After I rebuilt my engine a few years back, I found that I had oil weeping from
the filler cap on my alloy valve cover (black, 'triumphtune' logo - I think
from moss, but it's starting to be a long time ago...) I tried everything I
could think of with the crankcase breather setup (it's a '69, so it's pretty
basic), even leaving it open to atmosphere. The fix turned out to be sealing
the tiny vent hole in the cap itself. Someone on the list suggested it and I
thought 'yeah, sure', but as I had tried everything else I could think of - why
not? I cleaned it really well, then used a high-wattage soldering iron to
close it up with just a dab of solder, figuring it would be easy to reverse if
I wanted to, and it wasn't likely to drop any bits into the engine. Short
story is that it hasn't weeped since, nor did the seepage migrate to somewhere
else. Weird. Of course, now it has been long enough (about 4 years) that the
cover gasket needs to be replaced as it is seeping at th!
e back (wasn't someone going to make neoprene gaskets for this?).
Give it a try - what's to lose?
Oh, regarding the external feed - I'm one of those who had excessive smoking
with it installed (fresh rebuild, no valve stem seals). I was getting cranky
with my machinist (who is really quite good) and he suggested that there was
too much oil up there with the external feed. He was right. Of course, if I
were running high $ roller rockers, I'd for sure be using the external feed and
addressing the problem with stem seals.
-------- Original Message --------
> Date: Tue, 12 Sep 2006 04:51:00 -0700 (PDT)
> From: michael lunsford <firstname.lastname@example.org>
> Subject: External oil feed
> If you have an aftermarket valve cover it is likely that it does not have an
>internal baffle as does the stock valve cover. If you have no baffle the
>vacum from the carbs get an extra opportunity to suck the extra oil from the
>external oiler into the carbs and past them to the charcoal canister. In
>addition to fabricating a baffle for my aftermarket valve cover I reduced the
>size of the oil line with the head of a pop rivet. I have Richard Good's
>roller rockers with which he recommends using the external oiler so have not
>switched back to the original oiling method. I may eventually have to do this
>since even after fabricating a baffle and reducing the oil passage size I have
>been unable to competely stop oil from coming out around the cap on the valve
>cover. Some people have suggested blowby from the pistons on my obviously
>wounded engine so I'm hoping the new "fresh" engine will take care of the
> In regard to the new engine I finally got the pistons installed and am
>awaiting the arrival of a new timing chain and gears and a new oil pump. All
>it takes is cubic $$$$$.
> Mike Lunsford, 1970 TR 6 EFI
> Get on board. You're invited to try the new Yahoo! Mail.