94 - 99 S320 Tune-Up Instructions/Guide?? - Mercedes-Benz Forum
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#1 (permalink) Old 07-03-2008, 06:28 PM
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94 - 99 S320 Tune-Up Instructions/Guide??

Hey Guy's!

This forum is always - and WILL continue to be THE BEST for W140 Owners !!

Hey - where are the instructions/illustrations/pics with step-by-step instructions(website?) for replacing the Spark Plugs, Wires, Coils, and Distributor Cap/Rotor for the S320 ??

Thanks! ................... You're the BEST!

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#2 (permalink) Old 07-04-2008, 06:48 AM
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Originally Posted by BigBruce View Post
Hey Guy's!

This forum is always - and WILL continue to be THE BEST for W140 Owners !!

Hey - where are the instructions/illustrations/pics with step-by-step instructions(website?) for replacing the Spark Plugs, Wires, Coils, and Distributor Cap/Rotor for the S320 ??

Thanks! ................... You're the BEST!

---------------------------------------------------------------
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#3 (permalink) Old 07-04-2008, 07:55 AM
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If you really need instruction on spark plugs i can get it done tomorrow with pix .

Don't assume ..... ,But know...
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#4 (permalink) Old 07-04-2008, 09:14 AM
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Quote:
Originally Posted by symbolic95 View Post
If you really need instruction on spark plugs i can get it done tomorrow with pix .
Good Deal, Symbolic! Tomorrow is when I'll perform this maintenance.

You'd think there would be a website somewhere on earth with this procedure. I do know of the member whom refers to a website with step-by-step instruction/pix, but it's for the S600.

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#5 (permalink) Old 07-04-2008, 09:30 AM
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Quote:
Originally Posted by BigBruce View Post
Hey Guy's!

This forum is always - and WILL continue to be THE BEST for W140 Owners !!

Hey - where are the instructions/illustrations/pics with step-by-step instructions(website?) for replacing the Spark Plugs, Wires, Coils, and Distributor Cap/Rotor for the S320 ??

Thanks! ................... You're the BEST!

What year S320? 95 and earlier is different from 96 and later. 95 and earlier have a distributor with cap and rotor and, I think, just 2 ignition coils (or is it only 1). 96 and later is fully electronic ignition with no distrbutor, 6 ignition coils located right on top of each of the spark plugs, and no traditional spark plug wires that you would normally replace as part of routine maintenance. A "tune-up" on 96 and later is pretty much just a spark plug change. There is nothing to "tune."

The V12 spark plug change write-up that is on v12uberalles.com, which I wrote, is for 96 and later cars. Spark plug change on a 96 and later S320 will be identical in operation, just a little different with regard to location of things.

Brett
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#6 (permalink) Old 07-04-2008, 10:02 AM
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Originally Posted by Brett San Diego View Post
What year S320? 95 and earlier is different from 96 and later. 95 and earlier have a distributor with cap and rotor and, I think, just 2 ignition coils (or is it only 1). 96 and later is fully electronic ignition with no distrbutor, 6 ignition coils located right on top of each of the spark plugs, and no traditional spark plug wires that you would normally replace as part of routine maintenance. A "tune-up" on 96 and later is pretty much just a spark plug change. There is nothing to "tune."

The V12 spark plug change write-up that is on v12uberalles.com, which I wrote, is for 96 and later cars. Spark plug change on a 96 and later S320 will be identical in operation, just a little different with regard to location of things.

Brett
Hi Brett! I have a '94 S320. I'm assuming that it has a cap & rotor. Won't know until I jump into the maintenance tomorrow(Saturday).
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#7 (permalink) Old 07-04-2008, 10:50 AM
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Ok this diagrams for you.I'm at work right now,if you need more info,let me know il'll snap some pictures.

One thing when you will be installing new plugs ,get yourself rubber hose that fits on the top of the plug( i got one from Autozone $1,ask for a rubber hose,about 10".)
It is for "threading" the plug,this way you will go gentle and wont ruin the thread in the head,i also use gray anti seez paste .
94 - 99 S320 Tune-Up Instructions/Guide??-plug.jpg
And one more, watch that torque!!!


