Reply
 
Thread Tools Search this Thread Display Modes
 
Old 02-29-2020, 06:31 PM   #21
Admiral
 
mmwjr's Avatar
 
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 7,615
Default

The compression numbers sound good, did all the plugs look about the same?

Contact Mercruiser with the drive serial number and they can tell you what gear ratio it is and be able to recommend a prop. The prop you have is wrong for this boat.
__________________

__________________
1997 2400 SCR
5.7 Vortec / Bravo 2
Mike
mmwjr is offline   Reply With Quote
Old 02-29-2020, 08:17 PM   #22
Lt. JG
 
Join Date: Feb 2020
Posts: 23
Default

Quote:
Originally Posted by mmwjr View Post
The compression numbers sound good, did all the plugs look about the same?

Contact Mercruiser with the drive serial number and they can tell you what gear ratio it is and be able to recommend a prop. The prop you have is wrong for this boat.
All the plugs are look the same.
So...i have a wrong prop?
I prefer that to a broken engine
__________________

Alvaroe46 is offline   Reply With Quote
Old 03-01-2020, 12:26 PM   #23
Commander
 
jrsick's Avatar
 
Join Date: Oct 2011
Location: Chesapeake, VA
Posts: 466
Default

A different prop may improve performance, but it won't come close to adding 1000 rpm to your WOT. You should continue to troubleshoot your engine while researching prop size.
__________________
2006 Bayliner BR205
A1 Gen 2 1.47
5.0 carb engine
jrsick is offline   Reply With Quote
Old 03-03-2020, 03:24 PM   #24
Moderator

 
Join Date: Apr 2008
Posts: 4,661
Default

Has the tachometer itself been ruled out? Are we sure it's accurate and not sticking?

Just a thought.
shrew is offline   Reply With Quote
Old 03-03-2020, 08:38 PM   #25
Lt. JG
 
Join Date: Feb 2020
Posts: 23
Default

Quote:
Originally Posted by shrew View Post
Has the tachometer itself been ruled out? Are we sure it's accurate and not sticking?

Just a thought.
Hi;
It has been proven, but thank you for the idea. It could have been a cause.

Thanks
Alvaroe46 is offline   Reply With Quote
Old 03-03-2020, 08:40 PM   #26
Lt. JG
 
Join Date: Feb 2020
Posts: 23
Default

Hi,I replaced the wire that didn't look so good. It is not tested because of bad weather (waves).
I wil try to check it on Saturday and i will post again.

THanks
Alvaroe46 is offline   Reply With Quote
Old 03-06-2020, 08:41 PM   #27
Lt. JG
 
Join Date: Feb 2020
Posts: 23
Default

Hi!
This engine have any sensor or limitator?

Thanks


Enviado desde mi iPhone utilizando Tapatalk
Alvaroe46 is offline   Reply With Quote
Old 03-06-2020, 09:31 PM   #28
Admiral
 
mmwjr's Avatar
 
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 7,615
Default

Quote:
Originally Posted by Alvaroe46 View Post
Hi!
This engine have any sensor or limitator?

Thanks


Enviado desde mi iPhone utilizando Tapatalk
Not certain as you did not tell us the year of the engine or answer my question if it has the Thunderbolt V ignition system. If it does then yes it can rev limit in safe mode if detonation is detected. You should also check for water in the gas by removing the fuel filter and emptying it’s contents into a clear jar to look for water and or sediment.
__________________
1997 2400 SCR
5.7 Vortec / Bravo 2
Mike
mmwjr is offline   Reply With Quote
Old 03-06-2020, 09:43 PM   #29
Lt. JG
 
Join Date: Feb 2020
Posts: 23
Default

Quote:
Originally Posted by mmwjr View Post
Not certain as you did not tell us the year of the engine or answer my question if it has the Thunderbolt V ignition system. If it does then yes it can rev limit in safe mode if detonation is detected. You should also check for water in the gas by removing the fuel filter and emptying itís contents into a clear jar to look for water and or sediment.


Sorry, I didn't read your comment.
Yes , it's thunderbolt. The engine's from '96.
I don't think there's any water in the gasoline.
But I'll check again.
Thank you very much.


Enviado desde mi iPhone utilizando Tapatalk
Alvaroe46 is offline   Reply With Quote
Old 03-06-2020, 11:44 PM   #30
Commander
 
donald's Avatar
 
Join Date: Jun 2016
Location: N.Calif.
Posts: 377
Default

You still did not answer Mikes question!
If it has a Thunderbolt V (5) then yes it could go into safe mode and have a rev limiter.
I would suggest you take your boat to a Mercruiser mechanic and have him look at it.
Don
__________________
1995 Maxum 2400 SCR 5.7 A1 G2 LUNA DE MIEL
1988 Bayliner 2455 5.0 IO (sold)
1987 Seaswerl 18ft C. Cabin 4.3 IO(lost in fire)
1976 16ft. Tahiti 2.5 IO (sold)
donald is offline   Reply With Quote
Old 03-07-2020, 12:12 AM   #31
Admiral
 
mmwjr's Avatar
 
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 7,615
Default

Being a 1996 it should be a Thunderbolt V (5) and not a Thunderbolt IV (4) so it has a knock sensor that can go into safe mode and restrict rpms is it detects knocking.
__________________
1997 2400 SCR
5.7 Vortec / Bravo 2
Mike
mmwjr is offline   Reply With Quote
Old 03-07-2020, 06:39 AM   #32
Lt. JG
 
