questions changing water pump on Mk2 with AC and power steering

[92EcoDiesel Jetta]

The water pump in my mk2 Jetta is making noise at less than 30k when it was last replaced with a stamped metal impeller ones. Not impressed with the quality.

I have a good used mk1 cast impeller water pump with good bearings and no rust and not worn impeller. Will it fit my mk2 Jetta?

If not, who sells a reasonably priced cast impeller water pump?

[8v-of-fury]

I think the only difference that could be is the size of the impeller. 30mm or 40mm, something along those lines.

1975 (gas and diesel) - 1998 (gas and diesel) use the same water pump housing and pump.

[92EcoDiesel Jetta]

Impeller size or hub size? I remember reading about different hub size.

[8v-of-fury]

must be hub size then. IF the one you have looks like the one you take off, it will work

[jlpst94]

The hub is different so you'll need the pulley.  Also on the older 1.5 the housing is missing the top center bolt hole for mounting. 


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[DanV990]

I'm using a MK2 water pump on the MK1 engine in my car. It bolted right on.

[92EcoDiesel Jetta]

Anyone changed a water pump on Mk2 with AC and power steering recently so it's fresh in their mind? The Bently says it's easy but the procedure is for no ac no pwr steering.

Looks like to remove the water pump only, the timing belt Intermeduate shaft sprocket has to come off. To remove water pump with housing, the ac/alt mounting cast iron bracket has to come off. That is not a simple job since I think the injection pump has to come off to get to a hidden bolt.

Please confirm the above before I rip into it.

[Dakotakid]

Confirmed. Not fun.

[92EcoDiesel Jetta]

Confirmed. Not fun.

So you did this job recently? How many hours did it take?

I suppose I should skip removing just the water pump method since it will be wasted effort if any of those 9 little rusty bolts break?

[8v-of-fury]

Probably looking at 8-10hours.

[rs899]

I am looking at doing this shortly , too.  I think my water pump is not pumping well and it's time to change the timing belt.  I am going to risk the side bolts as IIRC I had the pump off before and used anti-seize .  I love that stuff.

[TylerDurden]

If the alternator bracket has been removed within a year, it is possible to pull it without pulling the IP.

It helps to loosen the IP a bit, so mark its position beforehand.

The two bolts under the IP are accessed using a flexi-socket on the bolt nearest the pulley and an S-wrench on the bolt nearest the dipstick.

[92EcoDiesel Jetta]

Probably looking at 8-10hours.

Sounds about right. I spent about 4 to 5 hours today taking it out, taking it apart and cleaning it. I had trouble with the 2 bolts behind the IP, They both slipped when I turned the 1/2" ratchet and my heart sank. I cleaned the dirt around the bolts and pushed in harder while turning and they came out. The heads were slightly rounded so someone been in there before me. This water pump was making a loud racket and the bearing had about 1/8" wobble and it is amazing it was not leaking! What kind of bearing and seals is in the water pump? I will try to press it apart and have a look inside.

I used a propane torch to heat the 9 bolts before torquing on them and they all came out without problems. I had no choice but to reuse the housing since the spare Mk1 housing I have have smaller hose barb sizes (the 2 small barbs).

On the left is the MK2 Eco water pump, on right the MK1 with the smaller barbs


Here it is apart



New pump (Graf) next to the old

[92EcoDiesel Jetta]

I am looking at doing this shortly , too.  I think my water pump is not pumping well and it's time to change the timing belt.  I am going to risk the side bolts as IIRC I had the pump off before and used anti-seize .  I love that stuff.

I used anti seize in installing the new pump along with the metal/rubber gasket. I will go one step further the bolts to housing in an attempt to keep moisture from entering from the outside. Maybe it will help the next time where I will take only the 9 side bolts out, which is less work than pulling the IP and AC/alt bracket/ water pump housing. Just have to clamp the timing belt on the sprockets, slacken the timing belt tensioner, remove I-shaft sprocket w/o disturbing IP or cam timing.

It is ridiculous the amount of work I had to do to replace a fricken water pump! What were the VW engineers thinking when they designed this damn engine?

[92EcoDiesel Jetta]

If the alternator bracket has been removed within a year, it is possible to pull it without pulling the IP.

It helps to loosen the IP a bit, so mark its position beforehand.

The two bolts under the IP are accessed using a flexi-socket on the bolt nearest the pulley and an S-wrench on the bolt nearest the dipstick.

Thanks for that tip! I will try it out when I have the IP back in.