The Hull Truth - Boating and Fishing Forum

Go Back   The Hull Truth - Boating and Fishing Forum > BOATING FORUMS > The Boating Forum
Search

Notices

Random Quote: Scars are tatoos with better stories.
Reply
 
Thread Tools Search this Thread
Old 04-08-2011, 11:20 PM
  #1    
Junior Member
 
Join Date: Apr 2011
Posts: 11
Default mercruiser diesel

Looking at getting a boat that has a mercruiser 4.2 diesel with bravo 2 drive. Any and all feedback good or bad would be greatly appreciated. How do they compare to Volvos??


Thanks in advance
noquestion is offline   Reply With Quote
Old 04-09-2011, 03:10 AM
  #2    
Senior Member
 
Join Date: Jan 2002
Posts: 1,008
Default

That engine has a very poor reputation and virtually no parts and service support from Cummins Marcruiser since it was just a rebadged Italian VM Motori base engine. Also personally I am not a fan of Bravo drives hooked to Diesels as they do not handle the torque.

As for Volvos, the drives used on their Diesels are much better suited and generally do well. The engines vary quite a bit depending upon the model. The newer D series electronic common rail motors have been generally doing well compared to some of the older 40 series. Parts are notoriously expensive for Volvos but this is true for most Diesels except for Cummins engines which have a huge installed base in the USA.
ClassicGuy is offline   Reply With Quote
 
Old 04-09-2011, 09:57 AM
  #3    
Junior Member
 
Join Date: Apr 2011
Posts: 11
Default

anybody have anything positive to say?????
noquestion is offline   Reply With Quote
Old 04-09-2011, 10:25 AM
  #4    
Senior Member
 
Join Date: Mar 2010
Location: BAHAMAS / FLORIDA
Posts: 252
Default

I had some friends that had Panga boats with that engine and eventually cut the transom down and put on a outboard.
Sea Cat is offline   Reply With Quote
Old 04-09-2011, 10:46 AM
  #5    
Senior MemberCaptains Club Member
 
Join Date: Apr 2003
Location: Norwell,
Posts: 386
Default

I had a friend with a mid-90's 23' Boston Whaler Conquest with a 250hp rated 4.2 MerCruiser diesel/Bravo 3. The engine installation was a poor design and allowed salt air/water to enter the engine compartment and drop right onto the air intake/turbocharger. After replacing a seized turbo and sorting out a few other issues, it ran well a fairly smoothly. I believe it is a common-rail motor and was surprised the sound levels were not much worse than a gas V-8. It was also a very economical set-up in terms of fuel usage.

ClassicGuy is correct, it is the VM Motori block marinized by then Mercruiser and now MerCruiser/Cummins. Parts were hard to come by and finding a mechanic who new anything about it was even harder. I would have an engine survey performed, check maintenance records, and check for availability of a service shop familiar with the engine. I would also make sure the Bravo 2 outdrive is the X-model designed for use with this diesel

Good luck with the deal.
water rat is offline   Reply With Quote
Old 04-09-2011, 11:32 AM
  #6    
Senior Member
 
Join Date: Aug 2010
Location: Flensburg, Germany
Posts: 1,876
Send a message via ICQ to divefreak Send a message via Skype™ to divefreak
Default

Quote:
Originally Posted by ClassicGuy View Post
That engine has a very poor reputation and virtually no parts and service support from Cummins Marcruiser since it was just a rebadged Italian VM Motori base engine. Also personally I am not a fan of Bravo drives hooked to Diesels as they do not handle the torque.
calc the torque of a 8.2l Big Block hooked to a Bravo and calc the torque of the 4.2...


I bet you´ll be surprised...

The VM Enignes need a bit maintenace and a gauge for boost pressure to keep an eye on the pressure relief valve...

Otherwise bullet proof engines.
__________________
René

Sea Swirl Striper 2150WA (1995) CMD QSD 2.8-230/Bravo3 (2008)
divefreak is offline   Reply With Quote
Old 04-09-2011, 01:20 PM
  #7    
Senior MemberCaptains Club Member
 
Join Date: Apr 2004
Location: Portsmouth RI
Posts: 4,139
Default

Quote:
Originally Posted by noquestion View Post
anybody have anything positive to say?????
nope
__________________

