Cleaning Up Spare Engine

[oliver2-44 10,734]

I picked up this K301 12hp engine up for parts, but was surprised to find it had a 0.20 piston in it. It has some wear, but is still just in spec.  I'm going to hone and re-ring it to use a spare. My C-160 needs a full overhaul, so it will probable go on there for a little while.  This engine has been around the block, it has red paint at the bottom, then Ford blue, then Cub yellow. 

 

 

I'll start with some PTO questions?  This is the PTO from my 1979 C-161 that way down the restoration list.  Sadly it might just become a parts machine. 

 

I have a new clutch to use on this, since the old one is down to the rivets. Note the difference in the "width" of the old and new clutch material.

Has anyone found a source for replacement clutch lining and if so, can it just be epoxied on?

 As you can see the rivets wore the PTO face, that groove is about 0.013 deep, best as I can measure.  I'm thinking of having this machined. I know I should tell them to remove the least metal possible to maintain the thickness. What would you tell the machinist?  I'm thinking of telling him to go about 0.014 ths or 80% clean up.

 

I had to use a puller to get this off the K341 shaft, which I expected. 

But once I cleaned it up the ID of the bearing race measures 1.128. Which means it's 0.003 ths larger than the shaft, A nice (not wobbly)  sliding fit on a clean shaft. The above engines shaft measures 1.4995 

Is this normal, or did it get stretched pulling it off?  

If it's reuseable, should I use some "Gap Filling" locktite to install it.

 

The OD of the PTO bearing race also shows some wear. The far end that should not see any wear measures 1.500 as expected.  all of the bearing area measures 1.498.   I cleaned it up with scotchbrite, no emery used.  I cleaned the bearing and it seems OK. When I put the race in the bearing (with just a little oil on bearing) it slides in easily.  If you try to wiggle it, i can't detect any wobble.

Considering the above OD and ID measurements is this race reusable, or is it time to bite the bullet and get an (expensive) new one? If I buy a new race, I'll get a new bearing as well.

 

 

Edited May 11, 2019 by oliver2-44

[ebinmaine 72,727]

3 hours ago, oliver2-44 said:

to remove the least metal possible to maintain the thickness. What would you tell the machinist?  I'm thinking of telling him to go about 0.014 ths or 80% clean up.

I can't answer the rest of the questions but I'll put in on this one. I think your idea is solid there.

Many many moons ago when I used to turn brake drums and rotors they would vary tremendously. Best you can do is just have them clean it up to the minimum that you know which is what you stated.

Even if that thing is a little warped in relation to the hub you should be able to get a flat surface, not counting the groove, by 0010 to 0015 in.

[Dakota8338 115]

4 hours ago, oliver2-44 said:

The OD of the PTO bearing race also shows some wear. The far end that should not see any wear measures 1.500 as expected.  all of the bearing area measures 1.498.   I cleaned it up with scotchbrite, no emery used. 

 

In case anyone is not aware, 'stainless steel scrub buds' will not scratch the finish and used in combination with diesel or true cleaning solvent in a parts washer, real encrusted, greasy, cruddy & grubby parts will wash up clean as new.  I always keep a pack handy for use and they will take surface rust off without harming the finish.  Deep rust has already harmed the finish!

 

 

[oliver2-44 10,734]

@Ed Kennell @richmondred01 can ya'll share any experience with PTO ID journal ID and OD question above.

Thanks for any help. 

[Ed Kennell 42,047]

My experience is the  PTO needle bearing assembly clearances are not very critical.    And this is understandable if you think about the operation.    When PTO is engaged, the bell is locked to the crankshaft via the clutch resulting on zero rotation and no load on the needle bearing.    When the PTO is disengaged,  there is rotation, but only the radial load created by the belt tension.

The axial thrust bearing does see high loading with the PTO engaged.  

[richmondred01 2,307]

I agree with Ed.

I can’t add any additional insight, he covered it well.

All the best

[oliver2-44 10,734]

Thanks for the guidance.

[The Tuul Crib 7,339]

Awhile back l found a six inch fiber disc on fleabay. I also found the rivets from another source. The fiber disc was a little 

pricey though. Around 30 bucks