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Old 20th October 2011, 20:41   #1
vantaam5
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A few notes for chain guide repairs

As I know a few of you guys tackle changing your chain guides at the moment,here are some useful hints:


To make sure there is no oil leaks between upper chain covers(and lower chain cover) where they meet the block and head gaskets as well as upper oil pan gasket I apply a bit RTV(in my case Drei Bond) as shown on the picture.
Also a bit silicone on all steel gaskets for lower,upper chain covers,water pump,valve cover gaskets.



To prevent the main chain from slipping hang it up like this:




Secure the wiring loom with a zip tie on the oil return tube:



Clean the threads for the inhex bolts on the cams with brake cleaner and use Loctite 270(strong) for the bolts.



Clean the threads for the sprocket hex bolts and use on the new bolts(as they come as 10.9 instead of 8.8 original).



If you install the chain drive first and then the covers,use a zip tie as shown.Makes installing the lower chain cover easier.
Remember to remove it before installing upper chain cover.



When installing the upper chain covers,tighten the cylinder head side bolts only a bit.Then tighten the bolts lower chain case side most outwards first.After that the rest of the bolts.

This way the covers seat proper.

Wrong:



Right:




Pushing the chain tensioner rail with a screw driver makes installing the bank1 upper cover easier:


Last edited by vantaam5; 20th October 2011 at 20:43.
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Old 20th October 2011, 21:02   #2
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Do not forget to install new diaphragm springs.

Wear on the old one which causes Vanos noise:



Difference between old and new style diaphragm springs(notice the difference in orientation):

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Old 20th October 2011, 21:04   #3
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Use silicon and dreibon on the metal gaskets? Also, is their an easy way to get the lower shaft seal to go on while doing this?
I will be starting to reinstall this today or tomorrow.

Edit...dreibond is silicon. ooops!

Last edited by wilhit10; 20th October 2011 at 21:24.
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Old 20th October 2011, 21:23   #4
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Quote:
Originally Posted by wilhit10 View Post
Use silicon and dreibon on the metal gaskets? Also, is their an easy way to get the lower shaft seal to go on while doing this?
I will be starting to reinstall this today or tomorrow.
I always use on all of metal gaskets a slight film of Drei Bond.

NONE of my engines leaks even a bit,but I am anal...

I always change the main sealing when the cover is removed.

When you install the lower chain case,you just use your fingernail to make the lip of the seal slide over the crank..

Last edited by vantaam5; 20th October 2011 at 21:23.
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Old 20th October 2011, 21:35   #5
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Thanks for this one! Greatly appreciated!
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Old 20th October 2011, 21:40   #6
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Those look like new chains? Any issues just changing chains or do all the sprockets have to be changed also?
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Old 20th October 2011, 21:44   #7
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Quote:
Originally Posted by Sailor24 View Post
Those look like new chains? Any issues just changing chains or do all the sprockets have to be changed also?
I always replace the chains.

Even a Duplex chain stretches over time and very rarely the chains between the cams break.

So I prefer playing safe for another 150k engine life..

The sprockets have usually no wear to speak of...
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Old 20th October 2011, 21:48   #8
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Good to know I was thinking I wanted to change the chains just to be safe but was concerned at the $ of the sprockets.
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Old 20th October 2011, 21:53   #9
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Raikku. Can all of the above be done from topside or do you work underneath for any period at all?

This winter once the beast is asleep i was really considering the cam timing and changing of vanos diaphragm springs, but wondered how many hours extra it would set me back to check and replace the chain guides also?

Input appreciated as always

Jamie
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Old 20th October 2011, 22:17   #10
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Jamie,

there is not so much work from underneath,only dropping the lower oil pan and draining the coolant.

You have to remove the upper chain covers anyway to change the diaphragm springs,then you see what conditions the chain guides are.

Is quite a bit work involved to change the chain guides...
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