Lister TR2 air cooled Diesel, 2 cylinder, 1550cc No oil seals but includes valve stem seals, equates to 657-33371 Weight of set and packing approximately 610g Pack size 310 x 430 x 40 The manufacturer recommends that the TR2 engine is overhauled after 6000 hours, including the replacement of all joints and seals. This proceedure will require a full gasket set.