Dayco 89378 Belt Tensioner

I ended up using this on my 2012 Toyota tundra 5.7 rock warrior due to belt chirping that has been getting worse over the years. Straightforward fix easily under an hour and fit is exact. I ordered the idler pulley as well just in case, but it seems the belt tensioner was the fix. Just get Days. Don’t mess with any other brands.

Was experiencing some squeaking/chirping coming from front part of engine on 2009 Toyota Land Cruiser. Typically that is the sign of serpentine belt, idler pulley and/or tensioner bearings going out, so I ordered this part, along with the belt and idler to replace my (possibly original) parts. I dropped of parts and car with my mechanic one morning and picked it up later that afternoon. Immediately noticed the noise was gone. Since I didn't do the work myself, I cannot say which part was causing the noise, but I can say that this tensioner, along with the other parts, have been running smooth and quiet since they were put on around 6-8 weeks ago. This SUV has the 5.7L V8, so my guess is that this fits a number of Toyotas and Lexus's with that engine, and whatever else the company says it will fit. I always appreciate it when the person leaving the review mentions what specific make/model car the parts were used on, so I wanted to include mine. Helps when you know for sure, as sometimes despite the product description, it is possible the fit is incorrect. Good part so far! Will update if anything changes, but I don't expect it to.

Few bolds few scratches on hands and done replacement in 2 hrs total. All given with explanation time spent... to my daughter what its doing what its for and her everlasting will to assist and help

fits perfect on 2013 toyota tundra 4.6 liter. very easy installation.

Works as advertised. Dyco exact copy of Toyota OEM.

2016 Tundra 5.7 - Dayco is OEM mfg. (I'll update if/when it starts squealing again) So far so good. My Tundra was squealing especially after the rain. Wasn't sure if it was this or idler pully so I replaced both. I'd recommend doing both and a belt, while your down there anyway. Not an EASY job. May want to watch a few tundra specific YouTube videos before you dig in if you're not a mechanic. I'm not and I did it but it took me some time and a lot of swearing. Male sure you look up the serpentine belt routing I've heard it is possible to get this one wrong. But I'm no mechanic; just cheap and a little bit handy and I did it. Good thing nobody was payinge by the hour though.

I was in a tight spot on 10/5/21 when my Tundra’s alternator died and figured I’d save a few bucks ordering and installing a lower priced Belt Tensioner Pulley along with new Dayco Idler Pulley (p/n: 89502), Bando Belt (8PK2410 OEM Quality Serpentine), and locally rebuilt alternator. I noticed a squeaking sound 6/22/22 and did the water test and verified it wasn’t the belt. I knew the tensioner was bad because when engine was at idle the squeak progressively turned into it COUGAR SHRIEKING OVER ITS KILL and went away when revving the engine because that creates belt tension, eliminating the need for the belt tensioner. I ordered the Dayco 89378 Belt Tensioner and received it 2/4/23. I installed it this morning. Took about 30 minutes. Tested it: No noise whatsoever. Dayco is the Toyota OEM supplier that’s factory spec and labeled just like my original that lasted 109k miles. It has a pin installed to make installation and belt routing easier just like OEM. Tools I used: Belt removal tool 14mm socket 3/8 ratchet 3” extension 12mm socket 6mm Allen key head socket Learn from my mistake. Save a Buck on wipers or windshield fluid. Spend the money on OEM parts and good tires. I have no doubts this will last nearly as long.

Worked fine with 2015 tundra 5.7. Highly suggest replacing original bolts when replacing this. Used old bolts and when torquing down it snapped inside the block..