M116.980 Engine (Variations between Camshaft Part Numbers)

[Jazzenco]

Hi Everybody,

I have 1971 w108 280SE 3.5 with M116.980 early D-Jet Euro engine and I have some questions regarding to variations of camshafts(series) used in early m116 3.5 engines. So, I would like to ask, Are there any differences between camshafts 1160513001 left side(3101 right) and 1160514601/4701? On my car 3001/3101 used. I asked this question, because I have spare cylinder heads removed from M116.982 early 350SLC which has 4601/4701 cams on and perfect condition. I'm currently rebuilding engine and I want to use this cams. Just want to know, this cams are same, or degrees are different? If same Why numbers are different?..


Best Regards,

Kutluhan

[Frank Reiner]

The 30/31 pair and the 46/47 pair have the same opening and and closing points as shown in the factory manuals. What is not shown in the manuals is any information about lift or profile.
A few measurements around the lobes will reveal relative lift differences, if any.

[Tomguy]

Kutluhan,
There are numbers actually stamped on the back face of the cam and these are what most of us use to refer to cams (ex 52/53, 46/47 etc). MB used different part numbers over production runs, but those numbers always referred to the cam type and its timing.

See the attached PDF for full cam info.

[Jazzenco]

Thank you very much Tomguy and Frank for replies and detailed information. Information you gave really very useful for me, specially this pdf file that shows camshaft specifications was what I was looking for. Thank you very much Tomguy for sharing. I think since first m116.981/80 3.5 launched in 1969/1970 till mid 70's together with other 3.5's early 4.5's,MB modified engines and during production replaced some part numbers for following m116/117 engines.

By the way, today I opened my spare cylinder heads which were removed from m116.982 350SLC and checked camshafts again. Just one more question, on right cylinder head camshaft, there is a metal projection, do you know what is it about? For balancing? Please checked attached pictures..

Best Regards,

Kutluhan

[Tomguy]

Not 100% sure if the 46 you're showing is the cam ID - though it'd match with an early 3.5 part number. The other "Projection" is probably for balancing, it's not functional.

http://www.peachparts.com/shopforum/vintage-mercedes/86694-these-cam-codes.html

[Jazzenco]

Hi Tomguy,

I checked your earlier thread regarding to camshaft series.I know this. You mentioned before. This cams have 52/53 stamped on rear end rollers. Which was removed from my car are 46/47 stamped rear ends. Do you think any performance difference between this cams?Such as 52/53 lower than 46/47? or same

Regards,

[Tomguy]

According to MB, they're the same.

[Jazzenco]

Thank you very much Tomguy for all detailed information.