Exhaust Elbows

[rickasbury]

Well, about to the end of my saga, transom assembly is back on my Rinker 270 with no leaking so ready to put my motor back in. I'm closed cooling on my 350 MPI motor. The risers really do not look bad at all, very minimal corrosion. On the elbow, where the boot goes over is badly corroded and crumbling so I know I have to replace those. I have my serial number for the motor,

OW038097 but when I go on one of the MercuryEngine....com web site, it lists several so I'm not sure which one is correct. Think I'm good on the risers? Not sure why right there under the boot it is so bad...it.s 2006 and I'm sure have never been replaced.

 

[achris]

2006 and never been replaced... Replace them. They'll be dry-joint, so make sure you get the right elbows.

Your engine (by serial number) is a 350 MPI, Horizon, 3" with a Bravo drive. 3" means 3" risers under the elbows.

The right elbows are -864309T02. The gaskets, for closed cooling are 27-864549A02 (block-off) and 27-864547A02 (full flow). But I'd need to know if you have 'warm' or 'cold' risers before I can advice which gasket goes where. Or you can just note which one is where as you disassemble.

Chris........

 

[rickasbury]

Thanks Chris- Here are some pictures so maybe that will help...sure don't want to buy the wrong stuff that's for sure. 3" on the risers sounds about right...

 

[achris]

Cold risers... Block off gaskets on the manifold, full flow between the top of the riser and the elbow.
But make sure you clean those surfaces up properly. I use a wooden brickies float with a length of fine emery on it.

Chris........

 

[rickasbury]

I'm looking at replacement on both aren't I Chris?

 

[achris]

Exhaust components like that should be replaced in pairs, yes.

 

[rickasbury]

so achris just to make sure i understand....I need both of the gaskets you listed above...one is a block off and the other full flow....correct?

 

[rickasbury]

and also, I did not see a part number for the risers on my parts list I was looking at...

 

[achris]

and also, I did not see a part number for the risers on my parts list I was looking at...

If you what to replace the 3"risers, they only come in the kit, which includes both the gaskets. -864929A4

Chris.....

 

[rickasbury]

OK, hold the presses here.....you pretty much advised my I needed to replace the risers....I'm looking at them and I was just getting ready to look at the cooling system flow diagrams - there is no water that goes through them correct? And no water goes through the manifolds correct? I'm really not trying to cheap out here ( well maybe a little) but if I can clean them up and reuse them, without fear of a major service problem, then that's the way I would go. I know the elbows are trash and have to go. The risers look like they can be cleaned up to me. I have the old gaskets so that matches up to the info you have provided. Let me know your thoughts achris .

 

[rickasbury]

https://www.ebay.com/itm/PAIR-OF-ME...68494f811:g:cCsAAOSwBLlU4nJ2&autorefresh=true

 

[achris]

OK, hold the presses here.....you pretty much advised my I needed to replace the risers.... .

No. I advised you that the ELBOWS need to be replaced, and gave you part numbers for those and the required gaskets. YOU then said you didn't see part numbers for the RISERS. I provided that number. And the information that the riser kit contains the required gaskets.

Chris....

 

[achris]

...I'm looking at them and I was just getting ready to look at the cooling system flow diagrams - there is no water that goes through them correct? And no water goes through the manifolds correct? .

Incorrect. Water does flow through both the risers and the manifolds. But because you have closed cooling, seawater flows through the risers and elbows and coolant flows through the manifold.

Chris...

 

[rickasbury]

You do recommend replacing the risers also, correct?

 

[achris]

If they look like they need replacing, replace then. Of they look ok, and will clean up, clean them and reuse them.

 

[rickasbury]

so what is the brookies float???

 

[achris]

so what is the brookies float???

:laugh::laugh: Brickies (short form for 'bricklayer') float.....

I loosen the handle screws, tuck one end of a length of fine emery (about 160 grit) under it and tighten that screw. Pull the emery tight and around and push it under the other end of the handle, and tighten that screw. Perfect flat surface cleaner.




Chris........

 

[rickasbury]

ah, good idea...I have 10 of them in my shed! Boy, looking for other than big dollar from Merc elbows is pretty frustrating...just when you think you have a deal on something a zinger!

 

[rickasbury]

One company I found sells a "kit" to convert the dry joint to a wet joint....I see the difference but don't really understand the difference but that is ok....why would you want to do that?

 

[achris]

Going from dry joint to wet is a big backwards step. Don't do it.

Have a look at HGE as an alternative.

Chris...