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#1
08-28-2023, 02:09 PM
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Smog Pump Bearing
I am restoring the AIR pump for my 1970 L78 Camaro and would like to replace the rear roller bearing, but cannot clearly ID the existing bearing to find a replacement. Very difficult to read clearly due to corrosion, but it appears to be an NDH bearing with possibly PN 3248-G??? Does anyone have a cross to this bearing?
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Steve Nuwer 1970 Z28, Norwood 03A, 48 48, 723 Int, M20, COO, 2021 Legends Platinum restored 1970 L78, Norwood 04C, 17 17, 711 Int, M21, COO, born-with drivetrain project. 1972 Z28, Norwood 11C project, born-with drivetrain, 26 26, 775, M20, CGG project 1970 Z28, Norwood 05C, 48 G, 720 Int, M21, COZ, Original Unrestored (SOLD) www.2ndGenZ.com 
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#2
08-28-2023, 04:21 PM
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maybe this will help:
https://bearingfinder.ntnamericas.co...oller-bearings
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70Z28 04B Norwood Forest Green-white Stripes Black DeLuxe Interior Owned since 1978 - First Car
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#3
08-28-2023, 05:02 PM
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Bearing Service Co. a local bearing suppler, has bearings for '67 smog pumps in stock. Guessing you would have a similar bearing suppler to compare yours - Bill W
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#5
08-28-2023, 11:24 PM
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Thanks guys!...excellent leads and I'll start following up!
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Steve Nuwer 1970 Z28, Norwood 03A, 48 48, 723 Int, M20, COO, 2021 Legends Platinum restored 1970 L78, Norwood 04C, 17 17, 711 Int, M21, COO, born-with drivetrain project. 1972 Z28, Norwood 11C project, born-with drivetrain, 26 26, 775, M20, CGG project 1970 Z28, Norwood 05C, 48 G, 720 Int, M21, COZ, Original Unrestored (SOLD) www.2ndGenZ.com
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#6
08-29-2023, 05:12 AM
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Link
https://www.camaros.net/threads/1969...337897/page-31 Lifted from Lloyds Build. There are 2 bearings in the smog pump, a needle bearing, style B248 1 1/2" ID x 1 7/8" OD x 1/2" width that is pressed into the access hole in the internal drum and another at the top (pulley end) of the main case, a sealed 6203LLBC3/EM radial ball bearing, 17 mm bore ID, 40 mm OD, 12 mm width.
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69 Los Z11 68 SS/RS 396/325 68 Los Z28 
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#7
08-29-2023, 11:44 AM
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If you get stuck, let me know. I have a client that rebuilt many many smog pumps through the 70, 80's and I'm sure he could track that bearing down (or one that will work correctly)
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70 L78 Nova Fathom Blue,Bench, 4spd, F41, 3:55 71 Porsche 911 Targa
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#8
08-29-2023, 11:52 AM
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Found this Torrington on a search...
https://nationalswitchgear.com/Produ...__010-124.aspx
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Mitch 1970 Chevelle SS 1966 Chevelle SS 1967 Camaro ss/rs 1938 Business coupe, street rod 2000 FXSTS, original owner, 13k miles
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#9
08-29-2023, 05:26 PM
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Thanks again guys...the members on this site are awesome. Found a suitable rear bearing and should be here in a few days. I've de-vaned 2 or 3 of these pumps in the past, always replaced the front sealed bearing, but was always able to clean and re-use the large rear bearing...not so with my L78 pump, so this is new territory.
BTW, regardless of mfgr, the B248 style bearing is only rated for 4300 rpm if grease is used as the lubricant...seems kinda low but then again, I haven't compared the pump pulley to the crank pulley...yet. Thanks again!
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Steve Nuwer 1970 Z28, Norwood 03A, 48 48, 723 Int, M20, COO, 2021 Legends Platinum restored 1970 L78, Norwood 04C, 17 17, 711 Int, M21, COO, born-with drivetrain project. 1972 Z28, Norwood 11C project, born-with drivetrain, 26 26, 775, M20, CGG project 1970 Z28, Norwood 05C, 48 G, 720 Int, M21, COZ, Original Unrestored (SOLD) www.2ndGenZ.com
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Linear Mode
