risers on a closed cooling system

rasbury

So, in my journey of pulling the motor to investigate a leak, I learned that my motor is not a 1/2 closed cooling, it is 100% closed cooling which is what I thought I had purchased and sought when I went looking. Somehow, someone convinced me I did not. Anyway- so the raw water only cools the heat exchanger and then a hose goes over to the riser and then out the boat correct? So I pulled them off to get the exhaust elbows apart removing the motor and under the boot is heavily corroded. Obviously was concerned - but thinking it through, does it really matter? Raw water is not going anywhere except out with exhaust- do I really need to replace them?

Handymans342

They are a wear item especially in salt water. If they are original, just replace. As a matter of fact, why dont you just drop in a new motor and drive while your at it LOL

rasbury

That would be nice! My motor has 300 hours on it, said it had 100 when we bought it if that is to be believed. It does run good.

reneechris14

Take a look at some new ones, so you can see how much materail there is. Then make a decision.

rasbury

I'm replacing...

reneechris14

I endoscoped my flaps today I should of tried go up more to see my exhaust elbow.

rasbury

One side of mine were gone. I had to cut off the y pipes to get it apart...

212rowboat

Do you have wet joint or dry joint exhaust?  Wet joint are dirt cheap... Dry joint considerably more.. But theyre just risers, and easy.... 

You want that raw water spit into the exhaust stream where its intended... If it wears and deteriorates allowing passage straight down into the exhaust manifold it can be pulled back into a cylinder... No bueno.  

rasbury

I assume dry- take a look at this picture. I'm looking on marinegines. com for parts by serial number and they show an o1 and an 02. Not sure what the difference is, one says ceramic coated but is the cheaper. Ebay has the 02 part for 180 bucks! Would I need to replace the risers also? They really just don't look that bad. 

864309T01 - Exhaust Elbow

https://www.ebay.com/itm/Dry-Joint-Exhaust-Elbow-Riser-for-Mercruiser-Marine-Engine-Manifold-864309T02/131534304019?hash=item1ea00e3313:g:brUAAOSws0Jahb30&vxp=mtr

212rowboat

Yup.., those are dry.  Its up to you.  It'll never be easier, but theyre not that bad in the boat either, in a few more seasons .

rasbury

So I'm looking at this web site to get pricing and part numbers for the elbows- they show two different ones, a -01 and-02...they don't offer what the difference is. This is checked with my engine serial number....any idea what the difference would be? Item # 13...  http://www.marineengine.com/parts/mercury_marine_parts/sn/0W038097/444207HRS/8093_170

Willhound

Left and Right?

rasbury

well, was wondering about that.... on this site, https://public-mercurymarine.sysonline.com/Default.aspx?sysname=NorthAmericacompany=GuestNA_KEY=NA_KEY_VALUElangIF=englangDB=eng which is the quicksilver site, says the one in blue is a superceded part, but I would think the 02 would be the newer part, not the 01?...but your right, there would have to be a LH and RH pard willhound....I think, will have to look. They have different stuff bolted to them, but, they may be set up the same for either side!

rasbury

nope, they are universal....the quicksilver site says one supersedes the other...

rasbury

the 01 part ebay shows very few...the 02 they are pretty cheap. I assume my boat came with the old part, lasted since 2005 so I'm guessing if I get the same, I might be dead before I need to replace it again!

rasbury

and they are universal...