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Water pump replacement on a 931

 
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poor-sche  



Joined: 06 Jan 2017
Posts: 76
Location: Los Angeles, CA

PostPosted: Thu Mar 05, 2020 3:31 pm    Post subject: Water pump replacement on a 931 Reply with quote

For those of you that have replaced the water pump while the engine was still in the car, did you use the supplied gasket or did use gasket maker? I canít seem to make enough room between the engine block and the tab on the control line. The pump barely fits in the space without the gasket; trying with the gasket is an exercise in futility. If I go with gasket maker, Iím afraid itís going to scrape off when I squeeze it into place. I hate to think the solution is to cut off the tab.


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MOTANUL  



Joined: 19 Nov 2018
Posts: 120
Location: ROMANIA BUCHAREST

PostPosted: Thu Mar 05, 2020 6:38 pm    Post subject: Reply with quote

I use the supplied gasket (very thin). I put it with great care and attention. It can break very easily. Try putting a little grease and two screws to hold the gasket in the correct position.

I also ordered new screws (the old ones were quite rusty).
Not all were the right length. So I mounted an old screw because the new one was too long and did not tighten. The rest were good.
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bureau13  



Joined: 07 Sep 2017
Posts: 277
Location: South Florida

PostPosted: Fri Mar 06, 2020 2:15 am    Post subject: Re: Water pump replacement on a 931 Reply with quote

I also used the supplied gasket. It took some fiddling but I got it in OK.

poor-sche wrote:
For those of you that have replaced the water pump while the engine was still in the car, did you use the supplied gasket or did use gasket maker? I canít seem to make enough room between the engine block and the tab on the control line. The pump barely fits in the space without the gasket; trying with the gasket is an exercise in futility. If I go with gasket maker, Iím afraid itís going to scrape off when I squeeze it into place. I hate to think the solution is to cut off the tab.


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poor-sche  



Joined: 06 Jan 2017
Posts: 76
Location: Los Angeles, CA

PostPosted: Fri Mar 06, 2020 3:56 am    Post subject: Reply with quote

I can barely get it place without the gasket, but I'll give it another shot. Maybe I can get someone to pry the control line away from the block while I squeeze it in.

Is it just me or do jobs that appear easy at first glance always end up being much more difficult with this car. Things always seem to get hung up by a couple of millimeters. One component or another is always in the way of the next; much more so than any other car I've wrenched on.
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Fasteddie313  



Joined: 29 Sep 2013
Posts: 1992
Location: MI

PostPosted: Fri Mar 06, 2020 4:24 am    Post subject: Reply with quote

Ideas would be gluing the gasket to the WP before install, and maybe just bending that tab out 1/4"..
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924RACR  



Joined: 29 Jul 2001
Posts: 8321
Location: Royal Oak, MI, USA

PostPosted: Fri Mar 06, 2020 4:56 am    Post subject: Reply with quote

I definitely recommend against removing the tab. Knowing these cars, there WILL be a vibration problem and things will break. Otherwise the engineers would not have put a tab there.

Great opportunity to remove that control line and replace the hose ends on it.
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Carrera RSR  



Joined: 08 Jan 2010
Posts: 1983
Location: Somerset, UK

PostPosted: Fri Mar 06, 2020 5:46 am    Post subject: Reply with quote

Disconnect the pipe at the turbo end? May give you more wriggle room?
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morghen  



Joined: 21 Jan 2005
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PostPosted: Fri Mar 06, 2020 6:23 am    Post subject: Reply with quote

Use victor reintz black silicone to keep the gasket on the pump, easy peasy.
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924RACR  



Joined: 29 Jul 2001
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Location: Royal Oak, MI, USA

PostPosted: Fri Mar 06, 2020 11:26 pm    Post subject: Reply with quote

I get it with using RTV to hold the gasket in place, but I will almost as an aside mention that I generally prefer to soak these type of gaskets - the paper fiber type - with oil to get the fibers to swell up - prior to install. While they sure won't hold in place much... disassembly becomes a breeze, they won't leak still, and there's no cleanup required after disassembly, they can often even be reused. This is big for us on the intake manifold and cam cover gaskets, on the racecar, when we want to remove and reinstall those somewhat frequently...
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Vaughan Scott
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K-Roll931  



Joined: 08 Jul 2017
Posts: 69
Location: Southfield, MI

PostPosted: Sat Mar 07, 2020 2:35 am    Post subject: Reply with quote

I used the supplied gasket with a wee amount of oil to swell it up some. It was a challenge, but I stuck two bolts through the pump and gasket to guide it in, and spent a while trying to get everything to line up.

I succeeded and haven't had any leaks. It's the easiest water pump I'll ever change.
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poor-sche  



Joined: 06 Jan 2017
Posts: 76
Location: Los Angeles, CA

PostPosted: Sun Mar 08, 2020 2:06 pm    Post subject: Reply with quote

Decided to go with gluing the gasket to the block with a high-tack gasket sealant. Let it set overnight. All seemed well, the gasket was on good and tight. When installing the pump, it was a very tight fit. My fears came to fruition when coolant started leaking during filling. Leaked right from the bolt hole with the tab. Took it back apart, and sure enough, it looks like the gasket had shifted and was torn when I inserted the bolt. If you look at the closeup below, you can see where the ďglueĒ was squeezed out. Donít know if thereís something weird about my particular car or Iím just much worse at wrenching than I thought. Either way, Iím just going to remove the tab.




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924RACR  



Joined: 29 Jul 2001
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PostPosted: Sun Mar 08, 2020 11:19 pm    Post subject: Reply with quote

It's gonna vibrate and break elsewhere. Take the tube off at one end.
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Carrera RSR  



Joined: 08 Jan 2010
Posts: 1983
Location: Somerset, UK

PostPosted: Mon Mar 09, 2020 3:27 am    Post subject: Reply with quote

If you remove the tab the pipe will vibrate, crack or wear a hole in itself. Then you have a massive boost leak you cannot locate without tearing the motor down. I will be the last place to look. As said before, remove the rubber elbow at the turbo end to give you more wriggle room.
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TJC  



Joined: 04 Apr 2010
Posts: 754
Location: Central-ish Arizona, USA

PostPosted: Tue Mar 10, 2020 1:31 am    Post subject: Reply with quote

I must agree that the tab should not be removed.
Generally engineers and designers have valid reasons for making a part the way they do...even though those of us who work on the beasts later would like to wring their necks for doing such devious things.
This is one of those "do it right now or do it again later" jobs. And good luck finding a replacement tube with an intact tab when you need one.
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