How Much Grease for Mid-Shaft Fitting 94 Superjet?

[Ragecage]

Just picked up a 94 Superjet to relive my 20's and I have a question:

There is a grease fitting to pump grease into the mid-shaft housing (took me forever to see it although it was so obvious). I have seen previous threads warning if you pump too hard or too much you can pop the seals. I get it. Question is how do I know how much is enough? Should the grease start popping out inside the hull section like a trailer wheel bearing? I have a mini grease gun and have squeezed about 1/2 of the mini tube so far and I haven't seen a thing. Don't want to over do it. Any suggestions would be appreciated. Thx

 

[Baja 252]

I just give mine a couple of pumps, once a year. A half a tube, I fear you already over did it.

 

[Ragecage]

Probably but it can't be that much worse since I discovered there was a leak coming from that spot after I bought it. It's a slow drip and explains (duh!) the aftermarket bilge pump that is placed right under the drip. All good I guess. It I hate that the compartment is constantly exposed to salt water (which is all I ride in). I hose down engine then vacume remaining water after each ride. It is what it is since that job to replace those bearings and gasket looks pretty big. Thx

 

[vomitspot]

the grease is for the seals not the bearing
if you have greases it a bunch you may have blown the seal

 

[mbrick]

I suggest you read the owner's manual, and pick up a factory Yamaha service manual.

Re: greasing, here's what the owners manual says:
Intermediate housing
Fill the intermediate housing with water-resis- tant grease through the grease nipple using a grease gun.

Grease quantity:
Initial 10 hours or 1 month:
20.0–22.0 cm3 (0.68–0.74 US oz,0.71–0.78 Imp.oz)
Every 100 hours or 12 months:
3.0–5.0 cm3 (0.10–0.17 US oz, 0.11–0.18 Imp.oz)

If you put in half a 3oz tube, you definitely put in more than the recommended amount for either interval.

 

[DAG]

If your midshaft is leaking aka not sealed you likely have a pump cavitation issue

 

[Ragecage]

Ski does run fine. It's just a slow steady drip coming from that whole housing area. About a drip every 3 seconds. I'm not happy about it but the bilge takes care of it and as long as I turn it around on the beach when not riding all is good for a 23 year old ski IMO. Thx for the feedback all.

 

[vomitspot]

Prob the rubber has let go from the alum housing

 

[mbrick]

Yea, I'd definitely be checking it out. If the rubber let go your mid shaft bearing could be or will be flopping around soon. Although I imagine you would hear that...