As a newby to the forum I would like to ask. Does anyone know for certain if you can replace diesil injectors which are situated under the rocker cover without removing the cylinder head. If so I might have a go at DIY but if not I will let the mechanics do it. I was quoted £130 to £150 to replace # 3 with a refurbished one.So if anyone knows for certain post a reply please. Thanks nottusnala.