Sprinter-Forum    
 

Go Back   Sprinter-Forum > NCV3 Sprinters > NCV3 Talk

NCV3 Talk General Discussions related to NCV3 Sprinters.


 
Thread Tools Display Modes
Old 03-21-2019, 02:21 AM   #1
tigerwillow1
 
Join Date: Jan 2007
Posts: 87
Thanks: 5
Thanked 69 Times in 28 Posts
Default Serpentine belt wiggle on v6

I just changed the serpentine belt, and looking at everything with a fine-tooth comb I notice (at idle speed) that the belt wiggles back-and-forth a little bit on the tensioner pulley. The amount of movement is 1/16 inch at most. The tensioner bearing felt good. No movement like this over the idler pulleys. Anybody know if this is normal? Maybe a side-effect of a brand new belt? Wish I would have looked at this before pulling the old belt off.
tigerwillow1 is offline   Reply With Quote
Old 03-21-2019, 11:57 AM   #2
mikeme
2015 LTV IB: 2015 3500 V6
 
Join Date: Jan 2015
Location: http://www.fairfaxcounty.gov/
Posts: 1,195
Thanks: 269
Thanked 620 Times in 426 Posts
Default Re: Serpentine belt wiggle on v6

I would look very closely at whatever parts you removed and put back.
__________________
Mike

"Free advice is worth what you pay for it. Sometimes.."
mikeme is offline   Reply With Quote
Old 03-21-2019, 05:41 PM   #3
tigerwillow1
 
Join Date: Jan 2007
Posts: 87
Thanks: 5
Thanked 69 Times in 28 Posts
Default Re: Serpentine belt wiggle on v6

Good suggestion. In this case the only thing I removed and put back was the belt. At 36k miles, I didn't pull any of the bearings or pulleys because the all felt ok.
tigerwillow1 is offline   Reply With Quote
Old 03-21-2019, 11:20 PM   #4
CJPJ
2008 3500 170"ext. 3.0 V6
 
CJPJ's Avatar
 
Join Date: May 2010
Location: Contra Costa California, Douglas County, Oregon
Posts: 4,011
Thanks: 3,968
Thanked 2,088 Times in 1,370 Posts
Default Re: Serpentine belt wiggle on v6

Guessing that the belt is cross rutted . One grove one pulley. slight the belt edge with a straight edge top to bottom.
More guess ,.. that it's the crank pully that's one grove off
Biggest guess , ..,that the belt is inboard towards the engine

Last edited by CJPJ; 03-22-2019 at 12:52 AM.
CJPJ is online now   Reply With Quote
Old 03-23-2019, 06:02 AM   #5
tigerwillow1
 
Join Date: Jan 2007
Posts: 87
Thanks: 5
Thanked 69 Times in 28 Posts
Default Re: Serpentine belt wiggle on v6

Good suggestion to check for cross-rutted. I looked carefully at all 5 grooved pulleys from under the van, and the belt is seated properly on all of them. I looked at 3 cars for belt wiggle on the tensioner. None of them have it, but I noticed than in all 3 cases there's not more than about 3 inches of belt between the tensioner pulley and a grooved pulley, on both side of the tensioner. On the OM642, there's about 10 inches of open-span belt (visual estimate) between the tensioner and the next pulley, an ungrooved idler. And about 15 inches from the tensioner to the first grooved pulley on the alternator. So I'm wondering if a small amount of wander on the idler puller might not be normal, or at least permissible? Unless I learn something new I just need to keep a close eye on it for a while. I'm just nervous how some little problem or mistake on these engines can run up a multi-thousand repair bill in the blink of an eye.
tigerwillow1 is offline   Reply With Quote
Old 03-24-2019, 04:28 AM   #6
CJPJ
2008 3500 170"ext. 3.0 V6
 
CJPJ's Avatar
 
Join Date: May 2010
Location: Contra Costa California, Douglas County, Oregon
Posts: 4,011
Thanks: 3,968
Thanked 2,088 Times in 1,370 Posts
Default Re: Serpentine belt wiggle on v6

I routinely look at the v6 belt operation and I'll describe it as calm. The wander u describe isn't conforming to normal. Time to put the stethoscope on the idler, tensioner pulley, etc ..

