301 rebuild questions

[moe1965 738]

Just about finished with my rebuild.  Just wondering what is recommended for a break in run time if any at all.  Thanks it's been a fun project so far I rebuilt a engine with my dad back around 1982 I was  around the age of 14 ish.  He passed away last year at the age of 94.  I found all his tools like ring compressors and books etc that we used. Brings back lots of memories for me I guess this is why Im doing this project

[peter lena 8,625]

@moe1965  using rotella # 30  wt as your oil ? very good on those engines , personally would run it regularly , till it starts to discolor , then a hot flush oil change , to enhance drainage . been using , rislone  zinc additive to my oils couple of years now , instructions on back of bottle , my engines run with a definite  ease of function , just an idea. pete

 

[SPINJIM 1,981]

I've read somewhere that you should run the first few hours with multi-weight dinosaur oil (maybe with a little Marvel Mystery Oil), then drain it and refill with a good multi-weight oil like Rotella, Mobil 1, or Castrol synthetic blend with the afore mentioned Zinc additive.   I also shoot a little oil into the cylinder on first start up, and use 'assembly oil' during the rebuild.   I think the main goal should be a few oil changes during the first year of break-in (depending on how much it's used).    

 

[Jeff-C175 7,202]

3 hours ago, moe1965 said:

my rebuild

 

Did you remove the balance gears Moe?  If so, when you get it running again I'd be interested in your observations of whether or not  you feel more vibration.

 

1 hour ago, SPINJIM said:

first few hours with multi-weight dinosaur oil

 

Agree with that... you want SOME wear to occur in the first few hours so that the rings seat properly.

 

After that, Rotella T1 straight 30 with 1 oz / qt of ZDDP.

 

1 hour ago, SPINJIM said:

use 'assembly oil' during the rebuild

 

[moe1965 738]

Yes I did remove balance gears and will give feed back as soon as I get her up and running. Probably by Monday.  It's a 12 hp I'm rebuilding 

[Jeff-C175 7,202]

34 minutes ago, moe1965 said:

a 12 hp

 

Same as my C-125...  I've been putting it off for a while but plan to get into it soon.

 

I can't find a shop locally that's willing to work on the block if that is needed.

 

 

[Snoopy11 5,714]

5 hours ago, SPINJIM said:

'assembly oil' during the rebuild

Use this...

 

 

Don

[Snoopy11 5,714]

1 hour ago, Jeff-C175 said:

I can't find a shop locally that's willing to work on the block if that is needed.

I was going to mention a machine shop I knew about... but Nevamind...  I just read that the machine shop that my neighbor told me about does not service tractor engines... (eye roll)

 

Don

Edited May 28, 2022 by Snoopy11

[SPINJIM 1,981]

 

 

 

40 minutes ago, Snoopy11 said:

I was going to mention a machine shop I knew about... but Nevamind..

 

 

Some of the Amish in my area will do rebuilds on small engines.   You probably have some Amish in Indiana who might work on them.

[953 nut 55,224]

9 hours ago, moe1965 said:

Just wondering what is recommended for a break in run time if any at all.

According to the Kohler Service manual 5 or 10 minutes is good.

 

[moe1965 738]

Started up the rebuild engine today didn't notice any difference leaving the Ballance gears out I was very sceptical on doing so but after all the research I did it was a 95   5 percent choice ,95 percent leaving them out.   Engine has a little flutter in it very speratic. carb adjustment I'm sure.. will tweak it later.   Thanks for all the help on this journey for me I have more confidence now if a nother project like this comes along.