I've been told its a good idea to pump water resistant grease into the threaded port at the too of the jet is that a good idea. Thanks Maloney

I have a berkley 12jg when do you know  when to fill it since there's no way to check it? How full does it need to be?

I check mine before going out. Take both plugs out, fill at highest hole til fluid runs out of other hole and put plugs back in. My pump is a Berk JC and I assume jg us the same

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Yeah what he said. I use 90wt gear oil and full every time I take it out. Most of the time it seeps out the bottom too.


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If its seeping out..time for a new bowl/shaft gasket. I started using grease in mine and did it that way for years without any trouble.

Yes I used the 90w when I first got the boat and it seaped out/mixed with water. Then nest time I used 2 bottles of 140w and pushed out water and oil mix till it was coming out clear and seeping stopped and no more water mix.  When I check it is usually full and clean with no water mix 

Berk manual says gear oil, but caint remember what weight for sure. The grease thing sounds fine but....I am just unsure til I try it myself. This is another one of those topics that you can here a ton of different things like the water flow thru engine and headers thing..

Check out Lucas oil M8. It's a marine gear oil.

Defiantly use gear oil.   If you look around on the companies website,  it will tell you what weight to use but I am pretty sure it's 90w

Grease is totally fine.... did it for years without any damage to bowl or shaft.

Technically speaking, grease is for rolling element bearings. The bearings in the bowl are babbit.

When grease is used it should be done every single outing, after the shaft moves even a little there is no grease contacting the moving parts.

Also the bowl bearings do not get warm enough to drop the oil out of the grease which is how most greases work.

You more than likely did not have any issues because of the amount of hours the pump ran and unless you actually measured the bearings, have no idea how much wear took place, the grease will definitely slow the wear on the shaft though. I highly recommend gear lube with a race shaft, $3 worth of oil is better than $400 for a new shaft.

JMHO.

GT

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Whats the best gear oil to use?

Does the 12 JR berkley jet use the same gear oil.