Andrew Sexton wrote:
>
> Hi all ... "Long time listener, First time caller" (sorry couldn't
> resist.)
>
> I've been a proud driver of a '74B-GT for 12 years.
> I now have an unusual oil leak and I was wondering if anyone else has
> had this problem and maybe has a remedy.
>
> When I drive the vehicle it sprays oil out of the dip-stick tube. I can
> drive a 1/4 mile, park the car and end up with a spot on the drive that
> is about 4 inches in diameter.
> If I take the dip-stick out of the tube while the engine is running, oil
> spits out the tube.
> I have tried placing an 'O-ring' on the dip-stick in an attempt to
> create a seal, but to no avail.
> I drove to Victoria British today and bought an old style 'dust cap'
> that fits on the dip-stick and covers the oil tube, but to no avail. It
> still leaks.
> Has anyone encountered this issue?
>
> The problem started after I had some work done to the vehicle:
> rebuild of the head
> new main seal
> new oil pan seal
> After this work was done, I had many leaks; the one described above,
> head gasket, valve cover, and water outlet elbow.
> (if anyone is in the area of Knoxville, TN, I can tell you where not to
> take your vehicle!!..It's a long story and involves much more than
> leaks)
> I have fixed all of the leaks except for the one from the dip-stick
> tube.
>
> Hopefully someone has an idea.
The engine is producing positive pressure and is not "breathing." The most
common source of positive crankcase pressure is blow-by past the piston
rings; I suppose it's possible it might be coming from the valve seals and
guides somehow, since you mention the head-work. I'm not as knowledgeable
about MGB's as I am with Minis and older MG's; Does your engine have a PCV
valve? If so, it's probably blocked. When I souped-up the Cooper S, I found
it necessary to add extra breathing capability by welding tubing to the
second tappet cover and the rocker cover, then running flexible tubing from
these to a tomato can which catches any oil-drips.
In the long run, sealing the engine is not the answer; you need to find out
where the pressure is coming from and then eliminate or ameliorate the
problem.
-Rock http://www.rocky-frisco.com
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