Capt Rob, I did order a tach yesterday so it will be a few days before it gets here so I guess I will wait until then to start.The previous owner did install the electric fuel pump and I ran the boat up the ICW from Port Charlotte to Port Ritchie with the engine running just fine and it would rev up to 3400 rpm cruising but I backed off to 3000 rpm as per the Yanmar manual.I replaced a bad as in it separated throttle cable inside the helm just a couple of days ago which picked up the rpms by maybe 3 or 4 hundred.I think I will take your advise and wait until I get my tachometer and not do anything until I verify my true rpm.The electric fuel pump was exactly the same brand as the one that burned up and blew a 3 amp fuse.I had just changed the fuel filters and it wouldn't prime until I verified the pump was bad and had the blown fuse then it primed to the secondary fuel filter bleed port in maybe 30 seconds with the new pump.I am sorry but I can't verify the gpm on my new pump but when I installed it the rpm went up some to 2600 where I am right now.I am docked at the marina in Demopolis,Alabama 217 miles up the ICW from Mobile Bay and don't want to risk going out of the harbor because the river is above flood stage.Thank you Sir for the great check list and I will post more info when I have it since I will be going down to the boat tomorrow and maybe the new tach will arrive this week.The more I read about what to check I suspect the in boat tach right now.Thank you again, James
James, Thanks for your reply. Changing the tach is good, However, you must really validate the sensor pickup too and assure the right voltage and wires are correct for this application. Some people I've heard used BUTT-CONNECTORS to splice in wires to add a
few feet / inches only to affect the current/voltage drop across there gauges. You must NOT take any shortcuts if you want to make this right! Follow the harness wires to ensure no added components are present(Resistors/filter cap's too!
PLEASE validate your fuel pump
12VDC DIESEL TYPE ONLY AND PSI and GPM! and
NOT a gas type. Gas type impeller will not work but, give the impression it is.
IF you are not sure on any item just REPLACE IT! save yourself time or guesswork that ends up costing you continuously money and grief.
Ralph Johnstone stated check your elbow for your elbow being clogged this would also lead to a higher engine temp as a result of poor water flow out of your heat exchanger as well. A quick way to tell is to during an idle condition VALIDATE that you have
good water flow exhausting out of the exhaust with little or no smoke many symptoms of poor flow means you have to start from scratch in this area. From your seacock to filter to heat exchanger... etc
1. this is an easy test to check the flow from the heat exchanger output is unrestricted. Easy remove the hose from elbow to engine and extend a hose overboard or in your bilge and start your engine IDLE only to see that you have a good flow rate? Y or N if Yes put the original hose back on and continue. IF NO! bad rate. proceed to Walmart and buy a .22 gun cleaning kit, CLR cleaning solution and new rubber gaskets for the heat exchanger there are a total of 4 gaskets cheap, not bad. First, remove the front cover that has the hoses going into the heat exchanger with a flashlight look into the heat exchange to see any white buildup? Y/N None then put the hose back on and move on! YES then remove front cap and use the gun cleaning kit to clean the tubes. start with copper bristles dipping into the CLR and clean the tubes all the way to the end. That's each tube. Now inspect the cover if corrosion or the little V shape notch is filled in then soak in CLR and clean good. carefully poor CLR into all tubes to allow CLR to clean the back one while in place. Allow extra 2hrs for the cleaning process to be completed. put back together WITH NEW SEALS and start your engine and verify water output to the exhaust is improved? Y/N Yes the move on! NO replace your ELBOW its clogged.
What I decided to do is after using my engine in salt water rather than having it sit with salt in it I shut the valve for salt and use my freshwater tank to flush all salt out before I shout down my engine. FOOD for thought!