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Discussion Starter · #1 ·
Modified my Gen1 xB’s serpentine belt tensioner by combining it with a 2013 Scion xD tensioner. This mod can be made without removing the xB's, as no alteration is needed to it. I took it off for taking pictures. The xD's is comprised of three Scion parts and one additional bolt.

16385-37010 - Belt Adjusting Slider - $2.66
90105-08433 - Flange Bolt - $1.46
16381-37010 - Belt Adjusting Bar - $12.19
Metric bolt with serrated flange, full thread, 8M x 1.25 x 20mm - $1.08
Total - $17.39

Tools used were a hacksaw, a flat peen hammer, and a drill with a 5/16th bit. Total time was about forty minutes.
Trigger Gun accessory Nickel Auto part Bicycle part

Bolted the two bars together to make guide marks. A forty-degree diagonal line was drawn where the xB bar traversed the xD bar. A pilot mark was made on the xD bar using a center punch through the xB’s threaded nut.
Automotive lighting Font Material property Automotive exterior Auto part

A ½” long line was drawn at the top lip of the xD bar approximately one inch from the left end. Used a hacksaw to cut off the xD’s threaded nut segment and to cut the half inch line.
Bicycle part Font Automotive exterior Metal Auto part

The 1" long section was flattened to provide more contact area where a bolt fastens the two adjuster bars. A 5/16th inch hole was drilled where the pilot mark was on the xD bar.
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Used an 8Mx1.25x20mm full thread serrated flange bolt to fasten the xD bar to the xB bar.
Gun accessory Trigger Composite material Household hardware Metal

The xD bar adds about ¼ inch thickness so I replaced the alternator’s top bolt with an 8Mx1.25x30mm full thread serrated flange bolt. This longer bolt uses all the alternator’s housing threads. Tension for the serpentine belt is set by loosening the two alternator bolts, positioning the long adjuster bolt, and tightening the two bolts.
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This is to have tensioning bolt to precisely and nicely set belt tension instead of prying on alternator with something long to get belt tight all unpreciselike right?
 

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xB Leaving Pit Soon
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Discussion Starter · #3 ·
Yes sir. Makes it easy to adjust and to lock in when the deflection gauge shows within tension range. Scion specifies the Gen 1 xB range as 121 LBF to 143 LBF when installing and adjusting a new belt; and 55 LBF to 88 LBF when adjusting an used belt. Parts places often have that gauge in their loaner program.

wagonbldr also made a great tensioner for the Gen 1; check his posting in DIY.
 

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Modified my Gen1 xB’s serpentine belt tensioner by combining it with a 2013 Scion xD tensioner. This mod can be made without removing the xB's, as no alteration is needed to it. I took it off for taking pictures. The xD's is comprised of three Scion parts and one additional bolt.

16385-37010 - Belt Adjusting Slider - $2.66
90105-08433 - Flange Bolt - $1.46
16381-37010 - Belt Adjusting Bar - $12.19
Metric bolt with serrated flange, full thread, 8M x 1.25 x 20mm - $1.08
Total - $17.39

Tools used were a hacksaw, a flat peen hammer, and a drill with a 5/16th bit. Total time was about forty minutes.
View attachment 79388
Bolted the two bars together to make guide marks. A forty-degree diagonal line was drawn where the xB bar traversed the xD bar. A pilot mark was made on the xD bar using a center punch through the xB’s threaded nut.
View attachment 79389
A ½” long line was drawn at the top lip of the xD bar approximately one inch from the left end. Used a hacksaw to cut off the xD’s threaded nut segment and to cut the half inch line.
View attachment 79390
The 1" long section was flattened to provide more contact area where a bolt fastens the two adjuster bars. A 5/16th inch hole was drilled where the pilot mark was on the xD bar.
View attachment 79391
Used an 8Mx1.25x20mm full thread serrated flange bolt to fasten the xD bar to the xB bar.
View attachment 79392
The xD bar adds about ¼ inch thickness so I replaced the alternator’s top bolt with an 8Mx1.25x30mm full thread serrated flange bolt. This longer bolt uses all the alternator’s housing threads. Tension for the serpentine belt is set by loosening the two alternator bolts, positioning the long adjuster bolt, and tightening the two bolts.
View attachment 79393
Great job on building the adjuster AND presenting here so clearly. I am definitely going to build one for my '06. Thank you for sharing!
 

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$14 for one and $15 for the other off ebay with free shipping. Just searched Goodyear and those part numbers but the ones I scored said last one from that seller. Not sure what other listings' prices were tho................
 

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The gates micro-v ones are decent priced and my usual go to. Gates also has higher priced heavy duty racing ones too about $50 each. The goodyear seemed to be performance features at base price according to descriptions so am giving them a go. Never had issue with gates base ones tho. Either will be better than whatever has been on there for the last 2 years since I bought it and who knows how long before that.
 

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Discussion Starter · #13 ·
I am excited, this looks like something that would be great to do. Thanks for sharing!
For another consideration, in the DIY section, check out the tensioner made by wagonbldr. His posting is titled DIY, 1st Gen Belt Tensioner. He constructed a unique turnbuckle adjuster for the Gen1 xB. For either design you may choose to use, please post some pictures of your mod.
 

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A little late on the other option, went with your mod. Have had all the parts for tensioner and the new Goodyear belts for a week or so. Even just sprung for the oem xB bracket so I could build tensioner without taking the box apart. Today is tensioner build and belt swap/tensioner install on Tuesday when I have some days off. So here's a few pics of the results......

Tool Nickel Toy airplane Auto part Revolver


First of all, that part you just hack saw off was a breeze,lol.....no arm pump or shoulder damage or cramps at all. Took it off in one pass without stopping like I used a lasar.....NOT.....took about 4 attacks and a coffee break.

Used my vice to hold tab and a 15" crescent wrench to bend it instead of hammering the tab flat. The vice jaw left some texture for character...
Product Newspaper Bicycle part Nickel Auto part


As far as bolts looking a bit long, I did some measuring and the long one thru alternator will only stick out about 3mm past alternator lug. The shorter one will have a ground wire mounted on front of it so it will end up just right....

Air gun Trigger Gun barrel Automotive exterior Gun accessory


Bolts were on hand from the oem toyota metric magic tub of nuts, bolts and fasteners gathered over the decades from all the modding, salvaging, scrounging during junkyard trips and leftovers from whatever. It always has what I need.

Will take more pics during install........................
 

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Looked at the other DIY and it is aesthetically nicer but long term wondering about heim joint slop developing and also there was no link to get the threaded hex shaft middle part in the post with the links to ends and jam nuts. Was unable to find threaded hex shaft on that site either. Looks cool but just gonna stay with this mod.
 

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The center hex shaft is custom made. So far they are holding up well. Myopic and I came up with these mods around the same time. I'm just glad we were able to provide options for something that was needed. A third option is installing a bolt as a pry point. Also in the DIY section.
 
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Guessing hex shaft had to be drilled then tapped halfway with both left and right hand 5/16-24 threads....I have no drill press for that type of drilling. Probably could manage the tapping.
 
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