97 efi 0g584347, hit stump with lower unit, i replaced it with a newer style lower unit "with water pick up in nose cone" my water pressure was around 12 but now its about 20 and bouncing all over the place while running wot. Is it going to hurt anything on my motor?
When adding a low-water style pickup gearcase to an EARLIER design engine, there WILL be a NOTABLE water pressure increase.
If RPM's, performance and handling conditions allow, try RAISING the engine in 1/4" increments, but keep your water pressure AT OR ABOVE 18 psi for safe measure (15 psi minimum for this gearcase design).
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 48 years (learn something new every day).
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So running the new style gear case at 12 lbs is not good for the lower unit or motor?
<table width="90%" cellspacing=0 cellpadding=0 align=center><tr><td>Quote, originally posted by nobody2u »</td></tr><tr><td class="quote">So running the new style gear case at 12 lbs is not good for the lower unit or motor? </td></tr></table>
Correct. WOT water pressure with low-water type intake gearcases would be an indicator that the water supply may be aerating (starving water pump and engine of proper cooling media).
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 48 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
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