] ]

 
] ] ]
]
Welcome Guest ]
]
] ]

] ] ]
]
Site Navigation ]
]
] ]

] ] ]
]
Top 10 Recent Posts ]
View Last Post Viking Yachts Links
Last Post By: Viking44
Forum: Viking Yacht

Posted: Today at: 06:32

View Last Post Amerosport 320
Last Post By: Jerry737
Forum: Chris Craft

Posted: April 13 2014 at: 16:00

View Last Post Murray Chris Craft Constellations
Pages 1 2 3 4 ... 149 » 150
Last Post By: David Ross
Forum: Chris Craft

Posted: March 14 2014 at: 17:23

View Last Post Any Uniflite Owners near Berkeley CA???
Last Post By: concordian
Forum: Uniflite

Posted: March 08 2014 at: 02:27

View Last Post Inverter
Last Post By: eshover
Forum: Chris Craft

Posted: February 03 2014 at: 11:32

View Last Post 1963 Constellation 42
Last Post By: eshover
Forum: Chris Craft

Posted: February 03 2014 at: 11:19

View Last Post 2000 Gulfstream 232
Last Post By: DanDDan
Forum: Grady-White

Posted: January 30 2014 at: 11:01

View Last Post Catalina Owners
Pages 1 2 3 4 ... 191 » 192
Last Post By: Happy Hour III
Forum: Chris Craft

Posted: January 18 2014 at: 20:11

View Last Post 50 amp question
Last Post By: Pats2nd Connie
Forum: Chris Craft

Posted: January 13 2014 at: 17:57

View Last Post Leaving boat
Last Post By: Pats2nd Connie
Forum: Chris Craft

Posted: January 13 2014 at: 08:17

]
] ]
   
Sea Ray
 BoatUS Boat Groups/Manufacturer Forums>>Sea Ray
Subject Topic: Merc 470 Post ReplyPost New Topic
 
] ] ]
]
Author
Message Prev Topic | Next Topic 
sloanies2002
"Seaman Recruit"




Joined: July 18 2006
Posts: 2
Posted: July 18 2006 at 13:04 | IP Logged Quote sloanies2002

Recently replaced one of my Merc 470 engines on my 1983 270 Sundancer ... which is the 3RD engine replacement that I know of.  Have heard good and bad things about the 470 engine ... anyone have comments?  Wondering when the other 470 will FAIL.

Thanks



__________________
Jeff
Back to Top Printable version View sloanies2002's Profile Search for other posts by sloanies2002
 
nat goldberg
"Seaman Recruit"




Joined: July 18 2006
Posts: 1
Posted: July 20 2006 at 15:40 | IP Logged Quote nat goldberg

 HAD A PAIR OF 470 S IN MY 1977 SEA RAY FOR APPROX.3000 HRS WIH MINIMAL REPAIRS , BUT THEY WERE GETTING TIRED. I REPLACED THM WITH 3.7 LTR ENGINES WHICH IS THE UPGRADED VERSION. I HAVE ABOUT 800 HRS ON THEM , AND ALSO MINIMAL REPAIRS, AND THEY RUN FINE.
I CANT UNDERSTAND WHY YOU ARE HAVIJNG SO MUCH TROUBLE. MAYBE ITS IN THE MAINTENANCE.
IF YOU WANT TO DISCUSS,IM @ 800-429-2992 9-5/M-F ,OR 818-881-4149 @ HOME.
COOD LUCK
NAT


__________________
gogonat
Back to Top Printable version View nat goldberg's Profile Search for other posts by nat goldberg
 
sloanies2002
"Seaman Recruit"




Joined: July 18 2006
Posts: 2
Posted: July 20 2006 at 15:46 | IP Logged Quote sloanies2002

NAT ... thanks for the reply.  There's actually much bad press on the web about the 470s ... apparently there's a manifold gasket prone to failure which in turn allows coolant to leak into the cylinders and score them.  That's what happened to my engine.  Problem first showed up as very low oil pressure.  Perhaps I'll look into the 3.7Ls.