28 Carolina Classic
Yanmar 300's
Sleeper is offline   Reply With Quote
Old 04-09-2011, 03:13 PM
  #8    
Senior Member
 
Join Date: Aug 2009
Posts: 187
Default

What kind of boat are you looking at? whats the weight? lots of underpowered outdrive boats out there and the motor wont last very long espeacially the drive. I wouldn't go near a bravo 2 drive. The Volvo d series and DPH drives are good and just got better this year.
captainmike73 is offline   Reply With Quote
Old 04-09-2011, 06:53 PM
  #9    
Junior Member
 
Join Date: Apr 2011
Posts: 11
Default

Lookin at a boat that weighs somewhere around 7000 lbs loaded, I have a pretty good idea about how the drives work or don't in comparison to a Volvo. My understanding is that there are some issues with the motor! Are they internal or external probes or maintenance issue problems. Years ago guys said to stay away from Volvos as well!!
noquestion is offline   Reply With Quote
Old 04-09-2011, 10:22 PM
  #10    
Senior Member
 
Join Date: Aug 2010
Location: Flensburg, Germany
Posts: 1,876
Send a message via ICQ to divefreak Send a message via Skype™ to divefreak
Default

Quote:
Originally Posted by captainmike73 View Post
What kind of boat are you looking at? whats the weight? lots of underpowered outdrive boats out there and the motor wont last very long espeacially the drive. I wouldn't go near a bravo 2 drive. The Volvo d series and DPH drives are good and just got better this year.
the last good series of Volvo Drives were the 290 to DP-E and the DPS until the curent DPS-A

Lots of trouble with the current drives with the steering cylinders and trimlines etc...
__________________
René

Sea Swirl Striper 2150WA (1995) CMD QSD 2.8-230/Bravo3 (2008)
divefreak is offline   Reply With Quote
Old 04-10-2011, 02:23 AM
  #11    
Senior Member
 
Join Date: Jan 2002
Posts: 1,008
Default

Quote:
Originally Posted by noquestion View Post
Lookin at a boat that weighs somewhere around 7000 lbs loaded, I have a pretty good idea about how the drives work or don't in comparison to a Volvo. My understanding is that there are some issues with the motor! Are they internal or external probes or maintenance issue problems. Years ago guys said to stay away from Volvos as well!!
Although I have a twin Diesel boat myself, I don't really understand why you would incur the major additional purchase and maintenance cost for a single Diesel outdrive on a boat that size and displacement. Unless you are in Europe paying $9/gallon for fuel or run 800 hours per year, it is hard to see how it could ever make sense. A modern four stroke outboard (or two) takes up much less interior space and weighs so much less that the fuel economy would be quite close -- not to mention much quieter, cheaper and easier to maintain.

As for the Mercruiser 4.2, your biggest problem will be finding someone who knows how to maintain and repair it and getting parts without a long wait and lots of expense. It is an orphan product especially in the US market.

While the peak torque of a big block 8.2L gas engine may not be much different than a small high rpm Diesel like the VM, it is delivered at a different point on the rpm curve and gas engines don't impose as much stress on the drive when running in highly variable load conditions such as heading into big waves. That's why a smaller Diesel can tear up an outdrive that would last a long time with a big gas engine.
ClassicGuy is offline   Reply With Quote
Old 04-10-2011, 02:38 AM
  #12    
Member
 
Join Date: Feb 2011
Posts: 34
Default mercruiser diesel

He who plays with the lions balls will be bitten.
obcat is offline   Reply With Quote
Old 10-26-2011, 11:53 AM
  #13    
Junior Member
 
Join Date: Oct 2011
Location: AUCKLAND CITY
Posts: 14
Smile Cummins QSD 4.2 350hp

I have 2 350s in my cat[13.2m & 11 ton loaded].Have been in the water for 18 months now 312 hrs with no dramas.Motors run awsome ,im on Bravo 3 legs wich give great control underway & when docking.I cruise @ 20-21 knots @ between2600 & 2800rpms use between 55-65litres/hr for both motors depending on tide & wind,Best speed 31.5knots.Mercruiser NZ have been good to deal with,servicing hasnt been an issue either.So only positve stuff to say.
tarikicat is offline   Reply With Quote
Old 10-26-2011, 02:07 PM
  #14    
Senior MemberCaptains Club Member
 
