Upper Gear unit Bearing Replacement

[dustedwatts]

I have a 1974 Mercruiser 120, problem started w/ this post http://forums.iboats.com/showthread.php?t=404314
anyway,,,, upper gear unit bearings need replacement, person that was going to do it for me is slammed at work, won't get to it for at least a month, (end of boating season) I have access to the spanner wrench, shim tool, and press, however I need no know how to correctly shim the bearings, (GEARS are in great shape)
any help is greatly appreciated.

 

[ziggy]

Re: Upper Gear unit Bearing Replacement

i did the brgs. on my drive gear ujoint yoke shaft. my best advise is to get the mercruiser service manual and follow the instructions to the letter. that's pretty much what i did. what i didn't understand while i was in the middle of the project i came here to iboats to ask. the mercuriers s/m instructions were spot on imho. in other words. my repair worked and is now on it's third or so year w/o indecent of that repair.

 

[Bt Doctur]

Re: Upper Gear unit Bearing Replacement

page 3A-26 ,this link,
http://www.boatfix.com/merc/Servmanl/6/6A3R3.PDF

 

[zbnutcase]

Re: Upper Gear unit Bearing Replacement

Just take your time, have everything spotlessly clean, service manual on hand, and ask us if you have questions. No such thing as dumb questions here, but dumb mistakes can be spendy!

 

[dustedwatts]

Re: Upper Gear unit Bearing Replacement

how tight is the retainer? what special tools will i need, other than spanner wrench for the retainer. anyone know a good inexpensive place to buy them?

 

[ziggy]

Re: Upper Gear unit Bearing Replacement

how tight is the retainer?

200 ft. lbs, per the s/m.

what special tools will i need,

if yer gonna do ujoints, a ujoint press is cool, along with the special ujoint adaptor the the service manual recommends. assuming ya got the small spacer, a torque wrench that'll measure 85 ft. lbs. round abouts, can't remember the exact torque value. it's in the service manual. if ya don't have the small spacer. you'll need a inch pound torque wrench that'll measure rolling torque of 7 in. lbs, round abouts. the service manual will have the spec. my guess is you'll have the spacer.

anyone know a good inexpensive place to buy them?

iboats
http://www.iboats.com/Mercruiser-Sp...0521748--**********.226604178--view_id.269858

http://www.iboats.com/U-Joint-Adapter/dm/*******.730521748--**********.226604178--view_id.271201

i got a ujoint press at harbor freight...

 

[tejastoolman]

Re: Upper Gear unit Bearing Replacement

I ordered all my tools off ebay, spanner, alignment tool, shift cable socket, hinge pin.... got them all for less then 100 bucks.. and they are gonna last longer then 50 years that I plan to use them... or will be gifted to the new owner when I sell off the boat, how nice would that be!

the spanner wrench needed some filing down as it was dip-chromed lol but they all worked like a charm on my 1st DIY here

I mean unless your a shop do you really need a mercruiser stamped tool?

 

[dustedwatts]

Re: Upper Gear unit Bearing Replacement

the spanner wrench needed some filing down as it was dip-chromed lol but they all worked like a charm on my 1st DIY here

I mean unless your a shop do you really need a mercruiser stamped tool?

I purchased the same spanner tool, needed to file mine too! get what ya pay for i guess, but worked just fine! even if it was one time use still paid for itself!

 

[paultjohnson]

Re: Upper Gear unit Bearing Replacement

I bought a spanner wrench from on E Bay from a dealer in ohio for $21.99 plus $8 or so shipping. He had it to me in Mn in 48 hrs. Sorry I Boats couldnt touch that price....