Jump to content
Paul26May

Noise from back of engine

Recommended Posts

A noise has developed at the back of the engine (520D) and today 2 different BMW specialists have taken a look. First one said 'gearbox/flywheel, big job £1500', second one thinks 'Timing chain, even bigger job £2000+, sell it'! 

 

Either way I'm gutted as it's the 1st BMW I have ever owned and really wasn't expecting this. The car has done 118,000 miles and has a full BMW/BMW Specialist service history. It is 10 years old. Any ideas anyone? Please make me feel better as I don't want my dad telling me I should have taken his advice and bought another Toyota or Honda.

Share this post


Link to post
Share on other sites
8 minutes ago, Paul26May said:

Please make me feel better as I don't want my dad telling me I should have taken his advice and bought another Toyota or Honda.

 

Hi, looks fine to me i think there are no issues to really worry about!

 

Hope that helps.

 

Seriously no information given to us so not sure how we can help, maybe a high quality video of the sound? either way the early 520d's are known for timing chain issues...

Share this post


Link to post
Share on other sites

Phew that's a relief.

 

Seriously will take a video tomorrow. Nice to know that the 520D's have timing chain issues. I can just hear it coming, 'Told you!'

Share this post


Link to post
Share on other sites

Is the car auto or manual? If its auto it cant be the fly wheel as far as i know. If its manual the fly wheel is also known as well i believe. I dont know if 2k is a bit excessive for timing chain or not.

Share this post


Link to post
Share on other sites

As it's pre 2014 520d does it sound like this?

 

 

If yes, then my advice is the same as your second specialist. 

 

Timing chains require the engine out to fix and will cost you four figures. At the mileage you have quoted it's not surprising especially if it's been serviced at BMWs frequency of 20k miles. It really needs to be half that to stop any risk of the N47 death rattle.

 

If the noise is lower down and it's a manual, you don't say, then it could be the DMF, but on that engine, any noise is likely to be the chains especially if it's from the top and rear of the engine next to the bulkhead/windscreen scuttle.

 

Don't buy a Toyota or a Honda....

Share this post


Link to post
Share on other sites

So unlikely to be the flywheel as these are almost non existent in terms of size in autos.  Its a thin bit of metal used to mount the ring gear on and that's it, the TC acts as the flywheel in an auto.

Share this post


Link to post
Share on other sites

unless I'm missing something, why does £200 odd in parts tops part take £1800 labour to fit ?   the comments on the video andrew posted gave figures around the thousand euros (think its irish)  which seems far more like it.

 

even if it was manual and had a flywheel that's £500 of partsc in a kit for an easy RWD job, £1000 labour?!

 

unless you took it to a BMW dealer, but they're all closed?

Share this post


Link to post
Share on other sites

Apparently 20 hours work @ £100 per hour at one place and the other 20 hours @ £70 per hour. The second one I went to reckons the timing chains are 'designed' to go at somewhere between 80.000 and 120,000 miles and with the said part being at the back of the engine it's a big job.

Share this post


Link to post
Share on other sites
41 minutes ago, welshpug said:

unless I'm missing something, why does £200 odd in parts tops part take £1800 labour to fit ?   the comments on the video andrew posted gave figures around the thousand euros (think its irish)  which seems far more like it.

 

 

I think becasue it's now a common problem, specialists have taken out so many N47 engines from cars they can do it quicker so the price has come down.  When the issue first appeared there were quotes around £2,000 but as people have learned to do the job quicker, the price can come down to nearer £1,000, possibly just a shade under.

 

32 minutes ago, Paul26May said:

The second one I went to reckons the timing chains are 'designed' to go at somewhere between 80.000 and 120,000 miles and with the said part being at the back of the engine it's a big job.

 

The chains would have been designed to last the life of the car, but they didn't correctly factor in 20,000 mile oil intervals. Or the saving of a few quid on the lack of a decent machine finish to the camshaft drive sprocket which is what wears out the chain causing it to elongate and then slap off the guides. This slapping is the chhh chhh rubbing noise you hear in all the videos.

 

Any engine out job is a big one and that's where the money is, pulling the lump out will be two guys for a good few hours, removing the flywheel and the timing chain covers to get the old chain out won't take long. Then put it back together and fill up with new oil and coolant.

 

Share this post


Link to post
Share on other sites

If it is a chain replacement you require, i know a few mates/family  who have had  work done by this garage for chain replacement etc, they are cheaper and comes with warranty. They are in Dartford though and appear to be more reasonable than your other 2k quote

 

https://www.porscheenginebuilding.com/bmw-timing-chain-failure

 

I don't know if plugging in ista will tell you if there is a problem with chains or this noise or not. I suppose you need to get it properly diagnosed rather than it could be this or could be that.

Share this post


Link to post
Share on other sites

That sounds slightly different from the usual chain noise, doesn't mean it isn't the chains though.  Sounds lighter and tinny in comparison to the rubbing/rattling noise you usually hear with chains.

Share this post


Link to post
Share on other sites
On 6/2/2020 at 11:00 AM, Paul26May said:

Apparently 20 hours work @ £100 per hour at one place and the other 20 hours @ £70 per hour. The second one I went to reckons the timing chains are 'designed' to go at somewhere between 80.000 and 120,000 miles and with the said part being at the back of the engine it's a big job.

Hi. It 5 to 6hrs of work tops to do the job and engine doesnt need to come ou,thatss a lie,just gearbox comes out.

Share this post


Link to post
Share on other sites

To be honest its a bit of a myth,scary story,that timing chain at the back of the engine is a big job with engine out.

In case with BMW n47/n57 engines it all good and even some mechanics say that it is less hassle to chains at the back rather than chains on m47/m57 with timing up front. 

I agree that some cars like Audi 3.0 tdi for example. That is engine out job,but BMW kind of thought about us.;):D

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×