update on my 5000

I am so very glad to have all you guys here to help me out.
My last thanks was fairly uni-directional towards Bern, but
all of y'all have helped tremendously! Here's what I know
now...the bores are 4.2, which is a good thimg since that's
the gasket I ordered. That first piston (#2 I think?) the one
in the front of the tractor is definitely loose. I used all eight
of my arms to get around the loader with a cresent wrench
on the bolt head, I could rotate the crank back and forth.
Then, with my tongue on the piston itself, I could easilly
feel the piston "jump" while rotating.back and forth.
This means there is something wrong where the piston
connects to the crankshaft, correct? Bearing, bushing etc.
can be the problem, but the question for me is how to find
out, and how to tell which it is. I failed to bring my manual
from the barn, so right now I'm blind, but some quick info
from you guys would do me some good.
Also, I think this is for sure my knocking problem, but what
about the bubbles in the radiator?
 
Either a bad bearing or bad wrist pin. Only way to find out is drop the pan and pray it's a wrist pin. If it's a bad bearing you'll likely need to remove the crank which will mean a full split...
Head gasket may not even be related to this... or it might be due to the efforts of whomever built the engine.
Dig in and see what you find. All you can do with it right now.

Rod
 
That must have been quite a sight with your tongue on the piston. Did you taste, er, I mean feel the other pistons as well for a comparison? It would suck to pull the pan only to find out that you were imagining things.

I already discussed pulling the pan in a previous post. Once the pan is off, remove the rod cap and push the piston out. You should see/and or feel the problem soon enough. Do all 4 while you're at it.
 
Ok, thanks again. I did taste and feel the other pistons, and felt no movement on those. I was wanting to get this done ASAP....correctly, but as soon as I can-I've got hay to cut! So, that being said, I would like to order my parts, even if it's a part that I might need only to return it. Can you give me a list? Pan gasket, wrist pin, bushing come to mind. I'll wait on a bearing. Anything else?
 
I would order 4 wrist pin bushings if indeed that is the failure, and do them all - they are not that expensive. A machine shop will need to install them because they have to be reamed to size after installation in the pin bore. You will also likely need a rod if the bushing has spun in the bore - a reputable machine shop will not re-use a rod like that.

You can't order rod bearings yet until you know the size of the rod journals, as the crank may have been ground in the past.

In a perfect world the piston rings would be replaced also, but there again, you'll need to know the exact bore size before you order. This cannot be measured with a tape measure, but a calipers will get you close enough. *Usually* the pistons are stamped on the top if they are indeed oversized.

The good news on the head gasket is that there is only one choice if indeed the bore is 4.2". A pan gasket and gaskets to mount the balancer and oil pump are the only other items that come to mind.
 

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