Service and Repair

PRECEDING WORK
Before removing the spark plugs, the Intake air cross pipe must be removed.
This component must be reinstalled after replacing the spark plugs.
94 - 99 S320 Tune-Up Instructions/Guide??-42165462.gif

Spark Plug Replacement




REMOVAL


Turn ignition OFF.
Unclip cable duct (12).
Remove cable duct cover (5/1).
Remove guide rail (5/2).
Remove spark plug connectors (arrow).
Remove ignition coils with wires attached (T1/1, T1/2, T1/3).
Clean out recesses with compressed air.
Clean and inspect ignition cables.
Remove spark plugs (R4).
Ignition Coil
94 - 99 S320 Tune-Up Instructions/Guide??-coil.jpg





INSTALLATION


Adjust spark plug gap to: 0.8 mm (0.031 in)
Install spark plugs and torque to: 25 - 30 Nm (18.5 - 22.1 ft.lb.)
Install ignition coils. Guide pin (W) must have good connection to chassis ground.
T1 = Ignition coil.
Ta = Terminal direct to spark plug.
Tb = Terminal to ignition wire.
W = Ignition coil ground.

Ignition Wire Schematic
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Don't assume ..... ,But know...

Last edited by symbolic95; 07-04-2008 at 11:09 AM.
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#8 (permalink) Old 07-04-2008, 12:22 PM
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I'm probably going to do this tomorrow, but i hesitated before buying spark plugs because i want to make sure i'm getting the best...

I was looking at Platinum 2's by Bosch but they have other plugs like Platinum +4 and the "Ir Fusion"...

What is the best plug to use? I am not looking for fuel economy, but the best possible spark/combustion possible.

Matt

1996 C220... aww yeah, base model!
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#9 (permalink) Old 07-04-2008, 01:37 PM
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look at the post vvee12 did,when he had his plug thread stripped ,there is discussion of the plugs. I was suggested to use only plugs that were designed for your engine - single electrode and i think it was copper.

Don't assume ..... ,But know...
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#10 (permalink) Old 07-04-2008, 01:58 PM
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Quote:
Originally Posted by symbolic95 View Post
Ok this diagrams for you.I'm at work right now,if you need more info,let me know il'll snap some pictures.

One thing when you will be installing new plugs ,get yourself rubber hose that fits on the top of the plug( i got one from Autozone $1,ask for a rubber hose,about 10".)
It is for "threading" the plug,this way you will go gentle and wont ruin the thread in the head,i also use gray anti seez paste .
Attachment 185206
And one more, watch that torque!!!


Service and Repair

PRECEDING WORK
Before removing the spark plugs, the Intake air cross pipe must be removed.
This component must be reinstalled after replacing the spark plugs.
Attachment 185201

Spark Plug Replacement




REMOVAL


Turn ignition OFF.
Unclip cable duct (12).
Remove cable duct cover (5/1).
Remove guide rail (5/2).
Remove spark plug connectors (arrow).
Remove ignition coils with wires attached (T1/1, T1/2, T1/3).
Clean out recesses with compressed air.
Clean and inspect ignition cables.
Remove spark plugs (R4).
Ignition Coil
Attachment 185202





INSTALLATION


Adjust spark plug gap to: 0.8 mm (0.031 in)
Install spark plugs and torque to: 25 - 30 Nm (18.5 - 22.1 ft.lb.)
Install ignition coils. Guide pin (W) must have good connection to chassis ground.
T1 = Ignition coil.
Ta = Terminal direct to spark plug.
Tb = Terminal to ignition wire.
W = Ignition coil ground.

Ignition Wire Schematic
Attachment 185203

Great Job, Symbolic! When you remove the spark plug connectors, do you just pull them up with force via hand? Also, is there a Distributor Cap & Rotor ?? Autozone said for a '94 S320..... NO.

Last edited by BigBruce; 07-04-2008 at 02:09 PM.
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