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Hi Guys,

Replacing cam belt without changing the water pump is false economy!

The attached pic shows the catastrophic failure that can happen with the water pump if it is not replaced at similar intervals to the cam belt. The vehicle is a Golf 1.9 TDI. The old pump (on the left in the pic) is next to the shiny new one (in case you couldn't tell). The failed pump is the original VAG water pump and failed at 196,000 Kms. The cam belt had been changed at 120,000 Kms, but not the water pump. I have no idea if it was a plastic impeller, because the impeller has disintegrated and vanished. There is no bearing left at all - I found some of the rollers in the lower cam cover. From the angle of the sprocket, you can guess what it did to the cam belt. Even the center metal cam cover has been re-sculptured because of contact with the free floating sprocket, and the engine mount has some interesting grooves cut into it. Fortunately for me, no engine damage, but I am still worried about the bits of metal from the pump that must be somewhere in the cooling system.

The first warning of failure was when the low coolant light came on and instructed me to stop. From inside the car there was no indication of anything wrong. Even the water temperature was just fine. From under the hood, there was a grumbling sound and steam coming from the cam cover.

If any of you are contemplating a cam belt change without changing the tensioner, consider my experience!

Cheers, Martyn
 

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So did the impellor fall off are they different style of pumps in that picture?

Yes you asked about the metal particals in the cooling system on your other post. ;)
 

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The left pump is the original VAG pump from when the vehicle was made. The new right hand one is from Wulf Gaertner Autoparts AG in Hamburg, Germany. Casing pretty much the same. The new one has a metal impeller, the old one was plastic (I found one of the pieces when I flushed the system). The metal that I was concerned with came from the bearing surround which has pretty much disintegrated. Perhaps the bearing seized and the outer rotated in the casting.

Martyn
 

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I hesitated a lot whether I should replace the WP or not when doing the scheduled timing belt job at 120tkm. Fortunately I decided to replace and was so happy to have a new WP when replacing the TB.

My original WP started to leak the coolant very badly already at 120tkm through its bearing and didn't rotate easily making a terrible squeak. Here is the picture of the original WP at 120tkm TBJ.



Btw, it seems that VAG has modified WP's since the part number has transitioned from 045 121 019 C to 045 121 019 D.
 

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Good Info!

Just getting prepared(mentally...as well as parts-wise) to change the TB and all associated parts on our 140,000km 05 Golf BEW.

I'm wondering whether the plastic impeller is an acceptable replacement part, or not.

Any recommendations as to suppliers or parts would be appreciated, either here in the forum, or through PM

Thanks,
Greg
 

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Good Info!

Just getting prepared(mentally...as well as parts-wise) to change the TB and all associated parts on our 140,000km 05 Golf BEW.

I'm wondering whether the plastic impeller is an acceptable replacement part, or not.

Any recommendations as to suppliers or parts would be appreciated, either here in the forum, or through PM

Thanks,
Greg
Acceptable, yes. Best, no, I'd get an aftermarket metal pump. You just don't hear of this problem on them.
 

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Not as much on the TDI, but on the !.8T and 2.0's we do a lot of stripped water pumps. Of course we do the belt then too unless it is a low mile car. We have had them in the 30K range even.

At the start we were using factory pumps, but had one of them strip too, now use only metal pumps. Have had good sucess with Graf, or Meyle,
 
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