When I worked at MB Derby they always used the local Diesel Specialists to remove glow plugs & seized injectors. The success rate without taking off the cylinder heads was very high. When our Jeep WJ injectors started leaking the local garage used the same firm who do a mobile service as a lot of their work is on commercial vehicles. I have had all 5 injectors removed with seals & stretch bolts replaced. None of the injectors were damaged. They had a minimum call out charge of £100 plus around £50 per extra injector removed - they fitted the units back with bolts & seals included. Mine were replaced in two goes a couple of years appart. Pretty sure this type of specialist firm exists in your area.
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