The Westerbeke installation of most GB (and copies) installation runs for/aft with service easy on all sides. Wifes company has installed a few and it's a great package. I do understand the OPs issue, gear driven raw water pump, facing aft, just ahead of the starter, all under the heat exchanger / exhaust manifold. This was just the wrong model gen set for it's installation orientation. Sadly our new friend, your in a pickle. I would invite your delivering sales and service location to service it for you. Also, send a letter to SeaRay and ask them how to service it. If this was a new purchase, you may have a voice. Keep in their hair and maybe another gen set model deal can be had. On The Other Hand;; This is why we do recommend a survey on even new boat deliverys. I can go on about not thinking about service issues but your already taking a beating on this and hind sight does suck. Good luck.