Loose Fan Assembly - Water Pump?
Thread Starter
Junior Member
Joined: Mar 2018
Posts: 28
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From: NorCal
2014 G63, 2008 G500, 2019 RS3
Loose Fan Assembly - Water Pump?
Hey guys, if there is a write up somewhere else for this, lmk and I’ll jump over there. Thx
2002 G500 80,000ish miles
have a “low coolant” warning light though engine stays cool enough and coolant even seems fine.
Started her up this morning and noticed a kind of squeaking/rattling sound. Popped the hood and noticed the radiator fan assembly seemed loose? Decided not to drive it and to diagnose further to decide wether or not to take it to an Indy shop or DIY.
Any info is appreciated 🙏🏼
gregoogle
I think this ICloud think should let you view the video:
https://share.icloud.com/photos/01cJ..._-_The_Village
2002 G500 80,000ish miles
have a “low coolant” warning light though engine stays cool enough and coolant even seems fine.
Started her up this morning and noticed a kind of squeaking/rattling sound. Popped the hood and noticed the radiator fan assembly seemed loose? Decided not to drive it and to diagnose further to decide wether or not to take it to an Indy shop or DIY.
Any info is appreciated 🙏🏼
gregoogle
I think this ICloud think should let you view the video:
https://share.icloud.com/photos/01cJ..._-_The_Village
MBWorld Fanatic!
Joined: Nov 2002
Posts: 1,028
Likes: 133
From: Massachusetts
2018 GLE350, 2014 G550, 2000 SL500, 1980 TR8, 1995 E320 Cabriolet
Either your fan clutch bearings or your water pump bearings are toast. My best guess would be the fan clutch bearings are the major culprit because with that much movement in the water pump bearing you would have water all over the place. As for the low coolant, the off-axis loads from the bad clutch bearings may have caused slight damage to the seal on the pump causing it to slowly leak coolant.
To R&R the clutch you will need a special fan clutch wrench (just a large, flat open end wrench) and a locking wrench. These are sold as kits on eBay and Amazon - buy a good one because the clutch nut is on tight! The fan clutch itself for the G version of the M113 engine is ridiculously expensive. I have not had to R&R the water pump itself, so I can't comment on what's involved there.
To R&R the clutch you will need a special fan clutch wrench (just a large, flat open end wrench) and a locking wrench. These are sold as kits on eBay and Amazon - buy a good one because the clutch nut is on tight! The fan clutch itself for the G version of the M113 engine is ridiculously expensive. I have not had to R&R the water pump itself, so I can't comment on what's involved there.
Thread Starter
Junior Member
Joined: Mar 2018
Posts: 28
Likes: 0
From: NorCal
2014 G63, 2008 G500, 2019 RS3
Either your fan clutch bearings or your water pump bearings are toast. My best guess would be the fan clutch bearings are the major culprit because with that much movement in the water pump bearing you would have water all over the place. As for the low coolant, the off-axis loads from the bad clutch bearings may have caused slight damage to the seal on the pump causing it to slowly leak coolant.
To R&R the clutch you will need a special fan clutch wrench (just a large, flat open end wrench) and a locking wrench. These are sold as kits on eBay and Amazon - buy a good one because the clutch nut is on tight! The fan clutch itself for the G version of the M113 engine is ridiculously expensive. I have not had to R&R the water pump itself, so I can't comment on what's involved there.
To R&R the clutch you will need a special fan clutch wrench (just a large, flat open end wrench) and a locking wrench. These are sold as kits on eBay and Amazon - buy a good one because the clutch nut is on tight! The fan clutch itself for the G version of the M113 engine is ridiculously expensive. I have not had to R&R the water pump itself, so I can't comment on what's involved there.
edit: what size fan clutch tool? 32mm? 36mm?
thanks again 👍🏼
Last edited by Gregoogle; Mar 8, 2020 at 12:23 PM.
MBWorld Fanatic!
