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distributor shaft oiling Model 50

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55 50

10-13-2005 07:43:50

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Operator's Manual (OM-R2033) pages 71 and 72 discusses oiling the distributor shaft. Looking at the parts catalog I don't see any oil seals listed in the area of the distributor. The lubrication is listed as #20 oil. Seems that oil would need seals to keep it in the distributor compartment. Anyone have experience with this?

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55 50

10-13-2005 18:57:00

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Re: distributor shaft oiling Model 50 in reply to 55 50, 10-13-2005 07:43:50

Thanks for the great info. I've never had that area of a distributor apart and I now understand how the oil works. Duane you mentioned "top" and "bottom" but I think that would apply to a 520 correct? The 50 has the distributor mounted horizontally.

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Duane Larson

10-13-2005 21:06:51

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Re: distributor shaft oiling Model 50 in reply to 55 50, 10-13-2005 18:57:00

55 50,
Yes, in fact my description was for the DR 1111558 when dismounted from the governor box and held vertically - but it also holds for the DR distributor on the 20/30 series which bolts directly on the crankcase.

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Duane Larson

10-13-2005 13:39:23

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Re: distributor shaft oiling Model 50 in reply to 55 50, 10-13-2005 07:43:50

55 50,
The DR 1111558 distributor bushing is a press fit at the top and bottom of the cast housing. The oil plug leads to a reservoir for oil, which surrounds the bushing and is sealed off by the press fit at the ends. The bushing material is somewhat porous to oil, so the shaft is lubricated only by the 10W oil which passes through the bushing. The rotating shaft which passes through the bushing has oil grooves cut in the shaft to move the oil up as it rotates. So, a worn shaft or bushing does not allow much leakage of oil as not much is available to leak. Now if the bushing cracks or something, that will be a different matter but I have never seen that happen (yet).

Using a grease fitting and heavy grease will not provide proper lubrication to the rotating shaft, as the unit does not get hot enough to allow the grease to pass through the bushing material. While it is a rather common thing to see, in my observation those tend to be the shafts and bushings which are worn.

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Mike M

10-14-2005 05:15:37

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Re: distributor shaft oiling Model 50 in reply to Duane Larson, 10-13-2005 13:39:23

I agree with you Duane. Also alot of these are overdue on needing the bushing changed.I have still been able to buy them through JD.

How much oil do you put back in yours after changing the bushings ? I think ? I have been filling them up until the oil is close to the fill hole holding them as they would be mounted either horz. or vert. depending on which tractor it's from. Does this sound like not enough ? or too much ?

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Duane Larson

10-14-2005 06:37:57

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Re: distributor shaft oiling Model 50 in reply to Mike M, 10-14-2005 05:15:37

Mike,
Every 1000 hours of operation the distributor should be removed, and holding it horizontal the oil plug removed and oil added until the bushing is covered, then replace the plug.

Or so says a couple of OM's, and this makes sense to me. I looked at the distributor on my G, which I rebuilt about 3 years ago, and the oil level had not dropped that I could detect but it has only been run maybe 200 hours.

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Glen in TX

10-14-2005 09:21:32

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Re: distributor shaft oiling Model 50 in reply to Duane Larson, 10-14-2005 06:37:57

Duane & Mike, Yes, I'm sure putting the oil in the Delco distributors is the way to go instead of just grease. They arent' running that long or fast and oil is what Delco recommended too. I usually put oil in the old Delcos up to the fill hole or just over the shaft. I'm use to mags that run 24/7 and those work best with grease in the old Wico XV and Vertex verticals and we run a different bushing in them too. We did run a white runny grease in the Delcos on the MM engines though.

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Glen in TX

10-13-2005 10:03:07

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Re: distributor shaft oiling Model 50 in reply to 55 50, 10-13-2005 07:43:50

Unless someone has changed it to a grease fitting it's a 1/8" NPT slotted head plug on the Delco distributors. It does have a reservoir made inside the casting to hold some oil to lube the bushings. No seals so if bushings are worn out oil won't stay long. You can put a good grade of grease in it too which is usally better and last longer. Even on a engine running 24/7 giving it a shot of grease once a week would be plenty.

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ChuckW

10-13-2005 09:17:51

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Re: distributor shaft oiling Model 50 in reply to 55 50, 10-13-2005 07:43:50

that shaft would need oiling about every 10-20 years. There is a plug insert, I always put a grease fitting in and give it a shot every 5-6 years. Other than that I wouldn't worry about it.

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