Ruh-Roh… a new gear case may be in order

[racerone]

push the clutch dog to forward gear position.

 

[JimDirt]

Ok. I’ll give that a try this afternoon

 

[JimDirt]

So ya I reached in with a hook and finagled the pinion gear around and got it out. Woohoo! I don’t see any obvious signs of wear or damage to anything, except for the water pump housing. Are there any certain parts that I should just replace just because they’re 30+ years old? The silver thing with the blue is I’m guessing a bearing that the whole works rides on? It feels smooth and tight. The bearings on the drive shaft seem good too. The one in the case for the drive shaft I haven’t had a good look at it yet. Is there a seal that goes around the shift shaft that should be replaced?

 

[Mc Tool]

That pump housing has had a good melt down ,looks like its been run dry.

 

[JimDirt]

That pump housing has had a good melt down ,looks like its been run dry.

Ya I will be replacing that.

 

[Mc Tool]

Ya I will be replacing that.

Have a good look at the base too , it may be a bit the same . I wound up replacing the whole pump on my Honda.

 

[Chris1956]

A complete replacement of the waterpump is a normal maint. item. Your waterpump upper is pretty rough. Much rougher that any ones I have replaced.

 

[JimDirt]

A complete replacement of the waterpump is a normal maint. item. Your waterpump upper is pretty rough. Much rougher that any ones I have replaced.

What does the “ water pump upper “ refer to? The housing? I have a complete pump kit on order as well as a gear case seal kit

 

[Chris1956]

Jim, If your engine is like my Johnny 150HPV6, the Waterpump consists of (in order from bottom) a gasket, stainless wearplate, Impeller w/ oring, plastic pump upper w/ Oring, plastic water tube w/a seal. All should be replaced as a maintenance item. Don't forget the gasket sealer, silicone to hold the Orings in place and some grease on splines and seals.

Mercs, in contrast have both waterpump upper and waterpump bases, as well as a wearplate and two gaskets. That is why I referred to the OMC pump as a water pump upper. I had hoped for less confusion, vs more.