Lister TR3 air cooled Diesel, 3 cylinder, 2325cc No oil seals but valve stem seals included. Equates to 657-33391 Weight of set and packing approximately 1000g Pack size 310 x 430 x 40 The manufacturer recommends that the TR3 engine is overhauled after 6000 hours, including the replacement of all joints and seals. This proceedure will require a full gasket set.