nosecone issues [m62] - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Forced Induction All questions and problems regarding Superchargers, Turbos, NOS, ZEX, intercoolers, water injection, etc.

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Old 12-27-2007, 02:56 PM   #11
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got a 94/94 style w/ throttle body coming for $55 to the door. we will see the shape when it arrives within the next few days.
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Old 12-27-2007, 03:17 PM   #12
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Great price. That'* a good spare supercharger for your 95 as well. I typically pay 100 plus about 30 shipping (the three I've bought via ebay)

Based on the condition of the rotors in both blowers, you may want to rebuild the one coming rather than the one you have.
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Old 12-27-2007, 11:04 PM   #13
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charger housing from m62 with nosecone issue. this wear pattern normal or abnormal?





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Old 01-05-2008, 11:25 PM   #14
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Don't buy from that Craigslist guy! Those are my pictures, from a gen2 charger I sold on eBay several weeks back. I don't know how he thinks he has the right to copy them and use in his listing. I can't believe it. Plus, who knows what his supercharger actually looks like if he'* using pictures of mine?

I just sent Craigslist an email requesting the listing, or at least my pictures, be removed.

My original listing is here:

http://cgi.ebay.ca/ws/eBayISAPI.dll?...MESO:IT&ih=004
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Old 02-17-2008, 12:13 AM   #15
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Chris C, your problem may not be the nose drive. Where did you get your bearings from?

Recently I bought a bunch of rebuild parts from Chris Britton (Rolling Performance) and I'm having problems with them as well. The smaller (inner) nose bearings, for one. I've got 3 of these bearings from him right now and two used, factory bearings. The Rolling Performance NTN bearings' outside diameter, on average, measures about .010" smaller than the stock bearings, which you have to remember are used and have already been pressed in and out once. When you consider that these nose drives don't rely on very tight interference fits, that'* a huge difference. I'm about to email Chris about these issues. I've got 3 nose drives here right now and Chris' bearings drop right in (no press fit) to all 3. The problem isn't the nose drive. The inner bearing isn't meant to be a super-tight fit, that'* why the spring is there to keep the shaft engaged tightly with the coupler, but they shouldn't be this loose. I can move the bearings radially in the nose drive.

It'* worth mentioning that I've used Chris' bearings in several rebuilds that were OK. It'* possible there is a lot of size variation from bearing to bearing. NTN bearings are made in Taiwan, so quality control may be the issue. I've run some part numbers on these bearings and found that the snout bearings he sells are actually common power steering pump bearings. I'm wondering if Chris just measured the stock bearings and matched something up, or if he actually knows the part numbers and brand of the stock bearings and actually cross-referenced them. My bearing book at work says these particular NTN bearings aren't rated for the RPM the supercharger is seeing. I have to talk to Chris about this; there may be an error there, but it'* cause for concern. I have ordered the SKF variants of Chris' bearings through my shop to see if they are a better fit. If they don't fit either, I'll know for sure that Chris is using the wrong part numbers. The parts guys at my shop are also working on finding a better replacement for the stock bearings as welll and they should have something in a day or two.

I'll post more as I learn it; I'm working hard to figure this thing out.
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Old 02-17-2008, 12:34 AM   #16
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There isn't a member of this forum that should even think about attempting to replace the bearings behind the gears (intermediate bearings). They rarely go bad, and we don't have a factory jig to realign the rotors and gears.

If they go bad, or you suspect them, have it rebuilt by a pro with a jig, or replace the rotor assembly.
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Old 02-17-2008, 01:24 AM   #17
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Willwren, we're talking about the nose drive bearings here, the inner (small) one more specifically.

For what it'* worth, I replace the rotor plate bearings and seals. I had a few sets of rotors bind on me starting off, but caught this right away, and now I nail it every time. It'* taken practice and much improvement to my homemade special tools, but it'* do-able if you're committed. I do this (working on cars) for a living though.
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Old 02-17-2008, 12:04 PM   #18
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I'm not aware of anyone having issues with nosedrive bearings on this Forum in 6 years and 10,000 members UNLESS the nosedrive itself was worn to begin with. I've lost count of my rebuilds for myself and others, and have never had an issue.
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Old 02-18-2008, 12:04 PM   #19
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You're missing my point. There IS an issue when the replacement bearings measure smaller in diameter than the old ones. That means they're not a proper replacement bearings, for one thing. I've got 3 nose drives here and on all 3, the old bearing is a good fit, and all 3 of my Rolling Performance bearings, on all 3 nose drives, aren't. I think that sort of rules out the nose drive being "worn". How would it wear there, anyway? There'* nothing coming into contact with the inner bores. The bearings are pressed in there, rotating in their races; that'* it. It can't wear.

Give me a couple days to figure out if this is a) a bad set of bearings, which is possible since I've discovered you can get these NTN bearings for about $3 each all over the internet, or b) not the right part number for our superchargers to start with.

As mentioned, I've got my parts guys working on this. They ordered the same part # of bearing in two other brands so we can compare sizes. If the NTN ones are smaller than the other 2 brands, then we know the problem is the NTN brand. If all 3 brands are smaller than stock, then we know that this is the wrong part # Chris is selling, and I can look at finding the right one. Give me some time, I'm working on answers here.
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Old 02-18-2008, 12:07 PM   #20
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When the bearings wear, it can cause an off-axis wobble in the input shaft, which applies force to the outer diameter of the outer race, hogging out the aluminum of the nosedrive.

We've had a couple here do that over the last 5 or 6 years. I know at least one of them is posted.
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