Reply
 
Thread Tools Search this Thread Display Modes
 
Old 06-23-2015, 03:18 PM   #1
Ensign
 
Join Date: Jun 2015
Location: Jamestown, NC
Posts: 10
Default 1995 Maxum 2100 SRB

Hello all,
I just purchased a 2100 SRB in great shape here in central NC. Not new to boating but it's been awhile. The boat has a 5.0L Alpha motor....whatever that means. The engine is original and it only has 216 hours on it.

We took it out last weekend and had a great time with the 4 kiddies and 4 adults on board.

Two problems surfaced. The trim up wouldn't work but we did have a jumper wire on board that we used to bypass the solenoid for an on-water fix. Where can I purchase a replacement solenoid?

The major problem, however, was the engine would not rev past 3400 rpm and sucked up 19 gals of fuel in a couple hours! It sounds like the exhaust is restricted in some way and the engine can't breath. So at partial throttle the four barrel is cutting in passing lotsa of gas!!!!

I've not located a cutaway of the exhaust yet so that I can determine if there is an obstruction somewhere. I'm making a wild guess that due to the low engine hours something weird could have occurred to block the exhaust. The boat has never been in salt water. I would appreciate any pointers to quickly fix this....summer's here.

Thanks, Bill
__________________

bwycuff is offline   Reply With Quote
Old 06-23-2015, 05:19 PM   #2
Admiral
 
mmwjr's Avatar
 
Join Date: Feb 2012
Location: Perry Hall, Maryland
Posts: 5,589
Default

Bill welcome aboard.

5.0 is a maximized GM 5.0 (305 Cubic Inch) inboard engine.
Alpha is the mercruiser drive that is mounted on the back of the boat. This is the entry level drive for basic applications. They also offer a Bravo drive for high HP applications.

Regarding the trim solenoid any boating store will have it such as West Marine, or online stores. These are available in aftermarket from many suppliers such as Sierra.

An exhaust flapper may be stuck closed. This is located in the Y-Pipe where the lower rubber exhaust hose is. The flapper is there to prevent any water from flowing back up the exhaust from entering the engine thru its exhaust port.
__________________

__________________
Mike
mmwjr is offline   Reply With Quote
Old 06-23-2015, 07:02 PM   #3
Ensign
 
Join Date: Jun 2015
Location: Jamestown, NC
Posts: 10
Default

I once had a Y pipe on a car that collapsed inward showing no damage on the outside but the inside, once hack sawed open, had a 440 cu in engine trying to exhaust out through a pencil sized hole. So this seemed like a similar problem.

Is the exhaust flapper only on one side? How would you suggest freeing it up? WD40 or similar? Or a really big hammer?

Thanks.
bwycuff is offline   Reply With Quote
Old 06-23-2015, 10:03 PM   #4
Admiral
 
mmwjr's Avatar
 
Join Date: Feb 2012
Location: Perry Hall, Maryland
Posts: 5,589
Default

There are two flappers one on each side.

First verify its stuck closed. If it is I would replace them as they do break and fall down to the bottom of the pipe and are then a real PIA to remove.
__________________
Mike
mmwjr is offline   Reply With Quote
Old 06-24-2015, 04:13 AM   #5
Captain
 
Kevlar7r's Avatar
 
Join Date: Aug 2014
Location: Jacksonville, FL
Posts: 745
Default

I don't believe the 5.0l was ever offered with a 4 barrel. Only 2 barrel and efi/mpi.



Could it be a carb problem running the engine so rich that it can't rev?



Those flappers are just rubber or plastic. Can't imagine they would stick hard enough that exhaust pressure couldn't force them open.
Kevlar7r is offline   Reply With Quote
Old 06-24-2015, 12:28 PM   #6
Admiral
 
mmwjr's Avatar
 
Join Date: Feb 2012
Location: Perry Hall, Maryland
Posts: 5,589
Default

Not thinking the boat is running rich as a 5.0 turning 3400 rpm is going to burn 8 - 10 gph so in the couple of hours the OP ran the boat he burned 19 gallons which is in check with what I would expect.

Another potential source of not achieving WOT is the boat is over propped.

Also you had 8 people onboard which depending on the kids weight a good load for your set up.

What rpm can you achieve with 2 adults?

What prop is on the boat?
__________________
Mike
mmwjr is offline   Reply With Quote
Old 06-24-2015, 12:45 PM   #7
Captain
 
Kevlar7r's Avatar
 
Join Date: Aug 2014
Location: Jacksonville, FL
Posts: 745
Default

That's a good point Mike. My old boat was a 21' cuddy with a 5.7. I could plane with 4 adults, they had to walk up to the front untill I was on plane, then they could go sit down.
Kevlar7r is offline   Reply With Quote
Old 06-24-2015, 01:38 PM   #8
Moderator

 
Join Date: Apr 2008
Posts: 3,695
Default

Moved to the GENERAL sub-forum. Not sure why so many new threads are starting in the 'New Member Introductions' section lately.
__________________
Shhhhhh!!! Please lower your voice, the boat is sleeping.
shrew is offline   Reply With Quote
Old 06-24-2015, 01:57 PM   #9
Ensign
 
Join Date: Jun 2015
Location: Jamestown, NC
Posts: 10
Default

Haven't yet taken the air intake cover off to verify 2bl/4bl. Will do that Friday to see what we have.

Does anyone have a good diagram or part # for the exhaust flapper? From a drawing I saw earlier I'm not certain of the flapper location.

Thanks for your input.
bwycuff is offline   Reply With Quote
Old 06-24-2015, 02:25 PM   #10
Captain
 
Kevlar7r's Avatar
 
Join Date: Aug 2014
Location: Jacksonville, FL
Posts: 745
Default

Go to www.mercruiserparts.com they have all the exploded diagrams.



If you follow your exhaust, it goes header, possibly a spacer, riser elbow, then a rubber coupler, a piece of hard pipe, another rubber coupler, and then the y pipe. The flappers sit at the entrance to the y pipe, under the second rubber coupler.
__________________

Kevlar7r 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 10:39 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2018, vBulletin Solutions, Inc.