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Re: 275 and 302 mid cabin questions
I noticed that their is a false bottom under the engine and a 1 inch gap between that and the hull. Seems like a decent amount of water could be sitting there before it was deep enough to hit the bilge pump. Anyone come up with any solutions for this? or is it just how it is. I'm thinking about dumping a bunch of simple green in their with some hot water and taking it for a ride to slosh things around a bit just to make sure its semi clean.
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Re: 275 and 302 mid cabin questions
Does the service manual area on the forums have all the documentation for the 302's?
Wiring diagrams etc...? |
Re: 275 and 302 mid cabin questions
A false bottom? My 275 doesn't have this under the engine. Mine does have a little wall that the pump is mounted to and that will hold a little tiny bit of water that comes out of the hole from the front of the boat. Is that it?
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Re: 275 and 302 mid cabin questions
Nope, under the motor is gel coated fiberglass which has a hole near the rear towards the transom. This hole leads to a 1 inch cavity that then leads to the transom plug. From what it looks like the entire floor under the motor is suspended about a inch from the bottom of the hull. With the only access being via the transom plug or the other 1 inch hole.
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Re: 275 and 302 mid cabin questions
I've been reading a bit on the forums and it seems like their is a large difference between a few boats as far as top speed. I'm wondering if some folks have some water trapped. Honestly if i didn't have the motor out right now I probably would have never noticed. You'd never see it. I suspect its made the way to allow water from the bow or mid cabin area to make its way to the transom drain. The only problem is if that gets plugged up with leaves or whatever you could be running around with who knows how many gallons of water trapped. The reason it has me thinking is that I just towed the boat 1300 miles and just about every time I stopped for gas I still had water draining from the transom.
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Re: 275 and 302 mid cabin questions
Wow, that is different. On mine, the water from the bow or mid cabin is funneled to the middle of the boat and then there is a 2" hole on the forward engine room bulkhead that opens up to the engine room, and is wide open to the drain plug. I agree...that could get clogged, but on the flip side it is a benefit. From when I had my hatch open for awhile working over the weekend, I get leaves and the occasional dropped wire connector or chunk of electrical tape under the engine. That would clog up my drain hole if not fished out(which I do, but it sucks to do it!). But with your design, these items would not clog your drain hole, right?
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Re: 275 and 302 mid cabin questions
That is an odd setup. Mine is a 1999 and has the same configuration as csterners, so I'm fairly certain I'm not getting water trapped anywhere. As far as your top speed question; I have a 502 and on FLAT water, with 1/4 tank of fuel, and 2 of us on the boat I have hit 59 mph.
Biggest issue I have had with my boat so far is a damn lack of cupholders -- where were Mariah's engineers on that one??? :shakehead: Seriously though, this will be my fourth Summer on the water with it and the only real issues I've had have been the internal water pump needing to be replaced -- very common -- and some hairline cracks developing around the bow where the previous owner had stored the anchor and had it bouncing all around. I also replaced the bilge pump last Summer after the plastic housing broke. That was a total ***** to do. My advice to you would be to replace yours (they're fairly cheap) while your motor is out. You (and your knuckles, forearms, etc...) will be glad you did. I also upgraded to a flatscreen in the mid-cabin last Summer. Welcome to MOC, man. You are gonna love your boat. |
Re: 275 and 302 mid cabin questions
Ok so I have the same water issue I was thinking I must have some thru the transom holes letting in water but ever since I have owned it every time I pull the plug at the ramp each day of use I get 3-5 Gals of water but the engine area is dry so I must have the same set up but with there only being an 1" or so under the 502 I can't see the hole your talking about. I just keep the plug out till I'm on the ramp each time to not let water hold in there. Do you have a pic with the engine out? Or maybe Oregondune may have a pic? But we both are 302... I'll follow this thread maybe I can fix mine if you find and answer. Best of luck
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Re: 275 and 302 mid cabin questions
I'll try and get a pic for you later tonight or tomorrow. It more or less look like a 1 inch bathtub drain that leads down a inch or so to the cavity. I bet if you shoved a coat hanger in a few feet you will not see it under the motor. I had a 32ft scarab with something similar. except they lined theirs with a pvc pipe the length of the boat. As you can imagine if the water in the middle of the boat was trapped. I'm thinking the end of this void is probably under the mid cabin floor? I noticed that its screwed down but havent looked yet. I'd be curious if anyone else has taken up that section of flooring.
