1993 Merc 150 XRi has been having overheat issues that I thought I fixed a while back but it's still acting up. Did T-stats two weeks ago and found an issue but it didn't fix it completely. Poppet was cleaned at the same time. Ordered a water pressure gauge and plumbed it last night. WP at idle read about 3 psi and ran up to about 6 when revved to 2K in neutral. Until I put it in the lake I'll not know the full story but that will have to wait until the weekend. Temp sat at 145 degrees or so.
I plumbed the gauge in the hose that runs from the fitting that is in the center of the block right behind the flywheel. This hose ran down to another fitting on the bottom starboard sise of the block. I think the manual called it the bypass hose. This was a 1/4" rubber hose. I replaced the hose with new hose and plumbed in a brass "T" fitting to add the gauge. My question is: Considering how temperamental the 150s seem to be, I was concerned about the restriction caused by the T. It's a 1/4" T fitting but obviously the inside I.D. is a little smaller than the I.D. of the 1/4" hose. Any problems? I would think it would reduce flow by 10% or so- agreed? Remedies or ideas?
I plumbed the gauge in the hose that runs from the fitting that is in the center of the block right behind the flywheel. This hose ran down to another fitting on the bottom starboard sise of the block. I think the manual called it the bypass hose. This was a 1/4" rubber hose. I replaced the hose with new hose and plumbed in a brass "T" fitting to add the gauge. My question is: Considering how temperamental the 150s seem to be, I was concerned about the restriction caused by the T. It's a 1/4" T fitting but obviously the inside I.D. is a little smaller than the I.D. of the 1/4" hose. Any problems? I would think it would reduce flow by 10% or so- agreed? Remedies or ideas?
