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Small Air Cooled Gasoline Engines

Homelite DP3-1 Trash Pump


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  #1  
Old 06-18-2019, 05:14:31 PM
fullchoke fullchoke is offline
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Default Homelite DP3-1 Trash Pump

I was given this interesting old pump and would like to get it running again. The 2 stroke engine is tired and needs new rings. The engine runs through a gearbox that cranks a large diaphragm. DP3 must stand for diaphragm pump 3 inch. It will pop but gradually slows down, compression is too low.
Any ideas where to get new rings and a head gasket.
While the engine is 2 stroke it isn't configured like any homelite chainsaw engine I have seen. Possibly it was used to power other equipment, any ideas there?
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Old 06-18-2019, 08:09:29 PM
Ogrebeast64 Ogrebeast64 is offline
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Default Re: Homelite DP3-1 Trash Pump

Some pics would be appreciated.
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Old 06-18-2019, 11:51:36 PM
fullchoke fullchoke is offline
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Default Re: Homelite DP3-1 Trash Pump

I decided to remove the engine to look for any numbers. I found 71070-d on the cylinder. I'm hoping to find another application for this cylinder and the piston size. It has carbon scoring over the exhaust ports and a few scratches elsewhere but not deep. The cylinder was loaded up with carbon. There is a short block for this engine on ebay but the price is over the top. The piston is not scored so I think I can re-use it, I would like to find the piston rings. Possibly someone can advise how to remove these scratches too. Can I just use 320 paper to rub them out?
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Old 06-19-2019, 12:48:09 AM
Vanman Vanman is online now
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Default Re: Homelite DP3-1 Trash Pump

As I understand it, Homelite made quite a variety of two stroke equipment, back in the day. There were different sizes of engines, and singles and flat twins. Mostly see generator sets, 1-1/2 kW - 5 kW in size. I would guess your engine is the same or similar to the 1-1/2 kW or 2-1/2 kW generator engine. The 5 kW was the twin. As far as I know, all ran at 3600 rpm, even the DC ones.

I would think to hone the cylinder. I would not use sand paper. And don't use a ball hone either, as they'll chew up the edges of the ports. You want to use a stone hone. Might find a motorcycle or small engine shop that can hone it for you.

Keith
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Old 06-19-2019, 10:40:03 AM
John Dunn John Dunn is offline
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Default Re: Homelite DP3-1 Trash Pump

I've have this one sitting in shed. Has spark and what seems like enough compression to run, I pulled and pulled, but couldn't get it going. You could have a pair! Can email more pics if anyone is interested.
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Old 06-19-2019, 10:43:27 AM
John Dunn John Dunn is offline
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Default Re: Homelite DP3-1 Trash Pump

One more pic
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