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  #1  
Old 25th June 2008, 03:42 AM
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Default Valve Grind & De-coke on 6.9

Well, it's been coming for quite a long time - too much Oil and Water mixed together make for a nice coloured Caramel combination, but it's not the best application for a well lubricated engine.

I knew it was time when, within 21 kilometers and overnight, 12 litres of fresh oil decided to go 'creamy'. It also got to the stage where too much of the clear stuff in No. 4 cylinder prevented the Starter Motor from turning over the engine. I have always believed in 'Gleaming Beauty' telling me when it was time for rectification work and clearly that time had arrived. No good kidding yourself -this was for real.




There were several factors that were instrumental in mine not carrying out this work earlier. Firstly, you have to decide whether or not to remove the engine from the car, as it would be far easier to get to all components. However, I was not in favour of that idea on account of:

a) Difficulty in removing A/C compressor, and
b) The three oil lines connecting the oil tank to the small sump.

Time was also a real problem, plus I lacked the confidence required in tackling work of this magnitude. In addition, I had no spare head gaskets to have some made up locally on account of the cost of the item from Mercedes. This last named was kindly solved for me by Anthony (abl567) who procured the gaskets for me from Tom Hansen in the states. Thanks Anthony - you're a champ. So on with job. Regards Styria
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Old 25th June 2008, 04:14 AM
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Default Re: Valve Grind & De-coke on 6.9

Okay. I am not going to bore you with a 'blow by blow' description or details of 'removal procedures'. Most of it is self explanatory - in other words, you need to remove a fair number of components before you get to the 'nitty gritty' - i.e. removing the heads.

It was at this stage that "Lady Luck" arrived in the shape of Mercules, who offered to help with the job. I won't go into the finer details, but his offer was God's help sent. Thus, by 6.30 am I had drained the cooling system, parked the car in the shed with suspension in the 'locked' position, and drained the oil from the small sump and the oil reservoir - with the last named, I had to poke a screw driver through some gunky, but hard caked substance before any oil drained out. Let me tell you, it was such a good feeling to drain out all this 'diabolical mixture'.

"Lady Luck" arrived at about 9.30 am, and by that time I had removed the radiator and hoses, most of the inlet manifold, rocker covers etc. etc. - unfortunately, one of the bolts retaining the manifold broke in the head, but that was half expected. Okay, time for some pics.














The last gesture by Lady Luck is the victory sign - at long last, heads off - if I remember the correct sequence of photos and work carried out.



...and this is the top of the "Engine Room"..



All in all, the first head was off by about 1.30 pm, and the second unit (after much grunting, cursing etc.), was off by about 6.30..7.00..can't quite remember. Regards Styria

Last edited by Styria; 27th September 2012 at 05:35 AM.
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Old 25th June 2008, 04:29 AM
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Default Re: Valve Grind & De-coke on 6.9

Right, the stuff you see in the picture below is what was 'shovelled up' from the 'V' location in the motor. The Roller as featured in this newspaper clipping is purely co-incidental. Honest !





Now, I should stress that after Cameron's arrival, he really took over, and I was relegated to cleaning duties of components removed. As I said, we finished about 7 pm, and I spent virtually all my time cleaning. In fact, I came back the following morning for further cleaning and sorting - for another four hours.















[IMG]http://i233.photobucket.com/albums/ee123/styria_01/gearboxmodelnumbers378.jpg[/IMG

RECONDITIONED HEADS (on hand) IN READINESS.



That's all for now, folks. More to come, plus observations, in due course. Regards Styria

Last edited by Styria; 27th September 2012 at 05:37 AM.
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Old 25th June 2008, 06:43 AM
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Default Re: Valve Grind & De-coke on 6.9

Hi guys, for anyone contemplating the removal of heads on a RIGHT HAND drive car, I would suggest the following:

1) Removal of the Brake Booster should be almost mandatory. This is in order to gain easier access to the head retaining bolts on the lower part of the right hand head.

