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Thread: Cat 246 with blown engine, looking for parts and advice pls

  1. #1
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    Cat 246 with blown engine, looking for parts and advice pls

    Hello,
    I just bought my first skid steer. A cat 246 with a blown Perkins 3034 engine. The oil pump failed. The previous owner tried to drive it back to his shop with the oil light on after the pump failed. It didn't make it! The crank is pretty bad, one rod journal in particular. The Turbo didn't survive either..

    I have been doing some googling and looking around on this motor and have heard that there might be a problem with oil galleries being too narrow and that they might be able to be machined to reduce oil pressure.

    Seems like a pretty expensive engine to find parts for also. I am hoping to find a used crank and used set of rods. Will prob buy a new oil pump. The block is still in really good shape. Hoping to just give it a quick ball hone and put a new set of rings in it. Obviously will get all new bearings and gasket set ect.

    One guy I was talking to has swapped the Mitsubishi 3.4 into a 246 from a 246 B or C.. This sounds like quite a bit of work with the intake and exhaust being on different sides, and mounts being different. Is there an engine that anyone knows of that swaps in to the 246 easily that is cheaper to buy than the Perkins engine?

    Would be great to get some leads on used parts or new parts even.. Fixing the engine is the option I want to go with mostly..

    Some info on the motor..
    The engine is a Perkins 3034 Turbo. (3.0L)
    Perkins engine part # 704.30
    Arrangement # 147-1234
    ESN# 3NW20365

    These engines came in Caterpillar 226, 228, 232, 236, 242, 246, 248, 252, 262

    Thanks!!

  2. #2
    Senior Member powerjoke's Avatar
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    i think they came in all the skiddies not just the wheel machines you have listed.

    is the crank to bad to have turned ? we have rebuilt a few of them just out of our own fleet and we did find used parts, i think the local cat dealer located them for us.

    we have had crans turned and undersized bearings put in at a lot more reasonable cost than a new crank and yes it is a very expensive little power mill to repair but if you really want a shocker price a reman or a new one from cat, if i remember right it was about $10k for a 216

  3. #3
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    Try to find a burned or smashed one at salvage. Or like PJ said undersize the crank. Core value is 5K. If you google the history of that engine its made by PERKINS SHIBAURA ENGINES in china. Not a bad unit except for the oil pickup tube issue... The A models were the best made units.

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    Thanks for the replys!
    I thought the engine with the oil pickup tube problem was the smaller engine.. Can't remember the displacement 2.4 maybe? This oil pump cracked in half basicaly I'll try to post a pic of the crank and the oil pump. I should see if there is a machine shop that repairs cranks locally but kinda doubt it I tried to get a 2 stroke boat crank done a while back and nobody would touch it. I would ship it out if I have to though..

    Good to hear that the A models are the best made! Can't wait to get this thing goin!

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    swap in a cummins 4BT.

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    Man that would be sweet, I looked into a little bit but didn't find anything on it. I wonder if it physically fits being a 3.9 litre vs the Perkins 3.0... Do you know if it's doable?
    Thanks for the reply.

  7. #7
    Founder Steve Frazier's Avatar
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    I had the same thing happen with my 248 except #4 rod cracked the block. I bet that's your worst bearing too. I did some research and found this to be a common failure with this engine and complained to Cat. They helped me with engine replacement even though my machine was outside the warranty period. I had considered a different engine too, I was going to try a Cummins 4BT as they are super reliable and fairly inexpensive. It would have required a lot of adapting, but as I mentioned I ended up getting help from Cat for a rebuilt Perkins. You can read my experience here

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    Hey Steve thanks for the reply,
    That's great that Cat helped you out. I read the thread, too bad it was down for so long but still great that they helped you out. My machine has 4200 hrs on it. And I bought it blown up. I'm going to try to contact Cat today. I especially want to find out if there is a known problem with the size of the oil galleries causing too high of oil pressure and the failure of the oil pumps. I really doubt they will do anything for me but man that would be amazing if they did!
    I think my rod journal that is the worst is #4 as well. Luckily no damage to the block in my case. Just hoping the right person will see this thread and have a crank and rods laying around!

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    Founder Steve Frazier's Avatar
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    That looks like a similar point of failure to mine.

  11. #11
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    I have the same problem with my 246. The oil pump broke the casting just as yours did and I spun all my main bearings. I bought a new surplus block from my local cat dealer for 1450.00 (thru cat used parts) and bought a good crank from Schaefer Enterprises for 750.00. The rings, seals, gaskets and bearings were another 1050.00 from cat. Cat also offers a rebuilt short block for 4500.00 with a core charge on 450.00 and a new short block0for 4950.00 with a 500.00 core charge. as long as your core is put back together and it will spin over regardless of the shape the bearings are in, they will accept it as a core. Good luck

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    $750 for the crank is great compared to the $3200 Cat wants for it! I am in Canada where everything is more expensive.. I'll check out Schaefer. Thanks for the lead! What did you do about your turbo?

  13. #13
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    Turbo is in great shape. I had to buy the timing cover from Schafer for 125.00. When my oil pump broke, it but a gouge on the machined surface that the pump rides on. total cost on all the parts was just under 3600.00 so I think I did pretty good. My Cat dealer gave me a price of 2284.66 for a new crank. part # 173-1280

  14. #14
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    I have a Cat 246.... Reading these engine threads scares me...does anyone know if the new oil pumps have been improved so they do not crack?This is a pretty big engine defect that is costing owners a ton of money to repair..i have 1800 ish hours on my machine, and I'd rather deal with this before I loose oil pressure than when I need an engine...

  15. #15
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    Quote Originally Posted by John DiMartino View Post
    I have a Cat 246.... Reading these engine threads scares me...does anyone know if the new oil pumps have been improved so they do not crack?This is a pretty big engine defect that is costing owners a ton of money to repair..i have 1800 ish hours on my machine, and I'd rather deal with this before I loose oil pressure than when I need an engine...
    Yeah no kidding! I'm still trying to find out if the size of the oil galleries are a problem. Or maybe just the pump being a cheesy pot metal POS.. I guess if you lose oil press don't make the same mistake as others and seize er! Shut er down!

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