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AQ 131 A To sleeve one cyclinder??

W

windvane

New member
Hi,
I have an AQ131A that had a seized number 4 piston (water sat in the cyclinder), I disassembled the engine and was able to get the piston free from the bore. I took the block in to my local machine shop and on the initial inspection was told that #4 would probably have to be bored, and if they bore one, they usually bore all cyclinders to match. The engine doesnt seem to have a lot of hours on it, and it seems like it would be a waste to bore all 4 cyclinders and replace all the pistons. What would you recomeend having done? I am leaning towards sleeveing #4 and rebore to standard size.

Thanks for your input.

Robert
 
RicardoMarine said:
Robert... source 4 new Volvo Penta Marine pistons and ring sets before you make this decision.


.
Click to expand...

I take it that the pistons are hard/expensive to find?!
Is there a difference between the automotive and marine pistons? I was under the impression that they were the same.
i will definitely have the head worked over!

Thanks for the advice so far!!
 
windvane said:
I take it that the pistons are hard/expensive to find?!
Is there a difference between the automotive and marine pistons? I was under the impression that they were the same.
i will definitely have the head worked over!

Thanks for the advice so far!!
Click to expand...

I for one, would love to know if you're able to find any pistons. Please post results of your search, if you can. Thanks.
 
Your better off looking for a rebuildable shortblock in a wrecking yard and have it rebuilt. Even if you can find pistons and rings the cost with give you a stroke! I'm not sure if the AQ131 is a B21 B23 or B230 block but you can cross reference boat/auto engines to find out. There is nothing marine significant in the short block. Just use your original OHC head with the marine cam if the #4 port is in good shape as Ricardo mentions above. I know the machine shop I use will have a look at it and tell me if they can reuse the original pistons and rods before tearing it apart.
 
film842 said:
I for one, would love to know if you're able to find any pistons. Please post results of your search, if you can. Thanks.
Click to expand...


The machine shop was able to locate a set of pistons, almost $600 for the set.
I am in Alaska so finding a block is very difficult. I asked the shop to sleeve the bad cylinder and hone the other 3.

Thanks for all of the information.

Robert
 
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