[Mgs] T-series work

[Richard Lindsay]

Hello friends,
   The generator came off, got cleaned and lubricated, went back on with a
loose drive belt, and is now working properly...and quietly.
   A short drive verified the claims in the previous sentence. Thank you
Bob, *et al*., for your ongoing sage advice.

Rick

On Sun, May 3, 2020, 9:21 AM Richard Lindsay <richardolindsay at gmail.com>
wrote:

>    Thank you Bob. Great to know on all fronts. Regarding valves,
> generators and pumps,
>    A bit more valve clearance is typical of racing cams. Doing so is a
> little noisy but despite a few mils less valve lift and an all but
> unmeasurable timing delay, the valves 'snap' open faster. Cam wear can may
> be accelerated. All of the above is a bit more applicable to direct action
> overhead cam designs. But you know this.
>    Bob's sage advice has encouraged me to un-mount the generator for a
> rebuild. I knew about the looser drive belt tension since that advice is
> true even for later model cars with alternators. Lateral stress on the
> bushings is minimized. And you know that too.
>    I replaced the waterpump when I rebuilt the engine a few years ago.
>
> Thanks again Bob,
>
> Rick
>
> On Sun, May 3, 2020, 8:00 AM Robert's New iPad <mgbobh at gmail.com> wrote:
>
>> Hi Rick,
>>   The dreaded dynamo sound is heard again. It is good that you heard it
>> before damage was done to armature or field coils.
>>    Thoughts that others have shared about the dynamo:
>>    Fan belt should be as loose as it can be w/o flipping off. Another
>> measure of tension is to turn on all electrics, then spray water on the
>> belt. Make it just tight enough to grip, not slip, which is about as loose
>> as first thought.   Segmented belts grip better than the original wide
>> belt-don’t look right but are easier on the dynamo.
>>    Owner’s manual said to use grease in the brass fitting.  Others say
>> that oil, used frequently to wet the felt, is better.  Most agree that
>> original bushing was an Oillite or equivalent. Many of the replacement
>> bushings are not. Many believe that reaming an Oillite bushing reduces its
>> ability to put oil where it’s needed.  Some will drill a tiny hole right
>> through the bushing, hoping that oil will get to the moving armature more
>> easily.
>>    Do you know the clearances for valve rockers?  .019 and .012 were MG
>> specs for original camshafts.  Other clearances were specified for other
>> cams. It is not helpful to tell you that I got a Crane camshaft that made
>> so much noise with its specified clearances that called Crane.  An engineer
>> told me that those clearances were for racing; that for normal use to
>> reduce by three or four thou.  I did, and the fear factor in small children
>> and neighborhood dogs was considerably reduced.  In one of his videos, John
>> Twist said to use .015 for everything, unless one had specific knowledge.
>>    Happy motoring!
>> Bob
>>
>> > On May 3, 2020, at 8:35 AM, Richard Lindsay via Mgs <mgs at autox.team.net>
>> wrote:
>> >
>> > Hello again friends,
>> >    I have decided to do a bit more maintenance work on my MG TD before
>> driving it much. The reason for this decision is because of two sounds.
>> There is a 'shhhhh' kind of sound coming from either the water pump or the
>> generator. It's the sound a dry bushing or bearing makes before the
>> squealing begins...maybe. The second sound is more typical. Valve lash
>> chatter.
>> >    The second noise is an indication of needed routine maintenance. The
>> former hints at a needed repair. Both issues will be addressed...if after
>> the 308GTB work and before the 1800E arrives.
>> >
>> > Rick
>>
>
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