New to Volvo Penta IB/OB Motors

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DJ_Thrive

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Aug 16, 2011
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Greetings,
I just purchased a nice 86 Bayliner Capri with the Volvo Penta 275 HP (I assume the 275 indicates the HP?) IB/OB on it. It also reads "2.3 Liter SOCH". I would like a source for info on how it works; I need to fix the overheating problem. Apparantly there are 2 cooling systems on this motor, one that draws lake water in (that pump was recently replaced), and a second water pump pump for the closed system with the radiator (I assume that's the one I'll need to replace). I'd like to know how the coolant systems work with each other, and if the water pump is the caus eof the overheating.

Also the starter/solenoid appear to be intermittent, so I need to know what I'm looking at there as well. Does it have an all in one starter/solenoid assembly, or are the starter and solenoid separate, like on my Johnson Outboards?

Finally, what's a good source for purchasing affordable parts for the Volvo Penta IB/OB motors?

Thank you in advance for any assistance.

Cheers

Nate
 
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insttech1

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Don S

Don S

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Re: New to Volvo Penta IB/OB Motors

The 275 is the type of outdrive, not the engine. Your engine may be thw AQ131 which is a SOHC 2.3L engine.

Go to the link below, and type in AQ131 in the engine type box, you may have either an A or B model, maybe the owners manual will help you find out.
http://www.volvopenta.com/volvopent...lication_search/pages/publication_search.aspx

On marine engines, the first thing you check on an overheat problem is the raw water pump impeller.
 
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DJ_Thrive

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Re: New to Volvo Penta IB/OB Motors

Thanks for the info guys! Sorry I'm such a noob...lol. Now I have a new challenge to figure out: On either rear outer corner of the hull is an 8 or 10 inch long vent attached to small white ductwork that runs down towards the engine compartment. They are supposed to be mounted to something, but are free hanging. One of the ducts has a green fan in the end that is not wired up (See image). I have differing opinions on the purpose of these vents: some say it's for engine cooling (I doubt it), some say it's to remove exhaust from the engine compartment before starting the engine, so I don't blow my boat up (a more likely reason). Either way, I have no idea where to mount them to, and what this system is called. If you have some info, I would appreciate it

View attachment 113514
 
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possum2082

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Re: New to Volvo Penta IB/OB Motors

sounds like that is your blower, which is duct work that removes explosive gases. you are supposed to run it for 4 minutes before you start.

you should have a blower switch on your instrument panel. try that and see if anything happens.
 
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PiratePast40

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Re: New to Volvo Penta IB/OB Motors

It's a bilge fan to vent fuel vapors. There should be an inlet (the one that's hanging free) to introduce air into the engine compartment and the forced air suction attached to the fan. That suction should be in the lower third of the engine bay to draw out fuel vapors and exhaust them overboard.

If you have a fuel leak in an IO, the fumes will build up and can create an explosive mixture. You should turn on the vent fan and run it 3-4 minutes prior to engine start and when idling. But NEVER operate the fan while refueling. The risk of a stray spark and subsequent ignition is the reason that IO's have marine rated electrical components that can cause a spark such as the starter, alternator, and distributor cap.
 
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DJ_Thrive

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Re: New to Volvo Penta IB/OB Motors

Thanks for the words of wisdom, guys. It's not wired up, so I guess I need to find that switch, lol. Both the inlet and the side with the fan are hanging free, so I need to figure out where to mount the duct with the fan in it. It has a mounting bracket on it...
 
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insttech1

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Re: New to Volvo Penta IB/OB Motors

Those could have been tampered with many times over the years. They can split relatively easily, so someone may have shortened them anywhere on the ends, or in between.

It may be best to find a pic of your exact boat setup to see where they "should" go, because if they don't extend far/low enough to pull out gas fumes, or are cracked all over the place, then they really aren't doing anything.

Each one should lead in, and out, of the boat.

The "hoses" are also sold as kits at many marine stores, and I think a set of 2 was less than $30 at my local place....but that is with the assumption that you have something similar to my accordion-style setups that are about 3.5" in diameter...
 
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DJ_Thrive

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Re: New to Volvo Penta IB/OB Motors

I believe I have the cooling problem licked; I fixed a leak in the raw water system, checked the impeller (its new), and put antifreeze instead of water into the closed system.

I am replacing the Accelerator Pump on the carb that was leaking, Im hoping htis cures my idling issue.

