pulling wire off #3 plug

[tonycrespo]

Re: pulling wire off #3 plug

also, how could a bad cd module effect another cd module? Could the kill circuit in one effect another?

 

[pnwboat]

Re: pulling wire off #3 plug

I'm not an expert at the electronics, but in the trouble-shooting guides I've read that there is a blocking diode in the Kill Circuit of each module that isolates each module from each other. If it shorts out, the modules are no longer isolated from each other and a problem with one module can affect operation of another.

 

[tonycrespo]

Re: pulling wire off #3 plug

I removed the entire ignition asm. yesterday and while installing the new cd module, I checked every single connection lead and wire. I connected everything up as neat and tidy as I could and when it was all together, I fired it up and low and behold. We have spark on every cylinder. It coughed alittle and I had to adjust carb mixture screws but so far so good. It's raining today so I can get out on the water, maybe tomorrow...

 

[maxum247]

Re: pulling wire off #3 plug

Glad to hear you got it fixed!

max!

 

[pnwboat]

Re: pulling wire off #3 plug

Keep your fingers crossed but you're still not out of the woods yet! Testing out on the lake will determine if it's really fixed, but it looks like you're on the right track.

 

[maxum247]

Re: pulling wire off #3 plug

Keep your fingers crossed but you're still not out of the woods yet! Testing out on the lake will determine if it's really fixed, but it looks like you're on the right track.

I've been trying to ignore that thought all weekend after getting my motor running on all four cylinders recently. I'm a little concerned that's what will happen when I test my boat next weekend, it's gonna be a long week!

max!

 

[tonycrespo]

Re: pulling wire off #3 plug

just back from the lake and yes all 5 plug wires were firing, I have another problem. I suspected another problem so I ran the boat with the cover off and as I opened it up, on the port side, right behind the rectifier, a spray of water was streaming out pretty good, at idle you didn't notice it. It's coming from the big cover that has about 20, 7/16 bolts. What is that and is that easy to replace the gaskets. This could be leaking inside as well causing my miss when I open it up and it can't be good to have water spaying on the rectifier.
Help me friends...

 

[pnwboat]

Re: pulling wire off #3 plug

Sounds like the exhaust cover gaskets are leaking. Probably Item 1 or 4 is leaking in diagram below. Probably also have to replace item 5 too. Hardest part about this is being careful not to snap a bolt off. If you find a stubborn bolt when removing, don't just go hog wild and crank hard to loosen. May have to soak with Liquid Wrench, CRC, PB Blaster or similar product. May also have to heat with a propane torch. Use plenty of anti-seize on the bolts when you re-assemble.


http://www.boats.net/parts/search/Merc2/Force/150%20H.P.%20(1989-1992)/1989-A%20THRU%201992-C/EXHAUST%20MANIFOLD%20AND%20COVER/parts.html

Look at it this way.....this problem is a cake walk to diagnose compared to your last one...LOL! Or at least I hope it's a cake walk!

 

[tonycrespo]

Re: pulling wire off #3 plug

PNW, you are really good. The water is leaking out of #1. But since I'm taking it apart. 4 and 5 make good sense. Could water be leaking into the cylinders from this problem?

Thank You
Tony

 

[pnwboat]

Re: pulling wire off #3 plug

It's possible water could be leaking into a cylinder(s). If it was a significant amount, you would probably be able to see it in the form of very small water droplets on the plugs. I've had really good luck with using Permatex Ultra Grey RTV silicone sealant on these gaskets. Make sure you clean the surfaces really well with some carb. cleaner. Wire brush if necessary. Let it set up for at least 5 or 6 hours at 70 degrees or higher. Overnight if possible. Then test for leaks.

 

[tonycrespo]

Re: pulling wire off #3 plug

parts ordered....

 

[tonycrespo]

Re: pulling wire off #3 plug

PNW..... how do I get at the lower 8 bolts?
Please don't tell me I have to pull the power head out.

 

[pnwboat]

Re: pulling wire off #3 plug

No, you shouldn't have to pull the power head. Might be able to get at them with a 1/4 inch ratchet and a real skinny hand. If not, you can try unbolting the lower cowl (the part that the hood sets on) and shifting it over to one side to get more room. I believe there are 12 or 14 bolts that hold it in place. They're relatively easy to get to. Just be very careful and don't drop them. Other wise you have to take the rear cover off of the drive shaft housing to retrieve them. Six bolts hold the rear cover on the drive shaft housing. Easy to get to. I've dropped screws, bolts and had to remove the rear cover on occasion.

 

[tonycrespo]

Re: pulling wire off #3 plug

PNW, your suggestion to move the cowling over to one side did the trick. I have been able to remove the exhaust manifold and cover, not without snapping off 2 bolts. One on the outside perimeter of the cover and the very bottom one that seals around the lower exhaust port. That will be the challange to remove. There is about 1/4 inch of bolt sticking out that I may be able to grab on to. I sprayed them with WD40 and I'll try heat.
Upon inspection to see if water was infact getting into the cylinders, I did notice in the upper exhaust port for cyl 1 and 2 and whiteish gooie type spot about the size of a half dollar that is a sign of water and oil mixing right?
your thoughts

 

[pnwboat]

Re: pulling wire off #3 plug

Yes it sounds like water was leaking. Doesn't sound like much though. You should be OK.

Removing broken bolts can be a real pain. Usually heat and vise grips work if you can get a good grip on the bolt without tearing it up. WD40, and tap it lightly to try and break the corrosion that has it bound up.