1990 200tdi 90 has been playing up when starting, especially when left overnight. battery is good but turning the key all appears to be dead.....no noise. knocking the starter motor with a long pole does the trick but has been getting worse and now will only start with a push. yesterday the engine turned over but there was a loud rattling noise(like you try and turn the engine over but its already running) type of noise. removed the starter motor today with the intention of replacing it....bastard of a job....thing is could this be due to something other than the starter motor?,,,while the starter motor is off and before getting a replacement is there something else i should check......ps it waqs a ****e getting it off, christ knows how i;m going to get one back on!