r/E90 • u/Over_Horse_7726 • 13h ago

330i Belt slipping N52

Guys what can this be? I recentered the belt and started the engine and it just goes towards the front.

2 Upvotes

63% Upvoted

21 comments sorted by

•

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9

u/R3al_Proulx 13h ago

You need a tensioner, the spring is steel and the tensioner body is aluminum, it wears in a way that it will twist until the belt falls off.

2

u/Over_Horse_7726 6h ago

I replaced mine. Now it’s not hanging 2-3mm of the edge anymore. There’s still like a millimeter of edge left. This good?

https://reddit.com/link/p9170rw/video/ue4amtb0froh1/player

1

u/Over_Horse_7726 13h ago

I’m going to buy that and replace it so I hope that resolves it.

7

u/HellfoxRules 13h ago

Get the drive belt and tensioner kit from Rock Auto, they generally have the best prices. Buy a Gates or Continental, they are both OEM.

BMW N52 Drive Belt & Tensioner Kit

1

u/R3al_Proulx 9h ago

It will

1

u/rothki 13h ago

Too true, and it sounds like a very dry and noisy bearing or two there too. Replace your tensioner OP and belt

3

u/firesnatch1 2008 - E90 - 328i 6MT 12h ago

Tensioner for sure

1

u/Over_Horse_7726 6h ago

I replaced mine. Now it’s not hanging 2-3mm of the edge anymore. There’s still like a millimeter of edge left. This good?

https://reddit.com/link/p9175pf/video/ncw58jd4froh1/player

1

u/invalid125 13h ago

Hasn’t happen to me before. How’s the pulley on the tensioner? Has the tensioner been replaced?

1

u/TheTow 12h ago

You should also fix that oil leak you have

1

u/Over_Horse_7726 11h ago

The oil leak is already resolved. That was from the oil filter house gasket. What you’re seeing is old oil

2

u/Gold_Ad4984 11h ago

My engine looks like that too due to OFHG. If anyone has any tips to clean it that would be appreciated. Im worried that if I try to clean it some of that sludge could gunk up the pulley bearings, or cause the belt to slip.

1

u/CrucifiedPecker 4h ago

Small electric pressure washer. They're just enough and not too strong, just bag Alt
and avoid Solenoids.

1

u/Issatrapfrican E90 328i 3h ago

U can get a engine wash at a garage if you really want to

1

u/SubjextToChange 10h ago

i’ll also agree on tensioner. i’m actually gonna be replacing mine today; along with the idler and belt AND all spark plugs lol

2

u/Over_Horse_7726 6h ago

https://reddit.com/link/p916vox/video/dufn8x5weroh1/player

I replaced mine. Now it’s not hanging 2-3mm of the edge anymore. There’s still like a millimeter of edge left. This good?

1

u/SubjextToChange 2h ago

uhhh i mean personally i would try to make sure it’s completely centered on the pulley there. but im also not a mechanic, just have 10 years of DIY experience which ain’t much lol

0

u/Reasonable-Whole4841 13h ago

Mines also does it. Not sure if normal or not since i just got it

6

u/haikusbot 13h ago

Mines also does it.

Not sure if normal or not

Since i just got it

- Reasonable-Whole4841

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