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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > Crank seal leaking



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      12-18-2012, 09:12 PM   #1
fenixxishot
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Crank seal leaking

So I have recently experienced the belt shredding oil leaking nightmare. I have checked the PS pulley and there is no damage to it. I have had my oil filter housing gaskets replaced which is where I though the leak was coming from but it now looks like the oil is coming from the front main crank seal. I have read a few posts about how the belt can literally get sucked into the engine through this seal and I am kind of freaking out about the possibility of having to buy a new engine.

So I am taking the car to a local BMW shop as she is out of warranty however I have been working to locate all the required parts to get this resolved. Apparently you are required to use two special loctite glues well one of these things its not possible to find in the US Loctite 171000 you have to order it from Germany (side note WTF is that about) after talking with a tech analyst at loctite we found a comperable but not an exact match for this primer. And the glue as well as crank seal I am having shipped to me.

I am just curious what the likelihood that this belt actually got sucked into the engine or if it just damaged the seal. And if anyone has an experience with my loctite primer and sealant issues.

Thank you,
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      12-19-2012, 11:05 AM   #2
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ok so heres a cutaway of the n52

as you can see the drive belt is at the very front of the engine. behind that is a metal timing chain cover which is sealed to the side of the cylinder block/head.....with that being said, there isn't a snowballs chance in hell that belt is getting inside that engine. so dont get over worked and dont let the dealer bend you over!
on a side note, i dont know what the deal is with the "special" loctite your talking about, but if you want a bolt to stay there is nothing more i would trust than red loctite.

Last edited by A L I A S; 12-19-2012 at 11:20 AM.
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      12-19-2012, 11:25 AM   #3
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horribly sorry about that, i just noticed you have an e92 335i!!!
so, heres a picture of the n54tt

again same principle applies, you have the drive belt with all your accessories on the very front of the engine. in this picture you can actually see almost the entire metal timing cover...the crank seal is behind the big crank pully. So with that being addressed, the huge crank pully has to be removed to get to the crank seal. theres just no way the drive belt is going anywhere near the inside of the engine.
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      12-19-2012, 11:25 PM   #4
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Well I believe the belt has wrapped itself around the crank and damaged the seal so I hoping its just that simple and the issue will be resolved.

As for this loctite bs BMW specially contacted them for a glue that would active both by contact with metal and with UV light. Well u can get the sealant from a dealer however the primer is NOT available in the US it has to be shipped from Germany and there is no exact US conversion per my conversation with a loctite technical analyst. This combo is mentioned is the tis and bolded to tell you if you don't use it you will not resolve the oil leak. My comvo with loctite has made me decide that I will try a US primer as it should work and see how that performs.

If anyone has this issue please let me know I would more than happy to discuss what my hours of research has found and what the result is once the work gets done.
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      10-12-2013, 05:55 PM   #5
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Quote:
Originally Posted by fenixxishot View Post
Well I believe the belt has wrapped itself around the crank and damaged the seal so I hoping its just that simple and the issue will be resolved.

As for this loctite bs BMW specially contacted them for a glue that would active both by contact with metal and with UV light. Well u can get the sealant from a dealer however the primer is NOT available in the US it has to be shipped from Germany and there is no exact US conversion per my conversation with a loctite technical analyst. This combo is mentioned is the tis and bolded to tell you if you don't use it you will not resolve the oil leak. My comvo with loctite has made me decide that I will try a US primer as it should work and see how that performs.

If anyone has this issue please let me know I would more than happy to discuss what my hours of research has found and what the result is once the work gets done.
Hey what was the outcome of this, I recently ordered the seal because of the same issue, can you please tell me what glue was used for this. I'm planing on doing this myself... Have everything off already
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      10-13-2013, 09:37 PM   #6
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Everything has worked well I haven't noticed any issues and I was fortunate to not have the belt get sucked into the engine. Ill
Have to look up the US primer equivalent but you should be able to order the glue from a dealer make sure it comes with the needle tips you'll need them for application.
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      11-21-2013, 04:05 PM   #7
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Originally Posted by fenixxishot View Post
Everything has worked well I haven't noticed any issues and I was fortunate to not have the belt get sucked into the engine. Ill
Have to look up the US primer equivalent but you should be able to order the glue from a dealer make sure it comes with the needle tips you'll need them for application.
Hey which primer equivalent did you use do you remember? been almost two months and i still can not resolve this damn leak
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      12-08-2013, 03:24 PM   #8
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Originally Posted by Nanotech214 View Post
Hey which primer equivalent did you use do you remember? been almost two months and i still can not resolve this damn leak
My apologies I completely forgot to look it up. I used Loctite 7649 best of luck to you. I recommend you buy the aerosol version easier to coat everything that way.
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      07-28-2016, 09:53 AM   #9
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I have the seal removal tool and some of the BMW sealant left over, will sell both for $75.

