Power, weight or prop? Help!

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Okay, things are now getting interesting.

There new been a new development. And, we need some advice or guidance to where this has been discussed previously.

After the boat would not plane, on Lake Hopatcong, We dropped it in the water near the Hudson. The performance was worse. Would barely make a bow wave while running at 3300rpm.

after talking to a well-regarded mechanic come along a certified Mercury service center, we are no closer to an answer. He actually turned down the work initially. Said he didn't want to work on another Optimax because he had four others that were impossible to get running right. But, he agreed to get us in at his next slot. Maybe after Memorial Day. We got the same delays from two other local Merc service centers.

but, here's the kicker.... We took the boat to a junkyard to have it weighed. Generally, (and I am open to being corrected here) The boat should weigh between 4800 and 5200lbs, with engine. With a big EZ loader two axle trailer, we are adding roughly 1500 pounds. 30 gallons of new gas. The verified weight? 8440 pounds!. 8440 pounds.

Of course, our first thought is that the boat is completely waterlogged. We pulled the plug and were guessing that about 10 gallons of water drained. Concerning, thinking there might be a leak somewhere. But, the boat had recently been bottom painted and nobody noticed anything significant. That's a lot of water for a leak we could not see. there had been a giant thunderstorm, including hail, the night before we went out of on lake.

Another element would like everyone's help on: there is an aftermarket deck cut out on the starboard side of the boat. Pictures attached. Clearly someone cut the hole and dug out the Styrofoam in order to patch starboard whole wall. It looks like a decently done patch. it was full up to the top. And, not draining. not showing up in the bilge. Now, we pumped roughly 5 gallons out of the hole. But, the water keeps on appearing. We keep on pumping it out in small bits. The bilge is now dry.

How can we drain or dry any contained water?

The boat has a built in diesel cabin heater. Doesn't make any sense to pump heated air into the hall somewhere in the bow?

How do we determine where the water is coming from? There is a very good chance it's coming from the badly sealed hatch cover. The boat may have had a couple of inches of water in the aft deck area. The only thing we know about the boat's history is that it was sitting for almost 5 years. We will reseal this hatch cover and see if that does the trick.

We are open to any and all ideas.
 

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It is a good idea on something likeproject to post lots of pics. It's free! LOL
Some pics are zoomed like an microscope but we need some zoomed out pics

m2cw The fuel tank is surrounded with foam. A leaky deck hatches or pie plates allows water to saturate the foam. The tank is in a box surrounded with foam but the top of the foam is not sealed. It is gets wet then using fans or pull the tank

A couple of fans might dry out but will take days or longer with guarantees

Open all hatches including anchor rode locker, all deck hatch inside the cabin and cockpit. all aft door hatches. I dont your layout.need pics


One fan sucking air outwards from the bilge or 2 fans

One fan blowing towards the sky over the fuel sender unit deck opening

One fan blowing towards the sky over the fill and vent hoses deck opening


good luck
 
Thank you for the input, Brent. Thanks all of you for helping.

One of you said that this was going to be a lot of trial and error.

Frustrating not knowing where to go next. But, we've managed to work through a few things. And, we have some updates.

You may recall that we had the boat and trailer weighed and the total shock to us at 8440 pounds. we've managed to track down the likely weight of our No-VIN number trailer. According to the EZ Loader, a similar trailer weighs about 1850lbs. other than the 225 Mercury, the boat may have 150 pounds of cargo and 30 gallons of fuel. The starboard side deck plate that covered up a whole created to patch the hole has been mostly drained. You may recall that we pried it open and found it full of water. We probably took 6 to 8 gallons out of that section. Also, we have been steadily draining bits of water from the bills under the cockpit. The concerning part is that we drain them almost empty, and they trickle back to a removable amount, in a relatively short period of time. So, we are keeping all the deck plates open, in what we imagine is a futile attempt to dry things out.

How can we determine if there is water in any other spaces under the deck? If they're all sealed and filled with Styrofoam, how does running air from the bow to the stern help?

Next, uncovered a big issue with the engine. Need guidance on how to proceed with diagnosis.

So you don't have to read up... The engine on the boat is a 2007 Mercury OptiMax 225XL. the only back story we have on the engine is that it may have sat in the yard for up to five years. We did the basics: new oil, new gas, new plugs, new tracker valve, compressions, air pressure. When all stable, the engine started and ran, on the muffs. When we went to dunk the boat it wouldn't make enough power to get up on plane. Got to 3300 RPMs on a 15 P prop and would only barely push about wave out of the way. It seemed to idle evenly for as long as we wanted it to. we been noodling around among our own quasi-experts and getting way too many suggestions. Have started to read many of the things here and I'm very impressed with what I've come across.

Based on some of the suggestions, we ran the engine and pulled the injector plugs and spark plug covers one by one. for all three cylinders on the port side, when the injector plug is pulled, nothing happens. Engine continues to run, at idle, exactly the same. The same thing happens when we pull the spark plug covers. As we pull the spark plugs out, we could see sparks jumping out of the cover seeking ground (Not sure if that's supposed to happen either). In the first 10 minutes of running, any injector plug or spark plug cover pulled, on the starboard side, would stall the engine. After it warmed up, pulling either, on one cylinder, would simply cause the engine to run rough. Seems to us that all three cylinders on the starboard side are not working.

What's the checklist to determine why? Where we begin? Remember that this engine may have been sitting for up to five years.

Any help would be greatly appreciated.
 
I owned a Mercury about 13 years ago, back then certain cylinders would shut down at idle it was the way they were designed if you pulled the plug wires off on the starboard side and engine stumbled that means those are working correctly. You may want to check and see if that engine had the cylinder shut down option

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Sounds like Briand31 is onto something promising. If you have access to a point and shoot laser temp sensor, check the temp around each spark plug with the engine running, to see which ones are firing or not.
 
PKS1801":1xppyka6 said:
Sounds like Briand31 is onto something promising. If you have access to a point and shoot laser temp sensor, check the temp around each spark plug with the engine running, to see which ones are firing or not.

good idea. Will do. We’ve also managed to confirm that it is the whole port fuel rail. Pulling any wire (air, fuel, spark) on any cylinder yields no change in idle. Any starboard plug pulled and she stumbles and almost stalls.

Stumped


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Thanks for keeping an eye on us. We followed the advice, separated out each issue that attack them methodically and we've made progress. Still problems. It seems, though, that the problems are getting smaller.

We'll skip all the small things we've found (like the belt tensioner that wasn't tightened down, duh) We had the Direct and fuel injectors done very quickly and competently by a Merc dealership, in Bayville New Jersey. They found two clogged direct injectors. We also bought the Mercury Vessel View. A great investment. We are now getting all of the codes for $280 and looking at RPMs on our phones. After much fussing and fiberglassing, we managed to finally dunk the boat today. The injectors and other things seem to make a big difference. The boat came out of the plow and almost up to full plane. We have two recurrent codes: "water in fuel" and "critical oil level low". These codes restricted the RPMs to 4850, so we still don't have a good idea of how well the engine it's making power. Will have to attack these two. Any advice greatly appreciated.
 
Install 2 micron racor fuel water filter with clear inspection bowl to check for water. I would pump out all fuel, replace pickups and inspect fuel gauge or if a good company could perform the pump out fuel and check for water. Some point you need to know tank condition maybe a pressure check by a reputable firm to scope it. I don’t think bc the tests does not check the foam side. Were you able to dry tank coffin?. The foam will absorb a lot of water and tough to dry out and times a lot of fan time. I hope it is not bad and all water can be removed.
 
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