If you have a hot running W124 500E or any M119 Engine

[jaymanek]

And your car runs hotter than it should...

I posted this on the 500E board as its a very common issue.

Hi All,

The reason for my post is to thank the author this thread in the WIKI as it saved me so much time and hassle:

http://www.500eboard.com/forums/showwiki.php?title=Viscous_Fan_Clutch

I have owned my car since 2008 and it has given me very little trouble although always run a little hot for my liking... Previously I had already replaced the radiator, A/C Condensor & fan Switches and Fan Relays.

This summer the car started to run over 100 and would climb beyond in traffic so I decided to tackle the water pump, thermostat and viscous fan clutch in one hit...

Well the water pump was the most difficult... Of course the radiator, fan pulleys and water pump pulleys must be removed. Also the main crank pulley balancer has to be loosened off... Do not need to remove centre crank bolt but do need to remove the 13mm bolts to be able to loosen the vibration damper off, as the bottom water pump bolt cannot be removed otherwise...
There is a guy on benzworld that claims to have done it without removing this but I really cannot see how!

Its listed as a 4 hour job and it took me that and more to do

Also worth nothing that my "Vemo" fan clutch lasted less than 100 miles before it split and released gunk all over my engine bay... I was not happy... This has been returned and I have now fitted a Febi Bilstein part which I hope will last longer.

I think my root problem was the water pump as even with the broken fan clutch, i.e. with just the new water pump, the car sat at 80 degrees most of the time.

I used a genuine MB water pump...

Very satisfied now as its been something ive been wanting to get sorted for years.


Oh and I did the same job on my 300TE with the same results... Another model known for running too hot.. Seems the answer is that the water pumps just get inefficient with age.

 

[jaymanek]

For the M104 Engine... i,e, 300E, 300E-24, 300TE etc

Pelican Mercedes-Benz Tech Article - Removing Your Mercedes Benz Water Pump - 190E, W124, W126, W201, W123

 

[kth286]

For the M104 Engine... i,e, 300E, 300E-24, 300TE etc

Pelican Mercedes-Benz Tech Article - Removing Your Mercedes Benz Water Pump - 190E, W124, W126, W201, W123

Please DO NOT, I repeat DO NOT confuse the job he is doing, with the same job you might want to do on the twin camshaft 104 engines.

He is doing it on the 103 single camshaft engine and getting access to the 4 bolts on the twin cam engine is the most difficult part of the job, which is why the book time is 6 hours for the 104 engines.

You have to use very thin, quarter inch wobbly's for access to those 4 bolts
on the twin cam engine. The head is very much wider.

 

[Terry_]

Water pump on a 119 engine is a pig of a job!!!

 

[jaymanek]

Please DO NOT, I repeat DO NOT confuse the job he is doing, with the same job you might want to do on the twin camshaft 104 engines.

He is doing it on the 103 single camshaft engine and getting access to the 4 bolts on the twin cam engine is the most difficult part of the job, which is why the book time is 6 hours for the 104 engines.

You have to use very thin, quarter inch wobbly's for access to those 4 bolts
on the twin cam engine. The head is very much wider.

Yep that wasnt much fun! dropped lots of sockets!