Need a better price for manifold and riser
 

I have noticed that I have been losing coolant from the fresh water side of the system and pressure testing shows that the system is not holding pressure. I haven't identified a specific leak but Spareparts posted some notes on this engine a couple of years ago that identified the gasket between the manifold and riser as a common problem. I can't find any external leaks so I pulled the riser off to check the gasket between the manifold and riser. There is corrosion up to the bolt hole closest to the #4 cylinder and that bolt brought most of the threads from the aluminum manifold with it when it came out. I hoped to find only a bad gasket when I took this apart but obviously that was way to optimistic. So now I'm looking for a good price on a manifold and riser. The cheapest I've found so far is $750.00 for the manifold and $150.00 for the riser, plus shipping. Anyone got a line on something cheaper? It seems that this is not a common part anymore and they're expensive.

Not sure which one you have, but these guys had the best prices when I bought parts a few years back for an I/O. There aftermarket parts, but seem to be good quality.

http://www.ebasicpower.com/

I think ther may be a cast iron aftermarket manifold that will replace the aluminum one, I'll check around adn see what I can find. If you can't get anywhere ebasicpower.com, try calling them( I hate their sire), they don't allways have everything on the site. They are very helpfull and may come up with an answer

Found these.

New http://cgi.ebay.com/ebaymotors/Exhau...QQcmdZViewItem

Used http://cgi.ebay.com/ebaymotors/MERCR...QQcmdZViewItem

Do the buy it now on the 2nd one you will be ahead of the game big time!! 8 years ago i did the same job as you for $700 parts also! OUCH

I came up with a zero on the manifold, the risers are available after market

Ouch is right. I just did the buy it now on the used manifold and riser. $210.00 for both as compared to $900.00 for new. I know they won't as long but If I can get a couple of years out of them, I'm good. If something major in the engine or outdrive goes this could become good bracket / outboard project and then I'll be glad I didn't spend The $900.00. Oh well its a boat, this is part of the fun, right?

Thanks, Spare and Ferm for looking

I guess this should be in the repair section, but I started it here so....

In the first shot, the riser is off

Second shot, a close up of the corrosion, this is the bolt that pulled the threads out when removing.

last shot, the manifold is off. You can see evidence of coolant in the #3 & #4 cylinders.

I also had to remove the heat exchanger and re-tap the raw water drain plug hole and install a new drain plug. The old one came apart in the fall when I tried to loosen it to drain the heat exchanger. This was easier with the manifold out of the way. Got the "new" manifold on except for a hole on the heat riser that needs a plug, its ready to start and check it out.

manifold
 

Osco motors usually is about the best call them direct in soudeton pa its otside of phillie you can deal with them direct

coolant leak
 

Hi;;if the 165hp you have is loseing coolant it is proberlly from the water pump cam seals the 165 170 470 motors are famous for this and if it is not corrected it will leak into the oil and destroy the motor... there is a weep hole between the seals and thats where you are probably loseing coolant ,,,looking at the front of the motor he weep hole i located on the left side/front a good way to check is whipe a white paper towl down there if there coolant that your problem ..just google 470 motors (coolant leak) and it will be more detailed....Bksah2

the weep hols is down low on the front of the engine, if it is open, then any coolant that leaks past the first seal will go out the weep hole and alert you that it is leaking before it gets past the second seal, some times the weep hole will get clogged adn you won't know you have a problem till you notice you have water(coolant) in your oil. Its not that big of a problem to fix if it is bad( its not that easy either).

Good job...and THERM, love your WEDDING Pic. Bro. : )-

I'm aware of the possible leak from the water pump pressure testing the cooling system indicated a major leak because the system held no pressure at all and there was no sign of any external leak anywhere. I hope that the waterpump does not turn out to be the new weak link now that the manifold is fixed.

coolant leak
 

Keep a close eye on your oil for water... If the weep hole is blocked and the seals are bad theres only one place for the coolant to go ,,,,in the oil if its cought intime the repair is not to bad ...LETS us know what you find,,,....

Also i would think a nother way to check the seals is to pull the dip stick put your thumb tightly over the fill tube then pump up the system if you can feel prusser building at your thumb its your seals...I am not sure his wil work but i ould give it a try....also the weep hole is a tough nut to find if your cooland is drained down yu may not see any think leaking