M110 280 motor

[Terqel]

hi all,
can someone tell me please if you can adjust the valve clearance on the M110 280 motor.
I have noisy tappets and given that it is an twin OHC configuration I have reservations.
many thanks

 

[Oversize]

Sure can! You'll need a special 17mm spanner so you don't dislodge the rocker retainer spring. I used to do this all the time when I worked for MB, but it was a long time ago.... I'd either adjust them when the engine was hot, or stone cold (overnight) & I'd use a jump lead to spin the engines so the rocker arms were positioned correctly. I think they were set to 0.04mm (inlet) & 0.10mm (exhaust) when hot from memory. Be very carefull you don't round off the adjusting nuts, because they can be tight, the hexes are narrow & they'll be covered in hot oil!

 

[Styria]

Hi Mark, am I correct in assuming that the special spanner you refer to is in fact a Medrcedes Benz tool ? Or alternatively, could it be purchased from an outside supplier, such as Snap-On or Stahlwille ?

Terquel, without that spanner, you're not in the hunt ! Getting back to Mark (Oversize), I have always been under the impression that tappet clearances were adjusted with engine stone cold - that's how I have always carried out adjustments on the M100 (6.3) engines. You might have some thoughts on this subject matter. Regards Styria

 

[Terqel]

thanks for the info, I feel better now. I will follow up on the special 17mm spanner and give it a go.
regards

 

[Oversize]

Hi guys, we had settings for hot n cold. It's obviously not practical to only have cold settings if you're required to service a car & it's just driven off the street. It was pretty rare to keep them overnight unless things got more involved. I was careful to make sure the engines were one, or the other & nothing in-between. If I was setting them hot, I'd make sure everything was ready to go & I'd even pre-dissasemble some components if I could, to allow me to remove the rocker cover/s quickly. I think the settings were 0.06mm / 0.10mm hot & 0.04mm / 0.10mm cold. The larger clearances were for the exhaust. Yes I believe the spanner was available through Stahlwille; I'm sure it'd be far cheaper than the MB equivalent. Then again unless you're a dealer I doubt MB would sell you one.

 

[Oversize]

BTW I found it much better to adjust them cold as you didn't have to worry about the engine cooling down and more importantly, you didn't burn yourself!

 

[Styria]

...good thinking Number 1. Rocker covers on 6.3s aren't the easiest to remove, especially the one on the passenger (left) side - again, you have to ask yourself why the Company couldn't have put a little more foresight into planning disassembly procedures - you know, the large bracket that holds the coil, the metal breather pipes for the two rocker covers, the high tension leads.......I am sure you know all about it. Regards Styria

....oh, I forgot the Air Con hoses !