Abby’s Guide > Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) > Discussions > Ariens 910995 engine problem
Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions |
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gibson981
Joined: Jan 5, 2011
Points: 6
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Ariens 910995 engine problem
Original Message Jan 5, 2011 9:12 pm |
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I'm hoping I can get some help from this forum....or at least your opinion. Three years ago when I was transferred to Connecticut, I purchased an old (mid 70's, model 910995) ariens snowblower that I found on craiglslist. The purchase was alittle bit nostalgic, as it was very similar to the machine my dad had and used all while I was growing up, and worked great for him. For the past three years, no problems....quick to start up, and threw the snow with ease (even the heavy crap we sometimes get in CT). This fall, I changed the engine and gear oil, filled up with fresh gas, and gave the carb a couple of shots of cleaner while I let it run. It ran for about 15 minutes with no problem and I was confident it would be another good season. During the big snowstorm we got over Christmas, it did not go well. The blower worked for about 10 minutes with no problems, then shut down. No sputtering, or sounding like it was running out of gas, just died. I restarted it with no problem, and it ran another 5 minutes, then the same thing....died. I continued to clear the driveway like this, a couple of minutes of running, then die, then restart. Sometimes it would die when under a heavy load, other times not. So a couple of questions: -Any suggestions on what I can do to improve/fix this problem? The way it runs fine, then shuts down without warning, then restarts easily makes me think its more spark then fuel related. Any thoughts? I haven't done much work on small engine other than the normal mainenance, but am reasonably mechanically inclined. -Unfortunately, I have no way to bring the blower to a repair shop. My local shop will pickup/dropoff for $75. Add in another $100 or so minimum to repair, and I've spent close to 200, and still have a 30 year old engine. Looking online, I can get a replacement motor that I could put in for about 250. Doesn't this make the most sense? I'm pretty confident I can swap out the old engine, less confident of my troubleshooting/repair abilities. Thanks for reading, and appreciate any advice.
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borat
Joined: Nov 10, 2007
Points: 2692
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Re: Ariens 910995 engine problem
Reply #14 Jan 7, 2011 7:59 pm |
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The BTDC can be gotten right as I mentined but you can use just TDC and that will work well enough. If you want it a hair better you can guestimate someplace between BTDC and TDC and you'll also "well enough" plus. Friiy once said about, "It's not a funny car". True but I don't know how much would be lost by going TDC instead of BTDC. If anyone knows please post it. I'm assuming that "BTDC" means "before top dead center". If it is, this is the point where maximum ignition advance is set. In an engine with static advance, (as in an engine with points), the position where the advance is set, will be where the piston is located when the spark occurs to ignite the fuel in the combustion chamber. A static advance setting is usually a compromise to allow for a certain range of rpm. More advance at lower rpms will generate more torque but the same advance setting at much higher rpms will be detrimental to the engine, both power wise and mechanically. In a relatively low revving four stroke engine, such as used in OPE, it is desirable to have maximum advance as prescribed by the manufacturer. It will make a difference in power. While I do most of my engine work on two cycle engines, the principles of advance are the same. You should set the piston at recommended BTDC for maximum allowable advance. In this case, I'd rather have a bit more advance than not enough.
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borat
Joined: Nov 10, 2007
Points: 2692
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Re: Ariens 910995 engine problem
Reply #16 Jan 7, 2011 8:27 pm |
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Any guestimate on how much? Hard to say, but I'd bet that It will be noticeable. Particularly torque. With high performance two cycle engines, some guys like to flirt with maximum advance due to the additional available torque it provides at lower rpms. The downside is that high rpm power and reliability are compromised due to too much advance. I equipped my modified Yamaha two stroke engines with programmable dynamic ignition timing. Maximum advance is 24.3 degrees from 500 to 4500 rpm. From there, as rpms rise, I set the computer to retard advance values progressively until its at 16.5 degrees at 9500 rpm. That way, I get all the low end torque due to lots of advance and top end power and reliability by retarding it. If I were to spin the engine that fast with 24.3 degrees of advance, the engine would detonate (pre-ignite) so bad that it would destroy itself. Correct advance is important. Particularly in an OPE engine where torque is paramount.
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borat
Joined: Nov 10, 2007
Points: 2692
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Re: Ariens 910995 engine problem
Reply #18 Jan 7, 2011 10:02 pm |
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>>static advance, (as in an engine with points) Does that also apply to SSI? Interesting on the adjustable. What's the name of the device. If I google around I'll get all car stuff. Not sure what SSI is. I have an Echo chainsaw with automatic ignition advance. The acronym for that is SAIS ( Slope Advance Ignition System automatically adjusts ignition timing for optimum performance). Is SSI something similar.
The units I use on my Yamahas are made by a European outfit named MZB and Zeeltronic. There are three components: the dynamo, the controller and the programmer. All of the original electrical generating and ignition parts are eliminated and the new stuff replaces it. If you just go with the dynamo and static ignition system, you end up with an analog system. Add the digital controller and now you have programmable ignition which is programmed by plugging in the programmer and inputting the desired curves.
Here's a couple links showing the MZB system and Zeeltronic controller:
http://www.powerdynamo.biz/eng/systems/7106/71067main.htm
http://www.zeeltronic.com/page/vcdi-04.php
This message was modified Jan 7, 2011 by borat
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gibson981
Joined: Jan 5, 2011
Points: 6
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Re: Ariens 910995 engine problem
Reply #21 Jan 12, 2011 7:38 pm |
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Just wanted to give a quick update to those who helped me. We got buried in 2ft of snow last night. Ran the machine for 3 hrs this morning and not one shutdown. Earlier I had replaced the condenser and the kill wire, and cleaned up some oil on the points. Very pleased. During the last hour or so, it started to surge alittle bit, and the power seemed down. Going to clean and reseal the carb and see if that fixes it. Also the muffler blew out. Alittle unsure of that repair as the remaining pipe seems pretty fused to the engine. I'll worry about that another day, now time for a beer.
This message was modified Jan 12, 2011 by gibson981
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