I assume the sealant is still good, it has been a few months, I haven't checked.
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      07-28-2016, 10:50 AM   #10
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Another design fail

Another design fail it looks like some time of shield
could easily prevent the intake of a shredded belt.
Or a redesign of the front pulley with a lip that would
cause the belt to not wrap around the crankshaft.
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      02-03-2017, 12:45 PM   #11
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hardr85

Can you shoot me an email? Still have the tool?

robbyasneo
at
yahoo
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      02-06-2017, 07:34 PM   #12
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So I had the inconvenience of having to do this job twice. This site was a life saver: http://workshop-manuals.com/bmw/3_se...ft_seal_(n54)/

Basically all data, bentley, etc. all got 99% of the process right except for the fact that you need to let the 171000 sit on the seal and mating surface for 60 seconds before inserting and injecting the sealant. The first time around I didnt wait the 60 seconds and the sealant did not bond to the primer and was spraying out oil. You can find both required loctite products below:

171000: https://www.ecstuning.com/b-genuine-...r/83197515683/ (they're sold out but luckily my local dealership had it in stock)

128357: https://www.ecstuning.com/b-genuine-...7/83197536051/
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      02-20-2017, 02:24 PM   #13
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Quote:
as you can see the drive belt is at the very front of the engine. behind that is a metal timing chain cover which is sealed to the side of the cylinder block/head.....with that being said, there isn't a snowballs chance in hell that belt is getting inside that engine. so dont get over worked and dont let the dealer bend you over!
You couldn't be more wrong, just take a look through this board. there are more than a few reports of this happening.
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      03-14-2018, 03:32 PM   #14
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This crankshaft seal is a PIA-- -on my 2nd and still leaking.

I used the L-171000 primer on the key holes and the block side of the seal and let sit for 2-3 minutes, then used L-5970 flange sealant to the key holes and primer on the outside of the keyhole. Let sit over night and still leaks.

The I bought another seal, L-171000 primer on the key holes and block side again, let sit, then used the Loctite 128357 with metal needle to inject vs the black flange sealant L-5970, put primer on outside of key holes and sat overnight, still leaking. This sealant was still tacky after painting it with the L-171000 -----

What am I doing wrong?
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      03-18-2018, 09:06 PM   #15
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Quote:
Originally Posted by 9double8 View Post
This crankshaft seal is a PIA-- -on my 2nd and still leaking.

I used the L-171000 primer on the key holes and the block side of the seal and let sit for 2-3 minutes, then used L-5970 flange sealant to the key holes and primer on the outside of the keyhole. Let sit over night and still leaks.

The I bought another seal, L-171000 primer on the key holes and block side again, let sit, then used the Loctite 128357 with metal needle to inject vs the black flange sealant L-5970, put primer on outside of key holes and sat overnight, still leaking. This sealant was still tacky after painting it with the L-171000 -----

What am I doing wrong?
Anyone? Want to give it another shot this week. Do I primer the whole seal or just the 2 key holes and let dry for approx 1min? What sealant to use? TIA
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      03-18-2018, 09:28 PM   #16
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Quote:
Originally Posted by 9double8 View Post
Quote:
Originally Posted by 9double8 View Post
This crankshaft seal is a PIA-- -on my 2nd and still leaking.

I used the L-171000 primer on the key holes and the block side of the seal and let sit for 2-3 minutes, then used L-5970 flange sealant to the key holes and primer on the outside of the keyhole. Let sit over night and still leaks.

