73 Merc 1150 2 stroke 6cyl Distributor

[stbiblecg]

I have a 73 Merc 1150, just bought. Engine was not getting spark so I dropped the distributor cap and the rotor was shattered. i am getting ready to order one I found for $200 (after searching for 5 days).

I also have a 73 65HP Merc 4cyl 2 stroke I was curious if i could use the shaft and rotor out of this one even though it is a 4 cyl?

If not, does anyone know how to dissasimble the distributor? I got it off pretty easy but can not figure out how to take apart to change shaft and rotor. I am trying here before I purchase and have to WAIT for a manual. I am ready to get this boat on the water.

I guess if nobody know's the marina down the road from me wants $85 an hour labor to change it and they said around 2 to 3 hours. Would it be worth it just to have them do it? Is it as big of a pain as everyone say's?

Thanks for any information...
Tim

 

[Chris1956]

Re: 73 Merc 1150 2 stroke 6cyl Distributor

I used a distributor from an Merc 850 IL4 in my Merc 1500 IL6. If the distributors are nearly identical, it should work. The very outer casing of the two distributors (mostly the economizer collar and bolt up flange) were different, so I had to swap them. They are a bit tricky to take apart. There is a nut on the rotor shaft that needs to come off. You need a manual,. IMHO. You obviously need to change the rotor disk to the 6 window one.

 

[stbiblecg]

Re: 73 Merc 1150 2 stroke 6cyl Distributor

Awesome, thanks for the info! I took the distributor off the 65 today and held it next to the 115 and it was exactly the same, bolt holes and everything. However, I found a new shaft and rotor online for $200...(new) after shipping and everything, I ordered it yesterday and a marina wants $85 an hour to install it. He said approx 2 hours. I don't have a manual and really don't want to wait for one so I am highly considering just takin the hit and paying to have it put in.

Another question do you know why or how that rotor would have shattered. When I bought it the guy said it ran perfect last year then just quit and could not get spark. When I dropped the dis. cap the rotor was in a thousand pices. It does look ceramic but I did not think that could just happen for no reason? Any theories?

Thanks again first reply for my first post was hoping someone would be able to help!

Much appreciatted!
Tim

 

[asm_]

Re: 73 Merc 1150 2 stroke 6cyl Distributor

Look at CDI web site for the trigger replacement instructions. It's not diffcult to do. I just did one on 74 850 4 cyl. It took about an hour.

If you decide to do it your self, ask question here with picture.

B

 

[stbiblecg]

Re: 73 Merc 1150 2 stroke 6cyl Distributor

awesome thanks for the info

 

[stbiblecg]

Re: 73 Merc 1150 2 stroke 6cyl Distributor

well figured out all the problems the rotor disc was not in the distributor at all, now only if I could figure out how to get it on

 

[asm_]

Re: 73 Merc 1150 2 stroke 6cyl Distributor

well figured out all the problems the rotor disc was not in the distributor at all

I'm not sure what you mean by that. Was the rotor disc lose on the shaft, or it's not even on the shaft?

B

 

[stbiblecg]

Re: 73 Merc 1150 2 stroke 6cyl Distributor

no the rotor disc was no where to be found not on the shaft not down in the engine housing...no rotor disc what so ever had to go buy one for $15 put it all on which turned out to be quiet easy then finally got spark to all the plugs, then had to take off the carbs and clean them now the priming bulb has air in it the middle carb is filling up with fuel then leaking out and the bulb never gets hard. I can get it started off of starter fluid but definatly have a feul prblem/ carburator problem.....SSSSSSSSSUUUUUUUUUCCCCCCCCCCCKKKKKKKKSSSSSSSS!!!!
Lol

boats are so expensive and time consuming

 

[CV16]

Re: 73 Merc 1150 2 stroke 6cyl Distributor

Do yourself a favor. Instaed of starting fluid, fill a spray botle with 50:1 gas. You'll ruin your engine with starter fluid, it washes away all the oil in the cylinders. I'd clean all the carbs, and also rebuild the fuel pump(s). When I took my carb off, I also replaced all the rubber hoses with new. The old ones weren't made to stand up to the blended fuels most of us are stuck with now.

 

[stbiblecg]

Re: 73 Merc 1150 2 stroke 6cyl Distributor

I just took what I believe to be the fuel pump off, it is a pressure fed system from what I read since the hoses going to the carbs go into the tops of the bowls. I took the pump apart there is a diaphram in the middle (no holes) seems really clean the top peice has a spring with a cap on it 2 hoses in the bottom 2 out the top. Is there a way to tell if this is bad because when I pump the bulb it gets hard then when I turn the engine over the bulb goes completly soft again.......like nothing in it at all. Just from my mechanical common sinse I would believe this to be the problem or maybe the carbs, yet I am leaning away from it being the carbs beings I spent the last 2 days cleaning them inside and out. Why does everyone say fuel pumpS is there more than one? If it would help I could take a pic of it and post it..