Joined: Nov 2002
Posts: 1,028
Likes: 133
From: Massachusetts
2018 GLE350, 2014 G550, 2000 SL500, 1980 TR8, 1995 E320 Cabriolet
I would check on the size for you, but I am in the midst of moving and all of my tools are packed. I do know that the wrench that came in the kit splayed out so I ended up grinding down a regular open end wrench to make it thin enough to use to get the nut off. Don't go with a no name aftermarket fan clutch - get either genuine Benz or Sachs clutches. The no name stuff fails in short order.
Thread Starter
Junior Member
Joined: Mar 2018
Posts: 28
Likes: 0
From: NorCal
2014 G63, 2008 G500, 2019 RS3
I would check on the size for you, but I am in the midst of moving and all of my tools are packed. I do know that the wrench that came in the kit splayed out so I ended up grinding down a regular open end wrench to make it thin enough to use to get the nut off. Don't go with a no name aftermarket fan clutch - get either genuine Benz or Sachs clutches. The no name stuff fails in short order.
Thanks
MBWorld Fanatic!
Joined: Nov 2002
Posts: 1,028
Likes: 133
From: Massachusetts
2018 GLE350, 2014 G550, 2000 SL500, 1980 TR8, 1995 E320 Cabriolet
Thread Starter
Junior Member
Joined: Mar 2018
Posts: 28
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From: NorCal
2014 G63, 2008 G500, 2019 RS3
So I was right. Two independent shops quoted me $850 for the water pump replacement. $150/hr labor is crazy.
I received my new pump, have all the bolts out of the old pump, and noticed that on the top far right side of the new pump, there is an opening for a coolant line while the old pump does not. On the write up I’m going off of, the their pump also has no tube here..
Looked around some more online and all the replacements seem to have the tube like my new one does. Kind of confused...
I received my new pump, have all the bolts out of the old pump, and noticed that on the top far right side of the new pump, there is an opening for a coolant line while the old pump does not. On the write up I’m going off of, the their pump also has no tube here..
Looked around some more online and all the replacements seem to have the tube like my new one does. Kind of confused...
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Junior Member
Joined: Oct 2019
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2019 X166
I am just finishing the same project. My tensioner pulley locked up first. Noticed a bunch of play in the water pump shaft and fan clutch. I decided to do plugs, value covers and the oil filter housing seals while I had it appart. Mine is a 2003 with 112,000 miles
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Thread Starter
Junior Member
Joined: Mar 2018
Posts: 28
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From: NorCal
2014 G63, 2008 G500, 2019 RS3
Awesome! Always cool to see other members taking on similar projects. Surprisingly, my engine DOESNT leak oil (knock on wood) so I haven’t changed any other seals. I noticed your new pump has the same opening on the right side top. What did you tie that into or did you end up plugging it?
Junior Member
Joined: Oct 2019
Posts: 19
Likes: 9
2019 X166
It's plumbed to the oil cooler. One line goes to the thermostat housing, the other to the water pump. Mine is almost back together. I used factory parts for everything except the fan clutch. The clutch will be here tomorrow so hopefully I'll have time to finish by the weekend.
Thread Starter
Junior Member
Joined: Mar 2018
Posts: 28
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From: NorCal
2014 G63, 2008 G500, 2019 RS3
It's plumbed to the oil cooler. One line goes to the thermostat housing, the other to the water pump. Mine is almost back together. I used factory parts for everything except the fan clutch. The clutch will be here tomorrow so hopefully I'll have time to finish by the weekend.
Now I’m wondering why my (and some other m113 engines) don’t have that oil cooler? I’m wondering if I should buy one and plumb it in?
I might be buying a G55 this weekend so I’d like to get this bad boy done and sold 😎
Thread Starter
Junior Member
Joined: Mar 2018
Posts: 28
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From: NorCal
2014 G63, 2008 G500, 2019 RS3
BUT, the car seemed to have a hard time starting? Tried about 3 times and it finally started. Not a lack of power (battery/alternator). Just seemed rough. Sounds fine once started... could I have thrown the timing off somehow?? I’m not sure that would be possible. Should I fill coolant and take it for a spin tomorrow?
