Like Tree0Likes

Spark Plug Problem

Reply
Old 07-30-2005, 11:23 AM
  #1
ATFastForward
Guest
 
Posts: n/a
Angry Spark Plug Problem

Upnorth here with my family and just ran around the lake in my parents 17 ft runabout. The engine made a funny sound and and acted like it was running on 3 cyclinders. We pulled the plugs and one had the tip melted and the ceramic was cracked. What is the problem? And if it is a plug issue is damage already done to the cyclinder?
 
Reply With Quote
Old 07-30-2005, 11:29 AM
  #2
Registered
 
GOODT's Avatar
 
Join Date: Apr 2005
Location: KENT ISLAND, MARYLAND
Posts: 2,675
Default Re: Spark Plug Problem

More Then Likly Sounds Like A Lean Run Condition, You Need To Do A Compression Test Might Have A Hole In The Cylinder
GOODT is offline  
Reply With Quote
Old 07-30-2005, 12:16 PM
  #3
ATFastForward
Guest
 
Posts: n/a
Default Re: Spark Plug Problem

Can you give a little more detail! Is there anything we can look or check ourselves. The motor is a 3 liter mercrusier.
We our up here on a weeks vacation with all the kids and of course they are chomping at the bit to go sking tubing etc.
 
Reply With Quote
Old 07-30-2005, 12:29 PM
  #4
Platinum Member
Platinum Member
Trade Score: (3)
 
MILD THUNDER's Avatar
 
Join Date: Jul 2004
Location: chicago
My Boats: 38 Fountain
Posts: 10,885
Default Re: Spark Plug Problem

Were the plugs loose when you took them out? That will cause that.

If its running lean, change the fuel filters and plugs.
MILD THUNDER is offline  
Reply With Quote
Old 07-30-2005, 12:33 PM
  #5
Platinum Member
Platinum Member
Trade Score: (3)
 
MILD THUNDER's Avatar
 
Join Date: Jul 2004
Location: chicago
My Boats: 38 Fountain
Posts: 10,885
Default Re: Spark Plug Problem

Is the motor ticking, knocking, or popping? Throw a new set of plugs in it and change the gas filters. If it pops thru the intake or exhaust, you probably have internal damage such as bent valve, head gasket, etc.

once you put the new plugs in, fire it up and pull the oil filler cap. If smoke is coming out a lot, you might have a cracked piston or a hole in it. Keep it simple for now, get the plugs and gas filter.
MILD THUNDER is offline  
Reply With Quote
Old 07-30-2005, 12:39 PM
  #6
ATFastForward
Guest
 
Posts: n/a
Default Re: Spark Plug Problem

My brother-in-law changed the plugs just before we came up north and yes he thinks that one was loose!
 
Reply With Quote
Old 07-30-2005, 06:31 PM
  #7
Registered
 
Join Date: Sep 2003
Location: Metairie, LA
My Boats: 42 Cigarette Tiger w/6's, 28 Cigarette SS
Posts: 433
Default Re: Spark Plug Problem

If a spark plug is loose, it will quickly overheat and burn the tip. It has to be torqued (tight) in the cylinder head to make compression AND to transfer (its) heat into the cylinder head.

If the engine wasn't run very long in this condition, you may be lucky with new plugs. Keep your fingers crossed.
CignificantOther is offline  
Reply With Quote
Old 07-30-2005, 06:50 PM
  #8
ATFastForward
Guest
 
Posts: n/a
Default Re: Spark Plug Problem

The fuel filter was changed just before we came up north, should we still change it again.
 
Reply With Quote
Old 07-30-2005, 07:16 PM
  #9
Registered
 
Join Date: Sep 2003
Location: Metairie, LA
My Boats: 42 Cigarette Tiger w/6's, 28 Cigarette SS
Posts: 433
Default Re: Spark Plug Problem

Nah, no need to.....if the plug was loose. If none of the other plugs were burned and/or excessively white on the tip, install new plugs (torque correctly) and take it for an easy run. Check for normal power, RPM, etc. If no popping, knocking, ticking.......enjoy the rest of your vacation.
CignificantOther is offline  
Reply With Quote
Old 07-31-2005, 08:21 AM
  #10
ATFastForward
Guest
 
Posts: n/a
Default Re: Spark Plug Problem

Thanks Guys! We are going to take it in for a compression test on Monday and go from there.
 
Reply With Quote
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
bleachers
Do It Yourself, Boating on a Budget
3
07-25-2008 10:59 AM
Smoothsix
General Q & A
3
06-09-2008 01:27 PM
baja36ft
General Q & A
5
12-19-2005 09:51 PM
RebarBox
General Boating Discussion
1
05-31-2003 09:39 PM
THRILLSEEKER
General Q & A
2
05-11-2003 05:55 PM



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 08:13 PM.


Copyright 2011 OffShoreOnly. All rights reserved.