2) I have the advantage of having split my engine down pipes by the fitment of flanges - when the time comes for re-assembly, this is going to be quite important.

3) Remove heads with exhaust manifolds attached - I tend to think it would be just about impossible to remove the manifolds with heads still attached to the engine block - even if it could be done, your back and arms would certainly know about it.

4) It is also advisable, more than likely necessary, to place the lower studs into position PRIOR to re-attaching the exhaust manifolds to the heads.

5) When the time comes for re-assembly, I will be using my engine lifting hoist to lower the heads into place - any other way, and it will just about break your back, or you're likely to damage any number of components, especially the head gaskets.


With heads removed, much easier access can be gained to a number of components, such as Steering Box and coupling, Engine mounts and the small stabilizers, and it also gives you the opportunity to have a proper clean-up of the Engine Bay in general. So far, about thirty hours have been spent on this job. In addition, I have used about ten litres of Kerosene in degreasing the engine bay, pressure cleaning the timing chain area (internal) and the small sump by removing the sump plug, filling up the sump cavity and remote oil tank with kerose and petrol and blowing it all out with compressed air. "Gleaming Beauty's" internals should be just about as spotless as one can achieve under the circumstances. More pics. and info to follow in due course. Regards Styria
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  #5  
Old 25th June 2008, 06:47 AM
BenzBoy BenzBoy is offline
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Default Re: Valve Grind & De-coke on 6.9

Good to see you had the Flying Doctor to help out there!!!
Regards,
BenzBoy
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Old 25th June 2008, 08:02 AM
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Default Re: Valve Grind & De-coke on 6.9

I understand now why you have been so quiet lately (in my neck of the woods)...

Glad to see you had some serious help ...

Looks forward to seeing you 'mobile' in the GB again...
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  #7  
Old 25th June 2008, 01:48 PM
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Default Re: Valve Grind & De-coke on 6.9

THankyou for the pictures Styria - what a brilliant collection of photos.

Was it a head gasket leak or is it a crack in one of the heads?

Bill
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Old 25th June 2008, 05:29 PM
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Default Re: Valve Grind & De-coke on 6.9

I'm reading this from work where I can't see the pictures (blocked by the firewall). But I can picture in my mind from the descriptions.

All I can say is well done for taking on such a big task. Guess there was no choice though.... I 'm glad to hear its progressing well though. I would be curious to know the root cause of the problem. Over on the M100 group there has been off and on some talk of the tendency for 6.9 head bolts to slowly work loose as a result of heat-soak from the exhaust manifolds. I gather this would afflict cars used as daily drivers more than those used only for occasional long trips.

I'm looking forward to seein this thread from home this evening, where I will be able to see the photos.
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'80 W116 280SE euro - the ride
'76 W116 6.9 euro - trusty rusty
'78 W116 6.9 euro - the AMG
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Old 25th June 2008, 09:11 PM
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Default Re: Valve Grind & De-coke on 6.9

Quote:
Originally Posted by Styria View Post
Whilst this may appear to be a jovial "Victory" symbol (Winston Churchill style) it is acutally "up yours" becasue the right side cylinder head fought us all the way - the head was loose and ready to come off but the exhaust manifold would not come past the steering box - it had to be unbolted in situe and let me tell you, the manifold nuts are extremely hard to remove!!! You ain't heard swearing till you heard me trying to get this head off... would have made a truckie's mother blush!

No doubt, this is one of the most complicated mechanical repairs I have ever undertaken - whilst every engine was fitted fully assembled during manufacturing, the 6.9 is so large and tight in design it almost defies logic to dissasemble the motor while its still in the car!!!

I have learnt a great deal from pulling this car apart and I'm looking forward to torquing up the head bolts and hearing it start again... but would just like to warn anyone contimplating this job themselves - this is a job that requires special tools, experience and patience - lucky Styria and I have the tools...
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Old 25th June 2008, 09:13 PM
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Default Re: Valve Grind & De-coke on 6.9

Great pictorial Styria!! And all I can say is you're a lucky man to have the Merculian Mercules helping you with this job! Is there gonna be any 'upgrades' at the time of this reco? ..you know, while you're there.....