Any thoughts would help..
Thread Starter
Junior Member
Joined: Mar 2018
Posts: 28
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From: NorCal
2014 G63, 2008 G500, 2019 RS3
Super random that it would go out (if that’s what it was) right after swapping the water pump... but I’ll keep you guys updated.
Thread Starter
Junior Member
Joined: Mar 2018
Posts: 28
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From: NorCal
2014 G63, 2008 G500, 2019 RS3
Thats what I was thinking... I did some research and the CAM position sensor sounds to be the culprit. I ordered one and will throw it in on Tuesday. The engine turns over fine and wants to run but seems like the engine isn’t getting fuel.
Super random that it would go out (if that’s what it was) right after swapping the water pump... but I’ll keep you guys updated.
Super random that it would go out (if that’s what it was) right after swapping the water pump... but I’ll keep you guys updated.
Hopefully someone here is “working from home” and wants a mystery to solve.. I replaced the CPS but the car is still having a startup issue... here is a link that should take you to the video:
https://share.icloud.com/photos/0lrc...grXf6H5HCfJPSw
You'll notice it turns over fine the first time but just no ignition.. I then turn the key off and back on and it then starts normally.
At one point a TCM error popped up but I haven’t seen it again.
Did I miss something when reinstalling the belt? Did I unhook something by accident? Once the car is one it runs fine... I drove it for 15-20 minutes the other day and had no symptoms whatsoever when running. Any ideas are greatly appreciated.
Thread Starter
Junior Member
Joined: Mar 2018
Posts: 28
Likes: 0
From: NorCal
2014 G63, 2008 G500, 2019 RS3
Hopefully someone here is “working from home” and wants a mystery to solve.. I replaced the CPS but the car is still having a startup issue... here is a link that should take you to the video:
https://share.icloud.com/photos/0lrc...grXf6H5HCfJPSw
You'll notice it turns over fine the first time but just no ignition.. I then turn the key off and back on and it then starts normally.
At one point a TCM error popped up but I haven’t seen it again.
Did I miss something when reinstalling the belt? Did I unhook something by accident? Once the car is one it runs fine... I drove it for 15-20 minutes the other day and had no symptoms whatsoever when running. Any ideas are greatly appreciated.
https://share.icloud.com/photos/0lrc...grXf6H5HCfJPSw
You'll notice it turns over fine the first time but just no ignition.. I then turn the key off and back on and it then starts normally.
At one point a TCM error popped up but I haven’t seen it again.
Did I miss something when reinstalling the belt? Did I unhook something by accident? Once the car is one it runs fine... I drove it for 15-20 minutes the other day and had no symptoms whatsoever when running. Any ideas are greatly appreciated.
Today I fuel pressure tested it and fuel pressure is fine. The CEL popped back on for the same P0341 code for the camshaft position sensor A circuit bank 1.
Any ideas? Trying to save a few hundred bucks at the dealership or shop. Maybe buy another CPS and throw it in?
thanks guys.
Thread Starter
Junior Member
Joined: Mar 2018
Posts: 28
Likes: 0
From: NorCal
2014 G63, 2008 G500, 2019 RS3
I went ahead and replaced the cam position sensor. Started the car, same issue.
Today I fuel pressure tested it and fuel pressure is fine. The CEL popped back on for the same P0341 code for the camshaft position sensor A circuit bank 1.
Any ideas? Trying to save a few hundred bucks at the dealership or shop. Maybe buy another CPS and throw it in?
thanks guys.
Today I fuel pressure tested it and fuel pressure is fine. The CEL popped back on for the same P0341 code for the camshaft position sensor A circuit bank 1.
Any ideas? Trying to save a few hundred bucks at the dealership or shop. Maybe buy another CPS and throw it in?
thanks guys.
hope this helps some other G owner out there.
