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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

d6 cat 8u

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01-28-2012 11:36:32

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Pulled head off engine to unstick the thing. Found all six rusty. Any trick I haven't tried. I soaked it with pb and put the portapower to good use pushing down on a piston. Loosened the rod I could get to and am waiting now.

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01-31-2012 19:35:59

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 Re: d6 cat 8u in reply to randyc1983, 01-28-2012 11:36:32  
Finally done. Got all sleeves out without any more surprises. I worked all day yesterday most of last night and all day today. Once I made progress I couldn't quit. But now I'm beat. I had hoped it would only need one sleeve pulled when I pushed it in the shop. Now with all six out on the floor I'm ready to look at the head. Its ugly, rain and open exhaust pipes, gotta love it.

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01-30-2012 22:58:24

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 Re: d6 cat 8u in reply to randyc1983, 01-28-2012 11:36:32  
I've got it, mostly anyway. I have removed two sleeve/pistons completely. I have one more sleeve pushed out. I have the rest of the pistons freed up in the sleeves. It will turn now. I thank all for the tips. Tried them all. Plus some others I'd heard elsewhere. Used brake fluid last and it seemed the most effective.

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Bryant Ball

01-28-2012 17:14:35

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 Re: d6 cat 8u in reply to randyc1983, 01-28-2012 11:36:32  
Be careful not to break the rings on the piston,You would be better off to just take the pistons out'
If they are that badly rusted do a proper Overhaul. The engine wont run properly anyway and you don't want to damage the liners. The liners can be honed out slightly oversize if need be.and the chances are the bottom end bearings will be no good.
you don't want to damage the crankshaft.

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01-29-2012 10:42:06

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 Re: d6 cat 8u in reply to Bryant Ball, 01-28-2012 17:14:35  
Its pretty rusted. I plan on using different liners but I need to get it apart. Plan A was to take head off and replace a liner and piston or two that stuck. I'm on plan B now, get it apart, replace jugs and rebuild. Plan C or D is to put a different engine in it. Its probly sat for at least twenty years. If only the exhaust had been covered.

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Old Magnet

01-29-2012 13:44:16

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 Re: d6 cat 8u in reply to randyc1983, 01-29-2012 10:42:06  
Get the pan off and push out pistons and liners together.

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01-29-2012 16:07:58

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 Re: d6 cat 8u in reply to Old Magnet, 01-29-2012 13:44:16  
I can disconnect rods from the access panels if it would turn. I've managed to get 1 and 6 rod cap off. I have pushed 2 and 5 sleeve and piston up a little and if I get the caps off them I can probably have those two out. I haven't gained much with 3 or 4 they are near the bottom of their stroke I'm HOPING to get the other 4 out and then push them out by rotating the crankshaft. I think it is gaining and I haven't broken anything yet.

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01-28-2012 13:54:49

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 Re: d6 cat 8u in reply to randyc1983, 01-28-2012 11:36:32  
I think it has to do with the oil in the pan, it draws the oil up the ringsto free the pistons. I have seen it work on an old rusty wallis.

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01-28-2012 13:31:49

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 Re: d6 cat 8u in reply to randyc1983, 01-28-2012 11:36:32  
I have read that some guys have put diesel in the cyl. on top of the piston and set it on fire. The heat helped break the piston loose.

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01-28-2012 16:33:17

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 Re: d6 cat 8u in reply to dpendzic, 01-28-2012 13:31:49  
Makes sense, heat usually works wonders. I may try it. Going to clean up sleeves as best I can first. Its gonna be more trouble to fix than I had hoped and its already cost me a fingernail, but it's cheaper than buying a new dozer. The trees are already shaking. LOL

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