A good seal is needed on a sealed or semi-sealed crankcase ventilation
system or you may get a weak mixture - witness removing the oil filler cap
on these systems.
Try removing your cap at idle and see it it makes any difference to engine
revs. If it doesn't then, for whatever reason, any leaks from around the
dipstick are making no difference and you probably have problems elsewhere
in your crankcase and emissions plumbing.
If the cap makes a difference put it back and try pulling the stick in and
out, and sealing the hole with your thumb. If you get the same change in
revs with thumb on and off, if any difference at all, as with dipstick in
and out then the dipstick seal is probably good enough.
Just my rule of thumb.
PaulH.
----- Original Message -----
From: Keith Gernert <kgernert@triad.rr.com>
To: <mgs@autox.team.net>
Sent: Friday, August 11, 2000 3:04 AM
Subject: Oil dipstick seal
> I think I read somewhere that a good seal around the oil dipstick is
essential to
> maintain good vacuum in the engine. (I think I got that right--this is
well outside
> my area of experience or knowledge.) The dipstick on my 79 B is pretty
sloppy, and
> I'm sure it's not sealing well at all.
>
> Is there any trick I can use to reestablish a good seal around the top of
the dipstick
> tube, or should I just buy a replacement dipstick?
>
>
>
> --
> Keith Gernert
> 79 MGB
> --
>
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