Recent content by 686SPORT

  1. 6

    5.0 OSi-JF overheating at speed

    Yes, your boat has much better access as well as lighter components. Mine has a deck above, batteries and black water tank on the outsides, and the other engine on the inside. Very tight even with a 10' beam. I still have an old coffee can full of Datsun L-series head bolts left over from...
  2. 6

    5.0 OSi-JF overheating at speed

    No report from the Manatee off Highland Shores?
  3. 6

    5.0 OSi-JF overheating at speed

    alldodge wrote: No need to hold all the weight just to get the bolts in. Just like when installing cylinder heads; done that many a time. But never having done boat manifolds, I wanted someone more qualified on the job, too. The first guy who said he'd work on gas motors declined because of age...
  4. 6

    5.0 OSi-JF overheating at speed

    One more trip to the boat and took along a friend with a lot of i/o experience - just not with V-P's. We started the engine and put it in gear at idle while tied up at the dock. After about 10 minutes we began reading high temps off the dash gauges and with the infrared pyrometer. At this point...
  5. 6

    5.0 OSi-JF overheating at speed

    Got some clear tubing and measured raw water pump flow at idle. Starboard [the problem engine] was only a tad bit slower than port. No bubbles. Checked flow in hose from exchanger to an exhaust manifold; almost as fast as direct pump output. Conclusion: it's got to be elbows, risers, manifolds...
  6. 6

    5.0 OSi-JF overheating at speed

    Don't know how many seasons in salt/brackish. We bought the boat on a tip from the dealer where we had bought our previous Chaparral - also with V-P power. We had them do a compression test, and bought the boat based on those numbers [175 +/- 5] and the very nice condition of upholstery and...
  7. 6

    5.0 OSi-JF overheating at speed

    Thanks for the tips. Planning to do a variation of the first suggested one: remove upper connection of raw water pump outlet hose, reroute it to a 5-gallon bucket and run engine while timing 20 seconds or so. Repeat with other engine, again measuring what collects in the bucket. Finally, pull...
  8. 6

    5.0 OSi-JF overheating at speed

    Bump to top. Nobody has had this problem?
  9. 6

    5.0 OSi-JF overheating at speed

    2008 V-P twins, type 5.0 OSi-JF. "F" as in freshwater cooled. We bought the boat late last year, and I motored about 75 miles from Great Bridge, VA, to new home in Urbanna with no problems at all. Family health issues have kept us away from the boat for most of this year; it's a 3-hour drive...
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