Craftsman 27” 8.5HP (536.881851) Impleller Mod - Snowblower Forum : Snow Blower Forums
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post #1 of 18 Old 11-11-2018, 06:45 PM Thread Starter
Wxm
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Craftsman 27” 8.5HP (536.881851) Impleller Mod

Per recommendation of the member on this forum, I decided to give the impeller mod a try. The impeller of the blower is more than 1/8" thick. I would be a bit of challenge to drill through that. Fortunately, each of the blade has a 1/2” pre-drill hole. I am not sure what the holes were originally for, and decided to "borrow" them for the rubber mount.
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Last edited by Wxm; 11-11-2018 at 06:47 PM.
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post #2 of 18 Old 11-12-2018, 10:36 AM
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Wow, you got right to work! Nicely done.

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post #3 of 18 Old 11-13-2018, 12:23 PM
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I have the same Craftsman machine, with the same 1/2" hole that goes through the impeller blade, as well as a backing "U" shaped stiffening gusset that is welded to the impeller blade. Both the impeller blade and attached gusset are about 1/8" thick. That is probably why you used the 1 existing drilled hole in each blade, since you would need to driil through approx 1/4" of combined thickness if you wanted to add a 2nd or 3rd hole to better support the rubber strip. This is precisely why I have held off doing the impeller mod on my machine. Do you think 1 bolt and washer will adequately hold the rubber strip to prevent it rotating away from housing? I would be really interested on your feedback when you use this mod in snow. If it is successfull, I will do the same on my machine. Hope it works - sure would be convenient not to need to drill more holes through 1/4" with very limited room.
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post #4 of 18 Old 11-13-2018, 05:38 PM
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To drill the 1/4" holes in the blades, start with a 1/8" drill, it will be a lot easier. Also unless you are sure that your drill bits are sharp, use new ones. Piece of cake.
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post #5 of 18 Old 11-13-2018, 07:31 PM
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I was faced with a similar problem, the supporting bar running underneath of the impeller. I decided to take my impeller off and drill on the bench, which made things so much easier and more precise.

Here's how I did mine -

https://www.snowblowerforum.com/foru...ification.html

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post #6 of 18 Old 11-16-2018, 09:40 PM Thread Starter
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I used M12x25mm stainless steel bolt with a lock nut on the back, use a fender oversized washer to hold the rubber in place, I also placed a lock washer between the bolt head and the washer. I also got the relatively harder rubber, giveing the sidewall on one size, the a little lip on the other side of the impeller mounting surface, the rubber sits pretty snug. I am pretty sure I am good. Canít wait to try it in real application. Will report back.

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Last edited by Wxm; 11-16-2018 at 09:43 PM.
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post #7 of 18 Old 11-16-2018, 09:46 PM Thread Starter
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Quote:
Originally Posted by SkunkyLawnmowers View Post
I was faced with a similar problem, the supporting bar running underneath of the impeller. I decided to take my impeller off and drill on the bench, which made things so much easier and more precise.

Here's how I did mine -

https://www.snowblowerforum.com/foru...ification.html
If I have to drill it, I probably would take it off too. It would dfinitely be much easier to do it on a drill presss.
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post #8 of 18 Old 11-16-2018, 09:50 PM
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Use one hole with a torque but using flat bar stock to keep the rubber flat.

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post #9 of 18 Old 11-17-2018, 08:34 AM
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As noted above, I have the same blower and wondered if 1 bolt would be adequate to attach the rubber. I decided to try it since we were going to have snow yesterday. I did it differently than OP though, Instead of a fender washer, I used a predrilled flat bar, to more evenly distribute the clamping force of the one central bolt, along the length of the rubber strip. The rubber strips I used were 3/16" thick. The pre-existing hole in the impeller vane is 7/16" dia, so I used a 3/8" coarse thread bolt and nut, with a NordLock washer under each nut to ensure it remains tight.
We had about 4" of wet snow yesterday. The blower easily cleared it with no issues, though I am not sure there was a significant difference in performance compared to without the rubber - maybe I should have used thicker rubber than 3/16"? However, the 3/16" rubber seems quite rigid and does not bend easily.
The flat bar properly held the rubber strip in place, using only the 1 central bolt, so this seems to be a success. If you have a similar Craftsman 536.881851 this sure simplifies installing the impeller mod.
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post #10 of 18 Old 11-17-2018, 08:48 AM
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Quote:
Originally Posted by cargy2003 View Post
...However, the 3/16" rubber seems quite rigid and does not bend easily.
Hi,

I had your issue on my Honda, the rubber was too rigid. I experimented with various types of rubber material before I settled on using baler belting from Tractor Supply. It's firm enough to scrape the impeller housing of snow and ice but flexible enough that it will bend slightly at the impeller end to help clean the housing. Pic below from my mod
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