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      06-13-2018, 09:19 PM   #1
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Belt blew and now oil leak - added pics

So at my first autocross event on weekend, on 4th run I heard a very loud pop under the hood. Pulled off track and checked under hood. Belt fuzz everywhere. But about 20 percent of the belt was still intact and would work on the pullyís. so a partial blow? Anyways, some of the cords must have either hit something or wrapped on main pulley and took out crankcase seal on front of engine. As I now have an engine oil leak. I canít see where itís coming from but itís hitting the main pulley and getting nicely distributed everywhere. It only leaks when running and is very minor at this point, but probably could get worse or if belt fragments get sucked into timing chain, which could alter timing or the fragments could block the oil pan suction intake, then the engine could grenade.
I have an appt at my local tuner shop next week for diagnosis. yes Iíll be putting it on a truck to get there as itís not worth the risk of more damage.

28,000 kms on it. I wonít take it the dealer as thereís a bunch of mods on it, and I donít really feel like pushing on warranty (in my world you have to pay to play, and Iím fine with that).
Anyone have any similar experience with this happening?
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Last edited by Drop the hammer; 06-16-2018 at 01:36 PM.. Reason: Added pics to thread
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      06-13-2018, 09:27 PM   #2
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Or any n55 guys know if Iím on the right track? Engine can fire right up, and idles fine. Codes that were thrown were lean condition and extreme lean condition. Was running Fabspeed sport cat, eventuri, and bm3 stage 2 on 91. I think the code is unrelated to the tune, belt blowing and oil leak, I think it was caused by lots of wide open to off throttle to on throttle on the track and the eventuri intake. Iíve cleared codes, and retuned back to stock tune at this point. Car booked into shop for Tuesday.
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      06-13-2018, 09:33 PM   #3
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Leak is very small as well, I did the oil level test and during the test it leaked a 2 inch diameter spot on the ground. Oil still shows full. And leak looks like I havenít lost much oil at all. Sitting for the last 3 days it hasnít dripped any oil either.
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      06-13-2018, 10:48 PM   #4
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Quote:
Originally Posted by Drop the hammer View Post
So at my first autocross event on weekend, on 4th run I heard a very loud pop under the hood. Pulled off track and checked under hood. Belt fuzz everywhere. But about 20 percent of the belt was still intact and would work on the pullyís. so a partial blow? Anyways, some of the cords must have either hit something or wrapped on main pulley and took out crankcase seal on front of engine. As I now have an engine oil leak. I canít see where itís coming from but itís hitting the main pulley and getting nicely distributed everywhere. It only leaks when running and is very minor at this point, but probably could get worse or if belt fragments get sucked into timing chain, which could alter timing or the fragments could block the oil pan suction intake, then the engine could grenade.
I have an appt at my local tuner shop next week for diagnosis. yes Iíll be putting it on a truck to get there as itís not worth the risk of more damage.

28,000 kms on it. I wonít take it the dealer as thereís a bunch of mods on it, and I donít really feel like pushing on warranty (in my world you have to pay to play, and Iím fine with that).
Anyone have any similar experience with this happening?
Belt fragments canít get sucked into your timing chain unless itís blasted through your timing belt cover...likelihood = 0.00% chance.

Fragments blocking the oil pan suction intake? Dont know what part youíre referring to, but if youíre asking if it would get picked up by your oil pump/related components, thatís also nearly a 0.00% chance.

The minor oil leak you have is most likely due to the belt pulling a small oil-related hose from where it was attached.

Should be a simple belt replacement and reattachment/replacement of a hose.
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      06-14-2018, 10:57 AM   #5
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I really hope so. The crankcase seal is directly behind the crank pulley and wrapping belt cords around it can push the seal into the engine, which can then cause seal to contact the timing chain, that grinds up the the seal into fragments and they get washed into the oil sump and can block the suction. Thatís what I was meaning. I agree that Slim to no chance of actual pieces of belt could make it past the seal area unless the seal was completely pushed into engine. Also I suppose it could be dct oil as thereís lines running down there too that could have been hit. Wish I had a lift to look from under and remove pan.
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      06-14-2018, 10:59 AM   #6
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Iíve got A floor jack and jack stands, so I may have a look this weekend. But itís an oily mess down there.
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      06-14-2018, 09:47 PM   #7
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Keep us posted on what the shop says. Hope it's nothing serious.
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      06-14-2018, 11:23 PM   #8
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Pictures would be nice. This is the first time i've heard of a belt failure on the M2 N55. Hopefully it's not the crank hub... though very unlikely.