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Re: 275 and 302 mid cabin questions
this is true. the 302's have a "hull in a hull" design.
In my boat, I cut the inner engine bay floor out neatly with a sheet rock saw about 6" x 8" and mounted my bilge pump directly the bottom hull. works perfectly and i get maybe a cup or two of water at the end of the day. The inner hull already had a open area at the very rear of it so that any water or fluids that do end up in the inner hull immediately drain to the outer hull and the drain plug area is totally exposed so you can run the oil pan drain hose out it. Simple fix and works great. Not to mention, it now lowers the over height of the bilge pump under the oil pan, so a person could run a deeper/bigger pan or even a bigger/high volume bilge pump without any interference. |
Re: 275 and 302 mid cabin questions
Well......I took the floor up in the mid cabin and yup... Full of water... Spent a few hours trying to get it to drain and its stopping at the bulk head right behind the gas tank. Air goes through etc... Anyone had the tank out? I'm curious what the drain hole looks like under the tank. The entire thing is full of water. Must be 20 gallons at least. Pulling the tank after I get the gas out.
I'll get pics once the tank is out. |
Re: 275 and 302 mid cabin questions
when i pulled my motor, i pull a 2" hole saw hole thru that bulk head and now I have no more drainage issues. I slid a piece of 1/2" board between the tank and the rear bulk head so to make sure I didnt puncture the tank. The water flows like a mad man now.
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Re: 275 and 302 mid cabin questions
here's what it looked like before I started pressure washing.
http://i1197.photobucket.com/albums/...17D220C752.jpg |
Re: 275 and 302 mid cabin questions
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Re: 275 and 302 mid cabin questions
Wow! I wonder why they made such a change between the 302 and the 275...
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Re: 275 and 302 mid cabin questions
Who knows
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Re: 275 and 302 mid cabin questions
Same problem I have. Did that bulkhead have a drain hole to start with?
Taking tank out tomorrow. Unless it some how fixed itself over night :) |
Re: 275 and 302 mid cabin questions
I think the drain was beneath the inner hull. I fixed it though
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Re: 275 and 302 mid cabin questions
Fixed it last night. I was almost to the point of pulling the tank. For the hell of it I used a flashlight to look up the transom plug and saw the drain hose from under the gas tank. Was about 6-7 inches in on the left. Coat hanger and 10 seconds problem was solved. It's only a 1 inch hose. Plugs up easy.
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Re: 275 and 302 mid cabin questions
Anyone know how to reset the electronic keypad? I have the manual for it, but it says to use the emergency override code.... well if i had that I wouldn't need to reset the code LOL.
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Re: 275 and 302 mid cabin questions
If you can get access to the control box under your dash , sometimes there is a sticker on it with the code. If not, try "0000". I tried to find my emergency override code, and even called Mercruiser/Quicksilver as the manual states to do. They had no idea and offered no support since the product was discontinued years ago.
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Re: 275 and 302 mid cabin questions
That's good to know there is so much support for the keyless entry!
On a positive note, I love it! Just hope I never needs to reset or seek help. Forgot the key at the house on day so I downloaded the file from MOC and we were boating without a key in no time! Sent from my DROID RAZR HD using Tapatalk 2 |
Re: 275 and 302 mid cabin questions
I'll give that a shot. Should be able to get my hands on the back of it to check for a code.
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Re: 275 and 302 mid cabin questions
Quote:
Sceptre115- If you can't get it to work, you might be able to just swap it with another one. Occasionally you can find brand new units on ebay, usually from dealers clearing out their back stock rooms, or people that stumble upon them somehow. |
Re: 275 and 302 mid cabin questions
Thanks, thats good to know !!
on a side note, those guys running a 502 in their Z302's. What size props are yall running? and whats your RPM's? |
Re: 275 and 302 mid cabin questions
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Re: 275 and 302 mid cabin questions
Mine will be a very healthy 454, 2:1 bravo 3 running 28p props, 5500 max rpms
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Re: 275 and 302 mid cabin questions
Getting ready for the first run tonight. New motor is in and running well. Rebuilt 502 with a few little extra goodies. Trying a 26 inch prop.
