1970 Mercury 7.5hp

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BlueHaze
Posts: 29
Joined: Sat Mar 14, 2015 6:31 am

1970 Mercury 7.5hp

Postby BlueHaze » Wed Sep 06, 2017 8:33 pm

I have a 1970 Mercury 7.5hp, #2954927.
It has the "Phase-Maker" ignition. I have read it can be swapped out for an older Phelon ignition. I don't want to spend $275 for a new stator.
Can it be retrofitted? If so, for a parts motor, what year and hp models do I look for?

This is the first Mercury I've worked on, so these ignitions are new to me. Is the 1970 Merc 7.5 worth messing with???

Callie30R
Posts: 52
Joined: Fri Aug 14, 2015 9:19 am

Re: 1970 Mercury 7.5hp

Postby Callie30R » Wed Sep 06, 2017 9:21 pm

That engine has a green potted stator and a ground breaker stop switch , if the wires are all good and the stop switch has good ground but the engine has no spark most likely the maker point white insulators are probably shorted and need to be replaced they are still available and inexpensive if the coils are brown they should have been replaced with green ones .

BlueHaze
Posts: 29
Joined: Sat Mar 14, 2015 6:31 am

Re: 1970 Mercury 7.5hp

Postby BlueHaze » Thu Sep 07, 2017 5:32 am

Yes, this has the green stator, but it has a large chunk of the top blown off it. Also, the wires coming out are disintegrated, cracked and completely corroded inside.
It had intermittent spark to the lower cyl, and when I switched coils, the upper had some intermittent spark.

I'd like to get rid of the PaseMaker, and switch to a traditional Points, Coil, Condenser set up if possible.

westwind
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Location: Ontario, Canada
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Re: 1970 Mercury 7.5hp

Postby westwind » Thu Sep 07, 2017 9:00 am

A previous generation 9.8 or 6 hp donor motor should work. Not sure how far back you can go. There should be some powerheads around since the lower units were a bit weak. It's probably a good idea to take your lower unit apart to make sure it's in good condition before going through the trouble of swapping the ignition.
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BlueHaze
Posts: 29
Joined: Sat Mar 14, 2015 6:31 am

Re: 1970 Mercury 7.5hp

Postby BlueHaze » Sat Sep 09, 2017 11:09 am

Ok, I'll look for a pre 1970 6 to 9.8hp donor.
The gearcase looks good, and the compression is an even 130 lbs per cylinder. It's a fresh water motor in nice condition except for the stator.
Does anyone know how early a year I should look for? Black motors only??

Thanks for the replies!


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