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    8.1 GXI-J Cranks but No Start w/ Diacom Logs

    This isn't so much to chase possible causes because the damage is done, but as the long block gets replaced and parts get taken apart I want to be able to try and understand where the weak point was and what caused this. The bolt definitely snapped. I have found a local repair shop that...
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    8.1 GXI-J Cranks but No Start w/ Diacom Logs

    Could the below series of events be possible? I am not trying to point blame or anything like that, but rather just trying to understand the flow Manifolds/Risers/Exhausts possibly installed improperly or used the wrong gasket Sea water slowly leaks into the engine throughout the season due to...
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    8.1 GXI-J Cranks but No Start w/ Diacom Logs

    I had the manifolds, risers, exhausts changed at the start of the season - if that was done incorrectly could that have been a cause of this?
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    8.1 GXI-J Cranks but No Start w/ Diacom Logs

    One of the techs I spoke with mentioned that he has seen/wouldn't be surprised if the oil cooler failed and that's what caused the water to get into the engine and ultimately hydrolock and snap the head bolt - is that a common cause?
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    8.1 GXI-J Cranks but No Start w/ Diacom Logs

    Yeah it makes it less feasible. The marina said it wouldn't be worth it to do a full swap with all the components that would have to be replaced and the costs associated. They are looking into costs for a new long block as they said it's the best route to go given the circumstances
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    8.1 GXI-J Cranks but No Start w/ Diacom Logs

    I want to explore the Merc options, but I think, or from what some people have told me, is that I would need a special transom assembly as well and then a new outdrive. The $$ may add up a bit too much but I need to explore all avenues at this point
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    8.1 GXI-J Cranks but No Start w/ Diacom Logs

    I am going to be going the route of having the marina do the work, I just don't have the resources, knowledge, or time to do it myself. I think the options are get a new long block and re-use as many accessories as possible, or just go from scratch. Very pricey, but it's cheaper than a new boat
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    8.1 GXI-J Cranks but No Start w/ Diacom Logs

    The few times it started recently, it took very long to even get up to temp which a few of you called out from the Diacom logs, so not even sure that would have made a difference vs just made it worse (even though the damage is likely done) Hoping to get some options from the marinas this week...
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    8.1 GXI-J Cranks but No Start w/ Diacom Logs

    My neighbor had an oil change pump and kit so we attempted to do an oil change today. Since it won't start, we had to do it with the oil cold which obviously is not ideal. If you are squeamish or are anti engine cruelty, look away from these pictures The pump couldn't get any of the oil out...
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    8.1 GXI-J Cranks but No Start w/ Diacom Logs

    Just scheduling, I am in NJ and the Atlantic City in water boat show is this weekend, so they are mostly getting ready for that personnel wise. I didn't think their mechanics had anything to do with that show (just an excuse they're giving it seems), which is part of the push back I am giving...
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    8.1 GXI-J Cranks but No Start w/ Diacom Logs

    I keep getting push backs from the marina so I may need to find someone to come do an oil change in the meantime Outside of the blown head gasket, are there other common areas of failure I should look into?
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    8.1 GXI-J Cranks but No Start w/ Diacom Logs

    I don't have a trailer or access to do that unfortunately, so I will be relying on a local marina hopefully this week - are there any specific things or tests I should ask them to focus on? At this point with these kind of issues I am a bit over my head. Are there other areas of the engine or...
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    8.1 GXI-J Cranks but No Start w/ Diacom Logs

    That would be great news, but if those sensors are caked, wouldn't that mean water is in those areas?
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    8.1 GXI-J Cranks but No Start w/ Diacom Logs

    That's what is confusing to me, the boat has been running amazing up until the recent string of events. Is it possible that the heavy shaking/vibration getting off the sandbar was enough to break the headbolt (which may have already been vulnerable?) - or would something else have caused the...
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    8.1 GXI-J Cranks but No Start w/ Diacom Logs

    I have only owned the boat for 4 years so I am not sure if any work was done by the previous owner, but I would doubt it with the low hours. It is so odd that the engine still starts the first time, but after it won't - Does it get filled with water from running then causing it to not start the...
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    8.1 GXI-J Cranks but No Start w/ Diacom Logs

    As you see in the pics, both sensors were caked with the same milky substance, so does that mean (I think I know the answer) that water got into the crank as well as the cam? Where are the leak points for water to get into these areas? I am trying to understand what "broke" that led to this. You...
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    8.1 GXI-J Cranks but No Start w/ Diacom Logs

    I had the engine oil changed at the start of the season, and the entire manifolds, risers/exhaust setup changed in May where no issues were found. I don't know if the head bolt issue led to leakage since then and the engine was just a ticking time bomb, but it really appears the engine is done...
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    8.1 GXI-J Cranks but No Start w/ Diacom Logs

    Okay well I changed the sensors and pretty much have a whole lot of bad news Attached pics show both sensors and how gunked up they were After changing the sensors, the engine started up the first time as usual, continued to run rough, and once I turned it off and attempted to re-start, it...
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    8.1 GXI-J Cranks but No Start w/ Diacom Logs

    Thanks, I have a CKP and CMP sensor coming hopefully today/tomorrow. For the CKP sensor, are the tolerances super tight where I need to grease it before installing, with oil, fuel, something else? The other sensors I have changed were just screwed in, so just want to make sure this one is done...
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    8.1 GXI-J Cranks but No Start w/ Diacom Logs

    Thanks for that explanation, super helpful to understand the mechanics of it. I should clarify, which is actually confusing, in my dash gauge it reads as "Coolant Temp" but I do have the sea water cooling and not coolant/heat exchanger, apologies if that changes things, but the gauge for some...
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