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Farmall & IHC Tractors Discussion Forum
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D-155 (D-179) 3 cylinder diesel engine question

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Doug in Pa

07-09-2007 18:23:36




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I have a 500-C crawler with D 155 engine that I seem to be having a tinming problem with. This is basically same engine as D 179 thats used in a lot of I H utility tractors. I took off the front cant see how the crank gear is located on the shaft, I see no key, or keyway. Also how do you get the gear off? I hope someone here has had some experience and can help, thanks




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Janicholson

07-10-2007 06:43:18




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 Re: D-155 (D-179) 3 cylinder diesel engine question in reply to Doug in Pa, 07-09-2007 18:23:36  
Doug, I posted more info at the earlier posting, check it out. The issue is almost certainly not that gear (from the answer given here about how to get it off the shaft, pretty permanent tactic to remove it) Good luck, JimN



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MN Scott

07-09-2007 20:34:19




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 Re: D-155 (D-179) 3 cylinder diesel engine question in reply to Doug in Pa, 07-09-2007 18:23:36  
I looked it up in my IH engine manual. The gear is shrink fit. To remove split gear with cold chisel at its timing slot. There is a roll pin behind gear to index it to the crankshaft. To install new gear heat it to 400 degrees and install it tight to journal over the roll pin.



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MN Scott

07-10-2007 10:24:00




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 Re: D-155 (D-179) 3 cylinder diesel engine question in reply to MN Scott, 07-09-2007 20:34:19  
One thing I want to add on valve timing on that engine. In order for the pump or valve timing to be off enough not to run the gears would have to jump several teeth. This would be easy to see as the gears would be chewed up with missing teeth.



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Doug in Pa

07-10-2007 14:33:36




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 Re: D-155 (D-179) 3 cylinder diesel engine question in reply to MN Scott, 07-10-2007 10:24:00  
Yeah, thats the trouble, the gears look good, but I can't explain why I get nothing when I shot ether into it, nothing at all, to me it leads me to think valve timing and nothing gets into the cylinder at the right time. When I took off the timing cover I was expecting to see some damage, or maybe a sheared key, but since that crank gear is a shrink fit, seems tha's not the problem. But, how else could the timing get wacked out? When the motor died it happened gradually , like about 10 minutes getting worse, missing and black smoke until it died.

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Bob Farrell

07-11-2007 11:21:47




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 Re: D-155 (D-179) 3 cylinder diesel engine question in reply to Doug in Pa, 07-10-2007 14:33:36  
I think you may be thinking wrong - therefor - looking in the wrong area for a fix. Sounds like it is starved for air. Look carefully at the air intake "system" Sounds to me like the grimlins have it plugged. I have a IH 424D that I was bushhogging with one day. A little black smoke started coming out the exhaust although the tractor was not loaded. Finally it was just black, black, black smoke and no power. Loaded it up, took it to the shop, and found that wasps had built a nest in the intake and it finally shifted untill it almost completely blocked the air flow. (I had serviced the oil bath a couple days earlier). Hope this helps.

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Doug in Pa

07-12-2007 19:15:13




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 Re: D-155 (D-179) 3 cylinder diesel engine question in reply to Bob Farrell, 07-11-2007 11:21:47  
Thanks for the idea, but I had the intake hose off, and nothing was inside the manifold



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Skeeter 1

07-24-2007 15:25:24




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 Re: D-155 (D-179) 3 cylinder diesel engine question in reply to Doug in Pa, 07-12-2007 19:15:13  
Doug, I have same problem here right now. Did you figure it out. Tractor smokes excessively black if you can even get it to start. I have air tubes all off to manifold. Fuel return line not plugged. Pump and injectors gone thru. Recent engine overhaul at a Case IH dealership. They said it never ran good when it left there. Couldn"t figure it out and kicked it out the door. Pulled timing cover. Lined up all timing marks. You can turn engine over a bunch of times and timing marks will never ever line up again. Gear is not slipping on crankshaft or camshaft.

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