Concerned my mechanic isn't bothering to work on my car...

The timing chain broke last weekend, and it's going to be a lot of work to repair everything. I'm not sure what all went wrong, but I have a feeling they're a little intimidated by the idea of tackling such a labor intensive task. They're good mechanics, but slightly unmotivated. Island time, I guess; I've lived here (Virgin Islands) long enough to expect and understand that. On the other hand, I want my car back. Right now I'm driving my '88 Trooper. The only thing I thought of to prod the mechanic along is telling him someone is REALLY interested in buying the Trooper, so I need the Benz back as soon as possible. Any suggestions on getting them motivated?