Lower unit leak

[gonzz]

Re: Lower unit leak

Thanks...I know it wasn't torqued correctly. I am going to look for a puller for the carrier. Anyone have a source on one that has a fair price? I was thinking autozone tool loan program..

 

[merc850]

Re: Lower unit leak

This is the bearing carrier torque tool,.
maybe you can have a dealer rent you one or tighten it for you.That cost me $75 and I figure it's worth it. Spray a lot of penetrating oil around the top and bottom of the bearing carrier and let it soak for awhile before pulling. Sometimes it will need heat too!

 

[gonzz]

Re: Lower unit leak

Pulled it out this afternoon. It wasn't that hard. Now going to go see if I can find a puller. I need a 8" reach puller. We'll see.

 

[saumon]

Re: Lower unit leak

the slide hammer type work good for this

 

[merc850]

Be careful around the edge of the housing (see my LU picture) it is relatively delicate.

 

[Mi duckdown]

Re: Lower unit leak

gonzz. Is your drive shaft carbon steel or stainless steel?

 

[gonzz]

Re: Lower unit leak

Well got a puller today at harbor freight. Went to install it and only got one finger behind carrier and it moved. I then just hooked the puller and pulled the carrier out by hand. Crazy.. The O-ring on the rear or it was worn out and leaking for sure. I pulled out the prop shaft but noticed something wierd. In the diagram i see a spring and other pieces but i only had a cone shaped pluger inside the end of the prop shaft and that's it. Am I missing something? Pics will be posted in the morning.

 

[gonzz]

Re: Lower unit leak

gonzz. Is your drive shaft carbon steel or stainless steel?

Looks like Carbo Steel to me

 

[Moody Blue]

Re: Lower unit leak

That's all you're going to find without further dis-assembly of the propshaft. The spring, guideblock and three ball bearings are held inside the propshaft by the cross slide pin installed thru the clutch dog. That cross slide pin is retained in the clutch dog by a spring wound around the outside of the clutchdog.

Sure sounds like that lower unit has been opened up recently.

 

[gonzz]

Re: Lower unit leak

Thanks for the info. The lower unit was opened up right after I purchased the boat in Dec 2009. I had a few parts replaced. I changed the lower unit oil around October 2010 and noticed waer in it. That's when I knew something was wrong. I had someone change the prop seals and still was leaking. I decided to do the work myself now since I was paying and nothing was getting fixed. Thanks to all for the help. Seal kit will be in Hopefully in the morning or on Monday.

 

[Mi duckdown]

Re: Lower unit leak

gonzz the reason I ask if the shaft is carbon or stainless Is. carbon shaft tend to wear a ring/groove,rust at the impellar seal. make sure that is ok, since you have it all tore apart.

 

[gonzz]

Re: Lower unit leak

Oh ok.. It's the first time for me opening up a lower unit. Doesn't seem that bad.

 

[gonzz]

Re: Lower unit leak

Got a question. After I removed the Carrier I pulled out the prop shaft to inspect it. I removed the cone shaped rod from the prop shaft. The cone side was inward. Does the cone side fit into anything? I looked and can't see a recessed hole the cone would go into. Thanks

 

[merc850]

Re: Lower unit leak

Here's an exploded view for reference.

 

[gonzz]

Re: Lower unit leak

So I guess I'm talking about the Cam Follower (3). It appears the cam (2) has a hole in it so the Follower cone side fits in it. Is this correct?

 

[merc850]

Re: Lower unit leak

The cam is inside the housing turned by the shift shaft, the cam follower goes into the propshaft pointed side out.

 

[gonzz]

Re: Lower unit leak

Somehow the cam isn't aligned correctly. Once I get the seal kit and remove the lower unit in the morning do I turn the shift shaft to align it? Thanks

 

[merc850]

Re: Lower unit leak

This drawing shows the cam position, once propshaft is installed turn the cam counter-clockwise until it stops-this is forward, turning it more will be neutral and a little more is reverse.Never shift into reverse without turning propshaft at the same time. I replaced my cam $35 and the shift shaft seal $25 both can wear and the cam takes a lot of pressure in use.

 

[carholme]

Re: Lower unit leak

gonzz;

Here is a picture of the cam to backup what 850 said and you will see the arrow pointing to the start of the trough where the cam follower rides in to shift gears. The splined portion is where the shift shaft fits into the cam

http://img403.imageshack.us/img403/3793/glm11185.jpg

Gerry

 

[Moody Blue]

Re: Lower unit leak

Gonzz, whoever had that lower unit apart had no clue what they were doing. Better check every detail and part. Not to alarm you but there are (were?) shims used in the gear train to adjust backlash and proper meshing of the gears. Without them, the gearbox will be toast. We are talking about shims 0.001 - 0.015 in thickness. You are really going to need a manual to get it back together and setup right.

Here is a photo of the shift cam I replaced in my unit. Note the polished groove where the coned cam follower rides. The splined shift shaft fits into the splined hole of the cam. Looking into the lower unit with the carrier and propshaft removed, you will (should) see the shift cam at the very front, captured between two cast bosses. The cam is "pinned" there by the shift shaft and is free the rotate 360*.

IF the cam is installed properly, facing towards the rear the non-lobed side of the cam will be to the left (looking into the cavity).

http://forums.iboats.com/attachment.php?attachmentid=55399&d=1275698259