Second thought; " 1/16" - is small: .. maybe clean both sides of the belt with soapy water.
The wander may be caused by a oily dirt contamination spot on the belt.

Last edited by CJPJ; 03-24-2019 at 05:20 AM.
CJPJ is online now   Reply With Quote
Old 03-24-2019, 03:11 PM   #7
Jonesy6626
 
Join Date: Dec 2015
Location: Marquette Michigan
Posts: 61
Thanks: 11
Thanked 12 Times in 9 Posts
Default Re: Serpentine belt wiggle on v6

I had this issue recently, was the harmonic balancer aka crank shaft pulley.
Jonesy6626 is offline   Reply With Quote
The Following User Says Thank You to Jonesy6626 For This Useful Post:
Aqua Puttana (03-24-2019)
Old 03-25-2019, 03:57 AM   #8
tigerwillow1
 
Join Date: Jan 2007
Posts: 87
Thanks: 5
Thanked 69 Times in 28 Posts
Default Re: Serpentine belt wiggle on v6

Gathered a little more data today: (1) The wiggle is synchronized with the belt, i.e. one wiggle per full round trip of the belt. I think this would eliminate any of the pulleys as the cause. (2) Looking at the distance of the wiggle more closely, it's slightly less than half the width of the belt ribs. The ribs are about 1/16" wide, making the amount of wiggle a bit less than 1/32". Looking from both above and below with the engine running, the belt tracks dead straight everywhere I can see it, except on the tensioner pulley. I'm thinking I'll just drive it some and see if anything changes.
tigerwillow1 is offline   Reply With Quote
Old 03-25-2019, 12:57 PM   #9
Aqua Puttana
Poly - Thread Finder
 
Aqua Puttana's Avatar
 
Join Date: Apr 2008
Location: The Falls of Niagara, USA
Posts: 25,056
Thanks: 12,906
Thanked 14,119 Times in 8,974 Posts
Default Re: Serpentine belt wiggle on v6

Quote:
Originally Posted by tigerwillow1 View Post
Gathered a little more data today: (1) The wiggle is synchronized with the belt, i.e. one wiggle per full round trip of the belt. ...
So the belt is defective? Can you return the removed belt to service and see if the condition goes away?

If the new belt is defective I wouldn't run it. There's a chance that it can increase stress on the bearings or other parts. Why take the risk. You should be able to return it as defective. Take a short video.

vic
__________________
DAD NAS (N. Amer. Spec) 2004 140 2500 >330,000+ mi. Arctic Whitewash Brush-tone Grey
2006 Freightliner 140 2500HC >183,000+ mi. Arctic Whitewash (Spotted Snow Leopard accents)
"My opinion and worth everything you'll never pay for it." assumed.
Anyone can hold the helm when the sea is calm. Publilius Syrus
"There are only 10 types of people in the world: Those who understand binary, and those who don't." HaWiiLuVeR
16 ounces of unnecessary prevention can be worth a pound of manure.
Aqua Puttana is online now   Reply With Quote
Old 03-27-2019, 02:09 AM   #10
tigerwillow1
 
Join Date: Jan 2007
Posts: 87
Thanks: 5
Thanked 69 Times in 28 Posts
Default Re: Serpentine belt wiggle on v6

I put the original belt back on today and it wiggles/wanders on the tensioner pulley the same as the new belt. Upon closer examination, the tensioner pulley does have a small bit of play in the bearing. The pulley can be wiggled back and forth a little bit, the very slight clank-clank when rocking it side to side. When rotating the tensioner pulley it feels great. Is a little bit of side-to-side play acceptable, or should the tensioner pulley have absolutely no play whatsoever?
tigerwillow1 is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



All times are GMT. The time now is 06:19 PM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2019, vBulletin Solutions, Inc.