Bearings replaced for serp. tensioner and idler pulleys. Part numbers.
08-17-16, 11:27 AM
#64
The local shop doesn't have a cross reference for the NSK BD20-15DUL. I called Motion Industries which is a dealer for NSK and he doesn't have that bearing or a cross reference for that double row bearing. 
The idler on my '97 doesn't have a bushing that has to be used with the 6301 bearing. The bearing itself is all the needs to be pressed in.
additional
We aren't the only ones with this issue:
http://www.shoforum.com/index.php?th...question.6471/
I'm glad I kept the old one that uses the 6301, seems that finding that NSK makes the pulley almost propriety that requires full replacement.
When I think about this more, going to a pull a part yard to find the idlers with the 6301 may be an easy alternate in place of these NSK installed variants.
The idler on my '97 doesn't have a bushing that has to be used with the 6301 bearing. The bearing itself is all the needs to be pressed in.
additional
We aren't the only ones with this issue:
http://www.shoforum.com/index.php?th...question.6471/
I'm glad I kept the old one that uses the 6301, seems that finding that NSK makes the pulley almost propriety that requires full replacement.
When I think about this more, going to a pull a part yard to find the idlers with the 6301 may be an easy alternate in place of these NSK installed variants.
Last edited by RA40; 08-17-16 at 11:43 AM. Reason: additional
08-17-16, 03:00 PM
#66
This gates puuley seems to have the same bearing though you would need to see the back to confirm.
https://www.amazon.com/Gates-36026-D.../dp/B000IY7RGI
https://www.amazon.com/Gates-36026-D.../dp/B000IY7RGI
08-17-16, 04:51 PM
#67
Looking through catalogs for the NSK BD20-15DUL
One sales rep mentioned this one:
NSK BD20-15 T12 DD
SKF 62301-2RS1
Radial/Deep Groove Ball Bearing-Metric - 12 mm ID, 37 mm OD, 17 mm Width, C0, Double Seal
This NSK has been looked for on multiple forums without success. The less expensive route is to get one of the superseded parts from Toyota or aftermarket suppliers. I'd used the 6301 specs looking for double row in the 15-17mm thickness and the results are far few other than the SKF that was in the Motion Industries catalog. Whether that 2mm is significant can't say. If the 6301 fits going single row is the option. As far as what was in ours, I replaced the idler in ours the other day because it began squeaking so the 6301 pulley is back in there. Both these top idlers gave up in the 90-100K range. Based on this, the double row gave similar longevity to the single row. The single row bearing is far less $ and readily available.
The 6301 based pulley my be an alternate experiment for the 3UZ/ LS430's.
One sales rep mentioned this one:
NSK BD20-15 T12 DD
SKF 62301-2RS1
Radial/Deep Groove Ball Bearing-Metric - 12 mm ID, 37 mm OD, 17 mm Width, C0, Double Seal
This NSK has been looked for on multiple forums without success. The less expensive route is to get one of the superseded parts from Toyota or aftermarket suppliers. I'd used the 6301 specs looking for double row in the 15-17mm thickness and the results are far few other than the SKF that was in the Motion Industries catalog. Whether that 2mm is significant can't say. If the 6301 fits going single row is the option. As far as what was in ours, I replaced the idler in ours the other day because it began squeaking so the 6301 pulley is back in there. Both these top idlers gave up in the 90-100K range. Based on this, the double row gave similar longevity to the single row. The single row bearing is far less $ and readily available.
The 6301 based pulley my be an alternate experiment for the 3UZ/ LS430's.
Last edited by RA40; 08-17-16 at 04:53 PM. Reason: spacing
08-17-16, 06:01 PM
#68
Pole Position
This gates puuley seems to have the same bearing though you would need to see the back to confirm.
https://www.amazon.com/Gates-36026-D.../dp/B000IY7RGI
https://www.amazon.com/Gates-36026-D.../dp/B000IY7RGI
08-17-16, 06:21 PM
#69
Pole Position
I see #6203-2RS bearings in Dayco OE replacement tensioner pulleys in online photos, but that bearing is a 17 mm I.D.
Edit: Also seeing #6203LUA (NTN-brand) bearings in OE replacement tensioner pulleys. As noted, the NTN #6203LU was the OEM bearing in my '01 tensioner pulley.
Edit: Also seeing #6203LUA (NTN-brand) bearings in OE replacement tensioner pulleys. As noted, the NTN #6203LU was the OEM bearing in my '01 tensioner pulley.
Last edited by Tom57; 08-17-16 at 06:31 PM.
