Repower SeaRay 310DA 2x 7.4MPI bravo 3 to 2x mercruiser D4.3L D-tronic bravo 3

[stephane]

Repower SeaRay 310DA 2x 7.4MPI bravo 3 to 2x mercruiser D4.2L D-tronic bravo 3

Here it is. I have a very good deal for 2x mercruiser D4.2L D-tronic 250HP bravo 3 2003 with 150 hour they comme complete with electronique drive bravo 3 X diesel, prop,........ (so far I dont know the ratio of the drive is it expensive to change it?)
from another repower boat. The guy need to sell them fast

Im wondering before to go further if I could do someting like this and wath should I be aware of any info or tip is very welcom

So Far I found those info

-I now have a Bravo 3 2.0 ratio with 24 pitch and cruise at 3200 RPM wondering wath drive ration should I use

Find my boat was available with the same engine mercruiser D4.3L but 225 HP so 25 HP less

I call searay dealer they give me the ratio pitch for my boat, 1998 they where using 2.0:1 and 26 pitch for the D4.3L D-tronic 225 HP. Wondering if it will be the same for the D4.3L D-tronic 250 HP. RPM difference between both engine are 200

Also found on sea ray 310 manual from 1999 to 2002 they use ration for 1.81:1 and 22 pitch for the D4.3L D-tronic 225 HP

PS sorry im french native so my english is a bit limited
Stephan

 

[stephane]

My gauge panel seem to be the exact same even tach have same model number
only missing some LED to indicate, preheat, coolant temp, batery, preheat, engine check

Also from the manual I dont see any fuel return on the gas tank anyone could confirm me this as searay seem to only have one model of tank


PS sorry im french native so my english is a bit limited
Stephan

 

[fc3]

That's not a common engine in the US. Not sure if you will find anyone with much experience with it.

Best regards,
Frank

 

[stephane]

Thank you frank yeah I know it is more common in europe those engine came from guadeloup they have been install on a old wood boat the guy came here with it but the wood was not good so they trow the boat


After looking at searay web site for my boat they seem to have change the ration stern prop almost every years and make me realy confuse can someone explane me a bit how ratio ration work. from my understanding 2.0 to 1.8 is 10% RPM i am right? and
how much is a prop change from 22 to 24

1998: ratio for 2.0:1 and 26 pitch for the D4.3L D-tronic 225 HP
1999: ratio for 1.81:1 and 26 pitch for the D4.3L D-tronic 225 HP
2000: ratio for 1.81:1 and 26 pitch for the D4.3L D-tronic 225 HP
2001: ratio for 1.81:1 and 22 pitch for the D4.3L D-tronic 225 HP

 

[stephane]

bayliner 320 2008 about same beam same weight as mine use

2008: ratio for 1.81:1 and 24 pitch for the D4.3L D-tronic 275 HP

will do some more reasearch tonith about balynner older model with the 250HP maybe it will help

 

[fc3]

1.8 is 10% less than 2.0, but 2.0 is not 10% more than 1.8. Just divide engine RPM by the ratio to get propeller RPM. IE 2000 RPM divided by 2.0 is 1000 rpm at the prop. 2000 RPM divided by 1.8 is 1111 RPM. Wild guess, it's either a 24 or 26 pitch propeller.

 

[stephane]

Ok Today I pull the trigger and buy the kit will get delivery next week and will begin to install everiting in a month or so as soon we could get acces to the boat im in Quebec so we still have snow over here

The kit come with 2 bravo 3 1:1.81 and 24 pitch prop I also have
a set of 26,24 and 2x bravo 3 1:2.0 from my oder boat

the kit also comme with a MASE 4.0 generator


I cant wait!!!

 

[keokie]

Can't wait to hear the results. Please include pictures.

 

[dpmulvey]

Another fellow on this site just finished repowering a Sea Ray from petrol to diesel. I can't recall if he was from Britain or Turkey. Someone here may remember his name an put you in contact. I cannot recall his name.

You got a great deal on the package. You could part it out and more than double your money.

Good luck.

 

[stephane]

yes the price was amazing the guy pay 90k can in 2002 for the engine + gen set. and only put 150 houre on it.

Get the best of both worlds in one powerful package with the D4.2L D-Tronic. It combines the quiet, smoke-free, smooth performance of a traditional gasoline engine with the power and durability of a diesel. For pleasure or light commercial applications, in a new boat or for repower, the D4.2L D-Tronic is an excellent choice.

Diesel - D4.2L D-Tronic

D4.2L D-Tronic Specifications

Propshaft HP (Pleasure): 225 (168 kW)
Crankshaft HP: 250 (187 kW)
Propshaft HP (Light Commercial): 240 (179 kW)
Displacement (Liter/CID): 4.2/254
Cylinders: Inline-6
Bore & Stroke (in/mm): 3.70 x 3.94/94 x 100
Compression Ratio: 16.5:1
Fuel System: Direct Injected
Full Throttle RPM Range: 3600-3800
Alternator: 65/917
Length (in/cm): 50/127
Width (in/cm): 30/77
Height (in/cm): 21/54
Weight (lbs/kg) - Bravo Three: 1296/588
Transmission Ratios Bravo Three 1: 1.81

Standard Features

Aftercooler
Audio warning system
Closed-cooling
Remote oil filter
Turbocharger
Waste gate
Vacuum pump system (kit)
Water/Fuel separator
5" risers (kit)
Boating Benefits

