200 Black Max Low Water Pressure

**TNRoostertail** · 11-13-2019, 07:03 PM

Just fyi, were using the buzzer and trying to put a hand on the hands to judge temp right now. At idle before we go out you can hold your hand on the head. After the buzzer sounds you cannot hold your hand on the head. Also it overheats very quickly, I would say 10-15 seconds after the hole shot it gets too hot.

**Merc 2.5** · 11-13-2019, 07:57 PM

Ya laser work fine

**TNRoostertail** · 11-13-2019, 08:12 PM

If we give up on this motor whats it worth to sell? We would be forthcoming with the overheating issue. Were just trying to get the gambler back in the water and now we have 2 engines with problems because the seller wasnt forthcoming.

**Capt.Insane-o** · 11-14-2019, 12:38 AM

At this age it should have had new head gaskets anyway, but 143 is very warm to the touch.

**TNRoostertail** · 11-14-2019, 12:41 PM

Yeah its warmer than that cap lol.

**TNRoostertail** · 11-14-2019, 06:10 PM

Ok so we finally caught the villain infesting the 2.4. We knew everything was right cooling wise so we took a deep breath and dropped the heads. We started to shoot it with a thermometer but knew there was nothing left but something inside the block. Two cylinders have bad discoloration and those pistons are starting to pit from heat soak. I believe the guy who put the engine back together with the wrong adapter plate must have not had an engine alarm and drove it like this for a little while or just ignored the alarm. So this motor needs rebuilt too. Lesson learned, anytime we buy any other engines a thorough evaluation will take place before we purchase. Wish more people would use manuals instead of just throwing things together. We managed to find a decent older 2.4 powerhead were going to look at to try and get us by while the promax is getting built. We will do a full compression test and thermal scan. I want to thank everyone for their help. We learned a lot from this little endeavor that will make future troubleshooting and engine buying easier for us. Plus we can now jerk a powerhead in less than 10 minutes lol.

**Merc 2.5** · 11-14-2019, 06:16 PM

I agree sumthin wrong. The pitting is normal for chrome bores

**TNRoostertail** · 11-14-2019, 07:16 PM

Originally Posted by Merc 2.5

I agree sumthin wrong. The pitting is normal for chrome bores

Merc you were solid help through this thing man, we really appreciate it. I have built quite a few 4 stroke automotive engines so i can figure a few things out, but there are some key differences. Live and learn a lot lol.

**Capt.Insane-o** · 11-14-2019, 07:32 PM

Bores have pits or are the piston tops eroded? Chrome motors always have pits.

**TNRoostertail** · 11-14-2019, 08:39 PM

Originally Posted by Capt.Insane-o

Bores have pits or are the piston tops eroded? Chrome motors always have pits.

Piston tops are eroded, but from a metallurgy stand point they look like they got a little hot. Plus there is discoloration in 2 cylinder walls, very dark gray coloring.

**Motv18** · 11-14-2019, 11:13 PM

With the water working, it was probably lean, dubble check the color isn’t ashy stained. But physical damage pretty much ends it till a piston swap

good of luck on getting her going.

**TNRoostertail** · 11-15-2019, 08:18 AM

Originally Posted by Motv18

With the water working, it was probably lean, dubble check the color isn’t ashy stained. But physical damage pretty much ends it till a piston swap

good of luck on getting her going.

Well the water wasnt correct when we got it, and the guy ran it quite a bit that way. Were estimating that's what created the hotspots. It's a shame to because it was exploding out of the hole and running like a 225.

**rochelle howell** · 11-15-2019, 10:51 AM

Did your block water diverters look to be in o.k. shape and in the right spots when you pulled the heads?
If it's not too much to ask, could you shoot a couple pics of your discolored / pitted chrome bores and diverter shape / locations in block? Thanks!

**TNRoostertail** · 11-15-2019, 11:01 AM

Here yah go, the camera isn't quite clear enough on some pics. In person you can definitely see the discoloration where the chamber was getting hot.

**TNRoostertail** · 11-15-2019, 11:05 AM

This engine was supposed to be in "good" shape. Guy said he just put it back together etc... We learned to always do a full work through from now on unless purchasing new or from a verified source. This engine was just meant to "get us by" while we rebuilt the promax. This engine was also 1500 bucks, and that's a good price imo for an older 2.4 that's running good.