Mercedes W639 Vito Viano 109/111/113/114/115/116 CDI OM646 Belt Tensioner Pulley Noisy Replace

[@markfitzgerald7556]

Every 50,000 Km I have re greased the bearings (with high temp bearing grease) on the idler and tensioner pulleys without any failures so far on three of my cars. E250 cdi, V250d, and E220d all terrain.

[@ScottElliott152]

The pulleys on my Vito have sealed bearings. Did you prise the rubber seal off them to clean and repack with grease?

[@markfitzgerald7556]

@@ScottElliott152 yes mate I did, I forgot to add that detail

[@ScottElliott152]

@@markfitzgerald7556 That's attention to detailed maintenance! I wanted to just replace the bearing but the bearing is almost moulded into the plastic pulley. There was no way I could press it out without destroying the pulley. My D40 Navara has metal pulleys. I pressed the old bearings out and pressed new ones in.

[@MarkoVukovic0]

Hi Scott. FYI I just did mine and used an offset 17mm ring spanner on the tensioner. Works fine, no need for a special tool.

[@chrisfindlay6419]

Hey Scott, great videos thanks for posting. They save a fair bit of time figuring things out - Whenever I need to do a job you seem to have already done it, though your W639 is a fair bit less rusty than mine! Cheers from the UK.

[@ScottElliott152]

Thanks Chris. My W639 is still going well. I don't plan to sell it. Regards, Scott

[@ricksallotment5923]

Hi Scott, can you remember the torx bit size in pulley? Thanks

[@nyikomahlawole]

Scott is back 🙌🙌🙌🙌🙌🙌🙌🙌🙌

[@ScottElliott152]

Haha ... thanks Eugene. Projects have been thin on the ground because the Vito's been going well.

[@nyikomahlawole]

Happy to see you back in action my Vito has never been healthier ever since I started watching your videos. I’ll be doing my HID conversion soon. Thank you so much for the informative content.

[@ScottElliott152]

@@nyikomahlawole Thanks for the support Eugene. Instead of HID consider LED bulbs. I'm considering converting mine. HID is now old technology compared to the latest LED bulbs. I recently changed out the HID bulbs/ballasts in my Nissan 4wd to LED and they're much better. The light output is about the same or slightly more but the main benefit is light is instant ... no lag waiting for the HID to heat up. I bought a kit from here: www.4wdsupacentre.com.au/

[@nyikomahlawole]

Thank you Scott let me look into it, thank you so much for the advise

[@adambordas5024]

Hi, it's an interesting idea to use a 17mm socket. I have always used a Torx T60 bit on the tensioner. I think I read that in the factory manual. This 17mm looks simpler and as good as the T60.

[@ScottElliott152]

Thanks Adam. I found it's easy to use the 17mm socket especially as you're doing it by feel.

[@DieLechtaler]

Hi Scott, after howmany miles / kilometers you should replace this belt? Also another question, do you have a video about replace the coolant fluid on a W639. Mine got now 300.000KM and need to be replaced. Thx in advance

[@ScottElliott152]

Modern serpentine belts last a long time and manufacturers suggest changing them at about 160,000 kilometres. No I don't have a video on the coolant change but there are videos on YT.

[@kendavies8820]

Hi Scott can you change the belt without removing the front end? Fan assembly etc. Cheers Ken

[@ScottElliott152]

Ken from memory you remove the front lower engine compartment plastic panel and unclip a coolant hose from a bracket. Once you pull back the tensioner and lock it open the belt should come off.

[@johnkaimins9998]

@@ScottElliott152 Hi Scott, just curious about the "lower engine plastic panel" ~ is this a stone tray? If so, I do not seem to have one on my 2004 109CDI. Best regards, John

[@ScottElliott152]

@@johnkaimins9998 it's a typical splash guard. Perhaps the 109CDI doesn't have it.

[@johnkaimins9998]

@@ScottElliott152 Ah, ok thanks. Any chance of a part number?

[@ScottElliott152]

@@johnkaimins9998 I use this online parts finder. partsouq.com/?BRENDOWYE&gclid=Cj0KCQjwt_qgBhDFARIsABcDjOfIVgezUtM7AMH9IsI5NRubYBNLnF5gKd3d0pZ-AfkGhzoGU3RUppEaAroeEALw_wcB

[@pauldragwidge572]

Hello Scott, thanks for your videos. I recently purchased a 2010 viano 7-seater, which needs a few improvements. Have you Amy ideas on improving the ride for rear passenger comfort. The air lift system is very harsh over bumps. Thanks Paul

[@ScottElliott152]

Hi Paul. I'm not familiar with the air system on the Viano. Consider replacement shock absorbers.

