92 Mariner 150 Idles, but no power on High

[1992ProCraft]

Re: 92 Mariner 150 Idles, but no power on High

Hello, have been reading post, and honestly getting aggrivated.

Everyone is trying to figure your problem out.

START WITH COMPRESSION TEST submit results.

CHECK SPARK AT THE SAME TIME WITH A SPARK TESTER, submit results.

THIS IS HOW YOU DIAGNOSE

IF YOU JUST WANT TO THROW PARTS AT IT PUT A MAGNET ON THEM

Please let them help you and follow their requests, It is FREE HELP an they are looking for the cheapest and the correct sollution for you.

<WHEN YOU GO TO THE DOCTOR THEY DONT START WITH BRAIN SURGURY THEY DO TESTS FIRST>

Well, Santa Claus brought me a bad gift this year...Just checked compression and all cylinders are at 120 for the exception of the upper right (looking from the rear)...that one reads 40.

 

[DuckOfDeath]

Re: 92 Mariner 150 Idles, but no power on High

Well, Santa Claus brought me a bad gift this year...Just checked compression and all cylinders are at 120 for the exception of the upper right (looking from the rear)...that one reads 40.

Ouch! Sorry to hear that, man. Technically, this gift was given back in September. But you did get a sweet new DVA meter for x-mas. Now, you just need to do this repair yourself to have any chance of needing that meter anytime soon.
Doooo eeeeet!

And remember the lesson of proper troubleshooting procedure. The steps are laid out in a logical order to prevent the expensive alternative that is speculation.

 

[1992ProCraft]

Re: 92 Mariner 150 Idles, but no power on High

Ouch! Sorry to hear that, man. Technically, this gift was given back in September. But you did get a sweet new DVA meter for x-mas. Now, you just need to do this repair yourself to have any chance of needing that meter anytime soon.
Doooo eeeeet!

And remember the lesson of proper troubleshooting procedure. The steps are laid out in a logical order to prevent the expensive alternative that is speculation.

Yeah, pretty much blows. On a lighter note, when the motor went out I was on the way back from having a very succesfull date (chic pow pow on the lake, LMAO). Now I need to figure out if I'm going to get rid of the boat or fix it myself. I've done several motors back in the days, but never two-strokes. What are we talking about? Remove the head, rehone, new rings? Do I have to do both sides for balance? Could it have something to do with the reed valves? I'm used to regular valves on a 4 stroke, but clueless on 2-strokes. Still surprised at what could have caused that particular cylinder to burn, and at the same time lose the regulators and possibly something else. BTW, thanks to all who helped out.

 

[j_martin]

Re: 92 Mariner 150 Idles, but no power on High

Yeah, pretty much blows. On a lighter note, when the motor went out I was on the way back from having a very succesfull date (chic pow pow on the lake, LMAO). Now I need to figure out if I'm going to get rid of the boat or fix it myself. I've done several motors back in the days, but never two-strokes. What are we talking about? Remove the head, rehone, new rings? Do I have to do both sides for balance? Could it have something to do with the reed valves? I'm used to regular valves on a 4 stroke, but clueless on 2-strokes. Still surprised at what could have caused that particular cylinder to burn, and at the same time lose the regulators and possibly something else. BTW, thanks to all who helped out.

You usually lose that one with lack of cooling. That would also stress the electrics.

2 strokes have half the parts that a 4 stroke has. You're not engineering the thing, just replacing parts.

You have to do things right, but if you do they are pretty simple and even somehwhat forgiving. It's common practice to sleeve one cylinder, or bore it oversize, and just re-ring the rest.

It's well worth fixing fer sure.

hope it helps
John

 

[1992ProCraft]

Re: 92 Mariner 150 Idles, but no power on High

You usually lose that one with lack of cooling. That would also stress the electrics.

2 strokes have half the parts that a 4 stroke has. You're not engineering the thing, just replacing parts.

You have to do things right, but if you do they are pretty simple and even somehwhat forgiving. It's common practice to sleeve one cylinder, or bore it oversize, and just re-ring the rest.

It's well worth fixing fer sure.

hope it helps
John

Now that you mention cooling, earlier this year the alarm went off due to temp...I shut it down quickly and trolled back. Come to find out I lost the water pump, which I replaced. That must have weakened that particular cylinder. When I bought the water pump I also ordered thermos, but never replaced them.

I really didn't look in the manual, but by looking at the motor it seems pretty simple to get to everything. My guess is that I'll need to order a new head gasket...now, do the pistons rub against the head via ring and sleeve, or just ring on head. I'm also assuming I'm going to need a ring compressor.

Like you say, it may be worth fixin myself, as long as it doesn't break the bank.

 

[j_martin]

Re: 92 Mariner 150 Idles, but no power on High

Now that you mention cooling, earlier this year the alarm went off due to temp...I shut it down quickly and trolled back. Come to find out I lost the water pump, which I replaced. That must have weakened that particular cylinder. When I bought the water pump I also ordered thermos, but never replaced them.

I really didn't look in the manual, but by looking at the motor it seems pretty simple to get to everything. My guess is that I'll need to order a new head gasket...now, do the pistons rub against the head via ring and sleeve, or just ring on head. I'm also assuming I'm going to need a ring compressor.

