Started my 1987 OMC V4 the other day on the trailer with the hose on the muff. The water pressure comming out of the pisser was weak (has been weak for a while). After a bit the horn went off and I shut it down. I took the cover off and it was hot. Sooo water pump time - it has been about 5 years.<br /><br />I have an air compressor that puts out about 120 psi and an unrestricted air gun. I would like to blow air through the system both through the pisser and water pick-up tube before reinstalling the lower unit. Is there anything in the cooling system that could be harmed by blowing this high pressure air through??<br /><br />I replaced the thermostats about 6 months ago. I have not pulled the heads or exhaust cover to clean any salt water crud and would rather not do that unless the new water pump does not keep it at operating temp.
