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1989 300E (103) Definitive Water Pump R&R ... Done!
NOTE: I've updated this first post to include the discussions and experience/feedback that was given by kind people below as well as my own experience. The job was not bad (although definitely not a breeze), most of my time was taken by being unsure of what to do and how to do it since I didn't have a manual .... therefore if you're going to try this repair yourself (recomended) follow the steps immediately below :
I've perused this topic via various thread and have come across a bit of conflicting information. This is what I have found for anyone tempted to do this job themselfes. I don't think it is that difficult at all. I took my time over about a week of evenings (and a case of beer ![]() - no need to remove radiator at all, period. - no need to remove fan, clutch etc as some suggest, period. - in fact, no need to actually 'remove' anything except pulleys and air cleaner - remove the airfilter housing (2 screws and losen the vertical one on the side and remove the complete housing to give more working room. - the fan shroud needs to be losened by removing the two clips only, leave the shroud in place, removing the clips allow you to move the shroud over a tad so that ...... - ... you can losen the 19mm tensioner bolt just below the long adjusting nut - losen the long tensioner bolt to slacken the belt - remove ps pump and w pump pulleys (get a strap wrench) - remove the 19 mm bolt - unbolt the hex bolt fastening the dipstick to engine so that the dipstick can be moved a little to get better access to the 2 rear 13mm bolts hoding the waterpump (again, not critical but easy to do and helps to get access) - losen the heater pipe allen underneath the distributor and pull on the pipe to seperate from pump (replace washer) - undo all the bolts holding the ps pump and the tension/idler assembly - now you can start undoing the w pump (you will need extensions, universal and some tape to hold the universal straight, I did everything using 3/8"). Start by removing the front 6mm Allen bolt with an allen tool and a bit of pipe to get more leverage. ![]() - the lower rear 13mm bolt comes out easy with a 3/8 drive and extension ![]() - the upper rear 13mm bolt I found a lot trickier because of not very much room, but finally found that a combination of the smaller 1/4" drive to the bolt and then a 3/8" extension did the trick perfectly. ![]() - finally the lower front which is not bad to get at once you move the tensioner assembly out of the way. (note, I did 'not' remove any bolts from the engine itself (there is one into an oil passage to do with a casing that holds the tensioner), just enabled myself to move the round tensioner assembly an inch or so as well the ps pump is just pushed out of the way) - you are done. I did not use any grease with the o-ring as per dealer recomendation... it stays on well enough and wiggling tells you pretty quickly if it is sitting properly. - replace the 2" heater hose (even if it looks good, you won't get at it again) - reassemble everything in more or less reverse order. I did not worry about torquing in some kind of systematic way when mounting the w pump .... I mean, after all, it's heavy duty cast. I doubt it would make a difference like it does,eg, on a wheel. the little pointer on the tensioner came off - no big deal, it simply fits on losely and ratches (ie move it along with your finger) into position. - put the belt back on, tightened and filled with water ... tiny, tiny leak on the thermostat seal because I tried to reuse the old washer.... put in new washer - perfect. I tried to save new washer because I plan to exchange the plastic housing for a metal one. - cheers, guenter ps after you r&r the w pump ... should other items in this vicinity ever need replacement in future ..... it will be a breeze. Last edited by Guenter; 07-14-2005 at 10:05 AM. |
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