Heater core leaking

This topic contains 5 replies and was last updated by will-tilley 8 years 11 months ago
February 4th, 2013 12:13am
I have a problem with a heater core on a Kobelco 210LC mark 8 excavator.When the origional core gave out I replaced it and got about two weeks out of the new one and it started to leak.Warranty gave me a new one and that lasted about a week and that one started leaking.I put shut off valves on the hoses so we could continue to use the machine.Without the core the machine runs fine and if I had engine problem it should show up but nothing.I was wondering if anyone else has had a problem like this?I am wondering if it is just a bad batch of cores?
February 4th, 2013 7:47am
Is there a copatibility issue between antifrezeer composition and cooler material (the newone)?
February 17th, 2013 6:00am
Will I would guess you're getting inferior quality cores. I had a problem with GM cores one time and just kept changing them until I got a good one. A pain in the tush but the dealer thankfully sympathetic. There is no way to foul up installation of a heater core so the only answer is poor quality material or assembly.
March 10th, 2013 5:23pm
Hi Will,

I had that problem once before. I am a Kobelco tech and I remember this problem from a little while ago. If you look at the heater core, no wonder its leaking. The whole airbox in that machine is a problem. Unfortunately I cant exactly remember what the solution to the problem was. Maybe the rad cap? Also this machine does not use a heater valve, It just mixes the air to obtain the desired temperature.

I will find out how we resolved this issue and let you know.
March 15th, 2013 11:22pm
Hey Andy I look forward to hearing from you on this problem.Our Kobelco dealer recently went under and now the Case dealer is filling in until a dealer becomes availible. I got them to check into it and they came back with left over casting sand in the block which is now loose and traveling in the system.I have a few issues with this #1 why after four years of running fine is this a problem now? #2 why am I not having issues when the core is shut off with the valves.I am leaning towards what John said about the faulty cores,but at $1100.00 a pop and warranty not covering them I can't keep on putting them in.I think I'm going to maguiver an automotive core in and see what happens.Thanks guys for all your comments and keep them coming.
May 26th, 2013 11:34am
I have drilled over holes in crown gears with a masonary drill bit but you have to grind it to a thirty degree angle more like a regular drill bit and re-sharpen it often during use.Oh and you will need a carbide or diamond grinding wheel to sharpen it.Good luck.

Thanks !!!

Rachel !!!

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