I know the symptoms.
> Everything on the head is tight, and there is no water and oil in the
> sump.
>
> The more I've thought about it, the more I think the problem surfaced
> when I installed the oil line.
>
> Tomorrow I'm going to remove the oil line and replace the plug and see
> if that helps, which I suspect will elimiinate the leak.
>
> But, does anyone know why oil might be leaking from between the head
> and the block, or has anyone else experienced this? Are there major
> problems now, or any ahead?
>
> Thanks for the help.
>
> Jerry Greenberg
> 1976 TR6
> Houston
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