valve lifters

[mr rosher]

hi` everyone, can anyone tell me the correct ,maximum clearance between cam lobe and valve lifter on an 1993 E280 D O H C, as i cant seem to find it in the haynes manual, and is there a differance between (inlet & exha) cheers rod

 

[type49]

They're hydrolic. Don't touch them.

 

[C220GJS]

Hi,
As type49 says your valve lifters are hydraulic and are not adjustable , they are completely self adjusting, what is your problem ?

 

[mr rosher]

hi` george, sorry did`nt explain myself properely, i have had to change my exhaust cam shaft with a second hand one from the breakers as mine snapped on reasembley of a strip down i have just completed, so i need to know the maximum clearance as to know what size shimms to buy and replace as ive been told i need to do this when you change cam shafts,

cheers rod,

 

[C220GJS]

There are no shims between the hydraulic cam followers and the camshaft on these engines. When you start the engine after a rebuild it will rattle like a bag of spanners for a couple of minutes until the oil pressure pumps up the cam followers then it will quieten and smooth out, just allow it to tick over until this happens and check for oil leaks to occupy yourself.
See here;http://www.detali.ru/cat/oem_mb2.as...GM=717.440&CT=M&cat=520&SID=05&SGR=060&SGN=02
This is your valve set up,as you can see there are no shims listed.

 

[mr rosher]

thanks george for the info, ive had her running starts first time every time and sounds great, she drives lovely ,but when your about 2800-3000 rpm you get a small rattle,when she`s on about 3500-4000 rpm its louder, then if you go higher then 4500 rpm seems to get better again any thoughts, this is where the idear came from that it was the shimms, do you think i may need a complete new set of lifters for both cams and if so any idear of the cost im looking at,

 

[C220GJS]

If the noise comes and goes as you say it is not the cam followers as the noise from worn followers would be apparent throughout the rev range of your engine.
The only thing I can think of that would cause your symptoms is a faulty camshaft adjuster, see here ;http://www.detali.ru/cat/oem_mb2.as...GM=717.440&CT=M&cat=520&SID=05&SGR=015&SGN=01.
Was it reassembled correctly when rebuilding the head and is the electromagnetic servo unit at the front connected ?, let me know how you get on.

 

[eric242340]

In addition to the reply by George, when you had the engine appart, did you submerge the cam followers in oil or did you let them sit. If the old cam followers were allowed to sit, all the old oil drains from them. And after because of the old oil problems, some of them may not accept new oil. partial blockages, rubberizing, to name just two. Also how much wear was there on the camshafts.
Now the big question, have you checked the oil pressure? I would be interested in your reply thanks eric,

 

[mr rosher]

hi eric, the old cam followers were submerged in oil on removal and the wear seemed to be ok as does the oil pressure,my problem lays with the camshaft adjustment as i did`nt reset it, i went by the marks i made on the cams & crank once i had TDC, since georges advise i have striped her back down to start again, the thing is in the haynes manual it states once you have TDC on cams & crank to rotate the adjustment mechanism by hand clockwise as far as stop, but in a timing book which i lent from the local garage its got ensure camshaft adjuster lugs in retarded position, can you help with this as im cofused, do i go clockwise or anticlockwise with the adjuster ?,

rod.

 

[C220GJS]

The camshaft adjuster on my engine is different but this thread from another forum states the adjuster should be turned in a clockwise direction for correct assembly.http://www.mercedesshop.com/shopforum/showthread.php?t=164501&highlight=camshaft+adjuster.
I think both of the instructions you have are the same ; if the gear is turned fully clockwise that means the cam is running that angle retarded and if you turn the cam back you acheive the same result, hope you get what I mean.

 

[mr rosher]

thanks george, i will go with the haynes manual then clockwise,

rod,

 

[C220GJS]

Rod,
Thinking about it logically that is the only way to go as the inlet cam is then in its furthest retarded position and as the cam adjuster comes in it advances the inlet cam which is what is required at higher revs. Took me a while to get my head around how it works.

 

[mr rosher]

thanks george much appreciated, i should of done this first time round but did`nt realize how much difference it would make as never deaing with this sort of timing before, thanks again,