W203E35

Hey guys,

I'm back with another problem

Yesterday I was heading onto the freeway onramp when I gunned my car and it felt sluggish. My friend asked me if I checked the oil level after the last visit to the dealer. So I checked the oil level today and approx I lost 1 quart.

I started to check for leaks, so far I have had 4 leaks.

Well I found a leak. Can someone be kind enough and tell me what the part is called and if it something serious?

Thank You,

Karo

P.S. The leak was a good amount. When I rubbed my finger below the area I got a good amount of oil. I can only imagine on the freeway

samaritrey

dam dude this sucks. wish i could help but i have no clue what that is. looks like you get another trip back to the dealer. wish my engine bay looked that clean

W203E35

Thanks Trey, yup I guss I have to take it in tomorrow. I already have had 3 leaks before.

Oil Breather was leaking
Rear Cam Plug was Leaking
Oil PCV Cover was Leaking

and now I have a leak from here.

No wonder I thought I was consuming oil. Soo many leaks (i'm not saying i'm 100% sure I am not consuming oil).

W203E35

Ahh found out what it is.

It's the "Rear Main Seal" (Number 33)



1) CYLINDER BLOCK
2) CYLINDER HEAD
3) HEAD GASKET
4) FRONT COVER
5) INTAKE VALVE
6) EXHAUST VALVE
7) VALVE SPRING SEATS
8) VALVE SEALS
9) VALVE SPRINGS
10) VALVE SPRING RETAINERS
11) VALVE KEEPER
12) ROCKER ARMS
13) VALVE LIFTERS
14) ROCKER SHAFT
15) CAMSHAFT
16) TIMING GEAR SET
17) ADJUSTER
18) VALVE
19) TIMING CHAIN
20) TENSIONER
21) CHAIN GUIDE
22) TIMING COVER
23) BALANCE SHAFT
24) WEIGHT
25) PISTON RINGS
26) PISTON
27) CONNECTING ROD
28) BEARINGS
29) FRONT CRANK SEAL
30) BEARINGS
31) THRUST WASHER
32) CRANKSHAFT
33) REAR MAIN SEAL
34) REAR MAIN SEAL RETAINER
35) PULLEY 36) OIL PAN
37) OIL PUMP
38) CHAIN
39) TENSIONER ARM

laneshift

Hopefully it's the last leak you'll have!

W203E35

Thanks , I really hope so too. I just checked my paperwork warranty ends on the 20th .

I think it's time to get Johnnie Walker Blue Label and go see my Service Advisor

LILBENZ230

Rear main seal leaks are fairly common, I thought.

acr2001

Wow, how is your engine bay so clean?! The metal doesn't even look oxidized! Granted, my car is a year older, but still!

LILBENZ230

My engine bay looks like that as well, and mine is an 05.

johnand

That can't be the rear main seal. That can't be seen, because it is between the crankshaft output, and transmission input. You would see that leak commonly right at the split where the transmission and engine meet on the very bottom of the engine. What that is in your pics, I am not sure, let me do some digging.

johnand

Ok, I looked on EPC net, and that is an expansion plug for a vacuum pump that is no longer applicable, so it is just that, a plug. In the notes it states: See DTB S-B-01.30/23a regarding oil seepage from back of cylinder head. Check you STAR service manual and see what it says.

johnand

Did someone say Blue Label!!!!!!!!!! I am suddenly VERY thirsty

W203E35

Maybe it's the weather? SoCal is pretty dry maybe this is the reason it doesn't look oxidized?


Thanks, I'm going to try to reinstall EPC and WIS (upgraded to windows 7 hope it works)


Whenever you come down to SoCal I got some Blue Label for you

johnand

It works in Windows 7, I am running it at home. on the Blue Label offer.

W203E35

Yup, You're right it does work.

Blue Label -FTW

acr2001

^me

That explains it! The salt here is pretty harsh.

W203E35

Good news. Nothing major, I took it to the dealer and they said it was the cam plugs. The cam plugs had previously been leaking and I guess the dealer didn't fix it well the first time.