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Post  fit90 Sun May 01, 2016 7:37 pm

I have. a couple months ago I purchased a Silver Swallow 1.5cc Diesel engine form ebay. It looked pretty but was frozen and had some odd wear marks. Anyhow, I got the engine moving nicely and decided to try it out, today. I got it going easily enough. But, I was having trouble getting a good, steady needle setting. After a little look I discovered that the nut holding the spray bar was loose. I started to tighten it and then discovered that the spray bar was badly cracked and ready to break in two. After replacing the whole NVA I got it runnng again. It isn't a monster performer but it still ran very nicely. I decided to shut it down and try a hot start. Whoa, what is this? Suddenly, the prop is spinning withut turning the engine over. A little more investigation revealed that the crank shaft appears to be tapered and the threads that hold the prop nut are also tapered and badly worn. A thread file did little more than make the threads shiney. I sent an email to Mr.Carlson of Carlson Engine Imports to see if he has a crank shaft and prop nut. If not, does anyone think it is worth it to rethread the crank? I really don't want to have to go that far for an inexpensive ebay engine. But, I don't know if I am capable of leaving an engine so close to running condition without repairing it. Also, does anybody know how hard the metal for the crank shaft on this engine is?
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Post  Ken Cook Sun May 01, 2016 8:09 pm

Bob, the Silver Swallow ( Yin Yan ) diesel engines were pretty low in quality. I happen to have one here that actually runs real well. I think it would be easier to find another engine opposed to finding a shaft. My example here seemed to take forever to break in. The piston was amazingly unstable and would grow. I had to lap that piston into the liner several times until it stopped becoming problematic. It now starts quite easily and reliably. Ken
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Post  fit90 Sun May 01, 2016 8:33 pm

Ken,

Thanks for the insight regarding the piston fit. That might explain why my engine would suddenly shut down like it was over conpressed after runing for just a few seconds. I thought I was doing something wrong but couldn't figure out what. The engine always started right back up without issue so I didn't give it too much thought. If Mr.Carlson doesn't have a crank shaft available I will probably take a crack at rethreading the crank shaft myself. If the crank material is soft enough for me to do it then I know the engine will be very delicate and probably have a very short life. Oh well, I guess it is all part of the learning curve. From what I have read these engines are really hit or miss. Looks like I might have gotten one of the rotten ones. I am glad yours runs well.

Have you had any further luck with the dieselized black widow?

Bob
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Post  Ken Cook Mon May 02, 2016 4:17 am

I had the Black Widow running with the Davis Diesel head pretty reliably. I found that I just need to quickly reduce compression once running and richen the needle. After about 30 seconds I have to back off the contra piston a bit more and all seems to stabilize. I feel there's enough rpm's to fly a 1/2A with a bit of authority. The exhaust residue appeared to be not showing signs of over compression. Ken
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Post  fit90 Mon May 02, 2016 6:52 am

How does the exhaust residue look when over compressed?
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Post  fit90 Mon May 02, 2016 9:08 pm

Ed Carlson of carlsonengineimports.net has saved the day. He has everything I need and at a very reasonable price. As always, he has been great to work with, as well. Thank you Mr. Carlson!
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Post  Ken Cook Tue May 03, 2016 4:09 am

Bob, typically when over compressed the oil residue is usually very dark. I look for more of a dark honey rather than a blackish Coca Cola look. I'm glad to see Mr Carlson is still doing well, he's been very supportive to the hobby. Ken
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Post  fit90 Tue May 03, 2016 7:38 am

Ken thanks for the tip. Since I am still learning about diesels tips like that go a long way to helping me be better to the engines. Yes, Mr. Carlson has been great for the hobby. Every time I have talked with him he has been incredibly knowledgable and helpful. Plus, he is just a nice guy. I hope he enjoys what he does.
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Post  fit90 Sun May 08, 2016 1:00 pm

Got the new crankshaft and prop nut. Before I installed them I drilled out the venturi, cut it down a bit and installed a PAW 1.5cc carb. Everything is all put back together. In spite of all I have to do today, I am hoping to run it this afternoon. Of course, I am hoping for a strong runner with impeccable throttle response. I am expecting an ok runner with recognizable throttle response. We will see.
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Post  fit90 Sun May 08, 2016 4:35 pm

I don't know what the standards for good and bad diesels are yet, but I know what makes me happy.  This engine makes me happy.  With a MAS 8x4 it had an ultimate high end of 11,500 RPM.  After I backed the compression off a bit it was running between 11,300 on the high end and idling between 5,400 and 5,500 RPM with a clean throttle response.  This is way better than I ever hoped for.  I am really starting to dig the diesels.  Now all I have to do is learn to tolerate the smell associated with them.  Does anyone have a solution for that?

Pictures coming.
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Post  Ken Cook Sun May 08, 2016 5:21 pm

Bob my friend Dennis suggested to me to use lamp oil scent and mix it into the diesel. Apparently they make lemon and vanilla. I never tried it, He says it works great. Ken
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Post  fit90 Sun May 08, 2016 6:08 pm

Thanks Ken. I need to try something. I made a meat loaf tonight but could only smell the diesel residue. It broke my heart. Maybe I can find a meatloaf scent.
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