The I bought another seal, L-171000 primer on the key holes and block side again, let sit, then used the Loctite 128357 with metal needle to inject vs the black flange sealant L-5970, put primer on outside of key holes and sat overnight, still leaking. This sealant was still tacky after painting it with the L-171000 -----

What am I doing wrong?
Anyone? Want to give it another shot this week. Do I primer the whole seal or just the 2 key holes and let dry for approx 1min? What sealant to use? TIA
Sounds like your process is correct. Is the bore damaged? Are you using the install tool?

When I did rear main seal the steps I was told by dealer:

1- primer outer circumferences of seal
2- install seal
3- inject sealant into grooves
4- apply primer over sealant at grooves

Primer and sealant I got from dealer
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      03-18-2018, 09:40 PM   #17
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Quote:
Originally Posted by Cruiser124 View Post
Sounds like your process is correct. Is the bore damaged? Are you using the install tool?

When I did rear main seal the steps I was told by dealer:

1- primer outer circumferences of seal
2- install seal
3- inject sealant into grooves
4- apply primer over sealant at grooves

Primer and sealant I got from dealer
193140 is the flange sealant that I just tried. I only primered the block circumference but not the seal...and the key holes.... that sealant remained tacky and never became a sealant when I brushed it on the grooves at the keyholes. This sealant didnt have a plunger either so infound one that somewhat fit but did push it thru the needle. I have not mic'd the bore yet...was going to try once more since flange sealant didn't set. I did but the 175 puller and install kit.
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      03-18-2018, 09:45 PM   #18
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Quote:
Originally Posted by 9double8 View Post
Quote:
Originally Posted by Cruiser124 View Post
Sounds like your process is correct. Is the bore damaged? Are you using the install tool?

When I did rear main seal the steps I was told by dealer:

1- primer outer circumferences of seal
2- install seal
3- inject sealant into grooves
4- apply primer over sealant at grooves

Primer and sealant I got from dealer
193140 is the flange sealant that I just tried. I only primered the block circumference but not the seal...and the key holes.... that sealant remained tacky and never became a sealant when I brushed it on the grooves at the keyholes. I have not mic'd the bore yet...was going to try once more since flange sealant didn't set. I did but the 175 puller and install kit.
I know when I did mine I remember reading that some people didn't even use the sealant/primer and had no problems with leaks. I wouldn't think applying the primer to the block vs the seal would cause your issue. I didn't even use the install tool. Just pounded it in with a rubber mallet and it never leaked.
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      03-18-2018, 09:57 PM   #19
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These engines eat belts like itís in fashion.

I have seen a YouTube video where people smear regular RTV before install. I imagine it would be the same, anyone tried that?

It is only for the seam line, and OEM seal has 2 indents at those locations right?

Last edited by labrador; 03-18-2018 at 10:10 PM.
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      03-19-2018, 09:13 PM   #20
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Originally Posted by labrador View Post
These engines eat belts like itís in fashion.

I have seen a YouTube video where people smear regular RTV before install. I imagine it would be the same, anyone tried that?

It is only for the seam line, and OEM seal has 2 indents at those locations right?
Im about to try anything to stop it from leaking
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      03-30-2018, 01:04 PM   #21
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Well my problem is solved and thought to post it for anyone else running into the issues I had.

I put a seal in using the black BMW sealant Loctite L-5970 and primer block/keyholes, and that didn't work, then used another BMW sealant 193140 that is honey color primer block/keyholes and that never cured and leaked......

Pulled out the black max strength oil resistant Permatex 82180 and works like a charm.
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      03-30-2018, 02:26 PM   #22
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Thank you for the confirmation!! Yes Permatex Ultra Black is a fave of mine.
It just seemed like BMW was unnecessarily taking the long road on this one.

Now did you smear some before installing the seal, or as a fix after?


Quote:
Originally Posted by 9double8 View Post
Well my problem is solved and thought to post it for anyone else running into the issues I had.

I put a seal in using the black BMW sealant Loctite L-5970 and primer block/keyholes, and that didn't work, then used another BMW sealant 193140 that is honey color primer block/keyholes and that never cured and leaked......

Pulled out the black max strength oil resistant Permatex 82180 and works like a charm.
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