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TOPIC: water in starboard pistons

water in starboard pistons 13 Jun 2009 10:57 #1

  • darkmagician593
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I have a 2005 285 with the 350 Mag MPI engine. The boat was new when I bought it. It has around 700 hours now and has been meticulously mechanically maintained by my marina mechanic.
Last weekend when coming back from Chesapeake City, MD the motor starting acting real funny when I was getting close to the home marina -lost rpms, chugging feeling. My mechanic pulled the plugs and there was water in all 4 starboard plugs - none on the port.
They pulled the exhaust, riser and manifold off to see if anything jumped out at them. Everything looked good so instead of tearing into everything quickly they thought lets put it back together and see if it was a fluke (water ingestion through some exhaust valve maybe? )
Anyway it was a no go - they took it for a spin and the same thing happened. Water came out when they pulled the plugs.
The engine is getting pulled out on Monday and they are going to really tear into it to see if they can find the cause.
Has anyone else experienced something similar in a relatively new boat?
Secondly I have the Passport warranty through Brunswick. I am praying to God that the cause of this is listed in that damn booklet.
Has anyone else ever made use of the Passport protection for an engine problem and did they do a good job with your claim?
Thanks in advance
Jim

PS I should also mention that the boat is stored in a completely enclosed boatel year around and there is very little salt content in the water, if any, in the northern part of the Chesapeake Bay where I boat.

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water in starboard pistons 13 Jun 2009 14:45 #2

  • HotelCaliforniaSYC
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Seems odd to have water in all 4 holes but it sounds like a classic head gasket or cracked head casting to me.
Do an 8 cyl compression test both wet and dry and I'm sure you will find it. Either way, my guess is the starboard head's coming off.

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:cool: Doug
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water in starboard pistons 13 Jun 2009 14:49 #3

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... or a cracked riser.

That's an easy way to get water in a whole bank like that

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water in starboard pistons 13 Jun 2009 14:59 #4

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SomeSailor;309078 wrote: ... or a cracked riser.


Possibly, but it happened at cruising speed and normally you only flood an engine from the exhaust side at idle speeds or stopped.

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:cool: Doug
1987 3270 US Marine Ga$$ers
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water in starboard pistons 13 Jun 2009 16:12 #5

  • boatworkfl
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If the engine is under warranty I would see about a new engine, who knows what damage is hidden there. Pat

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Pat says: DO-IT-RIGHT THE FIRST TIME!

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water in starboard pistons 13 Jun 2009 16:16 #6

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HotelCaliforniaSYC;309082 wrote: Possibly, but it happened at cruising speed and normally you only flood an engine from the exhaust side at idle speeds or stopped.



Well... I'm assuming he idled at some point before he reached the dock... :D

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water in starboard pistons 14 Jun 2009 04:15 #7

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Intake manifold or gasket?

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Kelly Mahoney, Ocean Park, and Vancouver WA http://www.baylinerownersclub.org/gallery/album839

water in starboard pistons 14 Jun 2009 13:19 #8

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Well think about it;

Water can only get to 4 cylinders on one side a couple of ways. Since we're talking about only the one side you can focus on the items on that side of the block.

Only thing that comes to my mind is a riser or maybe a flapper stuck shut.
A head gasket would generally not be 4 cylinders.
An intake would affect both sides.
A surge in water up the pipe would be a one-time fault (they repeated it next time out).
A cracked / corroded exhaust manifold would generally only affect adjacent cylinders.

I'd go for the risers. He's gonna need them changed eventually anyhow and the they're easy and relatively inexpensive parts.

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water in starboard pistons 19 Jun 2009 16:41 #9

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well I got the verdict today - it was a crack in the starboard exhaust manifold. After the engine heated up, the crack would open up and allow water in to the pistons. That is why the boat was running fine when it first started and only had issues when coming back down to idle speed after running a while.
They are going to replace both manifolds and risers as well as do a 300 hr service (plugs, rotor, fuel filter etc.)
Parts got ordered today and they said they''ll have me back in the water by next weekend. All for the small sum of around $3000
Hopefully it will be good now for another 700 hrs! :rolleyes:
Best,
Jim

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water in starboard pistons 19 Jun 2009 16:50 #10

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Id run the boat, and do a few oil changes too. I hate water in cylinders.

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Matt Train
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water in starboard pistons 19 Jun 2009 17:15 #11

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Matt
They said they were going to do that as well.
Once it is all put back together they are going to run it for awhile and then do another oil change on it to try to make sure there isnt any water in the oil.

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water in starboard pistons 19 Jun 2009 19:38 #12

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Yikes, $3,000! I understand now why I do my own mechanical (on everything but the gears, etc. in the leg). The motors are not rocket science, and with a manual and some good advice, things usually work out well. 700 hours in fresh water seems like a short life for those parts.

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Bob Hawes.
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