08-20-16, 10:56 AM
#70
08-20-16, 01:20 PM
#71
Pole Position
Too funny, sha4000. I literally just received delivery of the Dayco idler pulley (Dayco #89154) and I'm about to install it! The bearing is a 6203RS and has a bushing on each side. This is different than the OE pulley which had no bushings, just the core bearing center. Pics to follow.
Last edited by Tom57; 08-20-16 at 01:50 PM.
08-20-16, 03:00 PM
#72
Pole Position
The Dayco #89154 OE replacement idler pulley (bearing 6203RS) installed very easily. However, a couple things to note:
(1) The replacement Dayco pulley has 2 bushings on each side of the bearing; the original idler pulley appears to have one continuous center axle of the bearing. I'll verify when I punch out that bearing for further examination. I'm beginning to suspect, however, that the original bearing has a 12 mm I.D., whereas the replacement bearing is a 17 mm I.D. bearing with 2 reducer flange bushings inserted, making the final I.D. with bushings also 12 mm. (See pics.)
(2) The replacement Dayco pulley has a slightly different contoured face than the original pulley. (See pics.) The Dayco instructions state that the bearing is "permanently sealed" so the "dust cover is not needed." It says "always check the dust cover for interference before installing. If you have interference, discard the dust cover and continue with installation." Don't confuse the original pulley plate as a "dust cover." Since the replacement bearing has larger face bushings than the original bearing without bushings, there may be a temptation to install the replacement pulley without the face plate. However, the face plate provides additional support on the front side of the pulley for the partial-shoulder bolt that attaches the pulley to the engine bracket.
Edit: More research > the 6203RS (or 2RS) bearing is 17 mm I.D. The 6301 is 12 mm I.D.
The difficulty getting that bearing out will be: I don't have a press, and one side of the bearing is partially covered by the pulley (see pic #3), so the bearing can only be hammered out one way but without the outer rim of the bearing exposed for access to set a socket on, and hammer it.
(1) The replacement Dayco pulley has 2 bushings on each side of the bearing; the original idler pulley appears to have one continuous center axle of the bearing. I'll verify when I punch out that bearing for further examination. I'm beginning to suspect, however, that the original bearing has a 12 mm I.D., whereas the replacement bearing is a 17 mm I.D. bearing with 2 reducer flange bushings inserted, making the final I.D. with bushings also 12 mm. (See pics.)
(2) The replacement Dayco pulley has a slightly different contoured face than the original pulley. (See pics.) The Dayco instructions state that the bearing is "permanently sealed" so the "dust cover is not needed." It says "always check the dust cover for interference before installing. If you have interference, discard the dust cover and continue with installation." Don't confuse the original pulley plate as a "dust cover." Since the replacement bearing has larger face bushings than the original bearing without bushings, there may be a temptation to install the replacement pulley without the face plate. However, the face plate provides additional support on the front side of the pulley for the partial-shoulder bolt that attaches the pulley to the engine bracket.
Edit: More research > the 6203RS (or 2RS) bearing is 17 mm I.D. The 6301 is 12 mm I.D.
The difficulty getting that bearing out will be: I don't have a press, and one side of the bearing is partially covered by the pulley (see pic #3), so the bearing can only be hammered out one way but without the outer rim of the bearing exposed for access to set a socket on, and hammer it.
Last edited by Tom57; 08-22-16 at 03:17 PM.
08-20-16, 04:20 PM
#73
Pole Position
Bearing removed from '01 - OE idler pulley. (PB Blaster works well.) I was hoping to find other descriptive info on the reverse side of the outer portion of the bearing - the part that is covered by the back side of the pulley - shows the same: NSK brand - Japan - #BD20-15DUL. This bearing number is either: (1) proprietary to Lexus/Toyota, or (2) it's a Japanese domestic market only ("JDM") bearing number.
The original bearing I.D. is 12 mm. (For its size, it's a pretty heavy bearing.) If we could find a cross-reference part number of equal high-quality manufacture, these pulleys could be so easily repaired for just a few dollars.
The original bearing I.D. is 12 mm. (For its size, it's a pretty heavy bearing.) If we could find a cross-reference part number of equal high-quality manufacture, these pulleys could be so easily repaired for just a few dollars.
08-20-16, 05:17 PM
#75
Pole Position
The Dayco is listed as the OE replacement brand pulley. (See posts 54 & 68.) Don't worry, your Gates pulley is a great brand name and your bearing appears to be Japanese-made which are typically OE equivalent high-quality too.
Last edited by Tom57; 08-20-16 at 05:42 PM.