Impeller Modification - Snowblower Forum : Snow Blower Forums
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post #1 of 29 Old 01-15-2018, 07:37 PM Thread Starter
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Impeller Modification

I pulled the chains from my circa 1990 Craftsmans 8/26. Still have not made a decision on which new tires to get so I will run what I have if we get any snow the Toro can't handle which is not likely.

I decided to add an impeller kit. Pulled the chute and actually measured and cut some material from an old swing set then decided against using that material thinking it would be too soft and if it did not hold up I'd be cutting more holes for new paddles.

Not really a waste of time since it gave me a chance to size everything up and think the install over.

So anyone have any advice or comments? I notice the gap goes from about 1/4" on the edge nearest the engine to about 3/8" towards the augers. It seems intentional. Not sure why they would engineer that gap to open up as it heads toward the front of the machine.

The gap opens sharply to prob 1/2" just where the vane turns 90 deg and forms what I would call a cutter that I assume must chop and hold the snow to consolidate the load on the vane before it gets thrown. Should I add material onto or up to that 90 or stay back?
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post #2 of 29 Old 01-15-2018, 07:49 PM
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i usually drill/tap the holes in the impeller vanes 1st.

I'll then lay the rubber on the impeller vane and rotate the impeller holding the rubber in place...after a turn or 2 you'll locate the tightest gaps.

Once I'm happy with the rubber placement, I transfer the holes using an awl (I use an old ice-pick).

Remove the rubber and drill (or punch) holes then fasten.

Once it's fastened, turn the impeller...if it's a little tight, that's ok; the impeller housing will shave it to size. If you can't turn it by hand, you may need to trim the rubber a bit.


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Last edited by classiccat; 01-16-2018 at 06:34 AM.
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post #3 of 29 Old 01-15-2018, 11:04 PM
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The widening gap is probably the result of impeller deformation. Over time the blades press against the backing plate when under load. The gussets drive the plate back, forming a wavy back plate. That deformation cause the blades to lean inward and away from the impeller housing.

Pete
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post #4 of 29 Old 01-15-2018, 11:16 PM
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Quote:
Originally Posted by Spectrum View Post
The widening gap is probably the result of impeller deformation. Over time the blades press against the backing plate when under load. The gussets drive the plate back, forming a wavy back plate. That deformation cause the blades to lean inward and away from the impeller housing.

Pete
Sorry to say I don't agree with your logic. There is no rearward pressure to the point of deformity. The gussets are there to make it more rigid since the steel isn't all that thick. I have never seen a bent Impeller plate from only snow and besides according to your logic if the back plate bends then the Impeller tips parallel to the housing would have an uneven gap front to back.The gap was put there from the get go. Go into the big box stores and look real carefully. Brand new out of the box it has a decent gap. Only top of the line maybe are better.
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post #5 of 29 Old 01-15-2018, 11:19 PM
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just made mine w/an old tire, now waiting for some decent amount of snow to test it out

Bought a dead but now fixed 1980ish craftsman II 10/28....ITS ONE HEAVY BEAST

MY VIDS ON FIXIN HER UP

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post #6 of 29 Old 01-15-2018, 11:28 PM
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just made mine w/an old tire, now waiting for some decent amount of snow to test it out
you will love it single best thing you can do to a blower
besides making sure the motor is at 3600rpm
low rpm really effects throw distance and clogs much easier
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post #7 of 29 Old 01-15-2018, 11:38 PM
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you will love it single best thing you can do to a blower
besides making sure the motor is at 3600rpm
low rpm really effects throw distance and clogs much easier
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post #8 of 29 Old 01-15-2018, 11:56 PM
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we had a couple of inches of really heavy wet snow which i shoveled into mounds and then got the sb to finish it off, threw it a good 30', but wasnt much snow to continuously get it in the bucket .hence still waiting on a good amount of snow to fall. excited lol

Bought a dead but now fixed 1980ish craftsman II 10/28....ITS ONE HEAVY BEAST

MY VIDS ON FIXIN HER UP

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post #9 of 29 Old 01-16-2018, 01:29 PM Thread Starter
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Quote:
Originally Posted by Spectrum View Post
The widening gap is probably the result of impeller deformation. Over time the blades press against the backing plate when under load. The gussets drive the plate back, forming a wavy back plate. That deformation cause the blades to lean inward and away from the impeller housing. Pete
I don't want to dismiss this out of hand and will take a careful look at the vanes. Having said, this older machine is pretty heavily constructed (manual dated 1988/sold 1991) and lightly used. The impeller still has a lot/most of its paint.

If the vanes did flex they did it very uniformly and I would guess that that much deflection over such a short distance (3 3/4") would have leave evidence in the form of stress cracks in the paint on the underside. I will give that a good look.

I do have evidence of one ding in the impeller housing that I want to bang back into place but to my eye the impeller vanes themselves all seemed undamaged and spin w/o wobble.
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post #10 of 29 Old 01-16-2018, 03:17 PM
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In the view of many, this is the single best improvement you can make. When making it myself, I focused on the rubber used, settled on SBR and purchased a 2X36" 3/8" thick piece that worked well. You can also use neoprene which may work even better than SBR.
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