Help: Mercruiser making ticking sound

Help: Mercruiser making ticking sound

Post by j.richards » Fri, 28 Sep 2001 01:15:30


Hi to all.

Thanks in advance for your help.

I have a 2000 Ski Centurion Elite V Drive with the 5.7L Mercruiser
engine. I have just noticed a ticking sound when the engine is idling
in neutral.  When I engage the drive (either forward or reverse), the
ticking stops.  Not sure if this is related, but, I notice a week or
so ago that the engine was making a "swishing" sound while idling.
Out of the water, idling the engine does not make the "swishing"
sound.  In the last week or so, I have not notice the sound.

Does anybody have any thoughts on either of the noises?  Could they be
related?
And, do I need to get the boat to a service person right away?

Your help and comments are appreciated.

James

 
 
 

Help: Mercruiser making ticking sound

Post by Deke deCastr » Fri, 28 Sep 2001 01:56:31

Could it be the flapper valves that keep water from surging back up into
exhaust manifolds?
--
Deke
Quote:

> Organization: http://groups.google.com/
> Newsgroups: rec.sport.waterski
> Date: 26 Sep 2001 09:15:30 -0700
> Subject: Help: Mercruiser making ticking sound

> Hi to all.

> Thanks in advance for your help.

> I have a 2000 Ski Centurion Elite V Drive with the 5.7L Mercruiser
> engine. I have just noticed a ticking sound when the engine is idling
> in neutral.  When I engage the drive (either forward or reverse), the
> ticking stops.  Not sure if this is related, but, I notice a week or
> so ago that the engine was making a "swishing" sound while idling.
> Out of the water, idling the engine does not make the "swishing"
> sound.  In the last week or so, I have not notice the sound.

> Does anybody have any thoughts on either of the noises?  Could they be
> related?
> And, do I need to get the boat to a service person right away?

> Your help and comments are appreciated.

> James


 
 
 

Help: Mercruiser making ticking sound

Post by Doug Meredit » Fri, 28 Sep 2001 04:35:28


Quote:
> I have a 2000 Ski Centurion Elite V Drive with the 5.7L Mercruiser
> engine. I have just noticed a ticking sound when the engine is idling
> in neutral.  When I engage the drive (either forward or reverse), the
> ticking stops.

The only ticking that I have ever heard is the lifters.  At idle, the
oil pressure is low.  When you give it a bit of gas (putting it in gear)
the rpm increases a bit, and the pressure goes up, and the ticking
stops.  If you increase the throttle VERY slightly, while the boat is
still in neutral, does the ticking stop?  Is your oil pressure at idle
very low, say 20 psi?

Quote:
>Not sure if this is related, but, I notice a week or
> so ago that the engine was making a "swishing" sound while idling.

I have heard a similar noise on a Response.  When in the water, behind
the boat.  It is from the exhaust being under water, and as the boat
rocks, part of the exhaust comes out of the water, and it makes a swish
or a bubbling noise.  Just a thought.

 
 
 

Help: Mercruiser making ticking sound

Post by j.richards » Fri, 28 Sep 2001 07:26:00

The ticking seems to be keeping time with the engine.  It sounds like
electricity arcing from a bad spark plug lead.  I doubt that I have a
bad wire on a nearly new boat, but I will check.  I will check the
flappers as well.

Thanks for the reply.  Any other thoughts are appreciated.

Quote:

> Could it be the flapper valves that keep water from surging back up into
> exhaust manifolds?
> --
> Deke


> > Organization: http://groups.google.com/
> > Newsgroups: rec.sport.waterski
> > Date: 26 Sep 2001 09:15:30 -0700
> > Subject: Help: Mercruiser making ticking sound

> > Hi to all.

> > Thanks in advance for your help.

> > I have a 2000 Ski Centurion Elite V Drive with the 5.7L Mercruiser
> > engine. I have just noticed a ticking sound when the engine is idling
> > in neutral.  When I engage the drive (either forward or reverse), the
> > ticking stops.  Not sure if this is related, but, I notice a week or
> > so ago that the engine was making a "swishing" sound while idling.
> > Out of the water, idling the engine does not make the "swishing"
> > sound.  In the last week or so, I have not notice the sound.

> > Does anybody have any thoughts on either of the noises?  Could they be
> > related?
> > And, do I need to get the boat to a service person right away?

> > Your help and comments are appreciated.

> > James

 
 
 

Help: Mercruiser making ticking sound

Post by TJaco » Fri, 28 Sep 2001 09:04:52

Quote:

> Hi to all.

> Thanks in advance for your help.

