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 Post subject: Hydro-locked VP 5.0L
PostPosted: Sun Jul 17, 2022 8:14 pm 

Joined: Thu Jul 23, 2020 10:55 am
Posts: 4
A good day on the water ended badly. Rolling ocean waves, a boat passing with a large wake and my slowing the 298Vista created a surge that hydro-locked the Port engine. Limped back to the mooring, moved quick to pull the plugs, load them up with penetrating oil and the engine cranked. #1 cylinder was filled with sea water. Fogged from the carb down and hit all 8 cylinders with oil a 2nd time just to be safe. No water in the engine oil, i will be replacing that oil as well. Checked compression which was good at 150PSI. Replaced plugs, engine cranked but would not start. gave it a shot or two of starting fluid without any luck. Pulled plugs to triple check, all good. Checked coil which tested good. Spark at the plugs seems weak at best so getting new cap and rotor. Fingers crossed that does the trick. Checked the flappers at the start of the season when I replaced Manifolds and Risers, they looked good. Not taking a chance and planning to replace flappers on both engine exhausts. Beyond checking the coil, replacing plugs, cap and rotor, any thoughts on what might get the engine fired up? This is a 99 298 Vista with twin VP 5.0s. Thanks in advance for any replies.

Current: FW 298Vista 1999 twin 5.0Gi
Past: FW 278Vista 1995

 Post subject: Re: Hydro-locked VP 5.0L
PostPosted: Wed Jul 20, 2022 10:43 am 
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Joined: Thu Jun 29, 2006 10:26 pm
Posts: 5612
Location: Long Island NY
V/P eliminated those flappers so you may not be able to get those parts from them, but OMC used the flappers til the end (they shared designs with the Cobra series and the Volvo SX) so if you can't get them from Volvo you can still get them from OMC. However, if the engine didn't overheat they are probably fine.
I'm wondering if the oil in the cyls fouled the plugs preventing it from starting, or another problem developed coincendentally at the same time. Check for spark, check for fuel....new cap, rotor, also check plug wires for resistance....
I never thought V/Ps decision to remove flappers was a good idea. You might also measure the static water line in your boat to make sure your exhaust elbows are tall enough. Should be 12-13" above the static water line. Add ons like heavy extended swim platforms and tables, etc, lower the stern of the boat enough to drop the height of the elbows low enough to cause hydrolock. V/P does sell a taller elbow/riser combination if needed.

88 Four Winns 200 Horizon
4.3 OMC Cobra-4bbl
2002 Walker Bay 10/2012 Suzuki 2.5
2008 Walker Bay 8

1998 Jeep Grand Cherokee 4.0/Selectrac
2007 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II

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