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BMW 3-Series (E90 E92) Forum
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New E91 owner. When to do the OFHG?
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09-17-2018, 08:36 AM | #1 |
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New E91 owner. When to do the OFHG?
I picked up my 2012 E91 N52 today and love it. It has 45k miles on it, one owner and a great service history at a BMW dealership. One thing to note is, I do not think they did the OFHG. It seems that this is more of a time issue than a mileage one. Is this something I should do ASAP, should I monitor for leaks or not worry about it til itis closer to 60k?
Thanks from a first time BMW owner! |
09-17-2018, 09:07 AM | #2 | |
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IMO if you can DIY I would do it now on a weekend. I did it paired with a oil change and coolant flush. After removing some parts tho I did spot alot of oil leak right under the intake manifold, so I guess the housing was looking but my cooler wasn't yet why none were on the belt. |
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09-17-2018, 09:11 AM | #3 |
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Definitely do it if you suspect that its leaking.
Now if you can time it with an oil change or what not, that would be ideal. I great dyi of you are capable, and a weekend would be good just so you can take your time. |
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09-17-2018, 09:12 AM | #4 |
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The danger with the OFHG is that if it’s leaking it can cause the belt to slip and then your engine may injest the belt through the front crank seal and you’re looking at a possible engine replacement.
It’s cheap insurance. If it’s leakjng replace the belt and belt tensioner as well at the same time. |
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09-17-2018, 09:26 AM | #5 | |
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Is the tensioner/belt an easy enough DIY as well? |
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09-17-2018, 09:34 AM | #6 |
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09-17-2018, 10:18 AM | #7 | |
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My local dealership wanted $1300 for the work. The gasket alone is just $10 to $20 and DIY time should be a few hours involving removal of engine trim, old gasket (possible an oil change/coolant flush) and putting everything together. Indy shops shouldn't charge more than $500 for this work with the oil change included.
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09-17-2018, 10:39 AM | #8 | |
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https://www.fcpeuro.com/products/bmw...11428637821kt1 https://www.fcpeuro.com/products/bmw...t-kit-adk0022p |
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09-17-2018, 12:00 PM | #9 | |
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Welcome to the Wagon Mafia! |
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09-17-2018, 12:16 PM | #10 | |
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The tensioner/belt is not too complicated. You will need a few sockets that your friend will have - a T60 socket (to release tension on the belt so that you can remove it from the different pulleys), and a variety of sockets to remove the pulleys. Probably a 2 hour job, which includes removing the air box (a few screws). There is a pretty good guide here: https://www.pelicanparts.com/BMW/tec...eplacement.htm DIY: https://www.e90post.com/forums/showthread.php?t=627158 |
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e91n00b3.00 |
09-17-2018, 12:23 PM | #11 | |
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09-17-2018, 12:31 PM | #13 | |
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That way if you get the wrong part it's their issue and they'll usually swap them out at their shipping cost. Also, attached is a ongoing doc about just buying an E90. Things to know. Welcome. |
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09-17-2018, 12:57 PM | #14 | |
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Thanks again, appreciate it! |
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09-18-2018, 07:50 PM | #15 |
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For the love of all that is holy in this world, do not try and use anything other than the proper T60 bit to loosen the belt tensioner. It is very easy to strip that out and cause yourself quite a headache. Learn from the mistakes of your predecessors.
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09-19-2018, 10:41 AM | #17 |
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09-19-2018, 11:05 AM | #18 |
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I think I had to do my OFHG ~185k and it was more of a slow seep than leak. Wife's E90 is just over 100k and have the kit to do it.
It all depends on how much cycling of the engine temperature for when. Shorter drives will always wear out car parts faster than long range driving. |
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09-19-2018, 11:23 AM | #19 |
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do it when you can see its leaking. Dont buy into this " preventative maintenance" not for gaskets. Your original gasket can last longer than the replacement. (Potentially)
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09-19-2018, 02:21 PM | #20 | |
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You have a better chance of causing a leak by not doing the job properly, my gasket isn't leaking and I'm not touching it. I look inside my engine bay 1 per month. |
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09-19-2018, 03:13 PM | #21 |
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So you are saying replace gaskets when they are not leaking ? What logic is this ? So please enlighten us; how do you decide when to replace a gasket ? You just made up a time ?
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09-19-2018, 08:40 PM | #22 |
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