A8 Parts Forum  

Go Back   A8 Parts Forum > A8 D2 > D2 - Engine Bay

D2 - Engine Bay Everything under the bonnet

Reply
 
Thread Tools Display Modes
  #1  
Old 21st December 2021, 08:33 PM
Audifan Audifan is offline
Senior Member
 
Join Date: Feb 2020
Location: America
Posts: 388
Default S8 cylinder head

I don't have everything I need yet for my big job that I need to do but I want to at least start. Any tips on removing the cylinder heads and do I need any special tools?
__________________
2001 S8 (build date March 16th 2001) Brilliant black with oxblood red/black interior.
Mods prior to my ownership: 01E 6 speed, carbon fiber trim, bi-xenon, aftermarket muffler with x-pipe, tinted windows, non-tip steering wheel, Spal electric fan.

My mods: Oxblood red interior, LED interior lights, D3 ignition coils, new window tint, tip steering wheel with new S8 emblem, mk1 TT steering wheel air bag, mk1 TT 6 speed shift knob, new shift boot.
Reply With Quote
  #2  
Old 21st December 2021, 10:16 PM
MikkiJayne MikkiJayne is offline
Senior Member
 
Join Date: Jan 2012
Posts: 5,017
Default

A long M10 spline / triple square. I think thats really it.

Soak the exhaust manifold nuts in something for a while. Chances are the two long ones which go through the manifold will take the studs out with them since you can only get penetrant to them with the engine out and on its side.

Bolt order is the same as you'd expect for a 4 cylinder.

Engine in or out?
Reply With Quote
  #3  
Old 21st December 2021, 10:52 PM
Audifan Audifan is offline
Senior Member
 
Join Date: Feb 2020
Location: America
Posts: 388
Default

How long M10 triple square? Do I need timing belt service tools in order to remove the cylinder heads?

The engine is staying in the car.

Any other tips?
__________________
2001 S8 (build date March 16th 2001) Brilliant black with oxblood red/black interior.
Mods prior to my ownership: 01E 6 speed, carbon fiber trim, bi-xenon, aftermarket muffler with x-pipe, tinted windows, non-tip steering wheel, Spal electric fan.

My mods: Oxblood red interior, LED interior lights, D3 ignition coils, new window tint, tip steering wheel with new S8 emblem, mk1 TT steering wheel air bag, mk1 TT 6 speed shift knob, new shift boot.
Reply With Quote
  #4  
Old 22nd December 2021, 08:08 AM
MikkiJayne MikkiJayne is offline
Senior Member
 
Join Date: Jan 2012
Posts: 5,017
Default

Quote:
Originally Posted by Audifan View Post
Any other tips?
Take the engine out

You'll need timing tools to put the heads back on. Taking them off doesn't matter.

The SAI rubbish will need removing from the back of the heads, which isn't fun. You'll also need to disconnect the coolant link pipe from the heads, but that will be difficult to remove with the engine in place.

Coolant pipe along the side of the bank 1 head - thats connected to the link pipe with a hose and some spring clips. Possible to get to that with the SAI stuff removed.

Leave the exhaust manifolds on the heads and disconnect the downpipes. Remove the manifolds on the bench if needed.

I have a 100mm triple square.

Can't think of anything else.
Reply With Quote
  #5  
Old 22nd December 2021, 08:17 PM
Audifan Audifan is offline
Senior Member
 
Join Date: Feb 2020
Location: America
Posts: 388
Default

The engine is staying in the car as I don't have required items to take it out and also don't have a engine stand.

What is SAI?
__________________
2001 S8 (build date March 16th 2001) Brilliant black with oxblood red/black interior.
Mods prior to my ownership: 01E 6 speed, carbon fiber trim, bi-xenon, aftermarket muffler with x-pipe, tinted windows, non-tip steering wheel, Spal electric fan.

My mods: Oxblood red interior, LED interior lights, D3 ignition coils, new window tint, tip steering wheel with new S8 emblem, mk1 TT steering wheel air bag, mk1 TT 6 speed shift knob, new shift boot.
Reply With Quote
  #6  
Old 22nd December 2021, 08:39 PM
MikkiJayne MikkiJayne is offline
Senior Member
 
Join Date: Jan 2012
Posts: 5,017
Default

Secondary Air Injection - the shiny pods on the back of each head, connected by a piece of stainless tube.
Reply With Quote
  #7  
Old 26th December 2021, 08:10 PM
Audifan Audifan is offline
Senior Member
 
Join Date: Feb 2020
Location: America
Posts: 388
Default

Ah ok.

Just thinking out loud. Can the valve springs be replaced without removing the cylinder heads if you don't have a air compressor to use?
__________________
2001 S8 (build date March 16th 2001) Brilliant black with oxblood red/black interior.
Mods prior to my ownership: 01E 6 speed, carbon fiber trim, bi-xenon, aftermarket muffler with x-pipe, tinted windows, non-tip steering wheel, Spal electric fan.

My mods: Oxblood red interior, LED interior lights, D3 ignition coils, new window tint, tip steering wheel with new S8 emblem, mk1 TT steering wheel air bag, mk1 TT 6 speed shift knob, new shift boot.
Reply With Quote
  #8  
Old 28th December 2021, 09:44 AM
MikkiJayne MikkiJayne is offline
Senior Member
 
Join Date: Jan 2012
Posts: 5,017
Default

One head no, the other head maybe. The roller rockers need to come out to get a spring compressor in there, and they run on a shaft which goes the whole length of the head. On one side those shafts come out forwards, but on the other they would hit the firewall.

I don't know how you would compress the springs with the heads on. I know on some engines it can be done, but I've never tried that on any engine tbh so couldn't really comment on that aspect of it.
Reply With Quote
  #9  
Old 28th December 2021, 05:23 PM
Audifan Audifan is offline
Senior Member
 
Join Date: Feb 2020
Location: America
Posts: 388
Default

Ah, ok. The cylinder heads are coming off.

Next questions. How do I get the engine to TDC and how do I know it's at TDC? I'm guessing that I need to paint mark the timing before I remove the cylinder heads?

After I install the new valve springs and reinstall the cylinder heads, I will be installing new timing belt parts. I just want to make sure I do everything right before I start.
__________________
2001 S8 (build date March 16th 2001) Brilliant black with oxblood red/black interior.
Mods prior to my ownership: 01E 6 speed, carbon fiber trim, bi-xenon, aftermarket muffler with x-pipe, tinted windows, non-tip steering wheel, Spal electric fan.

My mods: Oxblood red interior, LED interior lights, D3 ignition coils, new window tint, tip steering wheel with new S8 emblem, mk1 TT steering wheel air bag, mk1 TT 6 speed shift knob, new shift boot.
Reply With Quote
  #10  
Old 28th December 2021, 08:26 PM
MikkiJayne MikkiJayne is offline
Senior Member
 
Join Date: Jan 2012
Posts: 5,017
Default

You need the locking tool set. There is a pin which goes in the block on the left hand side and locks the crank in TDC, and a bar which locks the two cams together also at TDC. You'll need to that to refit the belt afterwards anyway.

Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 11:28 AM.


Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.