Major overhaul of K301

[Mickwhitt 4,642]

Going through the process of stripping the engine down today. Writing down each step and taking photos for reference. 

 

This is where I got to before time was called by the boss lady.

Plenty of oil on the piston crown. And this is after not a lot of run time. 

I'm happy we all decided to get on with this engine rebuild lol The piston marked STD so I take it that's for standard.

Over here STD means something altogether different lol.

 

 

[squonk 41,164]

Look closely at top of the piston that ends up closest to the exhaust valve at TEC See if there is any erosion.

[ebinmaine 67,695]

1 hour ago, Mickwhitt said:

Over here STD means something altogether different

Supreme

Tractor

Display

 

[Mickwhitt 4,642]

Ok, engine is stripped down to just the crank case and cam shaft/valves.

Im going to replace the ball race bearings on the crank, they feel ok but while its down I may as well get a pair.

The big end is definitely ovalised and I can feel the wear step in the cylinder. So it was definitely time fore a rebore.

I will take the crankcase through to my machine shop next week when the snow has cleared and get it measured ready to order the parts. 

Anything else I should be looking at while the engine is in bits?

Mick 

[richmondred01 2,237]

The cam will need to come out to remove the bearing. 
watch the cam shim. Don’t loose it. 

[WHX?? 48,834]

I like to put marks on the cam shaft rod so it goes back in the way it was. 

[WVHillbilly520H 10,373]

11 hours ago, WHX24 said:

I like to put marks on the cam shaft rod so it goes back in the way it was. 

I honestly think the K301 I can't get to run at WOT had been apart before I got it and was put back together wrong, something has to be off after all I have done to it has no power and backfires through the carb and shakes like a dog crapping razor blades.

[richmondred01 2,237]

4 minutes ago, WVHillbilly520H said:

I honestly think the K301 I can't get to run at WOT had been apart before I got it and was put back together wrong, something has to be off after all I have done to it has no power and backfires through the carb and shakes like a dog crapping razor blades.

If you want bring it down to Richmond, drop it off and I’ll pull it down and take a look. 

[WVHillbilly520H 10,373]

Just now, richmondred01 said:

If you want bring it down to Richmond, drop it off and I’ll pull it down and take a look. 

Might be a while, I hate pulling them out of those Quietline Cubs dang shaker plate mounts, with a clutch.

[richmondred01 2,237]

Oh yes. They are a pain. Those three Allen set screws big pain. 
 

[ebinmaine 67,695]

31 minutes ago, WVHillbilly520H said:

 shakes like a dog crapping razor blades.

OW. OW. OW. OW. OW. OW. 

[Handy Don 12,244]

42 minutes ago, ebinmaine said:

OW. OW. OW. OW. OW. OW. 

If there was wince emoticon, I'd have used it!

[Mickwhitt 4,642]

The cam is out, no apparent issues there.

The crank bearings look ok but now they are out I will replace them. Looks like the crank may have been spinning inside the inner race so a bit of bearing lock is in order when it goes back together. 

Just the valves to remove, need to fashion a spring compressor as buying one would be a waste of money for this one job. 

Then the valve guides, then off to the machine shop.

[richmondred01 2,237]

Cam clearance should be .005-.010.

thats were the spacer shim goes.

[Maxwell-8 4,277]

On 1/13/2021 at 11:47 PM, Mickwhitt said:

Is that how a piston of a k301 should look like?

 

I have a kohler, somebody tried to rebuild  but man, it burns more oil than gas, and you can stick a nail between the piston and cilinderwall

[ebinmaine 67,695]

2 minutes ago, Maxwell-8 said:

burns more oil than gas, and you can stick a nail between the piston and cilinderwall

Not normally done that way but... 

[Maxwell-8 4,277]

4 minutes ago, ebinmaine said:

Not normally done that way but... 

The pistonring seals that area, so it has pretty decent compression, but it just burns oil, it is riding like a steam train with all the smoke.  And the oil dripping from the exhaust

Edited January 16, 2021 by Maxwell-8

[richmondred01 2,237]

It needs to be torn down if it’s burning that much oil.

could be a broken/stuck ring or valve guides and or both. 
 

 

[Maxwell-8 4,277]

23 minutes ago, richmondred01 said:

It needs to be torn down if it’s burning that much oil.

could be a broken/stuck ring or valve guides and or both. 
 

 

If have had the valve on, it's a motor i gat for free as a spare, so it ain't in use, ring is good, just a wrong cylinder size, strange it still makes 100 psi compression though.

 

How would valve guides lose so much oil? and isn't the block shot if it would leak that bad tru those guides?

 

Edited January 16, 2021 by Maxwell-8

[Mickwhitt 4,642]

The piston looks pretty clean, but the skirt is scuffed both sides and there is an area of damage where the exhaust valve is, as mentioned by someone earlier. All the rings were intact.

The big end bearing is marked and worn.

 

Valve guides would allow oil into the manifolds by leakage between the valve stem and guide, not the guide and crank case. 

 

[Maxwell-8 4,277]

5 minutes ago, Mickwhitt said:

Normal wear for such an old engine

 

 

Valve guides would allow oil into the manifolds by leakage between the valve stem and guide, not the guide and crank case. 

 

Normal wear for such an old engine

 

And those Valve guides, it's a small area, would they really leak that much oil that the engine is almost struggling to keep running because of the amount of oil?

Edited January 16, 2021 by Maxwell-8

[lynnmor 7,315]

What I am seeing is an engine in great shape however precise measurements will tell the real story.

 

Unless valve guides are extremely worn, there won't be a lot of oil going by them.

[richmondred01 2,237]

There are two conversations going on in this thread with two separate issues. 
maxwell and mickwhitt 

[Mickwhitt 4,642]

Yes those are photos of my engine not maxwell, it sounds like his is way bad and the only way to diagnose issues is to tear it down as I have done. 

 

[Maxwell-8 4,277]

2 minutes ago, Mickwhitt said:

Yes those are photos of my engine not maxwell, it sounds like his is way bad and the only way to diagnose issues is to tear it down as I have done. 

 

 

6 minutes ago, richmondred01 said:

There are two conversations going on in this thread with two separate issues. 
maxwell and mickwhitt 

 Srry guys.