1994 225 hp

[Bobbyr]

I have what looks like a lower crankshaft seal leaking . Does anyone know if you have to split the block to replace the seal?. My manual is not very clear if you have to, I thank you do ,but it would make life a whole lot easier if you don't.Thanks in advance..

[jb123]

maybe a dumb question...but how do you SEE a lower crank leak.... i would assume to even gettin close to seein anything in that area the block would have to be off the motor to see the bottom... unless maybe you have leakage runnin down your shaft to lower unit.... for the upper as i remember you can replace without splitting...not sure about the bottom.

[Bobbyr]

jb If you remove the coweling under powerhead on the side of motor you can see where the driveshaft goes into the powerhead at the lower crankshaft seal.Mine has oil on it and it drips down my mid section.So if anyone knows if you have to crack block to remove lower crankshaft seal.?? thanks

[jb123]

might be just the base gasket and youre seeing spent fuel, no? are you losing crankcase pressure?

[Bobbyr]

I guess its could be how do you know if your losing crankcase pressure? ... More background info I just rebulit motor (with some help) Friend that helped is out of town fishing SKA, anyway ,I have all new pistons ,rings, I had to replace crankshaft (with good used one)I had lower crankshaft bearing go bad and replaced also when lower bearing went bad it chewed up my lower crankseal housing,so we replaced it with used one from where I got crankshaft.It was good and seals were good (I thought) I can't remeber if you have to split block to remove lower crankseal ?? I guess I could wait on my buddy to return, but I'm just to impatiance. Thanks

[jb123]

if you were losin crankcase pressure, your motor would run like crap, if at all. is what you see clean oil or spent mixture/sooty like what you see out of the lower unit and exhaust ports..

[Bobbyr]

jb what Im seeing looks like clean green oil,also motor is running great. I got about 20 ho
urs since rebuilt. But this leak is a problem.

thanks

[jb123]

if youre motor is runnin great, then your fuel mix is good or it would have burned up, no crankcase leak, as that would probably burn your motor also,i would suggest gunking your motor round the base gasket area and watch your oil pump for a leak.

[Bobbyr]

jb I already gunked it , I have no oil pump. I premix my gas and oil. It seems to be leaking rite where the drive shaft goes into the lower crankcase seal housing.My question is if you have to split block to replace this seal.? Thanks again

[Ken]

Bobby,
When you re-install the lower unit it is common to put marine grease on the splines of the drive shaft. Could the "green oil" you are seeing on the drive shaft just below the crank actually be grease that has liquefied? Just a thought....
Good luck,
Ken K

[Mr. Aroha]

I realize this is an old thread, but unfortunately I have the same question that never got answered. Does the head need to be split to replace this bearing?????

Mahalos