How to / DIY > Engines
dk with the shakes
lewis66:
i have just over hauled a dk which had the factory conversion fitted and still had 2 head gaskets , it ran fine but needed a good decoke , i fitted a flat top piston just to make it correct and it runs fine but it shakes , crank / flywheel run true , timing spot on it is a 2hp 1000 rpm engine with the smaller flywheel , its ok at 750/800 rpm so might just change the gov springs , has anyone got any ideas ? my other 2 ''d's '' run dead smooth but are both 1.5hp 750 rpm units
mike90045:
I'd look at the piston weight, since that's what you changed. Was one iron and one aluminum ? Weight change makes unbalanced vibration.
lewis66:
both cast iron
BruceM:
The new iron piston is clearly a different weight. You'll have to add or subtract external counterbalance to get it running smoothly at your desired rpm. If it's a hopper, then add more counterweight. If it's a walker or moving fore and aft, it's got too much counterweight, so add opposite the counterweight.
lewis66:
hi yes i totally agree i guess that's why lister didn't include the piston in the dk conversion kit , i got the engine from the original owner who had it new in 1949 and fitted the kit , i presume listers balanced the engines according to spec ,
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