> I have a 2000 Ski Centurion Elite V Drive with the 5.7L Mercruiser
> engine. I have just noticed a ticking sound when the engine is idling
> in neutral.  When I engage the drive (either forward or reverse), the
> ticking stops.  Not sure if this is related, but, I notice a week or
> so ago that the engine was making a "swishing" sound while idling.
> Out of the water, idling the engine does not make the "swishing"
> sound.  In the last week or so, I have not notice the sound.

> Does anybody have any thoughts on either of the noises?  Could they be
> related?
> And, do I need to get the boat to a service person right away?

> Your help and comments are appreciated.

Which 5.7....carb, mpi, or Scorp? Mpi and scorp motors are known for
this, usually you are hearing the fuel rails and or injector noise.

- Show quoted text -

Quote:

> James

 
 
 

Help: Mercruiser making ticking sound

Post by A. Bish » Fri, 28 Sep 2001 09:23:43

One way to isolate the sound might be to use a piece of garden hose or
flexible tubing with a funnel stuck into it.  Hold the funnel up to
your ear while the engine is running and move the opposite end of the
hose around the motor box.  This will help isolate the ticking by
sounding louder when the end of the hose is near the source.

Also, try dressing your belts with wax when the boat is idling.  Just
hold a piece of wax up against the belt on either side.  Obviously, be
careful not to get caught up in the belt.  Sometimes belts can make
funny noises.

Does the noise stop when you go in gear only because the idle drops?
What if you speed up a little while in gear, does it reoccur?

AB

 
 
 

Help: Mercruiser making ticking sound

Post by j.richards » Fri, 28 Sep 2001 20:19:15

Quote:


> > Hi to all.

> > Thanks in advance for your help.

> > I have a 2000 Ski Centurion Elite V Drive with the 5.7L Mercruiser
> > engine. I have just noticed a ticking sound when the engine is idling
> > in neutral.  When I engage the drive (either forward or reverse), the
> > ticking stops.  Not sure if this is related, but, I notice a week or
> > so ago that the engine was making a "swishing" sound while idling.
> > Out of the water, idling the engine does not make the "swishing"
> > sound.  In the last week or so, I have not notice the sound.

> > Does anybody have any thoughts on either of the noises?  Could they be
> > related?
> > And, do I need to get the boat to a service person right away?

> > Your help and comments are appreciated.

> Which 5.7....carb, mpi, or Scorp? Mpi and scorp motors are known for
> this, usually you are hearing the fuel rails and or injector noise.

This is the 5.7 MPI.  I had not considered the possiblity of this
being the sound of an injector.  If the noise is an injector, why
would it suddenly start making the sound?  The engine has about 120
hours on it.

Thanks.

- Show quoted text -

Quote:

> > James

 
 
 

Help: Mercruiser making ticking sound

Post by j.richards » Fri, 28 Sep 2001 20:24:29

Quote:

> One way to isolate the sound might be to use a piece of garden hose or
> flexible tubing with a funnel stuck into it.  Hold the funnel up to
> your ear while the engine is running and move the opposite end of the
> hose around the motor box.  This will help isolate the ticking by
> sounding louder when the end of the hose is near the source.

> Also, try dressing your belts with wax when the boat is idling.  Just
> hold a piece of wax up against the belt on either side.  Obviously, be
> careful not to get caught up in the belt.  Sometimes belts can make
> funny noises.

> Does the noise stop when you go in gear only because the idle drops?
> What if you speed up a little while in gear, does it reoccur?

> AB

AB,

Thanks for the garden hose tip.  I will try it.  After engaging the
engine, I cannot say that I hear the noise at any RPM.  It could be
that the sound is present but is being masked by the ambient sound in
the boat as I accelerate. I am going to the lake this weekend.  I will
take my hose and funnel and report my findings.

James

 
 
 

Help: Mercruiser making ticking sound

Post by j.richards » Fri, 28 Sep 2001 20:35:47

Quote:



> > I have a 2000 Ski Centurion Elite V Drive with the 5.7L Mercruiser
> > engine. I have just noticed a ticking sound when the engine is idling
> > in neutral.  When I engage the drive (either forward or reverse), the
> > ticking stops.
> > The only ticking that I have ever heard is the lifters.  At idle, the
> oil pressure is low.  When you give it a bit of gas (putting it in gear)
> the rpm increases a bit, and the pressure goes up, and the ticking
> stops.  If you increase the throttle VERY slightly, while the boat is
> still in neutral, does the ticking stop?  Is your oil pressure at idle
> very low, say 20 psi?

Doug, thanks for the response. I haven't noticed the oil pressure
being particularly low.  I will check this weekend. The sound is very
crisp and doesn't sound mechanical. Though I don't know what a
clicking lifter would sound like.  If the sound is related to the
lifters, wouldn't I hear more than one lifter making the noise?

