An older engine, it has run in the past for long enough to cause wear in big ends and one eccentric, each of which contribute to a knocking when running.
| length/inches | 17 |
| width/inches | 10 |
| height/inches | 15 |
| weight/kg | 19 1/2 |
| bore x stroke/inches | 2 x 2 |
| axlebox type | plain bearing |
| cylinder material | cast iron |
| valve type | slide |
| valve gear | Allan straight link |
| reverser type | screw |