[@josuealoui8529]

Gracias 💪💪

[@ScottElliott152]

Thankyou!

[@lambese4-]

I did this job 3 months ago . New belt and tensioner. Everything has been fine but this week it's been squeaking.. I'm wondering if there's any adjustment I can make?

[@ScottElliott152]

It's probably the belt squeaking. The belt tensioner is automatic but perhaps that's on its way out. Try some spray on belt dressing first. If that doesn't sort it out check out the belt tensioner.

[@lambese4-]

@@ScottElliott152 I will give that a shot Thank You!

[@johnkaimins9998]

Hi Scott, thank you for yet another informative video. Quick question ~ what size torx bit is required to undo the pulley?

[@ScottElliott152]

Thanks. Can't recall the torx but it's a standard size found in a typical set.

[@johnkaimins9998]

@@ScottElliott152 Thanks for your fast reply. Also ~ did you buy the aftermarket pulley here in Australia? I can only seem to find one in the UK. 70mm O.D. 17mm I.D. width 28mm

[@ScottElliott152]

@@johnkaimins9998 yes I had to buy from the UK.

[@johnkaimins9998]

@@ScottElliott152 Thank you.

[@geomaj1]

Another grate and helpful video . I'm trying to take out the alternator pulley and change the drive belt with no experience. any tips on how to loosen the pully ? What size soket do I need or do I just unscrew the whole poly with my hands?

[@ScottElliott152]

Thanks. The alternator pulley is an overrun one way pulley. You generally need to remove the alternator and use an impact gun. Not sure what size socket as I've not had to do my alternator pulley.

[@geomaj1]

@@ScottElliott152 just tried to take the pully buy self couldn't do it , so I called my mechanic to help I pulled from the top and he held from the bottom Using the correct tools we Brock the thred and it looked like the alternator pulley can't be taken out it looked like it's one piece with the alternator but I could be wrong. I have to buy a new alternator now any tips on where I can find a resnable priced one. I'm in Melbourne And do you happen to have a diagram of the drive belt I took it off and my diagram doesn't make sense lol.

[@ScottElliott152]

@@geomaj1 Well that's a shame the thread broke. Must have been some corrosion in there. The alternator pulley comes off but you need a special tool and a big impact wrench. There are plenty of YT videos on how to take off those one way or over run pulleys. You need to take the alternator out to unscrew the pulley. The belt alignment diagrams are easily found with a google search.

[@rstiekema]

Hi! Do you know the torque settings for the pulleys?

[@ScottElliott152]

No. I just tightened them by feel. Use this reference chart for the bolt diameter. Most automotive bolts are grade 8.8 or 10.9. It's often stamped on the bolt head.www.grampianfasteners.com/files/95b2c19b-1d29-4624-abdf-0813df2db3ac/Torque_Settings.pdf

[@johnkaimins9998]

Hi Scott ~ hope you are enjoying a nice break over Easter. Quick question ~ how many idler pulley's does an OM 646 engine have? I am about to replace the idler tensioner pulley.

[@ScottElliott152]

Two idlers.

[@johnkaimins9998]

@@ScottElliott152 Thank you

[@johnkaimins9998]

@@ScottElliott152 Would you have any idea where I can find a diagram of the pulley set up? ~ I figure if I am replacing the tensioner pulley, I might as well replace all the idler pulleys as preventative maintenance.

[@ScottElliott152]

@@johnkaimins9998 sign up to www.benzworld.org as that site has a lot of information. I use this online parts finder. It has schematics and the OEM numbers: partsouq.com/

[@johnkaimins9998]

@@ScottElliott152 Thank you Scott. Much appreciated.

[@TheZuosamson]

Hi Scott, what's the difference between a 722.682 and a 722.686 transaction? Are they having same core component but a different bell house? Thanks

[@ScottElliott152]

Hi Samson: sportlichleicht.com/info/transmissions/722_6 The torque ratings are the same. It maybe different internal gear ratios but I don't know for sure. My 115CDI has the 722.682.

[@petrturcovsky7035]

Hi Scot, are you happy with the DTUK, did you get it from UK? Worth it? THanks

[@ScottElliott152]

Yes happy with it. It hasn't missed a beat in the 7 years since I bought it. I bought it direct from DTUK in the UK.

[@jamiesbestedits5646]

can I use these h7 led globes for my headlights as well

[@ScottElliott152]

Yes because fog lights and headlights use standard H7 bulbs

[@jamiesbestedits5646]

@Scott Elliott Thanks alot I've had my 07 vito for around 8 years now I do everything on the van myself Thanks to your videos your a genius Thanks Fab