This week another Leyland 680 engine arrived! It is a vertical engine from a 1964 Scammell lorry.
The engine has a cracked cylinder block, but was bought to increase the pool of engine spares (vertical and horizontal 680's have many common parts) and to donate a piston and rod to the spare L11 engine, and a rocker cover to the spare 'road' 680 so both these engines are complete..
Although its been a while since the last post, work has been carrying on with the gear controller. The problem
was that the interlock ball bearing was sticking in its hole. Any lubrication
only made it worse! So the controller was stripped down, the hole slightly
enlarged and the whole lot re-assembled!
We have also
been looking at M56160's roof ventilators. These are made from folded steel, and
riveted to the aluminium roof, with aluminium rivets. The combined effects of
the galvanic corrosion, caused by two dissimilar metals touching, and the
different expansion rates of the two metals has been a long standing problem
dating back to BR days. The result is that the rivets fail and ventilators and
roof sheets can become loose. We have therefore taken advice from a metallurgist
at Sheffield University, Airbus, Land Rover, and
We discounted replacing the aluminium
roof panels with steel (Park Royal used aluminium to save weight, but in
preservation use this will not be an issue). Titanium fasteners were ruled out
too - mainly on cost grounds, So we are going to try 3M VHB tape to stick the
ventilators, and eventually roof panels on. Being a foam tape it isolates the
two metals, doesn't require any more holes to be drilled in M56160, and is
extremely strong (good enough to stick airliners together!)