Dear all, can anyone give me a definitive answer as to what engine parts are the same, if any, between a TY175 (engine number is 525-2***** which is 1977 on) and a DT175 of approximately the same year? I need to strip my engine (it's burning the gearbox oil and so running like a dog) and I have been told by a couple of 'experts' that the 2 engines are identical but how can they be as they are intended for different uses? I accept some parts may be the same to keep production costs down but I don't want to buy any parts in the hope they may be the same. Also, who in England are the best people to deal with for TY parts? I don't necessarily mean the cheapest but the best quality parts and service? Thanks.