But starting it with the key is still very intermittent. I have 12 Volts to the starter, and can start it with jumper cables and the batter...I'm thinking my ignition switch may be bad, or perhaps the wire from the switch to the starter is bad? Any ideas?

Also, the wiring is a nightmare...factory wires are cut, and theres a rats nest of new wires and new switches running all over the place, yet nothing is hooked up or working. I can touch wires from my electric trim/tilt to the battery and make that work, same with the bilge exhaust fan and bilge pump. Any reccomends on wiring it back up right? The schematic in the manual does not have everything labeled on it.

Still enjoying the project, thanks for the tips.
 
Don S

Don S

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Re: New to Volvo Penta IB/OB Motors

You never posted what engine you actually have. Makes it really tough to find wiring diagrams without knowing.
 
wellcraft19

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Re: New to Volvo Penta IB/OB Motors

Like Don said, tell us what you are working on...

As for starting issues, part from your wiring, it might be the associated with the "neutral" switch in the shift/throttle lever. It will prevent you from starting while in gear, and not uncommon to have a glitch there (loose spade connectors).

Otherwise, tons of information out "here" and once you have provided engine/drive info, even the "simple" owners manual will have a wiring diagram in the back. Wiring on these basic (carburated) engines is not really complex at all. The diagrams will tell you what colors (following ABYC standards) and where they go.
 
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DJ_Thrive

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Re: New to Volvo Penta IB/OB Motors

I forgot, lol. I have the 2.3L SOHC AQ131A engine with the 275 Outdrive. Thanks!
 
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Mullin

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Re: New to Volvo Penta IB/OB Motors

DJ_Thrive said:
I am replacing the Accelerator Pump on the carb that was leaking, Im hoping htis cures my idling issue.
Click to expand...
Not likely, the Accelerator pump is the extra squirt of gas for accelerating, nothing to do with idle. For idle there is the mixture screw, idle screw, idle jet, and the idle circuit orifice. Pretty simple carb, just two adjustments and two things to clean.

DJ_Thrive said:
But starting it with the key is still very intermittent. I have 12 Volts to the starter, and can start it with jumper cables and the batter...I'm thinking my ignition switch may be bad, or perhaps the wire from the switch to the starter is bad? Any ideas?
Click to expand...
In addition to what wellcraft19 said about the nuetral switch, it could be just bad contacts due to corrsion. You may try inspecting and cleaning or scuffing the contacts on the back of the ignition switch and the fuse panel.

DJ_Thrive said:
Also, the wiring is a nightmare...factory wires are cut, and theres a rats nest of new wires and new switches running all over the place, yet nothing is hooked up or working. I can touch wires from my electric trim/tilt to the battery and make that work, same with the bilge exhaust fan and bilge pump. Any reccomends on wiring it back up right? The schematic in the manual does not have everything labeled on it
Click to expand...
That sucks. Ripping everything out and running new wires doesn't sound fun at all. Hopefully its not as bad as it looks and you can reassemble the factory wiring and clean out the junk. Good luck.
 
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DJ_Thrive

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Re: New to Volvo Penta IB/OB Motors

Thanks for the infos, guys.
By the way I paid $410 for this baby, and pics are below
IMG_2820.jpgIMG_2822.jpgIMG_2821.jpg
 
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Mullin

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Re: New to Volvo Penta IB/OB Motors

Wow 400 bucks is great. Saves you lots of money to use on repairs! Happy Boating!
 
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insttech1

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Re: New to Volvo Penta IB/OB Motors

Boat has nice looking lines to it....should make an awesome project!
 
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DJ_Thrive

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Re: New to Volvo Penta IB/OB Motors

Happy Monday

So I replaced the accelerator pump last week, which fixed my fuel leak, and got it started (Have to start it by jumping the starter straight from the battery at the moment), and revved it up from the little throttle arm under the carbeurator, then let it go to see if it would idle. It came back down to a high idle, then slowly died. Started it again, and it ran, then idled a little longer. Third time, revved it a good few times, then it idled (high) for a while. Ran it for about 5 minutes, revving it, then letting it idle. After it had idled (high) for a few minutes, I started turning the air mixture screw underneath the accelerator pump, which killed it. So I turned the screw back to where it was previously, but never could get it to start again. Kept trying to start it, til the battery got low. So I charged it and tried starting it yesterday, but it still won't start again. Any idea why it won't start now? It started and ran just fine on Friday...
 
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