Gear head Case Assembly ENV 18hp

[fry-cook]

Hi,

I have an 1964 18hp Evinrude Fastwin and I am replacing the seals, impeller, etc in the lower unit It has a gear case head assembly, looks like a small can with a brass bushing. My question. Are there gears in it, or is it pretty mach a ‘passive’ unit? A new one is $167.00, is it supposed to turn /spin? or does the shaft just pass through it? How do you know if it’s good or bad?

Thanks, Tom

[lindy46]

No gears in the head – just a seal. The propshaft passes through it. It doesn’t turn or spin.

[frankr]

Do you have the replacement seal? It is part number 302545, replaced by 313284. About ten bucks.

[outbdnut2]

You can see an exploded view here:

http://www.marineengine.com/parts/johnson-evinrude-parts.php?year=1964&hp=18&model=FD-18&manufacturer=Johnson&section=Gearcase+Group

[fisherman6]

There are no gears in this piece and it does not spin as mentioned before. What it does contain besides a pocket for the prop shaft seal is the bronze prop shaft bearing. It is an important piece and I would not classify it as "passive" myself. If the bearing is worn out or scored, it will accelerate wear of the rest of the gearcase components. That said, I know most of us don’t put tons of hours on these things every year and one in marginal condition will still allow you to enjoy a motor that would not otherwise be run and enjoyed at all.
-Ben

OldJohnnyRude on YouTube

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