__________________
Jeff
Back to Top Printable version View sloanies2002's Profile Search for other posts by sloanies2002
 
DocHoliday
"Seaman Recruit"




Joined: August 12 2006
Posts: 4
Posted: August 16 2006 at 04:30 | IP Logged Quote DocHoliday

I had a 1986 19' Sea Ray cuddy with the 470 and I loved that motor. Huge torque, easily pull skiers up with half throttle. It has thousands of hours on it and still running great, the boat is 20 years old this summer and is used regularly and has never had anything but routine maintenance done to it (I had it for 16 years, now owned by a buddy, hope this doesn't jinx him!).

I have heard of the coolant seal issue, in fact when I bought my current boat in '02 (20 bowrider with 250hp 5.0)  the dealer's mechanic seemed suprised I never had this problem with my 470. We debated weather to change the gasket preventively just 'cause it's old, or leave well enough alone...

My understanding is the 470 engine was built because there weren't readily available automotive engines in the 4 liter size range back then. I understand it is aluminum block so closed cooling was required.

The motor was discontinued when similar displacement v-6 blocks became readily available from automotive manufacturers for marinization, and that is what we have today. So it was economics of mass production not equipment problems that did in the 470, or so I'm told.

My concern is short engine life might reflect loading or exhaust water intake issues with your boat that might affect any repower choice you make. Still, I would have to say the current v-6's with 200+hp would be my choice just because they are in production and seem to be pretty solid in performance and reliability. If you can get fuel injection for a reasonable price give it a thought... it makes starting turn key simple.

Doc

Back to Top Printable version View DocHoliday's Profile Search for other posts by DocHoliday
 
Bill & Gia
"Seaman Recruit"




Joined: September 01 2006
Posts: 2
Posted: September 01 2006 at 13:34 | IP Logged Quote Bill & Gia

The 470 uses a cast aluminum block made by Mercury Marine and a 460 C. U. Ford cast iron cylinder head. (The same head used on the Ford 460 big block V8 only the 470 uses only one of the heads) Early 470's had problems with blowing head gaskets due to these metals expanding and contracting at different rates. This was partly solved later using a better head gasket.

HOWEVER combustion chamber temp is also controled by load. In other words yes the closed cooling system can keep the temp guage reading in the normal range, but if the engine is overloaded or run at near full rpm most of the time it will create overtemp in the combustion chamber and could cause head gasket seapage, or oil washdown by the piston rings.  These were the 2 main failures of this engine in my experience.

I formally owned a boatyard in CA. ofr 15 years and was a Mercury Dealer back then. We replaced many a 470/485 or 3.7L engine under warranty and worked with engineering in Stillwater Oklahoma. Mercury was forced to quit the engine  and move on. Yes some have worked well for people, but a larger portion did not. It appears  that engines used in heavy load application did not fair as well as those in lighter loads.  We rebuilt many of them since, and use the rebuild kit from Mercruy and a local machine shop. I would request a .002" extra piston to cylinder wall clearence over spec. this seemed to help with oil washdown as more oil would be loaded inbetween the piston rings and cylinder wall. Still if the engine ran hot it could be over quick. Also run the engine up to 3000rpm and make sure the timing is set properly both intial at idle and full timing at 3000rpm. I would set the timing back 2 degrees from spec. In other words if spec was 8 dergees at idel I would set our engines up at 6 degrees. This would help avoid detonation that is overtemp in the combustion chamber.

Make sure you are propped to the high end of your RPM range. Meaning if the rated rpm is 4500 to 4900 make sure your engine will get to 4900rpm at full throttle. This was what Mercury wanted us to do as a dealer.  Most of the people that were involved with this engine are no longer available. Now calling Mercury you will probably get someone not truely experienced with this engine, they would be reading out of textbooks.  There might me a guy named Horris in Stilllwater that is  still working there he is very knowledgeable with this model engine.

Good luck

 

 



__________________
Bill Cosbie
Back to Top Printable version View Bill & Gia's Profile Search for other posts by Bill & Gia
 
]
] ]
 

If you wish to post a reply to this topic you must first login
If you are not already registered you must first register

  Post ReplyPost New Topic

] ] ]
]
  ]
Printable version Printable version
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum
]
] ]

] ] ]
]
©2014, Boat Owners Association of The United States. All Rights Reserved.
This page was generated in 1.0293 seconds.
]
] ]