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WAY Way Way off topic lawnmowers (Page 2)
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ProwlerOnline, Plymouth/Chrysler Prowler Discussion Forum
Off Topic
WAY Way Way off topic lawnmowers (Page 2)
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| This topic is 2 pages long: 1 2 This topic was originally posted in this forum: Tires, Rims Discusssion |
| Author | Topic: WAY Way Way off topic lawnmowers |
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ed monahan Prowler Junkie Posts: 33595 |
posted 04-14-2002 08:55 PM
I fixed an elderly (Yeah, even older than me) ladies lawn mower last week after she hit a piece of metal in the yard. The sheer pin was down on a bracket holding the blade. Has anyone else ever seen that? How does that sheer pin prevent the engine from running since it is not controlling the magneto or timing? I had never seen anything like it but my oldest son said he was aware of it. I can't figure out how it works. ------------------ |
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fixumm Prowler Junkie Posts: 3056 |
posted 04-14-2002 09:14 PM
never and i have worked on a lot of them ????????????? I STILL DON'T UNDER STAND FIXUMM ------------------ |
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CJ Prowler Junkie Posts: 18860 |
posted 04-14-2002 09:57 PM
Ed..........here's a reply from Bob. Many engines that operate in a dangerous environment such as outboard motors and lawnmowers, often use a soft drive pin. The purpose of the pin is to allow the blade or propeller to stop turning suddenly upon an impact without damaging the drive mechanism or internal components. The lady obviously hit something that caused the blade to suddenly stop. Without the sheer pin, internal engine parts would have been damaged. Hope this helps! |
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ed monahan Prowler Junkie Posts: 33595 |
posted 04-14-2002 10:01 PM
CJ, I understand all of that and I totally agree. I took the top of the engine apart to replace the sheer pin, which is similar to a fuse in an electrical system. It is the built-in weak link. In this case, it is not in the engine but at the other end of the shaft, down by the blade. The engine would not start without the sheer pin/bracket and in fact would "kick back". The last part is the baffling part, to me. Why would a part not inside the engine, prevent the engine from starting? ------------------ |
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sunbird Prowler Junkie Posts: 595 |
posted 04-14-2002 11:19 PM
Ed, the weight of the blade is probably computed as being part of the 'flywheel'. Without the inertial of the blade, the crank loses momentum against the pressure of compression and can not continue through compression and ignition and such. The fact that it kick's back verifies this. The inertial is near zero at compression and ignition is so close to TDC (top dead center) that upon ignition the crank can go in either direction. Get the flywheel, I mean blade back on and try it again. If that doesn't do it, check ignition timing. The impact could have sheared the key holding the fan/magneto/flywheel to its shaft thereby changing the ignition timing. ------------------ This message has been edited by sunbird on 04-14-2002 at 11:20 PM |
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ALLEY CAT Prowler Junkie Posts: 36093 |
posted 04-14-2002 11:50 PM
Ed - buy the lady the Binford 6000 riding lawnmower like the one they had on TOOL TIME. 0 to 60 in 5.2 sec Don't forget to attach some Prowler flags on the back! ------------------ AlleyCat Productions, Inc |
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ed monahan Prowler Junkie Posts: 33595 |
posted 04-15-2002 12:12 AM
Sunbird, I already bought the bracket for the blade, which has the shear pin built right in it, and replaced it all and it fired on the first pull. I was amazed. After reading your post I am amazed again. Thanks for the information. I knew someone would know a lot more than me about engines. The part cost $4.25 and it is an old Craftsman mower, at least 15 to 20 years old. I had never run into that type of set up before. I was familiar with the old type shear pin in the crank. Sasquatch, I recommended a self propelled or at least a push mower with the larger rear wheels and she didn't think she could handle it. She is in her 70's and cuts about 3/4 acre and it is not level. ------------------ This message has been edited by ed monahan on 04-15-2002 at 12:14 AM |
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sunbird Prowler Junkie Posts: 595 |
posted 04-15-2002 11:26 PM
Ed, good thing it was a 4-stroke. A two stroke would have really amazed you - they can run backwards! ------------------ |
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ed monahan Prowler Junkie Posts: 33595 |
posted 04-15-2002 11:43 PM
I have a new lawn mower story. Today I was cutting Sandy's lawn on her riding mower. Suddenly I felt like it was not turning correctly. I looked down and the right front tire was off the rim. I suppose it was very low on air and as I went down a slight grade and turned it hard the tire lost its seal on the rim. I took it off and went to a tire store and it took them about 15 minutes to get it to inflate. Not holes, no damage. I guess it is time for everyone to check the tire pressure on their riding mowers. I promise it had nothing to do with my weight.  It could happen to anyone!!! Two other tires were seriously low on air pressure. ------------------ |
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sunbird Prowler Junkie Posts: 595 |
posted 04-17-2002 11:28 PM
Ed, I don't think you mentioned how old the lawn mower or tires are. My guess is that the tires are so old they have hardened and lost their 'stickyness'. The hardened rubber is just refusing to seal on the rim. I'm not a tire man, but that is my guess. ------------------ |
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ed monahan Prowler Junkie Posts: 33595 |
posted 04-18-2002 12:38 AM
Sunbird, the lawn mower is two years old at most. The tire was still plenty flexible. In fact, flexible enough to flex right off the rim. It was due to low pressure or basically no air, at all. ------------------ |
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sunbird Prowler Junkie Posts: 595 |
posted 04-19-2002 11:13 PM
I was thinking about your statement about them having a hard time mounting the tires and having the tires hold air, but it is all academic if the mower is only two years old. I would expect hardening of the rubber to happen long after five years. You've got me stymied on why the repair people had a hard time with the tire. But as I said, I'm no tire man. ------------------ |
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ed monahan Prowler Junkie Posts: 33595 |
posted 04-20-2002 12:18 AM
Sunbird, they had a hard time getting both sides of the tire to stay out on the rim so that the air going in the valve stayed in the tire. The bead of the tire is narrower than the rim before it is inflated. For automobile tires, which of course are much bigger, they have an air wand that is round that they put near the bead. In the old days we used a metal strap around the circumfrence of the tire but I would imagine a few of them broke and people were killed or maimed. ------------------ |
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WILD THING Prowler Junkie Posts: 782 |
posted 04-20-2002 05:23 AM
ed there is a simple resolution to what happen, you broke the finnagan pin to the waffle shaft! So you see that's why she's not spinning |
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ed monahan Prowler Junkie Posts: 33595 |
posted 04-20-2002 06:54 AM
I don't think that is correct since I had just lubricated that. ------------------ |
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WILD THING Prowler Junkie Posts: 782 |
posted 04-20-2002 05:23 PM
ahhh yesssssssss! but did you lubricate the right end????? |
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WildCat Prowler Junkie Posts: 6862 |
posted 04-21-2002 04:16 PM
ED today they should use a band that is inflated after going around the center of the tire, NO STEEL BAND  I have one that I use for those hard to air up tires. ------------------
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