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1994 Mercury Pro Max Water Pressure
Read through lots of water pressure post this morning looking for an answer to my question and really do not see anything that matches up with my question.
Just purchased this Boat and motor, Vision with 150hp Pro Max. Owner said during test ride when I questioned him that water pressure gauge low pressure that it had always read near 0 psig on idle and 10 while running. I do not know rpm due to tachometer not working. This is the same situation I experienced on my first run as owner last weekend. I placed hand under water stream exiting motor and it was pretty darn hot after a 1.5 mile run from my dock. I have never owned a Mercury motor with this type of cooling exit system. I'm used to water flowing out of tattle tell at a high pressure at idle. Looking back and seeing water just flowing out of this hose just has me concerned along with the low pressure at idle speeds. I did read in my repair manual normal pressure at 5500 rpm is 12 psig. I ordered and received new water pump impeller, key and SS insert for inspection and replacement this morning. Also, no temperature gauge on panel. I do have a hand held laser temp. indicator that I can use on heads.
Please give some advise on normal water pressure for this type of motor, especially at idle and experiences with type of motor. Also what type of temperature should heads be running.
Thanks!