During the winter of 2012/13 the car has been
taken off the road for its annual maintenance schedule. This has
enabled certain other suspect items to be examined in detail,
and repaired/replaced as necessary.
Front suspension strip down at end of December revealed wear on
king pins, spring shackle bolts and spring eyes. These parts now
remade and fitted. Wear eliminated.
Whilst removing the beam axle we came across decayed timber
and a crack in front cross chassis member which is now replaced
with new ash replica made by Andrew Curtis. Matured seasoned ash
heartwood that is machined to fit. This has stiffened the whole
front end and created a much more solid motor car. Worn coach
bolts replaced with new.
Front spring shackles and shackle pins: the spring shackles
were bolted directly through the spring eyes with no bushes and
those eyes were worn hopelessly out of round. Geoff Luck of
Beeston has machined them to true (tempered spring steel!) and
hand made replacement oversize shackle pins (six). Absolutely
superb work which has returned the spring position and settings
to 'as new'. No side movement and very firm. This has added to
the rigidity brought about by the replacement cross member.
Steering parts, king pins, bushes and lower ball races: remade
to original dimensions by Group Precision Engineering of
North Walsham. The lower ball races made in special D2 steel and
sent away to be case hardened in the Midlands. Again, superb
work that is restoring the steering to 'as new'. Ken Hilton and
Pete Wilgoss have stripped and rebuilt the quadrant steering box
and eliminated the play that was evident. Again very good work
and all this restoration will add to the precision of the
steering.
The team have so far spent a total of just under 180 hours on
this overhaul which is not bad considering the demands of the
work and very slow pace because of the need to feel our way with
each job and the great care needed for each operation.
The museum, through Vanessa, Ruth and Robin have come up trumps
with the finance. To date the costs of making replacement
parts have reached just over £800 and we received the invoices
yesterday and Martin Lawrence had processed them and arranged
payment by 3.00 p.m. This brilliant support adds to the team
confidence and makes us realise just how supportive the
administration is. Best of all it makes us feel appreciated as
part of the larger museum team.
Overhaul
notes March 31st March 2013.
Because of a blockage behind the impellor it was necessary to
strip the water pump and remove the shaft. Heavy wear was found
at the drive end where it passed through the plain DU bearing.
The shaft was not stainless but EN24 and the DU bearing bush of
steel backed bronze.
A new shaft was made of 10mm
BN3 which was case hardened where it runs through the impellor
bearing to prevent wear at that end. The pump body was bored out
to 19mm at the drive end and the plain DU bearing replaced with
two sealed ball races of 10mm internal dia. and 19mm external X
5mm width.
Whole reassembled with the
shaft dabbed onto the bearing centres with Loctite.
Phil Waltham
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