Chrysler 6 HP - How to get at bottom spark plug

[MarkinKC]

I bought a sailboat from a mechanic a few days ago, and the boat came with a 1974 Montgomery Ward (Chrysler built) 6 HP outboard. The starter gear is broken, and there's a new one on the way, so I should be fine there.

The guy I bought it from mentioned that he thought it wasn't getting spark to one cylinder, because it had a tendency to backfire at times. When I went to check the bottom plug, I realized that I had no idea how to pull it out. There's not enough clearance between the cylinder head and the casing to get the plug out even if I could get a wrench in there, which I can't. Is it necessary to pull the entire top half of the outboard out to change a plug? That seems mildly insane. Hopefully someone here can enlighten me.

*Note - I have been working on everything mechanical my whole life, but this is my first outboard motor. While I understand how a two cycle works, I likely need a vocabulary lesson, so please bear with me.

Thanks.

 

[Nordin]

I do not know how the Montgomery Ward is designed but it sounds odd that you can not remove the lower plug.
I have worked on many 4,5Hp which is similar to 6Hp and also many 6Hp Chrysler and I use a ring wrench or a wrench.
No problem to remove the plug, but as I said have never worked on a Montgomery.-

 

[MarkinKC]

I do not know how the Montgomery Ward is designed but it sounds odd that you can not remove the lower plug.
I have worked on many 4,5Hp which is similar to 6Hp and also many 6Hp Chrysler and I use a ring wrench or a wrench.
No problem to remove the plug, but as I said have never worked on a Montgomery.-

The 1974 Montgomery Ward Sea King 6 HP outboards were built by Chrysler, so it's the same motor.





Hopefully this will help to illustrate my problem.

 

[pnwboat]

Looks like you need a thin wall box end wrench. Just take a cheap box end wrench and grind the outer circumference of the box end until it's thin enough to fit on the spark plug.

 

[Bullie]

This is what I use to get the lower plug out of the old Chryslers. It will rotate from the front to the rear right over the plug. It's the best thing I have found. They are a little frustrating until you find the right tool.
http://www.harborfreight.com/8-in-1-...nch-65498.html

Note: I haven't tried it on a 6 hp but it looks just like the 8, 9.9, 10 I have worked on...

 

[Frank Acampora]

Those are miserable witches with a B. First you need to get the plug wire off which is no fun. Then remove the top plug. Using a box end or open end wrench loosen the bottom plug. There is JUST enough room to unscrew it. Then, you have the pleasure of putting it back! LOL