Thanks again for all the help...very very much appreciatted!

 

[stbiblecg]

Re: 73 Merc 1150 2 stroke 6cyl Distributor

Also is there a way to test if the engine is bringing enough vacuum into the pump to send fuel to the carbs, maybe like putting an air hose into the vacuum line to see if there is a leak somewhere with a little soapy water test on the crankcase. Not to sure if I am right just going off of what I have read on some other sites?
Thanks Tim

 

[asm_]

Re: 73 Merc 1150 2 stroke 6cyl Distributor

If the primer bulb goes flat after engine is run for a few minute, the problem is not your fuel pump. The problem is some where between the primer bulb and the fuel tank. Or dear I ask, did you open the fuel tank vent??

 

[stbiblecg]

Re: 73 Merc 1150 2 stroke 6cyl Distributor

lol, yes the vent is open i have check everything from the engine to the tank and it does not go flat while running it will not start unless i spray fuel in when i turn it over it goes flat again...not flat but empty if you know what i mean it is not sucking it flat, but the engine will not start unless i really pump the bulb spray starter fluid in etc. i don't think there is good enough vacuum to take fuel from the pump to the carbs??

 

[asm_]

Re: 73 Merc 1150 2 stroke 6cyl Distributor

i don't think there is good enough vacuum to take fuel from the pump to the carbs

First, the flow of fuel from fuel pump to carbs is not by vacuum, but rather pressure generated by fuel pump.

I still think the problem if between the primer bulb and the fuel tank if the primer bulb goes empty after a few minutes of running.

 

[stbiblecg]

Re: 73 Merc 1150 2 stroke 6cyl Distributor

but the bulb does not go empty after a few minutes of running it goes empty if you bump the engine over for 1/2 a second, please explain to me how the pump works then because i really don't understand because other people were saying the 2 lines that go into the bottom of the pump coming out of the engine were vacuum lines, if there not then i have no idea how it works if it is not vacuum or electric????


if you were me what would you do to troubleshoot because i am running out of ideas...i have the pump lyin on my workbench right now with the pump off the primer bulb pumps fluid out perfect stream if i hold my finger over the end of the hose it will stay hard.

 

[Gomer50]

Re: 73 Merc 1150 2 stroke 6cyl Distributor

You might want to check one more thing,On mine I found the quick disconnect from the motor and the fuel line was sucking air.

 

[stbiblecg]

Re: 73 Merc 1150 2 stroke 6cyl Distributor

oh damn thats a good one

 

[stbiblecg]

Re: 73 Merc 1150 2 stroke 6cyl Distributor

ok, so I went out and desided to dig a little deeper....i replaced the entire line from the tank to the fuel pump including quick disconnect and priming bulb. Took the fuel pump apart, visually inspected the check valves and diaphram...sat, then put it back together, pluged one top hole with my finger and blew air into the other one no air passed through the diaphram, so I put it all back together. Priming bulb still is not staying firm even without starting. My father says one of the floats or more inside the bowl of the carb is probablly not rising. He suggested to go ahead and rebuild all 3 carbs so that is what I want to do now. The engine has been sitting for around 2 years. I cleaned the carbs better than I have ever done before but he said jets, orfices and needles could be stuck, clogged, or damaged. Any suggestions on where to buy cheap rebuild kit for my 1973 mercury 1150 6 cyl 2 stroke ser. number 3764029. I can't seem to find one for this engine. I also need a water pump rebuild kit, dropped lower unit just to inspect and oil was emulsified and the water pump fins were all towrn. any help would be really appreciatted!!!!!


Tim

 

[stbiblecg]

Re: 73 Merc 1150 2 stroke 6cyl Distributor

just ordered the everything for the water pump new seals, impeller, gaskets, etc. $90...ouch! Anyone know were to get a cheap carb rebuild kit for all 3 carbs

 

[asm_]

Re: 73 Merc 1150 2 stroke 6cyl Distributor

but the bulb does not go empty after a few minutes of running it goes empty if you bump the engine over for 1/2 a second,

If the primer bulb goes soft simply a few second without cranking the motor, I would agree with your father that perhaps the needle inside one of your float bowls isn't closing properly. That would lead to lost of pressure you are seeing.

B