Join Date: Feb 2020
Posts: 23
Default

Quote:
Originally Posted by donald View Post
You still did not answer Mikes question!
If it has a Thunderbolt V (5) then yes it could go into safe mode and have a rev limiter.
I would suggest you take your boat to a Mercruiser mechanic and have him look at it.
Don


Hi, I'm sorry if I didn't explain it properly. If it's 96, it does have the thunderbolt V.
I know this because it's on the cover
Thanks


Enviado desde mi iPhone utilizando Tapatalk
Alvaroe46 is offline   Reply With Quote
Old 03-07-2020, 06:42 AM   #33
Lt. JG
 
Join Date: Feb 2020
Posts: 23
Default

Quote:
Originally Posted by mmwjr View Post
Being a 1996 it should be a Thunderbolt V (5) and not a Thunderbolt IV (4) so it has a knock sensor that can go into safe mode and restrict rpms is it detects knocking.


Correct Thunderbolt V , As I put it before, it's written on the cover.


Enviado desde mi iPhone utilizando Tapatalk
Alvaroe46 is offline   Reply With Quote
Old 03-07-2020, 12:00 PM   #34
Admiral
 
mmwjr's Avatar
 
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 7,615
Default

Quote:
Originally Posted by Alvaroe46 View Post
Correct Thunderbolt V , As I put it before, it's written on the cover.


Enviado desde mi iPhone utilizando Tapatalk
u

Thought so, then yes it can limit rpm.
__________________
1997 2400 SCR
5.7 Vortec / Bravo 2
Mike
mmwjr is offline   Reply With Quote
Old 03-14-2020, 06:21 PM   #35
Lt. JG
 
Join Date: Feb 2020
Posts: 23
Default

Quote:
Originally Posted by mmwjr View Post
u

Thought so, then yes it can limit rpm.
Hi!!

I kept looking and on the engine cover it says thunderbolt V but on the ignition control module (attached to the exhaust manifold) it says thunderbolt IV. I think there's something weird. And there's a loose wire connector at the back of the engine. It looks like an ignition.


Thanks
Alvaroe46 is offline   Reply With Quote
Old 03-14-2020, 07:40 PM   #36
Admiral
 
mmwjr's Avatar
 
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 7,615
Default

Quote:
Originally Posted by Alvaroe46 View Post
Hi!!

I kept looking and on the engine cover it says thunderbolt V but on the ignition control module (attached to the exhaust manifold) it says thunderbolt IV. I think there's something weird. And there's a loose wire connector at the back of the engine. It looks like an ignition.


Thanks
Can you post pictures of the module and distributor?
__________________
1997 2400 SCR
5.7 Vortec / Bravo 2
Mike
mmwjr is offline   Reply With Quote
Old 03-14-2020, 07:44 PM   #37
Lt. JG
 
Join Date: Feb 2020
Posts: 23
Default

Quote:
Originally Posted by mmwjr View Post
Can you post pictures of the module and distributor?
Yes of course, tomorrow i will do it and i will post.

I suspect that the TB-V module broke at some point and now they've put in TB-IV.I don't know if it's possible or not.

The 8-pin connector on the TB-V module is disconnected and hidden behind the engine. I discovered it today.

thanks
Alvaroe46 is offline   Reply With Quote
Old 03-17-2020, 03:40 PM   #38
Commander
 
jrsick's Avatar
 
Join Date: Oct 2011
Location: Chesapeake, VA
Posts: 466
Default

ICM and distributor picture may tell a lot. I'm interested to see if the wires from the ICM to distributor have been spliced with new connectors. May be wrong ICM.
Could you also get a picture of the distributor rotor and the metal ring attached to the underneath of the rotor?
__________________
2006 Bayliner BR205
A1 Gen 2 1.47
5.0 carb engine
jrsick is offline   Reply With Quote
Old 03-17-2020, 04:32 PM   #39
Lt. JG
 
Join Date: Feb 2020
Posts: 23
Default

Hi everyone,
because of the fxxing virus I can't leave the house. It's forbidden.
I have to wait for permission and I can go down to the port.

many thank for all of you.
Alvaroe46 is offline   Reply With Quote
Old 03-17-2020, 11:29 PM   #40
Admiral
 
mmwjr's Avatar
 
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 7,615
Default

Understand, take care.
__________________

__________________
1997 2400 SCR
5.7 Vortec / Bravo 2
Mike
mmwjr is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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


Powered by vBadvanced CMPS v3.2.3

All times are GMT. The time now is 09:31 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2020, vBulletin Solutions, Inc.