| Author |
Message |
    
Val Orcutt
New member
Username: valor21
Post Number: 1
Registered: 06-2009
| | Posted on Monday, June 29, 2009 - 07:45 pm: | 
|
I`m putting a new gearset in my 48hp evinrude and not sure about shimming the input shaft, would like to know how and why you shim this shaft? |
Graham Lamb
Senior Member
Username: galamb
Post Number: 5498
Registered: 05-2007
| | Posted on Monday, June 29, 2009 - 09:03 pm: |
|
Shims are necessary to get the alignment precise enough to allow the gears to mesh together without damaging each other.
Most of us who work out of our garages do not attempt to figure which shims are required etc - I have always found it easiest to let a shop with a jig to that - ya it cost you a bit of labour, but much better than toasting a new set of gears because you didn't get them set up properly. |
Morten Ringvold
Senior Member
Username: haffiman37
Post Number: 3854
Registered: 04-2006
| | Posted on Monday, June 29, 2009 - 10:14 pm: |
|
All the shop need is the complete driveshaft with pinion, bearing/bearing housing and shims. You do not have to bring the whole gearcase. The measurement/shimming is a 5 min job. |
Graham Lamb
Senior Member
Username: galamb
Post Number: 5504
Registered: 05-2007
| | Posted on Monday, June 29, 2009 - 10:22 pm: |
|
Yes, I forgot to mention that - thanks Morten. |
Val Orcutt
New member
Username: valor21
Post Number: 2
Registered: 06-2009
| | Posted on Monday, June 29, 2009 - 11:31 pm: |
|
I didn`t know if shimming was to fit the gearset or to preload the bearing, I guess it would not be a good idea to just put the shims back in that came out |
Morten Ringvold
Senior Member
Username: haffiman37
Post Number: 3855
Registered: 04-2006
| | Posted on Monday, June 29, 2009 - 11:52 pm: |
|
It's for shimming the gears. Upper drive shaft bearing is not pre-loaded.
You may normally change bearings without the need of re-shimming, but changing gear-sets is a different thing. |
jwbmarine
Senior Member
Username: jwbmarine
Post Number: 4549
Registered: 11-2005
| | Posted on Tuesday, June 30, 2009 - 07:44 pm: |
|
I would'nt call it a '5 min' job,at all,..each,and everytime,that assm has to be torqued to spec;s...first time to short,next time,to long.....--.020 is the norm,shim clearance,sometimes it takes many shims,of diff thickness,to achieve this....... professionally! |
william g moore jr
Advanced Member
Username: william_m
Post Number: 231
Registered: 05-2009
| | Posted on Tuesday, June 30, 2009 - 09:11 pm: |
|
Do it wrong and get one trip and you need a set of gears all over again. |
