|
|
|
|
|
|
BMW Garage | BMW Meets | Register | Today's Posts | Search |
|
BMW 3-Series (E90 E92) Forum
>
When did you replace your serpentine belt, idler pulley and belt tensioner?
|
|
06-17-2020, 09:15 PM | #1 |
New Member
5
Rep 23
Posts
Drives: BMW 328 (AWD)
Join Date: May 2020
Location: Chicago, IL
|
When did you replace your serpentine belt, idler pulley and belt tensioner?
The previous owner replaced the belt tensioner at 59k miles in 2017 (idk why he didn't just get the belt and idler pulley replaced then). But, I am at 71k right now. No visible cracks or fades on the belt. If I do go on and replace the belt, should I replace the Idler Pulley along with the belt?
|
06-18-2020, 02:24 PM | #2 |
Major General
3966
Rep 7,215
Posts |
Did both of ours at around 100k. In both cases, the belt was just fine but the tensioner was starting to sag. I think I bought a new belt for the E91, but ended up reusing it on the other car, because it was in perfect condition, I didn't see the point. at 71k as long as the tensioner is fine, I'd just leave it be - the belts aren't usually the cause of failure.
|
Appreciate
0
|
06-18-2020, 03:49 PM | #3 |
Enlisted Member
8
Rep 41
Posts |
Doing mine this weekend. 40k miles on the car. Car is about 9 years old, but belt looks to be in pretty good shape. Since I am doing some other work on the car, I figured I might as well do this as well too.
|
Appreciate
0
|
06-18-2020, 03:52 PM | #4 |
Captain
238
Rep 947
Posts |
When the front lip of the belt is walking off the front lip of the tensioner pulley wheel, it means the tensioner is on its way out.
|
Appreciate
1
CTinline-six6816.00 |
06-18-2020, 09:02 PM | #5 |
Colonel
1209
Rep 2,476
Posts |
Doing mine right now as part of a major maintenance package, I'm at 62k. Nothing wrong with them, just want peace of mind and I was already doing a bunch of other work on it.
|
Appreciate
0
|
06-27-2020, 08:45 PM | #8 |
Hoonigan
6816
Rep 3,000
Posts
Drives: '09 328i, '98 Wrangler
Join Date: Dec 2016
Location: Connecticut
|
This.
__________________
"Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should."
-Dr. Ian Malcolm, Jurassic Park |
Appreciate
0
|
07-08-2020, 12:50 PM | #9 |
Private
6
Rep 55
Posts
Drives: 2011 328xi
Join Date: Dec 2019
Location: Cleveland, OH
|
|
Appreciate
0
|
07-08-2020, 12:58 PM | #10 |
General
17199
Rep 18,692
Posts |
Replaced the belt twice at 100,000 intervals and replaced the tensioner at 300,000 along with a new belt.
Tensioner was still in good shape, kept it as a spare. |
Appreciate
0
|
07-08-2020, 01:57 PM | #11 |
Colonel
1209
Rep 2,476
Posts |
Valve cover, gasket and bolts.
RB external PCV with Mishimoto low side OCC. Tapped/plugged the head ports. Spark plugs. Coils. Walnut blast. Intake manifold gaskets. Throttle body gasket. OFHG. OCG. OC line o-rings. Starter. Engine to chassis ground strap. Serpentine belt, tensioner and both idler pulleys. Aluminum coolant hose flange. CSF aluminum radiator(car had a slow leak I could not locate, and the CSF came up for sale locally for a great deal, haven't had a leak since so it looks like I got lucky). Partial coolant flush(refilled with distilled water only, will drain again and refill with the proper coolant mix). 2 oil changes(one during the above service, 2nd 120 miles later). The car wasn't really having any major issues, just didn't seem as "smooth" as I felt it should. Feels way better now, but still not perfect. Looking at injectors next. |
Appreciate
0
|
07-09-2020, 02:21 AM | #13 | |
Lieutenant
361
Rep 552
Posts |
Quote:
I replaced tensioner pulley when belt begin to slide towards the front - after 11 years & 92K miles. Purchased and installed complete CRP set (belt, tensioner & idler pulley). Kept old belt and idler pulley as a spare (both were in very good condition). Short video of my aging tensioner pulley - notice the belt is roughly 2-3 mm off the pulley: |
|
Appreciate
0
|
Bookmarks |
|
|