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  1. 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...
  2. mr300z87

    MerCruiser 7.4L Bluewater Exhaust

    Yesterday after work I ran to the boat to re-install the raw/sea water pump, while I was doing so I noticed the hose going from the circulating water pump to the heat exchanger was leaking AF. A quick seach on the internet reveals this hose and the following generation 7.4L hose is NLA. There...
  3. mr300z87

    MerCruiser 7.4L Bluewater Exhaust

    SUCCESS!!!!! All bolts are either out or loose, I have not removed outer manifold on port motor yet but since all the bolts have been loosened that is an easy task to remove and replace. These fluted sockets worked great grabbing the stripped bolt heads. Once I had both center manifold off i...
  4. mr300z87

    MerCruiser 7.4L Bluewater Exhaust

    When I took the old Manifold out of my truck I noticed what looks like a date code next to the casting number 1F97. Is is possible these manifolds are 25 years old? They are part of the closed cooling?
  5. mr300z87

    MerCruiser 7.4L Bluewater Exhaust

    Well I had some success yesterday although not exactly what I planned. Although I was unable to remove the bolt I am struggling with I did remove the Port engine center manifold which gives me much more room to work. Note there would have been enough room to slide it off the cut bolt even with...
  6. mr300z87

    MerCruiser 7.4L Bluewater Exhaust

    Thanks Bondo, but it's not the bolt you can see it's the one on the manifold to the head that you can not see. The elbow to manifold joint was leaking right at bolt the arrow is pointing to and ran down and corroded manifold bolt. I do not think the bolt is frozen in the threads as all others...
  7. mr300z87

    MerCruiser 7.4L Bluewater Exhaust

    no room to do anything arrow point to where I am working
  8. mr300z87

    MerCruiser 7.4L Bluewater Exhaust

    I am think this is the ticket on my dremel.
  9. mr300z87

    MerCruiser 7.4L Bluewater Exhaust

    Was going to try and use my dremel with the cut off wheel, but the are so fragil I was thinking of buying something better to use. Any recommendations? It is ver tight between the engines and I can not see the bolt head at all. I'm going to try and contort myself in there for better vantage...
  10. mr300z87

    MerCruiser 7.4L Bluewater Exhaust

    Thanks Scott, yes that is the plan. I will update after I get to the boat. Stinks not having it in my yard like the 250 Dancer. Question, on the 7.4L in my 250 I used stainless bolt for the manifold with no issues. Came right out after 5 years when I replaced the Manifolds. I thought I...
  11. mr300z87

    MerCruiser 7.4L Bluewater Exhaust

    Hi all its been a while. Weather is looking up and marina needs me launched mid April. I am so not ready. Today we started removing the crusty old exhaust, started on starboard motor outer side all came apart with no problem. Center side did not go as well but all in all could be worse...
  12. mr300z87

    MerCruiser 7.4L Bluewater Exhaust

    happy holidays to all
  13. mr300z87

    MerCruiser 7.4L Bluewater Exhaust

    AD I agree, that what all the diagrams I saw show. As mentioned above I expect to find aftermarket junk for a gasket. I was going to head to the boat today to take some notes and photo but its gray and to cold out so I think I just going stay home and keep the fire going.
  14. mr300z87

    MerCruiser 7.4L Bluewater Exhaust

    So the block off plate I showed above requires a gasket on either side? I though the block was the gasket. I looked up the part number on ebay. it looks to be the same material i used on my raw cooled I/O. My elbows have 4 bolts per. I do see some stainless blockoff plates from Barr...
  15. mr300z87

    MerCruiser 7.4L Bluewater Exhaust

    Always good to hear from you AD. Thanks to all for the info. I am sure the elbows are shot, just hoping not to have to buy Manifolds also. I have old exhaust studs I use to support the manifolds during removal, I did an exhaust last year on out old boat's 7.4L. I would expect this gasket to...
  16. 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...
  17. mr300z87

    Mercruiser 7.4L Bluewater inboard winterization

    Thanks AD that what I figured too. How have you been, the old 74L in my 250 Dancer ran great all season so I was not on here much. She just went to her new home Sunday. We are ready to start our new adventure on the 310 Dancer. I was able to bring the stainer unit home from the AC system...
  18. 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...
  19. mr300z87

    New prop recommendation

    The swap back went great, gained the 3 mph at cruise speed I lost with the aluminum spare prop. All is well. Thanks again to Atlantic Propeller. I still may purchase a 4 blade 15 pitch to see if there are any gains in cruise speed. Don't care much about WOT speeds as I will almost never go...
  20. mr300z87

    New prop recommendation

    So I have been running with my spare aluminum prop now for the month of July all has been good. I had a new hub installed in my Mirage and I am headed now to do my 2nd in water prop swap. The prop was repaired by Atlantic Prop in Edison NJ for $100.00. Super nice guy and highly recommended...
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