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Old 09-17-2013, 01:53 AM   #1
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Default Anyone pull engines out of Maxum 3000SCR?

End of season is here, These little 4.3's are too underpowered for me so I am gonna repower her this winter. Has anyone done theres yet? I am just wondering how you guys got the engines by the Arch or if you took it off and where you lifted on the engines to pull them up-forward-up
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Old 09-17-2013, 04:59 PM   #2
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While I haven't worked on a 3000 SCR it won't stop me from putting my 2 cents in here as you can tell I seem to always hav something to say

If these are carb'ed engines I would use a lifting bracked that bolts to the intake in place of the carb, this should have the chain clear of the engine compartment opening. Then raise the engines. You will either need to move the boat (trailer ?) or hoist to get the engines to clear the opening. I have seen the boat forklift used for this. The key with the arch is seting up so the bottom of the engine to top of hoist is less than the space of bottom of arch to top of transom. Easy for me to say but would need to be there to figure it out.

good luck.
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Old 09-17-2013, 05:07 PM   #3
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you could probably sell your boat, and but a better one with the engines you want, cheaper then putting new engines, drives, probs, and engine mounts.

I'd look had at that, even if you lose money on your boat, you will still have less money into it.

The 4.3 are not very good in the 2800 scr.
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Old 09-17-2013, 05:23 PM   #4
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I did mine in a 2800, the method is the same. You don't need to remove the arch at all. They will come out in front of the arch. You're going to need a crane or travel lift. You'll raise it out of the engine compartment then move it forward over the rear facing seat. You might need to come up, then forward, then up then forward several times. I got a 454 out and a 496 in this way. A couple of 4.3's will be a piece of cake.

However, I agree. If you have two functioning motors and are dissatisfied, seel the boat and buy a new one. That will be far less costly than what you are proposing. only repower if they are dead.
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Old 09-18-2013, 02:13 PM   #5
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Much of the economics of this depends on what you have access to. If you have access to inexpensive and complete engines - including the their exhaust systems, it might make economic sense to replace them. Keep in mind, though, that the drives themselves might also need to be replaced to achieve the correct gear ratio. Research 3000's with V8's of the same HP rating you are considering to see what OD gear ratios they use.
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Old 10-18-2013, 12:07 AM   #6
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Wife likes the boat so it is staying, I bought a pair of 425HP 496's and Bravo III drives, Hopefully this improves performance a bit, should make for a good winter project
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Old 10-18-2013, 01:48 AM   #7
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WOW 4.3 to 496's. What were he 4.3 rae at 190 or 220 HP? Then going to 425 HP each for a total of 850HP! Did you look into what the boats max HP was rated for? Also did you verify these will fit side by side and line up with the transom plates?

Major performance improvement, also will drink more fuel;-)
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Old 10-18-2013, 02:05 AM   #8
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I had the 190HP 4.3's so yeah one engine has more HP then both. I just liked how the 8.1's came fuel injected and FWC also. I doubt anywhere will list the max HP rating of the boat, I will be looking at my transom when I pull them out and probably pulling my Gimble housings to reseal everything and make sure the wood is strong, I will put a penetrating epoxy through all the holes and stuff if it is solid, Everything SHOULD be fine back there. Transom plates they will bolt right too the bell housings If I measured correctly, on paper these motors will fit with plenty of room BUT they will be close together. The engine mounts are only a few inches forward, I may or may not glass in some extra wood to give it more strength, I am not going to be doing hole shots or anything like that, heck probably not even WOT more then a few times but I think with the Torque of these engines and the Bravo III's I think I should be able to stay on plane at a lower RPM also. I know these engines will use a TON more fuel at WOT, a little more then double, but I am thinking they should only use slightly more fuel then my 4.3's on plane but being able to cruise faster (Just looking at similar weight boat specs)

The drives I picked up have 26P stainless props on them, That will be my starting point.
I am debating on using the outdrive water intake or I noticed a lot of people that do the 8.1 Retro's they put Seacocks on the bottom of the hull.

If I don't spend too much more then I already have on other supplies I may toss a bow thruster and windlass in this winter also.
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Old 10-18-2013, 02:17 AM   #9
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4.3 Drawings:

8.1 HO Drawings:


My boat, Don't mind the scum line, Providence water will do this 20minutes after washing it:
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Old 10-18-2013, 12:29 PM   #10
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Ok so my questions were basically did you do your homework and the answer is appears to be yes.

Some boat manufactures list max HP for each model but I have not seen that for maxum yet once still exists for the design. Do you know what the largest engine package offered was and how does your plan stack up to it? Iagree if you are not using tefull potential of thenew engines then you should be ok.

Nice looking boat scum line and all:-) The extended swim platform is really nice
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