Rehabing Case 855D; tracks are very noisy; need some advice please

[viking1]

OUCH!!

Knew it was serious, sorry to see I was correct as to a rod bearing failure. May want to opt to a fully reground crank or to go with a used replacement polished and new bearings set to common size. Most likely a field fix failing rod bearing before, just did not or could not get crank clean enough to keep from repeating.

That certainly could be the case (i.e. on the field rebuild). I bought a complete rebuilt 6BT590 turbo motor on Fleabay; should get here by Saturday. I will enjoy the 70-80 more HP, but am still going to rebuild my original. Machine shop should have a diagnosis on my crank by tomorrow. It DEFINITELY looked soft, so I will need a regrind. They said rod is fine (don't ask me how).....

 

[viking1]

Rebuilt 6BT590 arrived today. Now comes the fun of installing it in 108 degrees (after a fresh coat of Case "power tan")....

 

[old-iron-habit]

I hope that with 70 to 80 more HP the rest of the drive train holds up. If we have the power us humans seem to have a need to use it all.

 

[viking1]

I hope that with 70 to 80 more HP the rest of the drive train holds up. If we have the power us humans seem to have a need to use it all.

I think since it (turbo) was an OEM option, the driveline will be able to handle it (age notwithstanding). Trust me O.I.; after all the trouble its been to replace, I will take it easy.....

 

[Dickjr.]

I was thinking that the 6BT590 was around 90 to 100 hp , unless it came out of a bigger tractor like an 1150. I've ran both case tractors non turbo and one with , in the 850 size , neither lacked any power. The t model seemed to actually have more power than needed as well. Did you get all the plumbing for the aircleaner and exhaust? Everything else should bolt up pretty well. Back to the beginning , the non turbo was about 80hp I thought. Post up photos of any changes you have to make , I find this type stuff pretty interesting.

 

[Dickjr.]

BTW what did the donor come out of?

 

[viking1]

I was thinking that the 6BT590 was around 90 to 100 hp , unless it came out of a bigger tractor like an 1150. I've ran both case tractors non turbo and one with , in the 850 size , neither lacked any power. The t model seemed to actually have more power than needed as well. Did you get all the plumbing for the aircleaner and exhaust? Everything else should bolt up pretty well. Back to the beginning , the non turbo was about 80hp I thought. Post up photos of any changes you have to make , I find this type stuff pretty interesting.

Yes Sir, its kind of tough to find Case specs that differentiate between the turbo and naturally-aspirated engine. The Dodge truck version was rated at 174 HP/400 ft lbs, so I'm assuming this engine is comparable. No idea from whence the engine originated. We have all the necessary plumbing available to throw it in, but I'm sure it will be a journey. I will have to tackle rebuilding the original engine right after too...

 

[Dickjr.]

That's not a Dodge engine with the exhaust pointing up like that and the color is wrong as well. It should have a data plate on it to specify hp. There is somewhat of a large difference between the truck engine and equipment. At any rate you have parts or spare parts.

 

[DMiller]

By the color you have a military surplus unit either for a gen set or a tractor, without knowing the codes they use today and seeing the data tag no way to determine. If was for either will be a good choice for your machine as a gen set engine works much as a tractor, put to speed and work all day. It wasn't for a truck with up pointed exhaust either.

 

[viking1]

Yes Sir, I assumed it was mil spec (and that's GOOD) because of the color. I have an 1953 M56 crash & rescue truck I just swapped a Dodge 440 Magnum into; don't make anything like all the old iron anymore. I'll post the info from the data plate tomorrow after pickup in the big city. Hoping its newly rebuilt as billed (I trust the seller). Anyone know the best break-in methods on a fresh 6BT590?

 

[viking1]

Installed and running like a champ!! 2x the horsepower; here is the initial start after install.......

https://www.youtube.com/watch?v=nocKYisTdS8&feature=youtu.be

 

[Dickjr.]

Ah the sweet smell of success! You must be pretty handy with the wrenches. Post up some more pics of the fuel inj pump and other things like exhaust mods and intake please. Could be valuable to others later on.

 

[viking1]

Ah the sweet smell of success! You must be pretty handy with the wrenches. Post up some more pics of the fuel inj pump and other things like exhaust mods and intake please. Could be valuable to others later on.

Will do. I actually have a friend who was point man on most of the tough stuff, but I was there most of the time. The engine arrived as 12 volt; we changed to the 24v starter & alternator, but wired 12 volts to the injector pump shutoff. Also swapped pulleys & belts, and the oil pickup tube. Moved dirt with it today; it really rocks now...........

 

[Dickjr.]

Got me thinking again. I have never seen an 850 size machine even up until the H model in 24v. I'm not real familiar with the loaders but I know essentially the base tractors are identical. I have been around several 850 dozers never seen a 24volt. Oh well if its working rock on!

 

[dwagidig]

I am interested in your restoration project. How is it coming along?

 

[old-iron-habit]

Good job and good to hear it run. I am curious how you wired the 12 volt circuit. Is the shutoff momentary power or continuous draw when the engine is running? Did you use a 24 to 12 volts transformer or are you pulling 12V from one battery. May not be a big deal if it only momentary to shut it off, but when you pull a 12 volt load from one battery on a 24 volt system your battery life and starting suffers as one battery is never charged correctly. Here in the cold country it's the best way in the world to freeze and break a battery.

 

[viking1]

I am interested in your restoration project. How is it coming along?

I moved over 400 tons of dirt with the machine over the holiday weekend (pics coming soon); the difference in power is astounding!!! I have a slight problem with the loader valve that forces me to find the exact sweet spot to dig. Once that is repaired though, "Katie bar the door"......

 

[viking1]

Good job and good to hear it run. I am curious how you wired the 12 volt circuit. Is the shutoff momentary power or continuous draw when the engine is running? Did you use a 24 to 12 volts transformer or are you pulling 12V from one battery. May not be a big deal if it only momentary to shut it off, but when you pull a 12 volt load from one battery on a 24 volt system your battery life and starting suffers as one battery is never charged correctly. Here in the cold country it's the best way in the world to freeze and break a battery.

Yes Sir; good call. Its wired continuous draw and pulling off of one battery at the moment. I'm going to try and find the correct 24v solenoid that fits the Bosch pump, but I'm putting small solar trickle chargers on it at the moment during down time to keep the batteries up. Not as much an issue here, as we were 100 degrees plus almost all weekend.....

 

[viking1]

I finally changed that lower roller today; boy am I glad THAT job is over. Thx to Scrub, D Miller, and all the other folks who chimed in with great advice.....

 

[Dickjr.]

I'm chiming a little late , but when working on u/c issues I have my sons friends come over , they're football players you know like lifting weights etc. " Bet you can't pick that up". " Ok then you can't put that here while I start these bolts?" On idlers and heavier things you got to challenge 2 of them as a team . They are rough on strong bars and ratchets though.