View Full Version : Question about possible oil pressure problem????

04-08-2012, 07:09 AM
I recently restored a 72 TR6 that has triple Webers. Now there seems to be oil being forced from the pin hole in the valve cover cap. I've looked and looked and can find no other place it could be coming from. Oil pressure is extremely high, according to the gauge, at 50 lbs idling and up to 75 lbs as you accelerate.
What could be causing this? Could it be the weight oil? What is recommended? Could something be stopped up inside the engine? It concerns me and I'd like the leak fixed.
Any thoughts or suggestions?

04-08-2012, 07:50 AM
That oil pressure is fine, nothing to worry about.

I don't believe there should be a pin hole in the 72 cap, but the real problem is too much crankcase pressure. What did you do about the original crankcase vent to the carbs?

04-08-2012, 11:59 AM
The Webers were already on the car when I bought it. Where exactly is the vent?
As for the pinhole, I replaced the original valve cover with a polished one....fist thing I checked was to make sure the gasket was not leaking.
Maybe I should carry to another shop to have it checked?

04-08-2012, 03:35 PM
The valve cover has a nipple sticking out on the same side as the carbs. As originally designed the crankcase pressure was relieved by attaching a hose from that nipple to nipples on the ZS carbs that provided a slight vacuum.
Slight though it was it was enough to keep the crankcase pressure from blowing out oil or excessive oil vapors.
What provision has been made to accomodate the relief of crankcase pressure since the Weber conversion ? In other words, what is the valve cover nipple connected to ?

04-09-2012, 12:28 PM
Mine is a 71 and the valve cover has about a 3/8 inch pipe nipple coming off the valve cover and a hose that just vents down the side of the engine, if you have no vent nipple is building up pressure