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Author Topic:   water pressure gauge
wilson posted 11-28-2006 10:43 PM ET (US)   Profile for wilson   Send Email to wilson  
my 2004 montauk 170 w/90hp 4stroke was dripping water when running, from what appears to be a engine temp sensor located just below the oil filter. when repairing leak discovered it actually is a fitting with a plastic hose that goes all the way thru the rubber wire harness plug on front of motor and continues to the back of dash where what I assumed was a oil pressure gauge is actually water pressure read in psi. [gauge on dash is water pressure] appears that mercury ships motor with a plug in block that can be removed and fitted with a temp gauge or mechanical water pressure by the installer and the 170 comes with pressure gauge installed by BW at production. Had till now just assumed gauge on dash was oil pressure being 4stroke engine! I suspect leak occurred when black plug for wire harness had been pulled out of place as other's have mentioned on previous posts and allowed that plastic hose to get yanked around. Had to trim hose slightly and replaced fitting at block. Anybody else that had the black wire harness plug pull out of front of engine may want to check for possible water leaks while engine is running. I noticed running engine on hose after oil change.
Clark Roberts posted 12-05-2006 06:50 PM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
My 115 Merc EFI four stroker is fitted with a water press gauge and oil press gauge. The water press tube plugs in as discribed above and so far no leak problem. As a matter of interest the water press runs about 7-10psi at idle and 15-20 psi at 4500rpm cruise and oil press runs 55psi at idle and 95-100psi at cruise.

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