Mercury xr4 black Max 150 has water in bottom left cylinder

[bassin89]

I first noticed the issue when my boat started running rough . I pulled all of the spark plugs and noticed the bottom left one was a lot cleaner than the others And also had water droplets on it. After this I pulled the head to check for cracks or maybe a blown head gasket, but everything appeared normal. What else could be causing this issue? Any help would be greatly appreciated

 

[b.gagnon]

Re: Mercury xr4 black Max 150 has water in bottom left cylinder

Rotted water jacket?

 

[Dukedog]

Re: Mercury xr4 black Max 150 has water in bottom left cylinder

If head gaskets were good, go to tha divider plates. Check "both" gaskets. Clean both pieces and check for crack and/or small hole. Especially tha inside piece.........

 

[bassin89]

Re: Mercury xr4 black Max 150 has water in bottom left cylinder

Thanks I'll check that out this afternoon

 

[bassin89]

Re: Mercury xr4 black Max 150 has water in bottom left cylinder

Well it turns out that there's a small hole in the divider itself, is there any way to repair this or will it have to be replaced?

 

[Dukedog]

Re: Mercury xr4 black Max 150 has water in bottom left cylinder

Here ya go.............

Brand New Mercury Exhaust Plate Divider 99169A1 1976 1990 150 175 200 HP V6 | eBay

 

[bassin89]

Re: Mercury xr4 black Max 150 has water in bottom left cylinder

Thanks but mine is actually different than that one

 

[Dukedog]

Re: Mercury xr4 black Max 150 has water in bottom left cylinder

What year? Is yours one piece with a water cooled regulator?

 

[bassin89]

Re: Mercury xr4 black Max 150 has water in bottom left cylinder

I'm not sure of the year but the serial number on it is 4734103 if that helps

 

[Dukedog]

Re: Mercury xr4 black Max 150 has water in bottom left cylinder

Not a good number. Should be something like 0Bxxxxxx, 0Cxxxxxx unless its a "replacement" block. Merc stopped numbers only serial numbers long before tha XR4 came about. Is tha divider plate made up with two pieces or is it just one piece?

 

[bassin89]

Re: Mercury xr4 black Max 150 has water in bottom left cylinder

Two piece, that serial number came off the plate where the motor joins the transom

 

[Dukedog]

Re: Mercury xr4 black Max 150 has water in bottom left cylinder

Powerhead has been replaced more than likely. Is your trim pump in tha boat or on tha clamp bracket itself? They started tha 0 whatever about tha same time tha trim changed. What is different with tha one on ebay compared to yours?

 

[bassin89]

Re: Mercury xr4 black Max 150 has water in bottom left cylinder

It's In the boat. Mine has a single square hole at the top that the water flows into

 

[Dukedog]

Re: Mercury xr4 black Max 150 has water in bottom left cylinder

Any way you can put up pictures of tha power head? That may describe a VERY early first generation block V6.....Which would go with tha serial number.

Also gotta ask. Where did you get tha XR4 designation?

 

[bassin89]

Re: Mercury xr4 black Max 150 has water in bottom left cylinder

From the cowling, and it says black Max on each side of the lower unit where it joins to the cowling

 

[Dukedog]

Re: Mercury xr4 black Max 150 has water in bottom left cylinder

Gonna need some pictures. Don't think its an XR4. Think its just a later model cowlin'.............

 

[Dukedog]

Re: Mercury xr4 black Max 150 has water in bottom left cylinder

If you still have tha heads off measure tha bore. 3 1/8? 3 3/8's?

 

[bassin89]

Re: Mercury xr4 black Max 150 has water in bottom left cylinder

 

[bassin89]

Re: Mercury xr4 black Max 150 has water in bottom left cylinder

unfortunately the heads already back on

 

[Dukedog]

Re: Mercury xr4 black Max 150 has water in bottom left cylinder

First generation motor. Probably '76 ta '78 somewhere. Serial number is probably power head right. Nothin' I have with me will show tha serial number so doin' this from my old *** memory. That piece might be hard ta find.............