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wd-9 issues

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maestro

06-18-2007 05:35:49




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The number one cylinder, or the cylinder that the injector isn"t fire all the time has a compression blow when I do what you suggested. I checked the others and they are OK. Now what would you suggest. I know on my super WD-6 I had some issues with the starter valves but when I took off the valve cover and hit them with a hammer and a piece of Oak board they began to work fine. Can one tighten the valve on that cylinder to help it fire. When it ran on the diesel side today it acted like it was firing some of the time. I let it run for some time and the longer it ran the better it seemed to get. Any more suggestions would be great. This is helping a great deal. Thanks, maestro

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the Unforgiven

06-18-2007 09:24:01




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 Re: wd-9 issues in reply to maestro, 06-18-2007 05:35:49  
I don't think there is a lot you can do for that starting valve with the head still on. Working that valve up and down like you said is about it, and I would be trying that for all it's worth before pulling the head. Don't get too carried away, just try to get the valve to bounce up and down under your driver. Maybe try to do it when it is warm too. See if you can get some penetrating oil on the guide/stem area, it is fairly hidden isn't it? With the engine cold, put it in the starting position and crank it a few times WITHOUT starting it, then put it in Diesel mode and see if you have more clearance under the #1 lever than the other three, this may help determine if the valve is sticking or if it is burnt. I would also be tempted to try the "blow" test when the engine is warm to test your "runs better when it is warm" theory. If that valve is sticking you should be able to free it up with enough fooling around. Did this engine sit for awhile?

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maestro

06-18-2007 10:03:57




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 Re: wd-9 issues in reply to the Unforgiven, 06-18-2007 09:24:01  
I am not sure how long or if at all the tractor sat. I know that it wasn't ever pulled very hard. I had to put in 3 new injectors to make it run the way it does now. It was an oily fuely mess when i got it. If you let it run long enough the fuel would come out the exhaust and it would also go into the crank case. The injectors have fixed that problem. My dad used to have one on the farm and he said that they need to pull. This seems better under a load so I am hoping to find somewhere dry enough to pull it. We have had lots of rain in ND so it is a wet mess. I have helped take the head off a 9 before and if I don't have to do it that would be great. Your advice has been more then helpful. keep it coming. Maestro

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Doc Larry

06-18-2007 19:51:14




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 Re: wd-9 issues in reply to maestro, 06-18-2007 10:03:57  
maestro,

I had sticking starter valve problems on my TD-6 that I was able to successfully fix without removing the head (with the help of the Red Power boys). My symptoms were similar, started and ran poorly and missed until if finally warmed up. But didn't have great power (because the compression was way too low).

The Unforgiven's advice is good.

I used a lot of WD-40 on top AND through the holes in side of the head. Which required the manifolds to be removed, not that big of a deal. You can see the starter valve stems through the side of the head. Once I was able to get any movement at all I just kept at it until the valve was good and free. I also had to pull the rocker arm and remove the caps from the top of the starter valves. As I recall, three of the four valves were stuck or sticking.
To be honest, if you are careful, you can grab the top of the starting valves with a pair of vice grips to get some initial movement. Seems brutal, but really, these only open and close a single time during the start cycle. They really don't function anything link your normal intake and exhaust valve although they are of similar design.

BTW, I think the main cause of this problem is leaving the starting lever in the starting position when the engine is off because that leaves the starting valves in the open position with the valve springs compressed. And that is where they end up stuck.

I had injector pump problems on mine, but once I got everything fixed up and running, I worked the crap out of mine (and yours truly) pushing dirt hard, and to be honest, was pretty impressed with the old girl. A 1949 model.

Good luck,

Larry

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