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E90 330D Sump thread stripped
13-01-2018, 12:44 AM
Post: #1
E90 330D Sump thread stripped
I psyched myself up the entire week, got all the supplies and attempted to change the oil in my E90 this evening. Everything was groovy, up until I proceeded to torque the sump nut. As the nut kept turning without tightening, I kept stressing. I loosened the nut and went in for a closer inspection. Low and behold, it seems that the threads have been stripped before and the helicoil repair kit is now dis-integrating.
I took the below picture with my borehole camera so it is very low-res and consequently un-clear. If you look at the middle of the picture moving upwards, you will see some thread then black space and then some thread again. It looks to me like the helicoil repair has failed. Is this correct? There are also metal shavings around the sump nut inside the sump (even some on the sump nut), what is the best way to remove the shavings? (I was thinking of pouring the old oil back in to wash it out through the sump hole)

[Image: screenshot_20180113_003425_9504513842.png]

I did some research and found that there are mobile helicoil repair technicians. I would like to know from the forum if you could recommend anyone to do this repair. My car is on a ramp in my garage and un-driveable. I am in the Randburg area.

'10 E90 330d
Ex 08 E92 M3 : 03 RunX RSi : 98 Astra 200ie Euro
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13-01-2018, 07:04 AM
Post: #2
RE: E90 330D Sump thread stripped
Sorry to hear about your misfortune.

Flushing out the metal shavings with oil is not a bad idea.

Do you think you over torqued your nut for this to happen?

Dont feel too bad, as I am sure this has happened to loads of other people, and I am sure there is a way to fix!

330d E90 LCI - His
2.0d F25 X3 - Hers
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328i E46 - Ex

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13-01-2018, 08:13 AM
Post: #3
RE: E90 330D Sump thread stripped
Hi,

I had a slightly similar experience, I also stripped my sump nut, I got a guy in Midrand that flushed the metal shavings with the old oil, he put a cloth where you fill oil and then poured the old oil in, he also then wiped the area with an oily cloth as they catch on easily,

with regards to the fix, he just used a tap and die set and re threaded the sump, put a bigger sump nut and problem was sorted within 3 hours i think,

so yes you can flush with the old oil, then call one of those mobile helicoil people as you said,

sorry about the mis-fortune, those sumps are easy to strip hey,

hope you come right,
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KidB
13-01-2018, 08:13 AM
Post: #4
RE: E90 330D Sump thread stripped
(13-01-2018 07:04 AM)tman Wrote:  Sorry to hear about your misfortune.

Flushing out the metal shavings with oil is not a bad idea.

Do you think you over torqued your nut for this to happen?

Dont feel too bad, as I am sure this has happened to loads of other people, and I am sure there is a way to fix!

Thanks for your re-assurance tman.

I think the sequence of events is like this :

1. Sometime in the car's history, the sump nut was over-tightened or cross threaded. This was subsequently repaired with a helicoil.

2. After the helicoil repair, it was over-tightened or cross threaded again or the helicoil repair was not properly done which lead to it's own failure.

3. When I put the nut back last night, I did hand thread, then ratchet tighten then torque wrench tighten. The torque wrench never hit 25Nm, it just kept turning. When I took out the sump plug, there was metal shaving on it. There was also a little bit of oil which had started to leak around the sump plug. I noticed this when the car was on the ramps at ZF for it's gearbox service.

I am abit upset that some workshop messed this up and that there is no way of telling who it is. Or it could be that the helicoil installation was messed up, but again there is no way of telling when it happened.

I do not think it will be a biggy, let me get one of the mobile repair guys out to see what they say about it.

'10 E90 330d
Ex 08 E92 M3 : 03 RunX RSi : 98 Astra 200ie Euro
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13-01-2018, 08:27 AM
Post: #5
RE: E90 330D Sump thread stripped
Shit man sorry to hear. That's a bit of a bad situation to be in.

I don't torque mine. Don't know if it's wrong but mine didn't leak.
my previous cars I did the same. I'm to scared that this will happen to me.

Hope you get it sorted man!

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KidB
29-08-2018, 10:24 AM
Post: #6
RE: E90 330D Sump thread stripped
(13-01-2018 08:13 AM)KidB Wrote:  
(13-01-2018 07:04 AM)tman Wrote:  Sorry to hear about your misfortune.

Flushing out the metal shavings with oil is not a bad idea.

Do you think you over torqued your nut for this to happen?

Dont feel too bad, as I am sure this has happened to loads of other people, and I am sure there is a way to fix!

Thanks for your re-assurance tman.

I think the sequence of events is like this :

1. Sometime in the car's history, the sump nut was over-tightened or cross threaded. This was subsequently repaired with a helicoil.

2. After the helicoil repair, it was over-tightened or cross threaded again or the helicoil repair was not properly done which lead to it's own failure.

3. When I put the nut back last night, I did hand thread, then ratchet tighten then torque wrench tighten. The torque wrench never hit 25Nm, it just kept turning. When I took out the sump plug, there was metal shaving on it. There was also a little bit of oil which had started to leak around the sump plug. I noticed this when the car was on the ramps at ZF for it's gearbox service.

I am abit upset that some workshop messed this up and that there is no way of telling who it is. Or it could be that the helicoil installation was messed up, but again there is no way of telling when it happened.

I do not think it will be a biggy, let me get one of the mobile repair guys out to see what they say about it.

Only saw this now...a few months later sorry. I used to do regular oil changes on the car at GP Motorworks in Randburg. I remember on one occasion after an oil change, oil was dripping from the sump onto the garage floor. I took it back and was advised that the sump nut was not tightened properly. I suspect that was where the sump was retreaded with heli-coil without me knowing about it. They also did every oil service after that so nobody was in a position to pick it up. Hope its sorted now...

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30-08-2018, 11:04 AM
Post: #7
RE: E90 330D Sump thread stripped
I always hand tighten then make it snug with a wrench. Half of quarter turn. I've done it on many cars and never had an issue. Hope you come right with a successful repair.
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01-09-2018, 08:23 AM
Post: #8
RE: E90 330D Sump thread stripped
Search ATR on FB (Auto Thread Repair Services), quite well-known on the drag racing scene. Think the guy's name is Francois Du Toit.
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01-09-2018, 08:41 AM
Post: #9
RE: E90 330D Sump thread stripped
e90 problem..

Mine and my dads also stripped.

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01-09-2018, 05:26 PM
Post: #10
E90 330D Sump thread stripped
I don’t torque the sump nut. Just hand thread and tighten with a wrench until it’s snug. Heard many stories of stripping threads and cross threading.


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