Like Tree0Likes

454 Mercruiser Engine Problems

Reply
Old 03-24-2010, 07:18 PM
  #1
Registered
Thread Starter
 
bimini run's Avatar
 
Join Date: Jan 2001
Location: Long Island, NY
My Boats: 1998 21' Baja Hammer
Posts: 175
Default 454 Mercruiser Engine Problems

Alright...so I've got some problems with my 454 mercruiser, and it's frustrating . Basically, ever since i got it, the exhaust manifold's have been cracking every 2 years...which is not right. When i winterize it, i pull ALL the plugs (and i mean all the plugs). I usually poke around with a small screw driver or wire to get all the crap out until the water drains. I pull all of the hoses out of the risers, drain the water, and poor antifreeze through the hoses that supply water to them until the antifreeze pours out the exhaust. I dunno what i could be doing wrong someone help me
$2k every 2 years is not a fun fee to pay...
bimini run is offline  
Reply With Quote
Old 03-25-2010, 01:51 AM
  #2
Registered
 
Join Date: Sep 2007
Location: Tulsa, Ok
My Boats: Donzi 22 Classic
Posts: 166
Default

I have the same motor. I hook ear muffs to the drive and run 3 or 4 gallons of RV antifreeze through the motor (until the antifreeze it spit out if the exhaust for a while). Then, I take the thermostat out, and fill the motor up until it runs out the pipes and replace the thermostat.

I bought one of the little self-winterizing kits from Boater's World.
Planetwarmer is offline  
Reply With Quote
Old 03-25-2010, 11:22 AM
  #3
Registered
 
TSPM's Avatar
 
Join Date: Jul 2004
Location: ~ Long Island ~ NY
My Boats: PREMIER PERFORMANCE BOAT DEALERSHIP
Posts: 3,374
Default

Quote:
Originally Posted by Planetwarmer View Post
I have the same motor. I hook ear muffs to the drive and run 3 or 4 gallons of RV antifreeze through the motor (until the antifreeze it spit out if the exhaust for a while). Then, I take the thermostat out, and fill the motor up until it runs out the pipes and replace the thermostat.

I bought one of the little self-winterizing kits from Boater's World.
Run 6 gallons ........ up through the whole system ...... 5 usually take care of it but 6 good insurance
TSPM is offline  
Reply With Quote
Old 03-25-2010, 12:18 PM
  #4
Registered
 
Join Date: Nov 2007
Location: Finksburg, MD
My Boats: sold it now looking
Posts: 126
Default

Maybe if you watched a professional merc mechanic, you might see something you are doing wrong. I've read your other posts on this and if you"ve done evrything recommened I can't see why they would still be cracking.
steveh1209 is offline  
Reply With Quote
Old 03-25-2010, 02:51 PM
  #5
Charter Member # 55
Charter Member
 
Griff's Avatar
 
Join Date: Oct 2000
Location: Omaha
My Boats: .......32............. ...............Active Thunder....
Posts: 15,738
Default

Same answers Not to mention, you can get used Merc manifolds all over for couple hundred bucks.
http://www.offshoreonly.com/forums/d...-problems.html
Griff is offline  
Reply With Quote
Old 03-25-2010, 03:49 PM
  #6
Registered
Thread Starter
 
bimini run's Avatar
 
Join Date: Jan 2001
Location: Long Island, NY
My Boats: 1998 21' Baja Hammer
Posts: 175
Default

Quote:
Originally Posted by Griff View Post
Same answers Not to mention, you can get used Merc manifolds all over for couple hundred bucks.
http://www.offshoreonly.com/forums/d...-problems.html
hehe, i know just seeing if i could get any other responses because i didn't know if i posed that in the right section . I've been thinking about replacing the manifolds myself but i have two problems. 1. I don't know how to, and 2. I don't want to replace them if they're just gonna break again. And @TSPM, after I'm done I've usually used about 5 or 6 gallons of AF. It's very frustrating and i don't want to replace them if I'm just gonna be posting here in another 2 years saying "they broke again".
bimini run is offline  
Reply With Quote
Old 03-25-2010, 04:23 PM
  #7
Registered
 
TSPM's Avatar
 
Join Date: Jul 2004
Location: ~ Long Island ~ NY
My Boats: PREMIER PERFORMANCE BOAT DEALERSHIP
Posts: 3,374
Default

Quote:
Originally Posted by bimini run View Post
It's very frustrating and i don't want to replace them if I'm just gonna be posting here in another 2 years saying "they broke again".
If that's the case something is wrong elsewhere or it is not winterized properly. Buy the manifolds/parts and have them installed by a Merc dealer same with winterizing. We have sold and serviced numerous 454's and have had no issues.
TSPM is offline  
Reply With Quote
Old 03-25-2010, 08:18 PM
  #8
Charter Member
Charter Member
 
bowtie's Avatar
 
Join Date: Jan 2001
Location: New Jersey
Posts: 665
Default

I agree with TSPM, I have winterized hundreds of 454's and never had a manifold crack. I have replaced many manifolds for other reasons though, and the replacements last many years, even aftermarket. Something is wrong, where are they cracking? As far as winterizing, if you just remove the hose from the bottom of the manifold all the water will come out. There's nothing to freeze. When do you notice the crack, in the spring after the first startup? If not do you have good water flow?
bowtie is offline  
Reply With Quote
Old 03-25-2010, 08:53 PM
  #9
Registered
 
TSPM's Avatar
 
Join Date: Jul 2004
Location: ~ Long Island ~ NY
My Boats: PREMIER PERFORMANCE BOAT DEALERSHIP
Posts: 3,374
Default

Quote:
Originally Posted by bowtie View Post
I agree with TSPM, I have winterized hundreds of 454's and never had a manifold crack. I have replaced many manifolds for other reasons though, and the replacements last many years, even aftermarket. Something is wrong, where are they cracking? As far as winterizing, if you just remove the hose from the bottom of the manifold all the water will come out. There's nothing to freeze. When do you notice the crack, in the spring after the first startup? If not do you have good water flow?
Good point ........ do you have blockage in the flow system or ....... how is your water pump ....... if you have blown impellers your not pumping the non tox through the system etc etc etc ........ do your homework ........ there is something not adding up here.
TSPM is offline  
Reply With Quote
Old 03-25-2010, 08:56 PM
  #10
Registered
 
TSPM's Avatar
 
Join Date: Jul 2004
Location: ~ Long Island ~ NY
My Boats: PREMIER PERFORMANCE BOAT DEALERSHIP
Posts: 3,374
Default

one more point .... if you don't have a clue PAY and take it to a Merc Certified dealer for a complete inspection ...... they will find the problem if you can't ...... just some good advise thats all

Last edited by TSPM; 03-25-2010 at 08:58 PM.
TSPM is offline  
Reply With Quote
Reply



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 On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 01:24 AM.


Copyright 2011 OffShoreOnly. All rights reserved.