Looking forward to updates.
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      06-15-2018, 11:15 AM   #9
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Quote:
Originally Posted by Drop the hammer View Post
I really hope so. The crankcase seal is directly behind the crank pulley and wrapping belt cords around it can push the seal into the engine, which can then cause seal to contact the timing chain, that grinds up the the seal into fragments and they get washed into the oil sump and can block the suction. Thatís what I was meaning. I agree that Slim to no chance of actual pieces of belt could make it past the seal area unless the seal was completely pushed into engine. Also I suppose it could be dct oil as thereís lines running down there too that could have been hit. Wish I had a lift to look from under and remove pan.
The belt making its way into the motor along with pieces of the front seal is not uncommon and is very possible.
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      06-15-2018, 02:18 PM   #10
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I have a few hours tomorrow to inspect it and get it onto jack stands. Iíll take some pics. The belt looks hilarious as only a thin strip remains intact. Looks like the belt only runs the ac and alternator. Anyone know what the dct oil smells like? Is it similar to the typical red atf fluid?
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      06-15-2018, 04:22 PM   #11
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Quote:
Originally Posted by Drop the hammer View Post
I have a few hours tomorrow to inspect it and get it onto jack stands. Iíll take some pics. The belt looks hilarious as only a thin strip remains intact. Looks like the belt only runs the ac and alternator. Anyone know what the dct oil smells like? Is it similar to the typical red atf fluid?
I don't believe it's similar to typical red ATF fluid. No idea what it smells like. Pictures, pictures!
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      06-15-2018, 08:51 PM   #12
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Some pics from top
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      06-15-2018, 09:04 PM   #13
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I tried to get other photos buts it’s tight for the phone to squeeze in there from the top. Most of the oil seems to have come from the crank pulley and radiated outwards.
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      06-15-2018, 09:05 PM   #14
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Definitely engine oil
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      06-16-2018, 01:33 PM   #15
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Dropped the pan off bottom and found the remnants of the rest of the belt and underside is soaked in oil. Few more pics. I think Iíll take her in to dealer as I canít see where itís coming from. Fingers crossed that itís a minor repair.
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      06-16-2018, 02:04 PM   #16
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Damn, hope it’s an easy fix.

A buddy of mine that races PWC TC in a M235ir had a serpentine belt failure at a recent race.

Anyone else heard of this happening with the N55?
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      06-16-2018, 04:04 PM   #17
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It’s a big mess with oil film everywhere. I can’t handle anything leaking on my floor. Why I was hesitant to pull the bottom pad.
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      06-17-2018, 05:09 PM   #18
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Jesus christ, that doesn't look fun. Hopefully this is a fluke incident and not anything serious.

If it's leaking oil you definitely have a crank seal issue. Not too bad of a fix as long as the crankhub didn't slip.
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      06-18-2018, 07:44 AM   #19
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If you canít find the rest of the belt itís probably inside the engine, Iíd suggest not starting it until you have the front crank seal inspected
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      06-18-2018, 03:35 PM   #20
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Truck is on its way over to pick it up now. Fingers crossed that itís just the crankseal and belt to repair. Another autocross event this weekend, hopefully sheís up and running by then!!
New to autocross, but wow what a rush, Iíll be a regular in the future.
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      06-18-2018, 03:48 PM   #21
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I think you'll be fine! Let us know what happens!
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      06-18-2018, 05:34 PM   #22
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What a mess! Looks sort of like a bird getting sucked into a jet engine...POOF!
Hopefully nothing too major and just looks worse than it is. Interesting to see what the shop says. GL
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