10 pole or 12 pole conflict?

[stsmith]

I just got a 1978 55hp Johnson model # 55EL78S<br />I bought a Teleflex tach thats says my motor is<br />a 12 pole/pulse; however, teleflex website says 10 <br />pole/pulse. This tach is not adjustable, part number<br />58477P Waterproof. The Seloc manual does not state<br />(that I can find) the specs on this. Can anyone please help me out?<br /><br />Smitty

 

[Joe Reeves]

Re: 10 pole or 12 pole conflict?

The tachometers operates off of the charging system which on a OMC engine emit six (6) pulses, not twelve (12).<br /><br />You need a tachometer that can be set to operate at the six (6) pulse rate.

 

[rodbolt]

Re: 10 pole or 12 pole conflict?

joe<br /> i thought some of the 2cyl motors with 4 wire rectifiers ran off a j/e setting or 5 pulse. I know there were some issues in the late 70's and 80's. been to long but I remember some did.<br /> post me back if you have any memories on this.

 

[stsmith]

Re: 10 pole or 12 pole conflict?

I am new to this type of charging/tach system, but by going by this information and the information at the teleflex site "http://www.tflx.com/obtachtrad.html" <br />I gather that it takes 2 poles to make 1 pulse ??<br />Is there a simple way to count the poles? Or where could I find the specs from OMC?<br /><br />Stumped <br />Smitty

 

[stsmith]

Re: 10 pole or 12 pole conflict?

Here is where the problem lies lol<br /> Teleflex website page <br />OR<br /> An image of the application chart that came with the tach. <br /><br />Please tell me what I am missing?<br /><br />Thanks <br />Smitty

 

[CorB]

Re: 10 pole or 12 pole conflict?

Same problem here on same engine (55EL78S). My Faria tach documentation says to choose 10 poles (= 5 pulses), but I have doubts now because Joe Reeves says 12 poles (6 pulses). The only thing that I can find in my service manual is the following: "The stator assembly is made up of 8 coils". I'm breaking-in this engine right now and I like to be sure my tach is reading the right revs. Anybody an Idea?

 

[stsmith]

Re: 10 pole or 12 pole conflict?

Best I can tell these models came with both 6p and 5p. I don't think anybody knows how to tell the difference. The application chart on my post earlier only shows one for a 1978. Turns out we have the engine right down to the model number. I am going to try the 6p like the app. says. <br />Good Luck to both of us<br />Smitty

 

[CorB]

Re: 10 pole or 12 pole conflict?

Smitty,<br /><br />Both settings will work, you just get slightly different readings. I know rigging a separate tacho which measures at the revolutions of the flywheel or something should give enough info for comparison and decide which setting is right. I just hoped someone knows the answer rightaway.<br /><br />Good luck to you too.

 

[steviecops]

Re: 10 pole or 12 pole conflict?

I've got a 1980 Johnson 55 and a Faria tach. Mines set for 12 poles and it works fine. Having said that, I haven't tried ot on a 10 pole setting!<br /><br />I was also confused by the teleflex web site telling me that all 2 cylinder OMC's under 70 hp were 10 poles.<br /><br />I'd go with what Joe says, he knows.<br /><br />Good luck<br />Steve

 

[rickdb1boat]

Re: 10 pole or 12 pole conflict?

I agree with steviecops. Go with what Joe said. He's only been doin' it for 30 years...

 

[Dhadley]

Re: 10 pole or 12 pole conflict?

Heres the way OMC used to explain it;<br /><br />2 cylinder 40 to 50 hp regulated is 12 pole / 6 pulse, setting on 6.<br /><br />2 cylinder 40 to 55 hp with rectifier only is 10 pole / 5 pulse, setting on 5.

 

[Mark42]

Re: 10 pole or 12 pole conflict?

Been having the same problem with my 40hp. OMC manual says its 12 pole, but people seem to say otherwise without any explanation. <br /><br />So I am stumped too.

