+- STD (https://www.superturbodiesel.com/std)
+-- Forum: Tuning (https://www.superturbodiesel.com/std/forumdisplay.php?fid=6)
+--- Forum: Engine (https://www.superturbodiesel.com/std/forumdisplay.php?fid=7)
+--- Thread: OM605 belt tensioner rattle (/showthread.php?tid=7236)
OM605 belt tensioner rattle - Petar - 05-29-2016
On my OM605 the tensioner makes noise at something like 1000 rpm. It's quite a rattle. The tensioner pulley seems to flop around when it makes noise. I've unscrewed the top shock mounting bolt and the rubber spacer behind the upper shock mount was completely. So i've made my own, by cutting open and drilling through a piece of fuel hose
. The rattle is reduced but it's still there.I think the upper mount has too much play and that it is the problem. The shock is hard to extend and extremely hard to compress by hand, so i think it's working properly. The shock gets quite hot after a while 
Is there supposed to be a bushing at the upper shock mount. The bolt seems to be quite loose in the hole, dunno if normal ??
RE: OM605 belt tensioner rattle - barrote - 05-29-2016
Hy Petar,
usually the rattle is caused by the arm hinge, weather u replace it by a MB spare or u go in a machine shop as ask them to make a bushing , it must be very tight. engine vibrations usually drive the bolt in the tight sense, so play is something odd.
RE: OM605 belt tensioner rattle - AlanMcR - 05-29-2016
Does the alternator have a functioning one-way clutch?
RE: OM605 belt tensioner rattle - Petar - 05-30-2016
(05-29-2016, 04:45 PM)barrote Hy Petar,This arm hinge you mean number 17 in this picture ??
usually the rattle is caused by the arm hinge, weather u replace it by a MB spare or u go in a machine shop as ask them to make a bushing , it must be very tight. engine vibrations usually drive the bolt in the tight sense, so play is something odd.
![[Image: 94969d1313834852-how-do-i-adjust-belt-te...-lever.jpg]](http://www.peachparts.com/shopforum/attachments/diesel-discussion/94969d1313834852-how-do-i-adjust-belt-tensioner-om606-om606_-serpent-belt-tensioner-lever.jpg)
(05-29-2016, 10:37 PM)AlanMcR Does the alternator have a functioning one-way clutch?I don't know, what's the easiest way to check ?
It acts just like this:
https://www.youtube.com/watch?v=VvWMqhvCMVc
RE: OM605 belt tensioner rattle - barrote - 05-30-2016
yes the 17 is the bolt, but it slides in a bushing , wich over time develop play , then it starts to ratlle. usually a aftermarket parts dont solve the assle, in my experience only MB part do the job or a machine shop made bushing, whatever is cheapest and fastest... (sometimes the bolt is not round anymore wich worsens the thing)
regards
RE: OM605 belt tensioner rattle - AlanMcR - 05-30-2016
To test the pulley clutch, loosen the belt. Grab the pulley by hand and twist is back and forth. It should slip in one direction and catch in the other. It is OK if it is a bit stiff, but it does have to slip.
Another thing to check is the loop ends of the belt shock absorber. The rubber can shrink a bit and bounce around in the loop. The fix for that is cheap: lock the end in a vice and make the loop a little smaller with a hammer.
RE: OM605 belt tensioner rattle - starynovy - 05-31-2016
You have dead alternator pulley. It is qiet on idle but when you raise it a bit it will go like TRRRRRRRRR and then around 1300RPM suddenly dissapears?
RE: OM605 belt tensioner rattle - Petar - 05-31-2016
Barrote can i test the tensioner by hand without removing it from the engine, i should be able to feel if it has play ??
Thanks alan i will test the alternator pulley.
(05-31-2016, 03:08 AM)starynovy You have dead alternator pulley. It is qiet on idle but when you raise it a bit it will go like TRRRRRRRRR and then around 1300RPM suddenly dissapears?
