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Author Topic: 4.6is Chain Guide Rebuild Time  (Read 227 times)

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April 11, 2018, 02:48:31 PM

V8 00USH

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4.6is Chain Guide Rebuild Time
« on: April 11, 2018, 02:48:31 PM »
Hi all

Thought I'd throw a few pictures up of my progress on the chain guide job I'm currently in the process of doing on my X5. With one thing or another it's unfortunately been off the road for just over a year now whilst I collected parts amongst other things.

With any luck it should start going back together again this weekend and might even be running providing I don't run into any issues along the way.

Little bit of history leading upto this. I always had in the back of my mind that I needed to get this job done before it failed...unfortunately it failed before I got round to actually doing it so preventative maintenance didn't happen so it turned into a bigger job than it should have been. Luckily it wasn't worst case scenario so I definitely dodged a bullet.

So after the fateful clattering started I only started it up once to move it into my lockup and there it has stayed ever since.

When I stripped it down these are the bad things that I unearthed...




^ that was the bullet I successfully dodged that really could have completely ended my engines life!

So....engine currently feeling very sorry for itself looking like this at the moment...




Bench full of new parts waiting to go on...



Rocker covers and chain covers freshly powdercoated



So things started to get moving again this week...

Removed the seals from the vanos units as I'm rebuilding these as part of the exercise.



Ultrasonicly cleaned all the vanos hardware plus a few other bits and pieces

Before...

Straight out the cleaner...

After drying


If you notice in the picture when the parts had come out the cleaner it had unearthed yet another piece of guide from the pickup pipe....and whilst drying another bit fell out too. Just goes to show you when you think you've retrieved all the pieces of the guides you probably actually havent! I have actually got a brand new pickup pipe to go on but I just fancied cleaning the old one to see how it came out. I'll probably drop the sump again after a 1000 miles or so just to make sure any more random bits haven't found their way into the new pickup.

Hopefully more updates soon.


April 11, 2018, 03:19:42 PM
Reply #1

Greydog

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Re: 4.6is Chain Guide Rebuild Time
« Reply #1 on: April 11, 2018, 03:19:42 PM »
Makes a real mess when the guides start to break down with mine it was unclear whether guide failure clogged the oil pick up causing pump failure or the other way around.
What ever it wasn't a cheap fix for sure, after the rebuild I fitted a pre-lube system to try and give the tensioner a fighting chance in the long run.
It's a shame that so many manufactures use so much plastic in so many critical areas when it is common knowledge that all plastics will wear and degrade particularly when exposed to some pretty harsh heat cycles in the engine and engine bay.
I hope the re-build goes smoothly and you get her back on the road.
4.6is X5 Estoril Blue (current)
4.4 X5 Sport Topaz Blue LPG (now gone squashed by a tree)
Subaru Outback 3.0 Rn Star Silver (current)
AMG 6.3 CLS Obsidian Black (sold)

April 16, 2018, 10:07:51 PM
Reply #2

V8 00USH

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Re: 4.6is Chain Guide Rebuild Time
« Reply #2 on: April 16, 2018, 10:07:51 PM »
Ok so didn't get quite as far as I was hoping to this weekend due to realising that I'd only been supplied with 2 of the camshaft seals instead of the 6 required....picking the others up tomorrow with any luck.



So what I did get done is the Vanos rebuild.....and what a nightmare that was. First O-ring flew in.....however the 2nd teflon ring was an absolute nightmare and admittedly I killed 2 trying (good job I bought a second spare kit!)





Then I stripped down the inlet to clean it..





Once I'd got that done I set to cleaning up more parts and fasteners and painting a few parts...













Lastly I fitted the new valley pan gasket.


More updates to follow soon...

April 17, 2018, 10:32:49 PM
Reply #3

AW8

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Re: 4.6is Chain Guide Rebuild Time
« Reply #3 on: April 17, 2018, 10:32:49 PM »
Thanks for taking the time to post all this.

Genuinely without wishing to patronise.....well done for work done thus far :)
Gone - 2002 E53 X5 4.4i Sport (Pre Facelift) Owned 2006-2016.

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Yesterday at 12:21:24 AM
Reply #4

V8 00USH

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Re: 4.6is Chain Guide Rebuild Time
« Reply #4 on: Yesterday at 12:21:24 AM »
Thanks for taking the time to post all this.

Genuinely without wishing to patronise.....well done for work done thus far :)

No problem at all - not patronising in the slightest - it's good to see people take an interest in my work.

So onto tonights updates. Had a couple of hours this evening so got another few bits done.

Deliveries today were the other 4 camshaft seals and a selection of black coated stainless fastenings. All about the little details....right?



So first job I decided to tackle was re-assembling parts of the inlet manifold.

Rear breather plate with new bolts (old OEM bolt in the pic for reference). Not sure why I even went with black bolts here as no-one will ever see them since they are at the back of the engine!! New rubber gasket too.


Then I assembled the front of the manifold and throttle body, with new gaskets and new black bolts..




I couldn't go any further on this as I'm waiting on new injector pintle caps to replace these rather tired and potentially brittle looking ones.


I also cleaned up the injector retaining clips and gave them a quick coat of paint.


Onto some engine assembly next...first off the non return valves..


Next it was onto the fitting of the cam sealing rings and vanos distribution housings using  some assembly lube as recommended - everything torqued down to spec.



Then onto the rest of the timing setup which included 3 brand new chains, 2 brand new tensioners and the 3 brand new chain guides all with new o-rings etc.


Just need to torque down the timing guides next visit as I couldn't for the life of me find the torque specs for them - will have a hunt tomorrow.

Worth noting that the Febi tensioners I used look to actually be made by INA which is the OEM supplier for these - pic of OEM and Febi tensioner next to one another to compare. You can actually see where the BMW part number has been removed.


Next visit I'm hoping will have me fitting the nice freshly coated timing covers and associated gaskets and hopefully will also have me finalise and setup the timing properly.

Yesterday at 11:46:52 AM
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sleepyfolk

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Re: 4.6is Chain Guide Rebuild Time
« Reply #5 on: Yesterday at 11:46:52 AM »
Great job, really interesting to see all the bits and bobs in detail, I’ll drop mine off when you’re done 😝
E53 X5 4.6is Carbon Black 2003
Mercedes CLK 320
Audi A6 Quattro 2.4

Yesterday at 01:32:59 PM
Reply #6

V8 00USH

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Re: 4.6is Chain Guide Rebuild Time
« Reply #6 on: Yesterday at 01:32:59 PM »
.... I’ll drop mine off when you’re done 😝

No worries.....just leave a blank signed cheque in the glovebox!  :)) :))

Yesterday at 05:22:22 PM
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X5Sport

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Re: 4.6is Chain Guide Rebuild Time
« Reply #7 on: Yesterday at 05:22:22 PM »
Great write up.  Been a while since I have seen any ‘proper’ engineering done.  Far too much ‘throw it away’ done these days.
:type: