To Change Lower half or not

[Earthmachines]

So not sure if you guys been following me at all on this backhoe project that I have going on 580 C originally I bought this back not running brought it back to my house. Did a compression test and elite down test as were coming in at 150 to 165 psi When I added a little bit of oil to the cylinders when the heads were still attached and did a compression test, my compression went up to a roughly 300 pounds after leak test my exhaust valves were clearly leaking during the compression stroke so I pulled the head off New valves valve springs valve guides valve seals and I have the head at the machine shop now getting new stuff installed but my question is while I have it apart. Should I put sleeves piston rings in it or just put the head back on and run it I don’t see any noticeable wear And there’s no ridge at the top of the piston on the walls like you would normally see from a worn cylinder wall and rings. I’m just wondering if the added oil in cylinders during a compression test actually sealed the exhaust valves as well I used a pretty lightweight oil stuff it was mystery oil so I imagine it would’ve pushed up to the exhaust Valves as well

 

[HarleyHappy]

Meh, if there’s no noticeable ridge and your rebuilding this to just use it and run it, I wouldn’t bother.
If you’re rebuilding this to make it a show queen then you have to ask yourself, is this going to bother you?

 

[Vetech63]

An ID mic would tell you a lot. If you have wavey liners, by the time your rings seat, the ring gap has opened up past specs.............and your still losing compression.

 

[Earthmachines]

Meh, if there’s no noticeable ridge and your rebuilding this to just use it and run it, I wouldn’t bother.
If you’re rebuilding this to make it a show queen then you have to ask yourself, is this going to bother you?

Yea it’s not a show queen

 

[Earthmachines]

An ID mic would tell you a lot. If you have wavey liners, by the time your rings seat, the ring gap has opened up past specs.............and you’re still losing compression.

I do have a I’d mic I’ll check that out as well I’ll take measurements to see if consistency is there thanks for the tip

 

[clueless2]

Your reconditioned head is going to raise the compression and that will increase the pressure on the piston rings.
You may see a rise in oil consumption and some crankcase blow-by depending on the condition of the rings and liners.
What was the oil pressure when you had it running ?
Going by the condition of the head, the motor may be due for an overhaul.
An overhaul kit isn't terribly expensive.
If you were to do that you will be able to see what condition the crankshaft journals are in.

 

[Earthmachines]

Your reconditioned head is going to raise the compression and that will increase the pressure on the piston rings.
You may see a rise in oil consumption and some crankcase blow-by depending on the condition of the rings and liners.
What was the oil pressure when you had it running ?
Going by the condition of the head, the motor may be due for an overhaul.
An overhaul kit isn't terribly expensive.
If you were to do that you will be able to see what condition the crankshaft journals are in.

Never heard it run purchased in non running conditions but head was in good condition except for the two center exhaust seats reseeded but all cylinders were leaking down through exhaust valves didn’t notice any blow by thru breather tube when I did leak down as well but could have missed it because muffler was definitely filling up with air

 

[Welder Dave]

If oil in the cylinders brought up compression points to worn piston rings. If the valves are out of adjustment, oil won't change the readings.

 

[edgephoto]

Oil in the cylinders will raise compression even on a brand new engine. You are reducing volume by adding the oil. A leak down test is by far a better way to see if rings or valves are leaking.

 

[Welder Dave]

I think it would depend on how big of a difference the compression was and also the differences between each cylinder.

 

[Mobiltech]

An improvement in psi on wet test confirms ring leakage .

 

[Earthmachines]

Oil in the cylinders will raise compression even on a brand new engine. You are reducing volume by adding the oil. A leak down test is by far a better way to see if rings or valves are leaking.

This is what I was thinking as well keep in mind that this thing has not run in 10 plus years so I imagine everything is dry so adding a little oil could definitely seal some stuff up

 

[Earthmachines]

I think it would depend on how big of a difference the compression was and also the differences between each cylinder.

Each One was within 5 to 10 psi it went from 165 to 300 when I added oil

 

[Earthmachines]

Oil in the cylinders will raise compression even on a brand new engine. You are reducing volume by adding the oil. A leak down test is by far a better way to see if rings or valves are leaking.

I imagine most oil would sit in bowls reducing volume significantly

 

[HarleyHappy]

If it hasn’t run in 10 years, I expect the liners will be pitted, especially at the top but nothing that will prevent in from running another 20 years or so. Just give them a good look.
I myself would just put the head on and run it.
Don‘t worry, you will be spending enough coin, in getting all the other stuff it will need.
The money you would spend on the short block kit, could easily be spent on hoses and resealing quite a few cylinders.
lol

 

[Mike-G]

If it hasn’t run in 10 years, I expect the liners will be pitted, especially at the top but nothing that will prevent in from running another 20 years or so. Just give them a good look.
I myself would just put the head on and run it.
Don‘t worry, you will be spending enough coin, in getting all the other stuff it will need.
The money you would spend on the short block kit, could easily be spent on hoses and resealing quite a few cylinders.
lol

This is exactly what I would do as well. Since you don't know anything else about the machine you can find out what else may be wrong with it. Especially if you bought it to maintain a personal property, casual use. It will burn a little oil but it very well could run another twenty years. Just my opinion though.

 

[oarwhat]

Din't hear or Feel Nuffin, just stopped moving!! Famous Last Words.

If it hasn’t run in 10 years, I expect the liners will be pitted, especially at the top but nothing that will prevent in from running another 20 years or so. Just give them a good look.
I myself would just put the head on and run it.
Don‘t worry, you will be spending enough coin, in getting all the other stuff it will need.
The money you would spend on the short block kit, could easily be spent on hoses and resealing quite a few cylinders.
lol

I agree . Put on if it runs good Great. If it won't run, it just costs you a new head gasket and your time .

 

[stinky64]

Agree with them guys, make it run first. Don't want to jinx you but what if you spend all that loot on lower end just to discover shuttle is pooched and hydraulic pump is shot. As earlier stated, just a head gasket and your time, that machine is pretty easy for do-over.

 

[Old Doug]

You have really ask a question ??? Good luck

 

[Vetech63]

Well, Im for rebuilding this entire engine. Many pics, much booze, differing opinions……mixed with a few scantly clad young women fanning us with palm leaves.