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Allis Chalmers Discussion Forum
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Hard starting 7020

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Loon Yi

02-25-2004 22:25:36




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I have noticed my 7020 (301 turbo'd) getting harder to start. Really need to crank it over for a while and its' spitting out carbon when it does fire up. It does smoke black when lugging down, as when plowing. Any suggestions as to why it's getting harder to start and how to blow the carbon out of it?




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Wally G.

02-26-2004 18:28:13




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 Re: Hard starting 7020 in reply to Loon Yi, 02-25-2004 22:25:36  
The diesel AC's are known better for starting hard than easy, so be lucky it has started good to this point. The engine cannot build enough heat when it gets worn to ignite the fuel mixture. This is why most AC owners own stock in starting fluid company's (just a small joke). If you go for a rebuild get the Total Seal kit that has a special top ring that builds compression quicker and you will be surprises how easy it will start.

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Loon Yi

02-26-2004 21:41:15




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 Re: Re: Hard starting 7020 in reply to Wally G., 02-26-2004 18:28:13  
Thanks for the rebuild kit info, thinking about it, but dont have the ambition to undertake at this time. I do own quite a bit of starting fluid, BTW!! Are in-frame rebuilds enough once the engine gets substantial hours on it? Can new seals, bearings etc be slipped in with the engine still in place?



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Wally G.

02-29-2004 18:13:04




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 Re: Re: Re: Hard starting 7020 in reply to Loon Yi, 02-26-2004 21:41:15  
The bearings can be but not the seals. Last 4 in frames i have done had no problems with crankshaft seals leaking. You will be surprised at the condition of the bearings, probably won't show much wear but the sleeves will have cavitation pits near the bottom, this will cause the antifreeze to leak into the chankcase. That's usually the reason for a rebuild.



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