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Old 02-02-2003, 09:20 AM
BlackBeauty's Avatar
Join Date: Feb 2003
Location: South East Asia
Posts: 125
Project 300CE

This is a great Mercedes resource forum!! I got a 300CE (M103 engine) and I hope to restore it to prestine condition. The slush box has just been overhauled by the stealership.

Engine runs and pulls strong but burns oil so I'm going to attempt to do a head job by myself and at the same time maximize try to extract some power from the engine. Also, at 3500 rpm and up, I hear some lifter sound / ticking noise...

I have done a SEARCH and gathered some informative pointers but here are some more questions:

1. Other than Valve Guides, Valve Stem Seals, Valves, Head Gasket Kit, Timing Chain, Chain tensioner, what else do I need to purchase?

2. I'm aiming to do some performance upgrades at the same time. I will probably polish the intake/exhaust part and do a 3 angle valve job. Is this procedure recommended. I know its not essential but since its out, no harm trying to extract the last bit of bhp.

3. My friend has advised me to skim the cylinder head. How much is enough or too much?

4. I checked with Bekkers on the GTC sport camshaft but they do not offer this item anymore. Are there other manufacturers for this?

5. Any other input on the above valve would be appreciated

6. Since we are at it, any cheap ways of increasing bore + stroke if I would like to overhail the entire engine? Renntech and Brabus... they are too expensive.

7. I have already ordered 500E front and rear sway bars. It already has Eibachs + stock shocks. Can't wait...

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Old 02-02-2003, 10:28 PM
Registered User
Join Date: Sep 2001
Location: Austin, TX
Posts: 563
Performance questions are better handled in the "Performance Paddock" forum on this site.

I believe the consensus here would be to replace the valve stem seals, but you don't need to remove the head on your M103 engine to do that.
Mike Heath
1988 560SL Black/Palomino
1988 300SEL Black Pearl/Burgandy
1984 500SEC Anthracite Grey/Palomino
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Old 02-04-2003, 08:51 AM
BlackBeauty's Avatar
Join Date: Feb 2003
Location: South East Asia
Posts: 125

Thought it was technically related somewhat...

Any more inputs from other members would be greatly appreciated and thanks in advance.
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Old 02-04-2003, 01:14 PM
sixto's Avatar
smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 18,745
Don't forget timing chain guides while you're at it.

Look in the parts forum. There's a C36 engine for sale. A long time member installed such an engine in his 300TE with great results. I'm sure he'll be willing to pass on his experience.

At the very least compare the cost of hopping up an M103 with swapping in an M104. I think it'll cost less in parts, labor and analgesic to go with the M104.

91 300SE
87 300SDL
83 300SD
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