Ariens ST724 Predator Engine Swap Parts needed? - Snowblower Forum : Snow Blower Forums
 
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post #1 of 10 Old 10-02-2016, 07:20 AM Thread Starter
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Ariens ST724 Predator Engine Swap Parts needed?

Hi everyone, I found an older Ariens ST724 (From the 1979-80's I believe) this was being thrown out on the side of the road, the motor is definitely seized, I was looking to replace it with the Predator 6.5HP Engine (Harbor Freight item number 69730). Its missing the chute but the bucket and tires are in great shape. Do I need a sleeve adapter for the predator engine, if so what kind is this correct (3/4" to 1"? ) ebay item number 182161821978

Is there anything else I would need to fit this engine? Should there be anything else I should look for that would need replacement besides the chute, I will check the pulleys and belts, I've never done an engine swap before but am familiar with the process. I just don't want to put more money into this than its worth. The levers on the back are hard to depress but can be pressed (I figure some grease and sanding any rust that may be preventing it from moving) Anyone have any advice, is it worth it? other engine alternatives? Thanks are a couple photos (hope its allowed)



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post #2 of 10 Old 10-02-2016, 05:42 PM
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First check to see what size shaft, the current engine has. If it's 3/4, it may be just an easy swap over. I did a 624, and it was just a matter of swapping the pulleys onto the Predator, and bolting it down.




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post #3 of 10 Old 10-02-2016, 06:02 PM
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I believe 5,6 and 7 hp are likely 3/4" shafts and use the same mounting pattern as the Predator engine, so you should be able to reuse the pulley, cover and belt. I did 2 Ariens 724 Predator engine swaps and they were straight forward, the only 2 modification needed were to the chute turning handle (I needed to add 2 swivel joints for clearance issues) and I had to install longer studs to hold the engine to the frame.
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post #4 of 10 Old 10-06-2016, 11:20 AM Thread Starter
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Thanks all for your help, the question I have now is, is this a 1" shaft or a 3/4" according to the measurements will I need a sleeve or anything else to use the predator.





PS that puller is the most annoying thing to use they make it so hard to lock the arms in place and you have to constantly adjust it took me 2 hours but I shouldn't complain it got the job done!

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post #5 of 10 Old 10-06-2016, 11:50 AM
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oh go ahead and complain, with something that involved, complaining is allowed and justified.
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post #6 of 10 Old 10-06-2016, 12:13 PM
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It sure is a 1" shaft. you'll need an adaptor from 3/4 to 1"

Here is one
3 4" to 1" inch w Step Key Gas Engine Pulley Crank Shaft Sleeve Adapter Predator | eBay

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post #7 of 10 Old 10-13-2016, 02:11 AM Thread Starter
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Ok so I just received the chute I was missing. Does anyone know how the chute is kept in place? I was thinking if I screw it down in some way it will prevent it from rotating, how does this stay in place originally? If I move the blower the chute falls over. I looked at the repair manual and can't seem to figure it out. Also any solution that I can find at home depot would be great. Thanks



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post #8 of 10 Old 10-13-2016, 06:20 AM
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see the three small plates screwed to the underside of the chute, you should be able to remove just one and slide the chute over the ring on the bucket, reinstall the third plate and yer good to go.

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post #9 of 10 Old 10-13-2016, 08:39 AM
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You will also have to Replace the Engine mounting studs with longer ones.
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post #10 of 10 Old 10-13-2016, 12:23 PM
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Quote:
Originally Posted by nwcove View Post
see the three small plates screwed to the underside of the chute, you should be able to remove just one and slide the chute over the ring on the bucket, reinstall the third plate and yer good to go.
what he said ! those screwed on plates go under the "lip" that is on the housing and hold it in place. you may have to unscrew the other "plates" some depending on clearance in order to slide them under the lip. I'd put some thin grease between the housing and shute, top and bottom of the "lip" before you put it on. it needs to be greased and you might as well do it before you install it

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