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  1. mr300z87

    1989 5.7L 4brl won't idle below 900 - 1000 rpms

    Yesterday I helped another friend prep his boat, my old Invader. After gear oil change, flat tire repair and a failed attempt to replace temp over heat sensor her 5.7L Rochester 4brl bravo 1 fired right up. This is a reman 5.7 with all the original bravo bits and pieces from the original...
  2. mr300z87

    496 bravo 3 3000 RPM plus overheat

    Yesterday I help my friends launch their 2004 Formula 31PC with twin 496 mag Bravo 3. They are closed cooling, with about 400+/- hours. Raw pump impeller was new last season he was told by the mechanic who used to work on it for PO the Exhaust was new and never run when they bought the boat in...
  3. mr300z87

    Deep cycle/dual purpose/start battery

    As we approach boating season I was thinking of replacing 1 of 3 batteries on our 90 310 Sundancer twin 7.4L inboards. We used her all last season with the 3 unknown batteries that came in her when we bought her in 11/21. She currently has 2 battery banks 1 consisting of 2 group 27 marine...
  4. mr300z87

    Thru Hull valve repair or replace

    So one of the other items needing repair on our 90 Sundancer, besides the VacuFlush, see thread below, is the AC system. I was told by the PO it did not seem to blow cold. The first thing I noticed was the hose from the thru hull valve to the strainer look to be in sink your boat condition. I...
  5. mr300z87

    Help with Vacuflush system

    Hi All, We own a 1990 310 Sundancer this is our first season with her and so far we are very happy. One issue we are having though is with the Vacuflush system. I knew from before purchase the seal between the bowl and the mount leaked so the system would not hold any vacuum, I have since...
  6. mr300z87

    Re bedding bow hatches

    I am sure this has been mentioned before but here it goes. After washing the bow/deck of my new to me 1990 310 Sundancer I noticed the head liner around the forward V-Berth hatch was wet. I figured it needed to be re-bedded as a PO put a bead of sealant on the outside but had it down on my...
  7. mr300z87

    Nav lights only work battery 2 or both

    Yesterday while showing our new to us 310 Sundancer to a friend, I told him I had replaced the masthead light on the windshield and the stern light on the transom, when I flipped the switch I had no nav lights, I was like wtf they were just working. The boat has 3 batteries, one for the port...
  8. mr300z87

    Furuno Model 1712 radar

    Hi, My name is Mike and I usually hang out in MerCruiser and restoration forums, I have question about the Radar system on our new to us 1990 Sea Ray SunDancer 310. She was originally equipped with a Furuno Model 1712 Radar. We are bay/fair weather boaters and have no real need for radar, so I...
  9. mr300z87

    Bilge Blower replacment

    Not sure if this is the right place to ask this question but here it goes. I am in the process of replacing 1 of the 2 blowers in our new to us 1990 Sea Ray 310 sundancer. Both were working but 1 makes a horrible screeching when turned on. Before removal I ran them and noticed that 1 draws...
  10. mr300z87

    MerCruiser 7.4L Bluewater Exhaust

    My wife and I are the new owners of a 1990 Sea Ray Sundancer 310 with a pair of 7.4L Bluewater inboards I do not have the serial #s but they are definitely 90 vintage Gen 4s. I know they need some exhaust work there is corrosion where the Manifold and elbow meet. I also know they are full...
  11. mr300z87

    Mercruiser 7.4L Bluewater inboard winterization

    Hi All, It been a while since I have been on the forum, the 7.4L/Bravo1 in our 250 Sundancer ran great all season. My wife and I decided is was time for an upgrade and we sold the 250 and purchases a 90 Sundancer 310 with twin Gen IV 7.4L inboard engine with V-drives, haven't had time yet...
  12. mr300z87

    New prop recommendation

    Hi all, I usually spend my time in the boat restore and mercruiser forums, now I need some assistance here. I own a 1990 sea ray sundancer 250 powered by a 7.4L carb, bravo 1, on the 4th we went out with a full load of people and stuff for fun and fireworks. She struggled to get on plane...
  13. mr300z87

    Gen VI 7.4L Valve tap

    Over the weekend my GenVI 7.4L developed a valve tap that can be clearly heard in the attached video. Using the method described in the Merc Manual i think I have isolated it to the Exhaust valve on number 1 cylinder. From what i read this engine should have Hydraulic roller lifters. When the...
  14. mr300z87

    Failed 1 yr old battery??

    Last weekend we met some friends out at Tices shoals a local anchor spot, in our Sea Ray Sundance 250, when we first got there I switched over to what I thought was my start battery and tried to re start the engine with out success. Switched back to both batteries and she fired up no problem...
  15. mr300z87

    1996 Johnson 90 SPL won't plane intermittently

    My friend has a 1996 Johnson 90 SPL on a Aquasport 17 center console that is having and intermittent problem running above 3000 RPM. The symptoms are a slight miss at idle barely noticeable if not used to the engine, when throttled up it will only get to 3000 RPMs and will not get on plane...
  16. mr300z87

    Gen VI 7.4L Bravo New Raw water pump fail on initial start up! Why?

    So today I installed a new Impeller and pump housing on my 7.4L. This is the engine mounted pump with the fuel pump mounted to it. I started this morning by removing the entire assembly so I could change the gear oil in the fuel pump cam area. I then install brand new Mercrusier parts with a...
  17. mr300z87

    2003 Yamaha 225 4 stroke stiff shifter

    Hi all, I am posting for my friend as he is not computer literate, my boats have been I/O I mainly hang in the mercruiser section and restoration forums. My friend has a 225 Yamaha 4 stroke and has owned it since new. He being and airline mechanic by trade has maticulusly maintained it. The last...
  18. mr300z87

    Mounting transducer in hull

    Not sure if this is the right place for my question but it is related to my electronics so here it goes. I have a 1990 Sea Ray Sundancer, I had installed the transducer for my Chartplotter/Fish Finder in my bilge 2 seasons ago with standard silicone caulk from Lowes. I am using this for depth...
  19. mr300z87

    Weird high idle issue Gen VI 7.4L carb

    I am having a weird high idle issue when coming off cruising speeds and I am not sure what to look for. The boat is a 1990Sundancer 250 with Gen VI 7.4L/Edelbrock carb bought new in June of 2017thunderbolt V ignition with knock sensor. The boat runs awesome no issues getting on plane cruises...
  20. mr300z87

    Trashed Carb'd 5.7 Swap to 5.0L EFI

    So here is my situation, I have a 1989 Invader V210 cuddy cabin that is in near perfect condition. It has been in dry dock for the last 2.5 seasons because of a trashed 5.7L and a running Sea Ray Sundancer 250. See link for back story...
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