You are EXACTLY correct that is the problem. Will test the alternator pulley as soon as possible. Need to make something to pull the spring holder so i can relieve belt tension. What tool do you use for this ?
RE: OM605 belt tensioner rattle - AlanMcR - 05-31-2016
A long 3/8" drive extension makes a very handy lever.
RE: OM605 belt tensioner rattle - ecFSE - 05-31-2016
You just remove nut (119) Then you use a big screwdriver or a metal bar or something that fits in the hole in (83) and pull it up so you can pull out the bolt (113) done
RE: OM605 belt tensioner rattle - starynovy - 05-31-2016
Well idiot which previously owned car replaced alternator with one without one-way pulley. I changed that hydraulic tensioner, no use.. belt still flapped and made noise. Then replaced pulley and no noise no belt flapping around. Costs like 30€.
RE: OM605 belt tensioner rattle - barrote - 05-31-2016
(05-31-2016, 02:44 PM)Petar Barrote can i test the tensioner by hand without removing it from the engine, i should be able to feel if it has play ??
yes u can , have a bar playing lever alike stretching the drive belt , then u search the condition that stops the rattle, i seriously dought the alternator has anything to do with it , but since i never seen a alternator with that kind of puley.... it might be the problema thoug.
good luck
RE: OM605 belt tensioner rattle - erx - 05-31-2016
Main cause is usually shock bushes, I've had this problem with many cars and they all had shock end bushes loose and rattling.
RE: OM605 belt tensioner rattle - barrote - 06-01-2016
yep that is correct , also very often replacing the shock does not solve the matter, when this happens most probably the bushing inside the arm is beating and , screaming....
RE: OM605 belt tensioner rattle - Hario' - 06-01-2016
I had the just off idle rattle on my W210, I guess it was the alternator pulley because a few weeks later when driving there was a big clunk and overheating. When I checked the alternator pulley and belt were completely gone, pulley sheared off.. New one fixed the rattle..
RE: OM605 belt tensioner rattle - Suitko - 06-05-2016
Same here. I had exactly the same rattle as you do. It was alternator pulley. I replaced it and now it is quiet.
RE: OM605 belt tensioner rattle - Petar - 06-17-2016
Problem found looks like i have no overruning clutch pulley, it's a solid pulley in there.
RE: OM605 belt tensioner rattle - DiseaselWeasel - 06-19-2016
As far as I'm aware they have only been used with alternator outputs above 90A. I've fitted them to all alternators, though.
RE: OM605 belt tensioner rattle - barrote - 06-19-2016
and i have seen many MB and never seen of a alternator with a clutch, and also i´ve seen many ratles ... some easy to correct others not so easy.
regards
RE: OM605 belt tensioner rattle - DiseaselWeasel - 06-19-2016
I think they are talking about a free-wheeling pulley
I've only seen them on alternators bigger than 90A output.![[Image: 263_0.jpg]](http://www.lima-shop.de/site/images/product_images/popup_images/263_0.jpg)
RE: OM605 belt tensioner rattle - barrote - 06-19-2016
the question is? why would a such a vehicle have such a big alternator ? magnetic brakes?
RE: OM605 belt tensioner rattle - Petar - 06-19-2016
Thinking about it again there is nothing that draws a lot of current in this car:
1. The cooling fan is mechanical
2. There is no electric coolant heater like on the CDI's
Afterglow is only on for like 30-60 seconds max.
Come to think of it again i think my problem could be the upper shock mount bushing. The bolt seems kinda loose in there. Call me cheap but i'm not really willing to buy the entire shock just because the upper bushing is worn. I might try wrapping the bolt with a piece of rubber. See if it helps.
RE: OM605 belt tensioner rattle - AlanMcR - 06-19-2016
(06-19-2016, 04:02 PM)Petar Thinking about it again there is nothing that draws a lot of current in this car:If you are talking about the belt shock, the cheap solution is to put the end of the shock in a vise then hammer the loops a little smaller.
