92 Renken/Yamaha core plug popped out???

jvigier

Seaman
Joined
Mar 16, 2009
Messages
51
Still new at all of this but feeling my way around...

Inherited a 92 Renken, replaced the 650 holley street carb for an appropriate Rochester Qjet. That was easy.

Thanks to TheCaptnKen, I took apart the lower unit, cleaned up the whole thing so my shifting problem should be history.

I was cleaning up the mess in the bilge (previous owner was a real slob apparently) I found one of the core plugs...sure enough when I ran my hand underneath the manifold...nothing there but the hole...wth?????

I know from research they just don't pop out. Freeze is unlikely since the boat spent most of it's life in Florida and the last two years in coastal NC where the last time it froze was before I was born...and that was a while ago!

So now I am worried about the darn thing having overheated?

Gonna go back to it tomorrow and check on the oil...cracked block maybe?

Hoping I didn't inherit a 3000 lbs anchor, I have already spent cash on drive cable, new carb and ordered a ton of fabric to redo the upholstery...would be a bummer to get stuck with all that stuff.

I should have mentioned that with the mickey ears, the boat cranked right up and idled smoothly.

If I find no evidence of a cracked block (fingers crossed), should I just buy a new one, add sealant and hammer it in?
 

Bt Doctur

Supreme Mariner
Joined
Aug 29, 2004
Messages
19,285
Re: 92 Renken/Yamaha core plug popped out???

didnt you notice the leak when you had it running on the hose?
 

jvigier

Seaman
Joined
Mar 16, 2009
Messages
51
Re: 92 Renken/Yamaha core plug popped out???

Honestly...no, it was four in the morning when I finally got the carb and lower unit work done....and it had been raining for the past 3-4 days (I am doing a head gasket on my wife's Q45 so the shop is tied up...had to work outside).
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
70,931
Re: 92 Renken/Yamaha core plug popped out???

Ayuh,... Pound in a new coreplug,+ Roll the dice...

It might be alright...
 

jvigier

Seaman
Joined
Mar 16, 2009
Messages
51
Re: 92 Renken/Yamaha core plug popped out???

Got mirror and flashlight and no good news to report:

Cracked manifold all the way accross the rear spout...

Shop next door has a master welder who is recommending baking the manifold then cutting a groove along the crack and nickel welding it.

My guess is a freeze crack since the engine oil is clean of milky residue and the engine cranks and idles smoothly so an overheating crack seems unlikely.

Thoughts?

Trying to find a replacement has turned into a dead end...anyone with spare parts lmk, I am definitely interested.
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
70,931
Re: 92 Renken/Yamaha core plug popped out???

anyone with spare parts lmk,

Ayuh,... Our resident Yamaha Expert,...

I'd be inspecting both manifolds,+ risers Super Closely,...
They're cracked Out,... cracked In is even Worse...

That said,...
I welded a set of Frozen manifolds once using a BBQ grill,+ nickle rod...
It worked til I came up with a New set...
 
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