[DeTomaso] Steering Rack Bearings - 1622 ZZ are not the right ones!!

[John Taphorn]

Hi Richard

Good info.  The rack is in place and ready for testing when the car gets 
under power in a couple months.

Since the pinion's shaft clearance, in and out, is contained by spacers in 
the rack's housing, I would think the axial loading minimal.  Although, 
perhaps I misunderstand the application of "axial" in this application.

Regardless, we will report back any problems.  Initially, there is no 
binding when turning the pinion shaft in either direction.  It appears to be 
a very happy camper.

I suppose if the exercise requires another $8 in bearings after 10 years, 
that will not be so bad.  I'll add that if I faced the same issue today, I 
would go with those bearings happily with naive confidence.

JT
----- Original Message ----- 
From: "Richard Barkley" <rlbpantera at earthlink.net>
To: <rgg at gregorycook.com>; "Detomaso List" <DeTomaso at realbig.com>
Sent: Sunday, August 29, 2010 6:59 PM
Subject: [DeTomaso] Steering Rack Bearings - 1622 ZZ are not the right 
ones!!


>  Rob,
>
> I'm afraid to say but you don't have the right kind of bearing for this
> application. I went through this about 10 years ago. The problem is that
> the rack and pinion gears are cut at about a 45 deg angle which means
> there will be an axial load on the bearings about equal to the load on
> the rack. Regular ball bearings are meant for primarily radial loads and
> can fail quickly with axial loads although, due to the low rotation
> rates that may not be the case here. The original bearings have the
> balls contacted at a 45 deg angle. Here's a link to pictures and
> diagrams on my website.
>
> http://home.earthlink.net/~rlbpantera/rack/index.html
>
> Here's the discussion that went on in 2000:
> http://realbig.com/detomaso/2000-03/814.html
> hit the < or > arrows to move through the discussion. Fortunately nobody
> at that time suggested that I use a regular BB as a replacement.
>
> At the time Larry Stock had some of the bearings and I bought a pair
> from him. The bearings you have now may work for a while (maybe quite a
> while?) but should eventually fail. A better alternative, if the correct
> ones can't be found, would be a deep grove bearing (the 1622 ZZ don't
> appear to be that) which are better at handling axial loads.
>
> Richard
>
> robert stewart Wrote:
> A few weeks back John Taphorn and I removed the steering rack from my
> car hoping
> for a relatively quick exercise of cleaning to up, painting adding the
> zerk and
> lube. When we took the rack apart we found that top bearings that sit in
> an open
> race where in many pieces.
>
> After a quick consultation with Mike Drew there didn't appear to be a
> well know
> replacement for the bearing.
>
> John suggested I visit a good friend of Gray Gregory - Lars Nielsen at
> Motion
> Industries in Houston. To say Lars was helpful would have been a huge
> understatement. He took the rack measured the bits and pieces of the
> bearing and
> race and identified a replacement suggesting a fully enclosed bearing
> instead of
> the open one. In addition he took the rack into the backroom and worked
> with one
> of his shop guys to remove the other bearing and race.  It was quite a
> pain to
> get out. Heck he even used a parts washer to clean up the rack. Can you 
> say
> "above and beyond".
>
> The two bearings which are part number 1622 ZZ cost me about $4 each and
> are
> fantastic. The rack turns very easily  and even though the bearings are
> sealed
> the lubricate that we put in through the zerk is still able to move
> throughout
> the rack as intended.
>
> Thanks to Gray, Lars and John.
>
> Rob
>
> -- 
> -----
> Sincerely, Richard Barkley
>
> To Ski or not to Ski, that is the question!
>
> Richard Barkley (310) 373-6695 (home)
> E-mail:  rlbpantera<atsign>  earthlink.net
> ZONKEY'S home page: http://home.earthlink.net/~rlbpantera
> Mammoth Lakes Vacation Condo: 2BR+loft/3Bath - Horizons 4 #186 (760) 
> 934-6758
> Condo web address: http://home.earthlink.net/~rbarkley
>
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