Ignition Coil Swap on a 1976 70 HP Question...........

[mrcj001]

I`ll Make this short as possible:

1976 70 HP Rude

#1 Coil has a crack in it.....the other two look fine.

Ordered New coil and the CDI coil that was sent is completly different than the old ones.

A few seasons ago, I blew up my 1975 135 HP Johnson. I installed brand new coils on it before it blew. I kept them and other parts and scrapped the the rest.

The coils off of the 1975 135HP look identical to the coils on the 1976 70HP rude

Question is........

Can I just swap the coils off from the 135 HP? Or , do the coils on the 135HP have two much voltage or is it the same??

BTW:
The only thing visually different is the length of the spark plug wire and the coil lead wire.......they are longer. The bolt patteren is the same...they will bolt right up.

 

[mrcj001]

Re: Ignition Coil Swap on a 1976 70 HP Question...........

Bump...........

 

[jay_merrill]

Re: Ignition Coil Swap on a 1976 70 HP Question...........

The CDI brand coils do look different than the original OMC coils, but they work just fine. I would go ahead and use the new one.

 

[durban]

Re: Ignition Coil Swap on a 1976 70 HP Question...........

they are better to because the coil doesn't keep the heat in , its more ventilated

 

[mrcj001]

Re: Ignition Coil Swap on a 1976 70 HP Question...........

Well, I spoke with a marine Tech today and showed him the three different coils. He said if you use the new CDI coils I should replace all of them at the same time,which I really didnt want to spend another $100+ dollars.

He said that the coils from the 135 engine would put out about the same voltage and as long as they bolt up properly he didnt see a problem with using them. He said the difference in part numbers would be because of the length of the leads.

After looking at number of different part numbers for coils of engines of that era, CDI has footnotes that they use a universal coil anyway.