Anything over 50 and I'll be happy. |
Re: 275 and 302 mid cabin questions
Z302 w/ 502. Running a 24p Prop, running 5200 RPM, rev limiter kicks in at 5300.
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Re: 275 and 302 mid cabin questions
so far so good, haven't run it very hard yet. looks to be close to 100 rpm per mph. 3000 rpm is about 31 ish on gps.
I've gotten it up to 4500 rpm for some short bursts. we will see how easy it hits max RPM's. I'm thinking I don't want it going over 5100. I have a lot of throttle left running at 4500. Very nice riding boat. |
Re: 275 and 302 mid cabin questions
Sceptre,
I realize that you've done a motor swap, and I'm still running my factory 502, but I will tell you that at 1/2 throttle (or a touch over) I am running WAY more than 1/2 max RPMs. I guess what I'm saying is that at 4500, I also have a ton of throttle left -- but it doesn't translate into all that much. Glad to hear you're out on the water. Enjoy. |
Re: 275 and 302 mid cabin questions
Well its freezing in NY, I'm tired of the cold !! it's sunny out today and I'm thinking boating in a few months.
So all in all last summer went great. Motor ran solid all summer. I probably put 60 hours on it. I ended up with a quadrajet carb for the time being, thinking about replacing that this spring. Now that I have some hours on it and I know it runs well I'm going to tinker with it a bit. Not sure the carb I'm running has enough flow to really open the motor. I have a friend that likes playing with those carbs so im going to let him have some time with it before I make a final decision to switch to something else. Best performance on calm water was 4600-4700 ish rpms and 53 mph on the gps. 26 inch mirage 3 blade. I have a 28 inch prop im going to try If I can get her pushing the 5k rpm mark im going to throw that on and go from there. And i realize she isnt a rocket by any stretch, but it would be nice to be around the 60 mph mark. |
Re: 275 and 302 mid cabin questions
Add lots of money:yes_grin:
7 mph is a lot to shoot for without spending the bucks , but hey , we all want to go faster!:D Keep us updated on your progress. It will be interesting to see what kind of improvement you can coax from her. |
Re: 275 and 302 mid cabin questions
My lake has a speed limit of 40!! I guess any speed above that doesn't do me any good. . . Or does it!?
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Re: 275 and 302 mid cabin questions
Carb rebuild plus a few tweaks netted me another 300ish rpm and I moved up to a 28 inch prop. I must have been starvin her last year :( On the down side, I need more octane, 11:1 ratio may have been a poor choice lol May have to retard the timing. But honestly I don't run WOT often so I may just run it for awhile.
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Re: 275 and 302 mid cabin questions
I have one of the 2002 24' mid cab bowriders with the volvo big block, inboard-outboard drive system with 2 props counter rotateing, I get just over 400hp and on a smooth day with the wind at my back I can get her up to about 65mph. She is loaded with every option, and yes, very very few of them where made. But I am looking to sell her, she has been kept in a high and dry since the day I bought her, heated and cooled wharehouse all year round. She looks like she is only a year old because we dont use it much and its never been exposed to the elements. I have been asking 35k but wouldent go any less than 30, shes worth it. Let me know if you want pics or if your interested in her, [email protected] / also the cabin is plenty big to sleep 2 people, I am 6' and my gf is 5' and I have plenty of room to sleep. It's a good stable ride and its nice having the best of both worlds a cabin but with an open bow and an open back. Can't beat it!
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Re: 275 and 302 mid cabin questions
Enterpriz, put up a post in our Mariah Boats For Sale forum, and make sure and add some pics! You'll get a lot more visibility there, and maybe find the perfect buyer! :wink_thumbup:
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Re: 275 and 302 mid cabin questions
Love to see pics
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