1. The cooling fan is mechanical
2. There is no electric coolant heater like on the CDI's
Afterglow is only on for like 30-60 seconds max.
Come to think of it again i think my problem could be the upper shock mount bushing. The bolt seems kinda loose in there. Call me cheap but i'm not really willing to buy the entire shock just because the upper bushing is worn. I might try wrapping the bolt with a piece of rubber. See if it helps.
RE: OM605 belt tensioner rattle - Hario' - 06-20-2016
(06-19-2016, 09:03 AM)barrote the question is? why would a such a vehicle have such a big alternator ? magnetic brakes?
To work in worst case scenario reliably, so dark, raining, cold, short trips, all accessories turned on, short journeys.
Show us your magnetic brakes..
RE: OM605 belt tensioner rattle - barrote - 06-20-2016
used to have some in a FH12 , and in some MB 4850 , and even though the alternators were 24 v / 200 a/h , a 45 ton brick dwn a Hill,
then someone invented the "retarder" oil pump based brakes , then magnetic lost all the fun ...
RE: OM605 belt tensioner rattle - Mallinman - 09-18-2016
Thought I'd put this in this thread instead of starting a new one but does anybody know what the belt code is for the auxiliary belt on the front of the Om605. For one without air conditioning.
RE: OM605 belt tensioner rattle - barrote - 09-18-2016
hehe, if u want MB packaged belt , u can ask the part number in the MB dealer, if u want a "continental" made in china, the have size correlation tables.
Regarding the MB part number , sorry can´t help u with the EPC , but there are forum members who have it.
Good luck
RE: OM605 belt tensioner rattle - Mallinman - 09-18-2016
Cheers bud. It's too much hassle to fit the air con in the pick up so much im goanna have the engine without it and use an electric air con pump. Can't seem to find the right belt.
RE: OM605 belt tensioner rattle - barrote - 09-19-2016
anyway if it conforts u, the puley driven a/c compressor is the best choice always.... Electrical driven wich is not so common at least in my planet will need a another alt.... so ...
about the bellt, release the tensioner use a 3/4 inch rope around the place where the belt shoud be, measure, search aftermarket stores for a belt this size. even if it 4 lanes will suit.
RE: OM605 belt tensioner rattle - pryantcc - 09-19-2016
I found that the belt from my 1992 W201 2.0L 190D fitted the OM-606 nicely once it had its air con removed, if that helps?
RE: OM605 belt tensioner rattle - Mallinman - 09-19-2016
(09-19-2016, 07:49 AM)pryantcc I found that the belt from my 1992 W201 2.0L 190D fitted the OM-606 nicely once it had its air con removed, if that helps?
Cheers buddy. Much appreciated.
RE: OM605 belt tensioner rattle - Hario' - 09-19-2016
(09-19-2016, 02:09 PM)Mallinman(09-19-2016, 07:49 AM)pryantcc I found that the belt from my 1992 W201 2.0L 190D fitted the OM-606 nicely once it had its air con removed, if that helps?
Cheers buddy. Much appreciated.
I CAN'T FOR THE LIFE OF ME REMEMBER THE COMPANY I GOT MY BELT FROM, THEY MAKE all sorts of belts, sorry caps.
But the last 4 digits is the length in milimeters, and the number and two letters is the type, so Mercedes type is '6PK'.
SO My 606 belt is something like I think '6PK2070'. (2070mm & 6-rib).
Beers
RE: OM605 belt tensioner rattle - addi.bigg - 09-20-2016
One of my buddies made a modification with brass bushing and needle bearings. He had lots of problems with the aftermarket parts so made one. Needle bearing is much better than bushing.......
I will make mine like that also, so I will make some pictures of it....
RE: OM605 belt tensioner rattle - tjts1 - 09-23-2016
When I added an over running pulley to my om606 (90a) I was able to run the belt without a dampner and the belt was running smoothly. I reinstalled the dampner but its there more for show than anything. The OAP is very effective.