Hot,Oilyand sluggish YM1700

[kayssupply]

If anyone knows of a thread like this let me know and I'll go there. If not, I am trying to help a guy with a YM1700 that the first symptom was getting hot. It never overflowed the catch bottle. After it had done that several times it started to smoke blue out the exhaust and the muffler is coated inside with black tar looking oil. It is using oil , like three quarts in 50hrs.There isn't any smoke or oil coming out of the crank case vent. There is a slight steady flow of clean air coming out. It develops a roughness once it starts getting warm. It starts very easy.

The radiator was flushed but not by a pro. The temp gauge was replaced. I am thinking as a place to start, a good complete cooling flush and pull the valve cover and check the oil return holes. Does ANYONE have any other ideas??? What are the signs of a clogged up muffler?

 

[kayssupply]

To date, I pulled the manifolds and there is an oily trail from the valve stem down onto the valves. The exhaust side has an oil trail out the manifold. The valve seals are shot for sure. The cylinders are smooth, with no ridge at all. The radiator is clean but the fin side was full of trash. ( I can't believe they cleaned the inside and didn't check the outside.) I plan to flush the muffler with solvent. Any other ideas would be nice.
The YM2000 water pump will be ordered with the seals tomorrow.

 

[Eddie]

I just had the same kind of problem with my YM1700. When I tore it down I found the rings worn very bad. When I removed an oil ring from the piston and put it in the cylinder there was a 1/4 inch gap. The new rings had maybe a .020 gap at most. I replaced rings, rod bearings, had head worked with new valve seals and it solved the problem. To date I have 18 hours since rebuild and still full of clean oil. Very happy with my decision to go ahead and rering. I also added the YM2000 water pump and I've not seen it go above 200 degrees even with some heaving mowing and hard tilling.

Here is a picture I attatched with the ring gap.

 

[kayssupply]

That does it. I was trying to decide whether to put in rings. For the $100 I think I'll go ahead.

 

[larso1]

I can't imagine paying $100 for a set of rings for a small 2-cyl. Yanmar engine. Have you tried DESSCO.com? They sell Yanmar engines and parts, as well as many others including my Iseki's Isuzu engine.

Bill

 

[Eddie]

I didn't pay $100 for the rings, they were like $60. Try here for your parts. You can tell exactly what you need and how much it will cost.

 

[kayssupply]

The $100 includes bearings.

 

[Eddie]

Yeah, that's more like it. It may not look like you would need it but I replaced the Head Gasket, bonnet gasket and oil pan gasket on mine too.

 

[kayssupply]

The head gasket is coming with the other parts. RTV usually works good on the others.