Penta AQ125b Induction / Exhaust manifold

[hank3rd]

Hello everyone. I am starting to repair an 85 bayliner capri and need some help. I bought a manual on eBay and one online in PDF format, but I either have the wrong ones or they do not cover what I need.

When I started the engine (with muffs), water seemed to get into the motor housing. I was baffled until someone informed me about freeze plugs. I could not find anything wrong and it was difficult to observe since the carb needs new gaskets and stalls on idle. That is the next project and I have the gasket kit (gas is seeping out).

I did notice that the water was coming out from the bottom of the exhaust/intake manifold. I felt underneath and there was a hole that was not plugged. It is hard to see and work under there because of space and clearance issues. I found the freeze plug in the motor housing and tried putting it back. It seems as though it is not going flush with the manifold or going recessed. There is another one next to it that is also not flush or recessed that was already there. I do not know if that one if in correct or not. I cannot view the plugs unless I take off the manifold.

I was wondering if someone that is familiar with this can help out. Do I need to take off the manifold and what parts (gaskets,ect) would I need to put it back on?

Thanks!

-Hank

 

[Don S]

Re: Penta AQ125b Induction / Exhaust manifold

If you have water coming out the bottom of the manifold. If the "freeze" plugs are popped out, you may also have a cracked exhaust manifold.
Reed this on "Freeze plugs" http://forums.iboats.com/showthread.php?t=192525

I will probably have to remove the exhaust manifold to put in a new plug if the mainfold didn't crack.
Gaskets and a new plug would be needed. Don't try to reuse popped plugs, they are not reusable.

I would bet you bought aftermarket manuals, and OEM engine manual costs about 20 bucks, or you can download one for free at this link.
http://www.4shared.com/account/file/55815583/fad4e100/AQ125145_AB_Service_Manual.html

 

[Don S]

Re: Penta AQ125b Induction / Exhaust manifold

As a rule you buy freeze plugs as a set for the entire engine and as one has popped I would be highly suspect of the rest and would replace them all.

One thing you many not know about the 125's Bubba, they are a closed cooled engine. The engine has (or should have) antifreeze in it, but the exhaust manifold is raw water cooled and could freeze if it was cold enough, and why the plugs are popped out.

 

[a70eliminator]

Re: Penta AQ125b Induction / Exhaust manifold

There is a type of expation plug you can get in there without having to remove the manifolds. They are made of rubber and have a brass insert with brass nut and bolt, you just insert the plug and tighten the wingnut, they work great. I'll see if I can find a photo link.

 

[a70eliminator]

Re: Penta AQ125b Induction / Exhaust manifold

http://www.plasticoid.com/Expansionplugs.htm

 

[hank3rd]

Re: Penta AQ125b Induction / Exhaust manifold

Thanks for your help so far. Once it starts to warm up, I am going to order the plugs and gaskets and remove the manifold since it is so hard to work in that confined space. I will report back as soon as I have some information.