Join Date: Sep 2005
Location: orlando madbeach, fl
Posts: 6,526
Default

Quote:
Originally Posted by tarikicat View Post
I have 2 350s in my cat[13.2m & 11 ton loaded].Have been in the water for 18 months now 312 hrs with no dramas.Motors run awsome ,im on Bravo 3 legs wich give great control underway & when docking.I cruise @ 20-21 knots @ between2600 & 2800rpms use between 55-65litres/hr for both motors depending on tide & wind,Best speed 31.5knots.Mercruiser NZ have been good to deal with,servicing hasnt been an issue either.So only positve stuff to say.
So there you go....buy the boat and move to NZ!
__________________
USCG 100 TON MASTER
Pursuit 2870 CC
Palm Beach 161
1984 Mckee Craft 14'


Sunset on the ICW
Madeira Beach, Fl


"ARRR BOAT" in Hopetown


"Many times life gives you the test, before you learn the lesson!"
signmansez is offline   Reply With Quote
Old 10-26-2011, 08:33 PM
  #15    
Senior Member
 
Join Date: Jun 2005
Location: Mamaroneck, New York
Posts: 425
Default

I have twin 320 hp Cummins Mercruiser diesel QSD 4.2s with Bravo 3 drives on my 2008 Fountain Sportfish Cruiser. Classic Guy is correct. They are VM Motori engines and CMD/ Fountain tricked me into believing I was getting Cummins engines. When I had huge problems my first year, Cummins had no ability to service the engines, no parts, no software and I went nuts. As a lawyer, i had to threaten them and to their credit, CMD stepped up, ultimately replacing my starboard engine and giving me a special extended warranty. Now most of my issues are on the Bravo III side but last summer at the start of our 2 week family boat trip, a stud on one of the engine valve covers sheared off. The VM Motori factory was shut down for vacation. CMD actually bought an engine from a dealer, stripped it down to get a stud, and fixed my engine and later resold the one it cannibalized. But my boat vacation was aborted and it took two weeks to get the stud repair. Having said all this, the engines now have 800 and 875 hours respectively and have been running well. They are very powerful, extremely fuel efficient, give off no fumes, and are fairly quiet. CMD is committed to supporti g them for another ten years.
jillybird is offline   Reply With Quote
Old 10-27-2011, 07:17 AM
  #16    
Senior MemberCaptains Club Member
 
Join Date: Mar 2002
Location:
Posts: 1,760
Default

Bottom line, not a good combination, in addition Cummins and Mercruiser have just re-did the org covering these brands. Check out boatdiesel.com for more details.
marlinmike is offline   Reply With Quote
Old 10-27-2011, 03:38 PM
  #17    
Junior Member
 
Join Date: Feb 2011
Posts: 25
Default

These engines are the greatest!!!!!!!!!!!!!
Just kidding!
Mercruiser support.....(NONE)
Cummins support......(NONE)
Independent shops..... only the hungry ones!
CompressionIgnition is offline   Reply With Quote
Old 10-27-2011, 04:10 PM
  #18    
Junior Member
 
Join Date: Apr 2011
Posts: 5
Default

I've a Chaparral 350 running a pair of this same ES320 Diesels through B3 drives. Been on the water since 2008 with 220 hours. No dramas here in Singapore. Service are great, parts arrival average but overall been top notch engine to me. Does 36 knots WOT
smallann is offline   Reply With Quote
Old 10-27-2011, 08:58 PM
  #19    
Senior Member
 
Join Date: Aug 2010
Location: Flensburg, Germany
Posts: 1,876
Send a message via ICQ to divefreak Send a message via Skype™ to divefreak
Default

Quote:
Originally Posted by CompressionIgnition View Post
These engines are the greatest!!!!!!!!!!!!!
Cheaper to buy, cheaper maintenance, flawles running, little problems, No n+1 version of the eletronics....
__________________
René

Sea Swirl Striper 2150WA (1995) CMD QSD 2.8-230/Bravo3 (2008)
divefreak is offline   Reply With Quote
Old 10-28-2011, 08:19 AM
  #20    
Admirals Club
 
Join Date: Feb 2011
Location: Santa Barbara, CA
Posts: 7
Default

I installed a lot of these engines in the late 90's on oil company sponsored emissions credit swaps. Mostly in boats that were in the 7000-10000 pound range loaded, on Bravo 2 and 3 drives for commercial service. We called them "Bic Lighters" as far as longevity was concerned. However if in a light boat and low horsepower (180-220) they will preform very well if taken care of.

Good luck with support, as no one seems to care even though Cummins Mercrusier Diesel is still shipping the things.

Also a Pyrometer (directly relates to engine load) and a Turbo Boost gauge are essential.
Tizzinadimorte is offline   Reply With Quote
 
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 



©2009 TheHullTruth.com

Powered by vBulletin® Version 3.7.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.2.0