Work is coming on well on putting D6566's engine back together as Ian reports.
D6566 – Discussions were held with Kev Cook (who contract overhauled the engine components) to get advice regarding the piston installation and in particular to establish the correct piston ring orientation.
Using plenty of oil seeming to be the key to the matter!
On Saturday I was ably assisted by John Cooke and Dave L. and initially it was decided to just perform a trial installation of No.1 piston to check everything was ok.
A 1/2” BSW eyebolt was fitted into the piston crown and it was raised aloft using the electric hoist over the No.1 cylinder position.
The ring guide, kindly loaned by South Devon Diesel Traction, was used and it is necessary to monitor that each piston ring stays centrally in its slot as you lower the piston in and correct this using a screwdriver if necessary.
The exterior of the piston, bearing surfaces, crank journal and interior of the liner were all wiped clean before installation and liberally coated with oil.
To fit the big end cap, a rope was passed through the corresponding diagonal holes in the con rod and big end cap to pull the cap into position whilst the first bolt is inserted.
Cable ties were used to hold the top bearing shell in position and only cut just before the top of the crank journal was reached.
In fact the installation of No.1 went so well that we decided to also go for No.2 piston!
That took less than half an hour from the pallet to fitted.
The big end bolts have only been nipped up for the moment, we will pull them up to the marks and fit the retention devices in due course.
If all goes well we should get the rest in next weekend, the only problem may be having to move the roof along, but we now reckon it will be better to get the piston installation complete before moving on to the heads.
D6575 - The antifreeze strength has been increased by adding ten gallons of neat antifreeze to the coolant. If my calculations are correct that should take the concentration to around 30% which should give protection down to at least –15degC.
The loco was then used to do some shunting so should have mixed things up well.