[TR] 1)Engine Block Interior, Liner Paint &2)Venting

[Rick Patton]

My stock oil filler cap did not have a vent hole. 1975 TR6.

If you look at the underside of that shiny chrome cap (if its like the 
one that came with my  aluminum valve cover), you'll notice that the pin 
hole in the top side is above the workings that actually seal the cap. 
That little hole is merely a decoration. There is no path from the 
inside of the cap to that hole. What little breathing is done under that 
shiny cover just escapes all around. There is no baffling so any oil 
thrown against the cap will bleed to the outside. My chrome cap always 
created a wet spot or even a small puddle around the cap on top of the 
valve cover. The crankcase venting works on my car so I soldered up the 
actual vent hole on the bottom of the cap. After all how much could vent 
thru that tiny hole as compared to the 1/2" vent hose a few inches away 
on the side of  the valve cover? 

Rick Patton
75TR6sci
http://pattonmachine.com/             

DLylis at aol.com wrote:
> In a message dated 11/21/2008 4:22:54 P.M. Eastern Standard Time,
> adcronin at ameritech.net writes:
>
> Another
> question relates to the alloy rocker cover with its tiny pin hole air vent
> in
> the supplied filler cap.  Is this adequate to  properly function the way the
> stock filler cap  did?
>
> snip