 

[stsmith]

Re: 10 pole or 12 pole conflict?

Dhadley:<br />How do we know if we have a regulated or a rectifier only system? I have a 55EL78S. These 2 sites show the problem many of us seem to have. <br /> http://www.tflx.com/obtachtrad.html Which states everything under 70hp is set at 5p<br /> http://www.south-tampa-online.com/boats/58477P.gif <br />States mine is a 6p. <br />I guess the biggest question is how can we tell by looking at the motor what system it has on it? It seems to me that they used more than one charging system on the same model motor.<br /><br />still stumped<br />Smitty

 

[CorB]

Re: 10 pole or 12 pole conflict?

The OEM manual of my 55EL78S says I only have a rectifier, no regulator.<br />So for me the setting of 10 pole/5 pulses is the right one.<br /><br />Smitty:<br />As far as I know a regulator should be an individual electrical item, it's not incorporated in the stator assembly. <br />If you located the stator assembly (under flywheel), choke solenoid, power pack, rectifier, 2 ignition coils, starter solenoid, starter motor and the fuse and still have an electrical item left, that might be a separate regulator. If everything I've listed is on your engine and there is nothing left I guess you have an unregulated system.<br /><br />Dhadley:<br />Thanks a lot for your valuable advice, this isn't the first time you helped me in the right direction, I appreciate that a lot.<br /><br />The rest of the guys:<br />Good luck

 

[Dhadley]

Re: 10 pole or 12 pole conflict?

Smitty, I read it the same as CorB. Your motor was produced without a regulator so the setting would be 5.<br /><br />Now, keep in mind that this is what OMC said about their motors and their tachs. T-flex tachs may be different, I dont know. <br /><br />Like Rodbolt, I remember something about 3 wire and 4 wire rectifiers. But the 3 wire rectifiers without a regulator call for a setting of 5 -- according to OMC.

 

[Mark42]

Re: 10 pole or 12 pole conflict?

While we are on this topic, I still need help with my '93 40hp. The OMC manual says 12amp, 6p setting for 40hp & 50 hp recreational, all other are 4 amp 5p settings. But the rpm on the tach when it hits the power pack limmit is about 5700, and the manual says the limmit is 6700. So I am wondering what is set wrong, the tach, the powerpack or the OMC manual?<br /><br />Please help.<br /><br />Thanks,<br />Mark.

 

[CorB]

Re: 10 pole or 12 pole conflict?

Originally posted by Dhadley:<br /> Smitty, I read it the same as CorB. Your motor was produced without a regulator so the setting would be 5.<br /><br />Now, keep in mind that this is what OMC said about their motors and their tachs. T-flex tachs may be different, I dont know. <br /><br />

That's correct Dhadley, after following this discussion and checking my own tach again, I got the idea that is important to see the number of poles, the number of pulses (# of poles/2), and the setting of your tach as different variables. In my personal situation (10 poles and a Faria tach) the setting should be 4. That's what corresponds with 10 poles and not 5 like mentioned by me & others before. So yes indeed the setting number on the tach will differ depending on the manufacturer.

 

[onehunglow]

Re: 10 pole or 12 pole conflict?

Can anyone tell me where in either the Evinrude (Johnson), Seloc or Clymer manual that it lists the number of alt poles, pulses or anything of that subject?

 

[stsmith]

Re: 10 pole or 12 pole conflict?

I know that the Seloc 1971-89 1 1/4 - 60hp does not. Very little information in this book. I do not recommend this book. Do not know about the Clymer. <br />Pulling the flywheel did not help me determine what mine is.<br />Best I can tell (check my math)the difference should be about 10% +/-. So if it reads 5,000 rpm you could be at 4,500 or 5,500 pending what setup you have.<br /><br />Smitty

 

[stsmith]

Re: 10 pole or 12 pole conflict?

For me it is hard to trust T-Flex the manufacture because both applications I posted came from the<br />same manufacture. ??<br /><br />Smitty