A direct-injected electronic fuel system that analyzes throttle position, turbo-boost pressure, speed, injection timing, and fuel temperature for optimum performance in all boating conditions.
A microprocessor electronic control unit linked to eight sensors that constantly monitors all operating conditions.
An advanced closed-cooling system and ceramic-coated exhaust components for durability and corrosion resistance.
Turbocharged and intercooled for quick response and superior performance.
Virtually smoke-free performance that meets all current emissions standards (SAV1).
Audio alarm protection for engine and drive unit.
Remote oil filter for easy access.
Hydraulic lifters and constant-tension head bolts for durability and less required maintenance.
Exclusive Mercury MerCruiser® service dealer network

******************************************************************************

Generator MASE 3.5 with yanmar engine it is 220 volt 50hz but could be convert in 120 60hz

The MASE 4.0 Generator is designed to operate in the harshness of the marine enviornments. Using the synchronous alternator, the model 3.5 (MASE 4.0) will produce 3.0 KW at 50 Hz and will produce 3.2 KW at 60 Hz.

Mase Generators are second to none in the industry. Complete with sound shield for low noise, the Mase Generators are manufactured exclusively with an Intercooler System designed to keep the alternator at the ideal temperature. Mase is a welcomed addition to any vessel looking for standby power to operate air conditioners, appliances, or other comforts.

PRODUCT SPECIFICATIONS IS 4.0
Engine Yanmar L70AE
Output 6.7 HP
Bore / Stroke mm 3.07 / 2.44
Displacement cm3 296 cc
Cooling Sea Water
Inclination Angle 30 Deg.
Fuel Consumption 1/hr 0.396 gal/Hr
AC Voltage 120-240/60Hz
DC Voltage 12V / 10 Amp
Max. Power Output 3.2 kW
Cont. Power Output 2.9 kW
Noise Emission at 7m 56 dBA

 

[Scupper Guppy]

Wow! Those D4.3 drives weigh 1300lbs each, and you're putting a pair of them in your 310. Can you say 'squat'?

Did you look at the spec sheet where your 4.0 Mase only puts out 2.9kw continuous? That's only 24 amps of power. Looks like you'll need a fuel pickup & return for that, too.

 

[stephane]

My boat is MPI and already have return. 3000 watt is more than enought for my need I was using a honda 2000 before and could not be happier.

1300lbs weigh is with the stern drive they weigh about the same +-100 than my 7.3. also with the saving on gaz around 50%+ my tank is 200 gallon about 2000 pound I will fill it 1/2 an cary 1000 pound less

 

[stephane]

I have been very busy but here are some update

Pickup up of the engine

I put the engine inside my van to bring it home

I bring the 2 engine 2 stern drive generator and gimball all at once the van was full load

full loaded and ready to go

here is me and Michel my friend in is shop ready to do the job

remove the 7.4

The diesel engine are longer so we have to cut the front support foward them 6 inch

Here was the surprise searay have modify originaly the boat to fit the 7.4 as they
where to large they cut a part of the side beam but they have so badly do the job water
have found is way under the side beam and it was about to be very badly damage
we now have to remove all fiberglall down to the wood let it dry and start over with new
fiberglass

 

[douglee25]

Looks like you've been busy! Keep us posted. Looks good.

Doug

 

[stephane]

more and more fiberglass there was some crack I deceide to repair

we have now dry the wet beam opefully the wood was still in good shape we are now ready to seal it back with fiberglass

here we could see the engine suport have been cut to moove them foward

I buy the arness converter from 21 deutch to 9 pin quicksilver so it will save me
to rewired the entire dashboard

The new arness have only 9 pin so some wire are missing I have to do some electrical
change so LED light and alarm for oil temp,engine temp and charging will be connected together on the original boat alarm in case of and alarm I will have to look at the gauge to know wath wrong. now I will only have to add check engine LED and preheat engine

 

[stephane]

Engine was rust so we sandblast engine and repaint it all. Also remove the vibration demper to locktite the pulley nut as they are known to loose and do damage with time. We try to start the beast but as a surprise both starter was damage by water so I send it rebuilt and hopefully we will be able to start the engine next week I will also send both alternator rebuilt just in case.

 

[SeaHarley]

I love the fack that you are thinking outside the box and doing something you feel is better for you in your situation in Canada.
Nice job!

 

[Thomas Molin]

Hi Stephane,

I might be interested in buying your 7,4 MPI if they are in good shape and the price is affordable. Please send me an e-mail if they are for sale. tm@sgzetterqvist.se

Thomas

 

[tobnpr]

Tight work. Do the new drives line up with the original transom cutouts with the new engines, or do you need to fill the old holes and cut new ones?

I am amazed looking at the first picture with the big blocks that SR had the balls to put engines that close together. Ridiculous- it doesn't look like you could even fit your hand in between them, much less a wrench. You'd have to pull an engine just to do any work on the inboard side of them...

Does the new power leave you with any more room?

 

[stephane]

Yes the 7.4 was a way to wide to put there, I cannot acces between, side or back of the engine my hand could not pass between the manifolfd and cannot grease the power stering or the bell housing. Searay have made a mess with those engine in this boat they have to cut the side beam and they do a very bad job. I could not beleive my eyes when I remove the engine and see the mess

The new engine will be, I hope way better as they are less wide but 12 inch longer. They are not in yet as I did not finish the fiber glass. From my mesure the transmom is the same only the front engine suport need to be change six inch in front and 1 inch lower so I cut fiberglass support and will glue it in the right spot