Can anyone explain the proper cam, rockers and cam tower install and torque procedure and specs. Head is off engine. Searched threads- no luck.
Did valve job, new seals, hydraulic lifters etc. Just going back together with it. Thanks........

This should get you started:
http://www.w124-zone.com/downloads/MB%20CD/W124/w124CD1/Program/Engine/103/01-4150.pdf

And this...
http://www.w124-zone.com/articles.php?article_id=36

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I find it easier to bolt the head down first. The cam tower bolts go into soft threads which are easily stripped out. Having the head immobile on the block allows you better finesse when tightening those bolts.

Torque is either 16 or 18 ft/lbs, I don't recall ATM. I set my torque wrench and carefully feel as lightly torqing and quit if any feel as if they are beginning to pull the threads. If any feel really soft, plan to put heli-coils in all 4 as unbolting and rebolting a tower usually will get the ones that held torque when the first one failed.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff

Thanks ps2cho and duxthe1. Great info, but not an answer to my question. Is there a sequence to follow when installing and torquing cam towers. I have installed Timeserts in ALL 24 cam tower bolt holes. Ps2cho, the pdf you refer to does Not reference cam removal and or reinstall. Duxthe1, I tend to agree with you on first bolting head to block, but I still would like to know sequence and torque values. Anyone have any info on this and pros and cons on installing cam and towers with head off block as opposed to head on block. Thanks y'all........

ps2cho, my apologies. The 2nd link you provided did reference cam removal and install. My computer ( slow go dial-up ) just wouldn't take me in there the first time for some reason. No one else except duxthe1 wanted to chime in on this, so I tried a few more times and got in there. Really good site btw. I am a bit confused though. Heading the cam bearing/ rockers illustration, Torque reference is ( 21 Nm ). However in the printed instructions immediately following it says the torque should be 15 Nm. Which is it? Please see thumbnail. Am I missing something. I really don't want my head stripped again (hence the 24 Timeserts). Is the difference because of the two different type cam bearing bolts? Also, There is no mention of any particular sequence, so --- ges ther aint n e!! Anybody else ever installed a cam in an M103?

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There is no sequence per se. With the head off the engine (not my preferred method) you can turn the cam so that the lobes are pointing down for the tower you are currently tightening. That way spring pressure doesn't work against you. Otherwise it's just a straight forward job. 21NM is ~15ft/lbs so that was a misprint.

__________________

90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff

Thanks duxthe1, for clearing that up for me. Guess I'll get busy now.

For the rockers, tighten them such that it goes down evenly - i usually do opposites at a time. Once I feel resistance from the springs, I go one or half a turn on each bolt, until the rocker bottom out on the head and then torque each bolt to spec.

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Hi I know this a very old thread but I managed to strip 6 out of 24 can bearing bolts. Upon pulling them out they had the old thread inserts on the end of the bolt. Can I put another thread insert into the same bolt hole? The car is '88 300CE with m103.983 motor.