It also scares me seeing the result of these sort of occurences, makes me wonder how far away this 'maintenance' is for a 30yr old m117.
I gotta ask too, was it the heads or just the gasket??
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Old 25th June 2008, 09:17 PM
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Default Re: Valve Grind & De-coke on 6.9

Quote:
Originally Posted by Mercules View Post
Whilst this may appear to be a jovial "Victory" symbol (Winston Churchill style) it is acutally "up yours" becasue the right side cylinder head fought us all the way - the head was loose and ready to come off but the exhaust manifold would not come past the steering box - it had to be unbolted in situe and let me tell you, the manifold nuts are extremely hard to remove!!! You ain't heard swearing till you heard me trying to get this head off... would have made a truckie's mother blush!

No doubt, this is one of the most complicated mechanical repairs I have ever undertaken - whilst every engine was fitted fully assembled during manufacturing, the 6.9 is so large and tight in design it almost defies logic to dissasemble the motor while its still in the car!!!

I have learnt a great deal from pulling this car apart and I'm looking forward to torquing up the head bolts and hearing it start again... but would just like to warn anyone contimplating this job themselves - this is a job that requires special tools, experience and patience - lucky Styria and I have the tools...

Torana68 (Roger) from the 'other site' undertook this job on his M117 450... obviously no comparison in tight fit compared to the 417 M100 block!! However, he did say that the rear bolts, especially on the drivers side require a special "stair" shaped? cap screw tool. Like a bent allen key?
Is that what was used??

Also what other special tools were required?
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Old 25th June 2008, 09:36 PM
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Default Re: Valve Grind & De-coke on 6.9

Really Mike... Lady Luck? (must have been my Hard Yakka skirt )

My version of the day's timeline...
  • 11:30 - Mike had the rocker covers off, top dissassembled, oil drained and radiator out - I arrived late after a little sleep in and some home duties
  • 13:30 - Injection off, starting on the manifold then we stopped for lunch
  • 16:00 - Manifold off
  • 16:45 - Left side cylinder head removed - mandatory coffee break
  • 19:00 - The fight ended and the right side cylinder head was defeated

Twas 45 minutes to remove the left head but over 2 hours to remove the right head Aaarrgh it was a killer!

Special tools Cam?
10mm allen key sockets in about 5 different lengths and one custom made version Crows feet 10 different lengths of 1/4 drive extensions + short & deep sockets a mallet metre-long breaker bar 9" population tool Some extreme tolerance for pain strong forearms an extensive vocabulary in the disciplines of insults, disgust and cursing
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Old 25th June 2008, 10:07 PM
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Default Re: Valve Grind & De-coke on 6.9

Quote:
Originally Posted by Mercules View Post
9" population tool
Is this Australian popular vocab for a particular tool? I've never heard this term before.
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'80 W116 280SE euro - the ride
'76 W116 6.9 euro - trusty rusty
'78 W116 6.9 euro - the AMG
'74 W116 350SE euro - the stand-in ride
'82 W126 500SEL euro - full hydraulics - the limo
'83 FORD XR3 - the beast

0 benzes on stands, 5 RUNNING
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Old 25th June 2008, 10:16 PM
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Default Re: Valve Grind & De-coke on 6.9

HAhaha... great list of tools Cam. I'm guessing it was the extensive vocab that did the trick!
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1979 W116 - 450 SE 6.9 - New Ticker
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  #15  
Old 25th June 2008, 10:49 PM
Mercules Mercules is offline
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Default Re: Valve Grind & De-coke on 6.9

It is a time honoured tradition for a mechanic to send the dopey apprentice/work experience kid off the the parts shop for a left-handed screwdriver, a box of blue grinding sparks and a 9" population tool - hahahaaaa

So what is a population tool? I think it bears some resemblance to the trouser snake or the lamb cannon
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Last edited by Mercules; 25th June 2008 at 10:57 PM.
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