Water pump fan bolt and vicious clutch - Mercedes-Benz Forum
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post #1 of 14 (permalink) Old 06-11-2019, 07:28 PM Thread Starter
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Water pump fan bolt and vicious clutch

Hi fellow Merc lovers.
I have 1990 W126 300 SE
I need to chance vicious fan clutch, but the Allen head of the bolt is gone.
So my question is...do anyone know what thread that bolt has?
So I colud pre buy it before I take aux fans and radiator off to drill the bolt out and replace clutch and the bolt.
Also, maybe someoknows some tips or tricks to make it as painless as possible.
Thank you
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post #2 of 14 (permalink) Old 06-11-2019, 09:00 PM
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Please complete your profile - where upon this planet do you reside? It does help us help you (you might be just down the road from someone here).

Never have seen the fan held onto the water pump with allen head bolts? They've all been 10mm headed bolts. Are you asking about those four bolts?? Define "gone" - allen head stripped out or the round head of the allen bolt has broken off??

Don't remember the thread size for those but they're very common on the car, nothing special. Take one that came out to a Fastener Shop and they'll be able to match it easily.
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post #3 of 14 (permalink) Old 06-11-2019, 09:05 PM
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Quote:
Originally Posted by Eneli Aaving View Post
Hi fellow Merc lovers.
I have 1990 W126 300 SE
I need to chance vicious fan clutch, but the Allen head of the bolt is gone.
So my question is...do anyone know what thread that bolt has?
So I colud pre buy it before I take aux fans and radiator off to drill the bolt out and replace clutch and the bolt.
Also, maybe someoknows some tips or tricks to make it as painless as possible.
Thank you
You could just buy the replacement bolt from Mercedes?
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post #4 of 14 (permalink) Old 06-12-2019, 12:22 AM Thread Starter
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Originally Posted by mramay View Post
Please complete your profile - where upon this planet do you reside? It does help us help you (you might be just down the road from someone here).

Never have seen the fan held onto the water pump with allen head bolts? They've all been 10mm headed bolts. Are you asking about those four bolts?? Define "gone" - allen head stripped out or the round head of the allen bolt has broken off??

Don't remember the thread size for those but they're very common on the car, nothing special. Take one that came out to a Fastener Shop and they'll be able to match it easily.
Hi. Thank you for your time.
I am still learning to use this forum, trying yo update my details asap. I am located in Brisbane AUS.
So the Allen head is stripped out by someone. And I guess, I need to remove one middle bolt to get the cooling fan and the clutch out.
Probably MB shops would be good idea, but would like to know what they need to sell me. Otherwise I still might come home with the wrong bolt and I discover it when I can not drive anymore. Ps, picture of the bolt is from a YouTube video.
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post #5 of 14 (permalink) Old 06-12-2019, 01:15 AM
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The torque on those bolts is not very high. If you can reach the protruding head, a quality vise grip and use a pipe for leverage might help.
Even a thrashed vise grip is still cheaper than 1 hour at the mechanic shop. I happen to have HQ cobalt drill bits incl a set of 'Left Turn' drill bits.
Using those to drill a hole to use my easy out bits for broken and damaged bolts (beside R, I also have left turn easy outs), most of the time the bad bolt will already come out with drilling, as the bit is turning in the correct direction for removal.
US forum members can just go to one of the top stickies for the service manual, perhaps a UK, NZ or fellow Aussie member will post up the pm?
Cheers

Btw, the attachment shows hot to complete your profile.
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post #6 of 14 (permalink) Old 06-12-2019, 02:26 AM
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Bolt

The fan clutch bolt is not an allen wrench bit but a star torque bit . Was the right bit used to remove the bolt?? See picture . Mercedes part Number is 0000 0000 04 138 By the way yoiu will see 4 bolts at the rear of the unit these 4 bolts hold both bearing holder and fan clutch .Should be easy to remove the whole item bearing and fan clutch in one , once you remove these 4 bolots . Look on you tube video to see how its done.
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post #7 of 14 (permalink) Old 06-12-2019, 02:40 AM
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fan

As i was saying this is the layout of the 4 bolts in question. And remember if you remove fan blades it must only go on one way or it will blow air out from the engine and not draw it in to cool the radiator.
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post #8 of 14 (permalink) Old 06-12-2019, 05:31 AM Thread Starter
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Originally Posted by plinker17722 View Post
The fan clutch bolt is not an allen wrench bit but a star torque bit . Was the right bit used to remove the bolt?? See picture . Mercedes part Number is 0000 0000 04 138 By the way yoiu will see 4 bolts at the rear of the unit these 4 bolts hold both bearing holder and fan clutch .Should be easy to remove the whole item bearing and fan clutch in one , once you remove these 4 bolots . Look on you tube video to see how its done.
Thank you. I will definitely look into those 4 bolt more carefully.
I think so far everyone has assumed that it is an Allen key, I'll try torque as well. Thank you for the part number. I'll try to call into few MB stores now whwn I have bit more of information.
I've added sample of the one YouTube video where it is suggested that it is Allen key, have found some misleading information then 😕
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post #9 of 14 (permalink) Old 06-13-2019, 01:42 AM
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In my 300SE (M103), it is indeed an allen key (originally anyway); I think the picture above is from a V8 motor. You will also need the tool to hold the pulley in place.
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post #10 of 14 (permalink) Old 06-13-2019, 01:49 AM
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If you canot remove the centre bolt just remove the 4 bolts to get fan and bearing off in one then you can work on the torque head bolt removal when you have it on the bench.

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