Does anyone know where I can get a rebuild kit for my supercharger or a place that will do the rebuild for me for a decent price? I am not sure if it is the bearings or the coupler in the front. It is making a knocking sound, I haven't taken it out yet but I opened it up and I am sure it is the supercharger.

 

if it knocks coming off throttle then it's more than likely a worn coupler, there are plenty of places in the US for this refurb and parts are easy to get too compared to the UK, it's a bugger on both fronts, work and parts.

 

I had it on the highway no knock, then I got off hit a red light and it started knocking. I opened up the top plate and pushed the 2 propeller roots and it is making the knocking sound when I pushed them a little. At idle it knocks then higher RPM goes away. So that would be the coupler that's what you think?

 

What you describe sounds like rotor bearings, likely the rear ones. At idle take a stethoscope or a piece of rubber tubing and move it against the supercharger from the snout all the way back. You will isolate where the knocking is. As Sean mentioned there are several companies that rebuild this supercharger. If you have a press you can replace the rear bearings, snout bearings, coupler, and oil yourself. The front rotor bearings are way more difficult and best left for the pros.


I rebuilt mine and bought the snout re-build kit and rear bearings from John Bond Performance. It was harder to remove the supercharger than to rebuild it. Change the water hoses that run under the supercharger while it is out. Excellent advise found on this forum is to notch the rear bolt hole on the supercharger to ease re-assembly.

 

Do you need any other special tools to take the bearings out and back in. I watched Jon Bond video of how to rebuild a supercharger, he was saying something about special tools required. Just wondering if you had to use any special tools. I really appreciate the advice about replacing the hoses underneath. Thank you very much will let everyone know how I make out.

 

Jon bond's video shows an Eaton model where the rear bearings have to be pulled out from the inside requiring special tools. Our version of the supercharger uses bearings that go thru the case and are easy to replace. You will need a press to rebuild the snout but no other special tools are needed.


You can see the difference in this photo

 

Thank you for that pic I can see the difference now. I guess I better start the tear down. Maybe I will post some pics to help others out in the future. Again I really appreciate all the advice you all have given me, if there is anything else I would love to hear it. Maybe change the knock sensor too while everything is out of the way.

 

You could make the switch to the Generation 5 Eaton off of the X350 generation XJR. The X308 has the GenIII M112 Eaton. The GenV got much larger rotor bearings and an improved coupler, as well as slightly better port shapes. I did it on my 2000 XJR, and boost seems to fall off less at the top end and it's nice to have the extra reliability. I paid $600 for my VERY low mile X350 blower, and the only things I had to change to run it were I had to use an X350 inlet manifold gasket and cut two shallow pockets in the inlet manifold to clear the larger bearings and shaft ends. IMO it's definitely the way to go, slightly increased performance and just a better design, so you don't have to worry about your replaced coupler and bearings in the Gen III failing after another 50k miles.

Oh and while you're in there, replace the heater hoses that run under the blower. They WILL eventually fail and they aren't expensive, so while you have all the hard work of pulling the blower done, go ahead and replace them.

 

That's interesting now would the stock x308 intercoolers fit on the Gen V supercharger or do you need the x350 ones. Are they the same size where the intercooler plate sits and ducts? Or do you have to switch it all.

 

Nope, the overall unit mounting is identical as is the outlet manifold mounting. The X350 does use a very different outlet manifold and IC setup, but the port and flange are identical, so all the X308 stuff bolts right on just like it does on the Gen III unit. The only minor problems with using my X308 parts with the X350 supercharger were the pockets I had to machine in the X308 inlet manifold and that the inlet port is very slightly higher on the X350 blower, so the two little coupler tubes between the inlet manifold and the blow off valve were somewhat compressed which made it a real pain to get the inlet manifold bolts started, but other than that it's very easy.

 

I found a gen 5 for a little cheaper than a gen 4. So I would just have to machine the inlet manifold where it meets up with the inlet port on the supercharger, then everything else will work. That's what you are saying right, just wanted to make sure I know what needs to be done if I go that route.

 

Yep, I just marked the spots with the gasket and hogged it out with a Dremel, to a depth of about 1/8". If I had it to do over again I'd have just taken it down to the local machine shop and had them do it, but the Dremel worked just fine. I'll see if I can dig up the picture I took of it.

 

That pic would be nice. Hope to start the dismantling this weekend the Gen 5 was a little cheaper then a used gen 4 or maybe the same price as a rebuild, since I do not have a press. I might go Gen 5. I would have to use a dremel also, so this really helps.

 

I just recorded this video of my XJR. It sounds like the noise is coming from the rear of the supercharger, I am thinking rear bearings. Maybe some of you guys can listen and tell me if you think it is coming from the rear and if it is rebuildable or am I better off buying a used one. I know you would need to see the inside but I am just asking for some opinions on which way you would go. Thanks.

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