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Arctic Cat: M Series 2005-Current, all models in the M-series chassis
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Old 01-26-2010, 12:07 AM
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Thumbs up How I installed my BDX oil delete kit

I pulled the engine, split the cases, and milled a few pockets with a 1/2" end mill to collect oil. Then drilled a 3/16" hole to direct oil onto the gear that drives the water pump shaft, and another to direct oil behind the bushing in the oil delete kit. You could do all this work with a die grinder and a hand drill. I'll let the pictures speak for themselves.





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Old 01-26-2010, 12:20 AM
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Not to bust any chops here, but I don't understand? What is this oil hole in the picture going to do, or did you drill through the oil delete too? That would make sense if you did I guess. Also, what happens to the fuel getting sent into that sealed cavity with the oil? The crank bearings seal that compartment from premix getting in or out. That's why guys grease the waterpump shaft through the zerk they put in the bottom.

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Old 01-26-2010, 12:26 AM
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More pictures here.
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Old 01-26-2010, 12:29 AM
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Ok, so it looks like you went through the oil delete piece too. That will work, but I still don't understand how the fuel gets burnt going into this cavity? Thanks for the pics.

Aaron
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Old 01-26-2010, 12:37 AM
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The hole you circled goes through the lower case, through delete kit, into the cavity behind the oilite bushing. This receives oil slung off the crank gear. The crank gear receives oil from the hole drilled in the upper case.
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Old 01-26-2010, 12:42 AM
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My take on it is that the oil/gas mixture will swirl around and exchange out through the bearings. There is no seal there. The snopro engines have a very similar port/drilling set up in the upper case to what I have done, but they dont have the hole through the bdx kit.
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Old 01-26-2010, 12:50 AM
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Guys are greasing through the threaded hole in the bottom of the case, or are they greasing through the front of the delete kit, through a hole they drilled and tapped themselves? It doesn't make any sense to me to grease through the hole in the bottom of the case, but if it works, it works.
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Old 01-26-2010, 09:03 AM
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They are greasing through the hole in the bottom of the case right under the waterpump gear to lube the waterpump/crank gear teeth. Supposedly the oilite bushing in that BDX oil delete doesn't need oil. Here is a post from another thread:

Researching and putting a lot of thought into doing the BDX oil delete kit myself a few weeks ago, I honestly think you had trouble because we need to mix a stronger premix than BDX recommends. Maybe like 32:1 instead of 40:1. Looking at the pictures below of a M1000 case, you will see that the center section where the waterpump shaft is, is completely sealed off by the inner crank bearing seals. In the second picture, I also marked where the oil ports are on the outside of these seals in the case, to lube these inner crank bearings. You can also see in the second picture where these holes literally drop premix right into the bearings. In the second picture you can see where the seals ride in the case telling us that no premix can get in or out of that center section. This is why guys put the grease zerk in to lube the waterpump shaft. Honestly to me, it makes no sense at all drilling the cylinders to run premix down in this waterpump shaft section. How would the fuel part possibly get burnt? Engine heat evaporation? It sucks that it happened, but let it be a lesson to us guys that run it, to mix stronger than recommended.



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Old 01-26-2010, 09:22 AM
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Originally Posted by AaronBND View Post
They are greasing through the hole in the bottom of the case right under the waterpump gear to lube the waterpump/crank gear teeth. Supposedly the oilite bushing in that BDX oil delete doesn't need oil. Here is a post from another thread:

Researching and putting a lot of thought into doing the BDX oil delete kit myself a few weeks ago, I honestly think you had trouble because we need to mix a stronger premix than BDX recommends. Maybe like 32:1 instead of 40:1. Looking at the pictures below of a M1000 case, you will see that the center section where the waterpump shaft is, is completely sealed off by the inner crank bearing seals. In the second picture, I also marked where the oil ports are on the outside of these seals in the case, to lube these inner crank bearings. You can also see in the second picture where these holes literally drop premix right into the bearings. In the second picture you can see where the seals ride in the case telling us that no premix can get in or out of that center section. This is why guys put the grease zerk in to lube the waterpump shaft. Honestly to me, it makes no sense at all drilling the cylinders to run premix down in this waterpump shaft section. How would the fuel part possibly get burnt? Engine heat evaporation? It sucks that it happened, but let it be a lesson to us guys that run it, to mix stronger than recommended.
The seals are a labrynth seal, they do allow for the trasfer of gas/oil to some degree. If those "seals" were an actual positive seal, then where would the oil thats injected into the cavity under the pump shaft go? The theory, as I see it, behind the milled cavity and the drilled hole is that lubrication will collect in the cavity, and the hole will create a pressure differential between the hole and the labby seal, causing gas/oil mixture to transfer.

There are many sleds out there with the bdx kit and no other modifications, that have many thousands of miles on them. Lube has got to be getting past the labbys, right? When I pulled my case apart, the cavity under the gear was just as clean as the rest of the case, indicating to me that there is some fuel going through there all the time.
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Old 01-26-2010, 02:29 PM
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