Sorry, not Vaux related I'm afraid but I'm getting desperate and I know there are some brainboxes on this forum
The engine concerned is a 240 hp blown intercooled commercial truck engine made by Valmet that is used to power by combine harvester (ooh aah). As such it runs flat out all day with a considerable and varying load in very hot dusty conditions.
The main problem is that it smokes like a pig and runs hot to the extent that our progress is impeded cos it has an automatic safety stop mechanism to save us from destroying the engine.
We've so far tried obvious things including the installation of new air and fuel filters. The air filter needs to be cleaned daily anyway. We regularly blow the rad out. We have had the injectors out and overhauled them. Its generally well maintained. The local combine service agents have given us their considered opinion which is that this effect is neither usual, nor desirable. They have no idea what else it could be.
Any ideas? I'm gonna have a delve into the inside of the intercooler in case that has got blocked up with shite. We've debated whether the mechanically driven fuel pump could be on its way out but we aren't sure how this being worn would manifest itself.