Thanks Paul and everyone else who responded to my questions !!!
I've been running Amsoil 20-w50 plus a PTFE additive. Found that the
PTFE (Teflon in suspension) really helps with older gearboxes. Gear selector
is tight - no slop. I think the noise is coming from inside the box - gears
and/or bearings. I was just wondering if gear oil would cause the box to make
less noise. If no one knows, I'll try it and report the results.
I packed the ends of the carb throttle shafts with grease and the too
fast idle problem disappeared. I guess I need either new carbs or shafts and
bushings. I will probably junk the HIFs and install HS4s. The thing about the
SUs I like the most is their simplicity and the HS series work fine and are the
most basic. Unless someone can tell me why the HIFs are better (a lot of
people have told me to keep the HIFs, but no one has provided a good reason), I
plan to switch to HS-4s. Anyone - why are HIF4s better than HS4s (not
including emissions) ?????
Skip '74 B
-----Original Message-----
From: Paul Hunt [mailto:paul.hunt1@blueyonder.co.uk]
Sent: Thursday, April 08, 2004 10:45
To: Christian, Skip; MG Digest (E-mail)
Subject: Re: Carb & Trans Oil Questions
Should be engine oil, typically 20W/50, in the gearbox with or without
overdrive. Rattling can be due to a worn or lost plastic bush at the bottom
of the gear lever, this also causes the lever to waggle about when in gear.
Normally there should be no free play in the gear lever in any gear.
If the shafts can be waggled up and down or from side to side they are worn,
but it may not be affecting running. If spraying carb cleaner or putting
thick oil on the ends of the spindle changes the idle speed momentarily then
the wear *is* affecting running.
PaulH.
----- Original Message -----
From: "Christian, Skip" <wellner.christian@navy.mil>
To: "MG Digest (E-mail)" <mgs@autox.team.net>
Sent: Wednesday, April 07, 2004 5:43 PM
Subject: Carb & Trans Oil Questions
> 1) What is the best oil type (Gear or Motor oil) and additive to put in
MGB
> non-overdrive transmission to quiet noise ???
> 2) Is it possible to tell if just replacing carb throttle shafts will fix
a
> carb throttle shaft vacuum leak without buying the new shafts ??
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