stupid question - squarenose coupler

[SharkB8]

I built a 61x motor using some parts from a 6m6.

When I removed the engine-side coupler from my 6m6 to put on the 61x, it didn't have a "cap" on it like the midshaft-side coupler did. I think the previous owner must have lost it or something, because the yamaha parts catalog shows that its supposed to be there (see 6m6.jpg).

But the 61x's don't have a cap on their couplers (see 61x.jpg).

So given that I'm using a 61x crank and a 6m6 coupler, should I order a "cap"?

Or is it even important enough to worry about. Could I just make sure the center of the coupler stays covered with marine grease whenever I pull the motor? I assume the grease is there just to prevent corrosion on the threads.

 

[Waternut]

My 61x has caps on the engine coupler and midshaft. I wouldn't really consider them to be a water tight seal but maybe they help keep some water out. If I was missing one, I wouldn't order one for sure.

 

[SharkB8]

I was hoping someone would say that - thanks.

 

[Kennay]

I wouldn't order one, but I would definitely put a healthy amount of anti seize on the threads. Then maybe goop some grease in the hole once it's on :naughty:

 

[kevbo]

The cap on the engine side helps reduce corrosion by keeping water off the threads. The mid-shaft cap is much more important, it the only thing keeping grease in the shaft and water/debris out. The cap has an O-ring in it and works very well.

 

[SharkB8]

Thanks for the info - I will just keep marine grease on the engine-side coupler every time I pull the engine.

 

[tor*p*do]

you can always post a "want to buy" thread
and hope someone has some laying around he will let go for cheap

 

[restosud]

if you cake the grease in there it'll fly right out when the engine runs.
better have a cap then.

 

[SharkB8]

Yeah - I will probably be leaning over the motor the first time it starts so I would probably get an eye-full. I will make sure its a light coat of grease.

I'll go post a want-to-buy thread right now.

Thanks..

 

[oxnard111]

the cap on my midshaft side coupler came loose one time and put a ton of grease into my hull. i took off my hood and first thought i had an exhuast leak, but was just the stupid midshaft.