I'm keen to buy a Troopy and have found one that looks pretty cheap for the km but the owner says it's not running. It's a 1993 with a high top conversion and 300,000km and she wants $AU9500 for it. "The head gasket got changed.. so there is air in the system and the timing of the injector pump needs to get adjusted then as well.. I would have done it but I ain’t got the tool" How serious a problem is this? I'm concerned about buying a truck that's not running because of the risk that there could well be other issues that won't reveal themselves until I can actually get the engine going.