Quote:
> >Not sure if this is related, but, I notice a week or
> > so ago that the engine was making a "swishing" sound while idling.

> I have heard a similar noise on a Response.  When in the water, behind
> the boat.  It is from the exhaust being under water, and as the boat
> rocks, part of the exhaust comes out of the water, and it makes a swish
> or a bubbling noise.  Just a thought.

I had not consider the exhaust being the source for the sound.  It
does sound like millions of exhaust bubbles reaching the surface at
the same time.  Having not heard that particular noise in a few weeks
it may be tougher to track down.  I do appreciate the thought.
 
 
 

Help: Mercruiser making ticking sound

Post by Doug Meredit » Sat, 29 Sep 2001 01:08:39

Quote:

> Doug, thanks for the response. I haven't noticed the oil pressure
> being particularly low.  I will check this weekend. The sound is very
> crisp and doesn't sound mechanical. Though I don't know what a
> clicking lifter would sound like.  If the sound is related to the
> lifters, wouldn't I hear more than one lifter making the noise?

Its hard to tell if it is one or many.  You might be hearing one, or you
might be hearing all 16.  I have heard it on my 502 every once in a
while when it is warm, and at idle.  As soon as I touch the gas, it goes
away.  As I think someone mentioned, it can also be the injectors
ticking.  They make a special steoscope <sp>with a metal rod on it.  You
can touch different parts of the engine, and here any abnormal noises.

Quote:
> I had not consider the exhaust being the source for the sound.  It
> does sound like millions of exhaust bubbles reaching the surface at
> the same time.  Having not heard that particular noise in a few weeks
> it may be tougher to track down.  I do appreciate the thought.

Could have just been that day, and the way the boat was rocking in the
water.

BTY, IIRC, this is on a 2000 boat.  It IS still under warranty isn't it?

 
 
 

Help: Mercruiser making ticking sound

Post by j.richards » Sat, 29 Sep 2001 07:57:30

Quote:


> > Doug, thanks for the response. I haven't noticed the oil pressure
> > being particularly low.  I will check this weekend. The sound is very
> > crisp and doesn't sound mechanical. Though I don't know what a
> > clicking lifter would sound like.  If the sound is related to the
> > lifters, wouldn't I hear more than one lifter making the noise?

> Its hard to tell if it is one or many.  You might be hearing one, or you
> might be hearing all 16.  I have heard it on my 502 every once in a
> while when it is warm, and at idle.  As soon as I touch the gas, it goes
> away.  As I think someone mentioned, it can also be the injectors
> ticking.  They make a special steoscope <sp>with a metal rod on it.  You
> can touch different parts of the engine, and here any abnormal noises.

> > I had not consider the exhaust being the source for the sound.  It
> > does sound like millions of exhaust bubbles reaching the surface at
> > the same time.  Having not heard that particular noise in a few weeks
> > it may be tougher to track down.  I do appreciate the thought.

> Could have just been that day, and the way the boat was rocking in the
> water.

> BTY, IIRC, this is on a 2000 boat.  It IS still under warranty isn't it?

Doug, it is a 2000 year model bought in October of 1999.  The
Mercruiser warranty is for one year.  To extend the warranty is
approximately $1500 for four years.  I thought that was a little
steep.  I hope I never need it, but, I can buy a lot of service for
that amount of money.  A fool and his money are soon parted.

James

 
 
 

Help: Mercruiser making ticking sound

Post by Doug Meredit » Sat, 29 Sep 2001 11:06:01

Quote:

> Doug, it is a 2000 year model bought in October of 1999.  The
> Mercruiser warranty is for one year.  To extend the warranty is
> approximately $1500 for four years.  I thought that was a little
> steep.  I hope I never need it, but, I can buy a lot of service for
> that amount of money.  A fool and his money are soon parted.

Good point.  I just wanted to see if you couldn't figure out the
problem, that you could get the dealer to do it for free.  FWIW on
extended warranty's, I had never bought them either.  I bought a 1994
boat.  I paid $1000 for a 2 year extended warranty.  In the first 2
months I had it, they covered $1200 dollars. The only time I ever made
money on an insurance policy. <g>

doug

 
 
 

Help: Mercruiser making ticking sound

Post by Jeff R. Harmo » Sun, 30 Sep 2001 11:27:39


Quote:

> If the sound is related to the
> lifters, wouldn't I hear more than one lifter making the noise?

Not necessarily.  Lifters (or anything in the valvetrain) would tick at
half engine speed.  They sell automotive stethoscopes (at Napa et al.)
for something on the order of $5 if the hose doesn't work out.  They'll
get you down to within an inch or so of the source of the noise.

JR