[Bill Taylor]

Where is the picture?

[Bill Taylor]

Welcome aboard:   I have a 1998 4087.   The only way is to replace with digital.  Check out aetnaengineering.com.   They are somewhat smaller in dia, but it is an easy install.   Go for four and you can use the wiring for the existing tacs as they are driven off the flywheel.    

[Bill Taylor]

Mystery not solved, however things seem to be working. Pressurized the system to 15 psi empty and let it sit for 3 hrs. Pressure dropped to 13. Then filled the tank and re-pressurized the system for about 30 min. Pressure dropped to 12. Put on tank lid started her up, ran at 1500 until temp reached 180. No leaks nothing but normal. Cooled her down took off the cap level not changed. No smoke, just a smooth running 6BTA. Up shot is lots of coolant in reserve and a new pressurize tool. Just another boating day and another boat buck spent. Thanks again Rob for your help.

[Bill Taylor]

Rob: Thanks for your reply. Upon investigation everything is dry, expansion tank and recovery bottle. I have not removed that 5/16 sq fitting yet to see if there is anything in the block. As for checks, I did a cursory check the last time I checked the oil which was in Sept. and everything appeared normal. On that trip I ran at 2200 rpm for about 40 minutes and the temp was normal. Everything ran so well during the summer. No oil needed, no smoke. I ran at mostly at about 1800 which provided a comfortable ride given various weather and sea conditions. She just purred.
Yes I agree that 800 likely would not open the thermostat, but running in gear at the dock could be an issue stepping up to 1000.
I have another issue with my Cummins. Taking an oil sample when the engine is running. I have been unable to find a device or location of a port suitable for that task. Perhaps I should start another topic.
I am about to get a pressure test device before I refill the system. 20 ltrs is a lot of antifreeze to waste and to put into the water. Thanks again, any other suggestions welcome. Bill.

[Bill Taylor]

Rob: Thanks for the info and the diagram. Now only have to decide whether I need the shielded cable. As for the LED, thanks, yes on the fly bridge it will have to be LCD for sure as I only operate in the day light. I am also looking at installing the ISSPRO R609 Turbocators on the fly bridge. As an old gas man my diesel learning curve is steep and question keep arising. My next issue will be bleeding especially when I am changing fuel filters. Oh well live and learn. Bill.

[Bill Taylor]

Greeting: I am about to install at least two Aetna 8402R-DS Tachs on my 1998 Bayliner 4087,engine 6BTA 5.9. I have been told that Bayliner installed the magnetic device and Faria tachs and developed the wiring harness. My question is will the current mag devices driving the Faria tachs provide the necessary data for the Aetna if connected in series using the existing drive units or should I bite the bullet and install four Aetna units along with new sending devices and wiring. The issue of installing units in series is also a question as it will dictate the sending units. It would certainly save time and effort in wiring and reduce the cost somewhat. Comments Please. Regards Bill.

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