200 Black Max Low Water Pressure

[TNRoostertail]

Gotcha, yeah it needed a water pump kit and he prob just skipped that lol. Were located a poppet kit and new stats, going to get those in this afternoon then report what we find. Just trying to get the ole gambler back fishing while we spruce up the promax.

[TEXAS20225]

Yes thats what i was getting at no disrespect intended as its very common for someone to not be able to cure a heating problem so get rid of it pass it on. i remember once i built a 200 efi that just would not cool off matter what i did and i sold the motor before i knew it would not cool off. the guy brought it back and i completely disassembled the motor down to bare block put it back together twice i wound up giving the guy his money back it set for about a month after i reassembled it then a guy from Oklahoma bought it but he had his own lower unit and this was sold as power head i put it on for him and never heard from him again till 4 years later when he sold it to a guy and the new owner called me asking what all was done during rebuild. i never found out what made it heat up it was different mid section and lower unit though the two things i had eliminated from the search Go figure

[TNRoostertail]

Lol right on tex, I have had engines like that. Rebuilt a kz1000 once and could not get that rascal to keep time. Used solid cct's tried everything. Sold it to a guy and turned out factory sent me the wrong chain lol. That taught me to start counting my links. And I didnt take your comment as disrespectful at all my man. I appreciate any info you can lay down.

[TNRoostertail]

Ok guys, installed new poppet kit, new stats. Water pressure did go up as the water pressure gauge is now holding about 2.5 at idle. But we noticed water leaking out of the motor mount. My gut tells me all the water isn't making it into the engine from the pump. Here is a video for you guys.
https://youtu.be/EVLrd1fy5XI

[TNRoostertail]

More pics, looks like water is getting all in the driveline.

[Merc 2.5]

2.5 at idle is fine. sounds like u got that part. Now time pull power head , new adapter plate gaskets and use little sealant round the mounts , sumbody has had powerhead off , maybe they put solid mounts in and didnt seal good

[Merc 2.5]

Split the plates clean EVERYTHING new gaskets and sealant round mounts. U b gud. Check lower crank seal n bottom of block. Make sure its ok to

[TNRoostertail]

Took the adapter plate off and found rtv under the gasket. This may be the leak, the gasket was bubbled up all over.

[Merc 2.5]

Ya looks like sumone Putin solid mounts. Solid mounts have a tendency not to seal good and leak , I had take mine back apart for same reason after I installed em. U will always have some water come out exhaust relief in mid but It prob wont b that much if everything sealed good , so dont freak if keeps blowing water out

[Motv18]

Might want to inspect the lower crank bearing. Check the one way lip and such for blowout and in that area for corrosion.

It shouldn’t do anything but if pressure got high enough water can force itself into weird spots.

[Merc 2.5]

It may just b pic but r those the same size?

[TNRoostertail]

Yeah there the same size, they are completely coated with rtv. Were cleaning them now, there is rtv everywhere. So just to make sure, I just need to put rtv around the outside sealing surface of the mounts? Not actually coat the mount right? Thanks guys.

[TNRoostertail]

Here is the gasket. Has rtv all over it.

[Merc 2.5]

Just a small thin bead around front and back of the mount, that way when plate goes on , the rtv will touch alway around. But dont need coat whole thing. Do a dry fit 1st tho and make sure everything its bolting up nice and square. Other than mounts. everything else should go back together dry , so u dont take risk suckin all that junk up in a passage. Clean clean clean, if u got big piece glass and sandpaper. I'd do figure 8s on it with the plates ,

[TNRoostertail]

Right on, good info merc. I am cleaning everything up, I k ow this is just a "get by" motor but I cant stand it not being right. Probably didnt have to but I'm cleaning up mounts and everything. Here is a before and after of the mount so you can see how.much crap was on them. Idk how in the world you could bolt this back up and think everything would be ok.