M103 91 300SE water pump replacement pics - PeachParts Mercedes-Benz Forum

sixto · #1 07-31-2003, 04:17 AM

I don't have a photo editing tool so I can't massage the file size so I can post the photos directly. I'll direct anyone who's interested to http://www.peachparts.com/Wikka/M103WaterPump.

Photo 1 -- the tools I used to remove the water pump: 3/8" ratchet with 6" extension, 3" extension and deep 13mm socket; 1/4" breaker bar with 6" extension, u-joint and 13mm socket. Not shown are a 13mm box wrench and 5mm allen key. Also not shown are the tools needed to remove the serpentine belt, clutch fan, various pulleys, belt tensioner, radiator hoses, thermostat and heater pipe. Other things I don't remember as well.

Photo 2 -- 1/4" socket wrench in action on the rear upper bolt. Viewed from the rear of the engine looking forward. Idle air valve is removed from its mounts but the connections are in place. Dipstick is removed so I can start the bolt by hand.

Photo 3 -- 3/8" socket wrench in action on the rear lower bolt. Viewed from the front of the engine looking back. The water pump hides the 3" extension and 13mm deep socket. It's a straight shot. Nothing fancy. I used a magnetic pick-up tool to set the bolt in place.

Photo 4 -- Green coolant fill in June 2000 just before I got the car. The head surprisingly looked better. I don't know what it looked like in June 2000. I wish I had descaled it before all the work I just did. It didn't look that bad when I pulled the pump. I scrubbed the orange area with a wire brush then let it sit for a week for an opportunity to continue working before taking this photo.

Photo 5 -- fan clutch tool set - 3/8" breaker bar, 10mm deep socket, 8mm allen key. My car has a two-piece shroud so it's off the car. A one-piece shroud would be draped over the fan. Does a 300E have this much clearance between the fan and the radiator? I couldn't get a good shot of the keyway behind the fan pulley. As it is with my car, I can hold the pulley enough to loosen the fan bolt by pulling or pushing on the belt. With the fan and heater pipe out of the way, it's much easier to slip the locking key (piece of stiff wire) into place to remove the four pulley bolts. I forgot to take a picture of the keyway before attaching the heater pipe.

Photo 6 -- Feeble attempt to show the serpentine belt tensioner scale. It's just to the right of the lower radiator hose clamp bolt. The wide end of the ramp section is clear. The gap and tall section are obscured by the shadow. The pointer is set to the middle of the gap. FWIW, I find it much easier to get the belt in place by releasing the top moung of the tensioner shock. The long hollow nut that takes a 13mm socket is part of the tensioner adjustment mechanism. CW increases tension, CCW drecreases tension. Yes, I'm going to clean the power steering fluid reservoir cap.

I couldn't get a good shot of the 19mm bolt that goes through the tensioner.

Sixto
95 S420
91 300SE
87 300SDL
83 300SD

1991300SEL · #2 07-31-2003, 05:31 AM

Sixto:

Nice job - thanks for taking the time.

wbain5280 · #3 01-07-2004, 05:33 AM

I'm doing this job now. Yes, I did a search and printed out some of the posts. All I can say, this job is a real PITA!

So far, I've got the radiator out, fan blades off and serp belt off. So far, I can't get to the lower front bolt. I guess I'll have to take the tensioner off as well.

Which reminds me, if anything could be more complex that the serp belt tensioner, I can't imagine.

I got some more tools last night, 1/4" stuff, and I'll give it a stab in the morning.

BTW, it's really cold this week. Luckily, my 300SE is my toy.

I e-mailed Mr. Sixto yesterday and he kindly gave me some advice.

I also noticed the cap, rotor and wires need to be replaced.

I'm spending too much money on this car already.

wbain5280 · #4 01-07-2004, 12:43 PM

I've got the water pump out.

I was not able to get the fan drive off. I had to undo the tensioner bits and the PS pump. The tensioner is out of the way but because I couldn't get the bolt that holds the bracket to the block, I had to wiggle the tensioner out of the way. The bottom bolt was revealed and loosened. The top rear bolt broke my SEARS 1/4" u-joint so I had to use the 3/8" drive, u-joint and 13mm socket. I don't know if the pump is the original one, but the bolts were really tight. BTW, it's an MB water pump. I'm using an aftermarket one.

This design really is crappy. On my departed Fintails, at least you could get to everything. The layout was good and everything could be easily serviced. Not so the M103. I bet the V-8's are worse though.

So tomorrow I'll attack the installation, after I help my father with his PC. Maybe I'll do it the day after.

I need a shower and a rest.

TTFN

Jim Anderson · #5 01-07-2004, 02:03 PM

I think the first two pieces Mercedes put together when they assembeled the car was the engine block and the water pump!

Peugeot mounts the water pump on the front of the cylinder head, you could change the pump wearing a tuxedo.

psfred · #6 01-07-2004, 02:09 PM

Without the PS pump, it's a peice of cake. With, a big PITA. Took me exactly 6 hours.

Peter

unkl300d · #7 01-02-2008, 08:32 PM

Sixto, did you move your photo files out of the now-defunct- yahoo photos?

Please post a new link if you did.

Thanks for your water pump thread !!!!