Like you say, it may be worth fixin myself, as long as it doesn't break the bank.

It'll take a complete gasket set, and some special tools. This time pay attention. Get the Mercury manual if you don't already have it, and look over the power head overhaul procedures to see what you'll need.

Procedures and parts differ depending on what you have and what you need to do. That can only be determined after you tear it down and examine the parts.

hope it helps
john

 

[1992ProCraft]

Re: 92 Mariner 150 Idles, but no power on High

It'll take a complete gasket set, and some special tools. This time pay attention. Get the Mercury manual if you don't already have it, and look over the power head overhaul procedures to see what you'll need.

Procedures and parts differ depending on what you have and what you need to do. That can only be determined after you tear it down and examine the parts.

hope it helps
john

I took a look at the manual and it's a bit more complicated than I thought. I though it could be replaced without having to pull the power head. It looks like I'll have to remove everything, pull the power head, and work on it from there. Much easier in cars.

 

[hawgherder]

Re: 92 Mariner 150 Idles, but no power on High

I work using the KISS principle. Remove the cylinder head before doing anything else and see if you can see any damage to that cylinder. You may just have a bad head gasket. If you do the spark plug will be really clean in MOST cases. If you don`t have a pressure gauge own your engine get one. Low compression and burned regulators probably not related. The switch boxes are more directly related to each individual cylinder. I wouldn`t jump into any major work until you have done the easy stuff.

 

[j_martin]

Re: 92 Mariner 150 Idles, but no power on High

Now that you mention cooling, earlier this year the alarm went off due to temp...I shut it down quickly and trolled back. Come to find out I lost the water pump, which I replaced. That must have weakened that particular cylinder. When I bought the water pump I also ordered thermos, but never replaced them.

I really didn't look in the manual, but by looking at the motor it seems pretty simple to get to everything. My guess is that I'll need to order a new head gasket...now, do the pistons rub against the head via ring and sleeve, or just ring on head. I'm also assuming I'm going to need a ring compressor.

Like you say, it may be worth fixin myself, as long as it doesn't break the bank.

Judging from your questions, you need to carefully study the manual.

hope it helps
john

 

[1992ProCraft]

Re: 92 Mariner 150 Idles, but no power on High

Well, the damage is more severe than I had imagine. Pulled the head and a chunk of metal got in the cylinder and scared the head, cylinder, and block. Not sure what the debris is, but I'm guessing some sort of needle bearing or something. See pics...

 

[CharlieB]

Re: 92 Mariner 150 Idles, but no power on High

Curious to see the other cyl's and the rest of that head. It is obvious that you already cleaned the flat surface of the head but from the cleanliness of the combustion area, it appears that the cyl was beginning to run slightly lean, yet the piston does not appear melted.

The metal pieces look like the piston ring expanded, snagged the exhaust port and broke.

There is a lot of aluminum from the piston smeared on the cyl wall that will need to be cleaned off before you can guage the cyl damage, it MAY be possible to replace the piston and rings, depending on the cyl damage after cleaning.

You may want to replace the head. If you elect to re-use that head be SURE to pick out EVERY piece of that broken ring and smooth the sharp edges of the remaining 'pockets' left by those pieces. It is NOT really recommended to re-use a damaged head for the possibility of carbon deposits 'glowing' and possibly causing premature ignition of that cyl leading to repeated failure of that piston.

You may have to bore the cyl and go with the next oversized piston/ring. It is acceptable to bore just one hole and not adversely affect engine balance.

CLEAN CARBS, rebuild fuel pump, and install a new water pump kit to be sure all goes well once the engine is finished.

 

[Dukedog]

Re: 92 Mariner 150 Idles, but no power on High

Looks like a ring pin. Get tha piston out and see if both ring retainer pins are still in tha piston. Might have just broke tha pin 'cause they are longer than tha impression. So are any of needle bearings. Check all tha port edges for nicks and/or abrasions.................

 

[j_martin]

Re: 92 Mariner 150 Idles, but no power on High

Well, the damage is more severe than I had imagine. Pulled the head and a chunk of metal got in the cylinder and scared the head, cylinder, and block. Not sure what the debris is, but I'm guessing some sort of needle bearing or something. See pics...

That ain't bad. You can't even see the connecting rod yet.

Seriously, we've seen a lot worse get by with a piston and a set of rings. Depends on the condition of the cylinder wall after the aluminum is cleaned off it.

If you do bore it out, be sure to have someone that specializes in marine engine boring do it, even if you have to ship the block somewhere.

 

[sschefer]

Re: 92 Mariner 150 Idles, but no power on High

Someone said that a blown rectifer and an overheat were not related when in reality they can be. Merc ran wiring over the top of the cylinder and when the engine overheats it often burns through. This can short out the advance module, the rectifiers/regultor(s) and even the trigger. The result is a cylinder looking pretty much like yours does.

None of that really matters at this point. Your best bet is to either find a good long block or get another engine. You could rebuild it yourself if you want to learn what makes these things tick but you'd spend about the same amount of money.