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I don't think you need as many of the M6x35 bolts as you have written down. I found Ace Hardware had everything I needed, except for the studs, which I got from Ian at 944online.com. The nice thing about the ones from Ace is they carry flange bolts, which are a lot nicer than the cheapy bolt/washer combination that Porsche used from the factory.
The bolt and washer isn't cheap. It's actually better because the washer stays still while the bolt turns, so the friction is between the washer and bolt, which is steel on steel. The flange bolt would grind against the pump housing when tightened down.
The hardware kits come with an extra bolt. Same thing happened to me.
Hey resurrecting this old thread to keep "water pump hardware" discussion together.
Backstory — in replacing my WP last week I stripped block threads on the top right water pump bolt—one of two bolt holes with the steel registration pins. On inspection I discovered that the registration pins (small rolled cylinders the bolt goes through) were LONGER than those on my old pump, keeping the new pump from sealing tightly to the block, and holding the new bolt ever-so-slightly off the water pump, reducing bolt-head friction and causing me to over-torque the bolt. BUT also the bolt not penetrating as deeply into the block, there were fewer threads for it to grip which only made it easier for me to strip the block.
OK fine—helicoil to the rescue. Also shortened the registration cylinders with a file. There's about 3mm for these to socket into the head—I filed them down to 2mm or 2.5mm so the new pump would go all the way in.
But now a new mystery more experienced water-pumpers may be able to help me with pertaining to pump hardware.
Bought a hardware kit (944 online, I think)—the aforementioned six 35mm bolts with one extra for a total of seven.
BUT I had a bag in my garage labeled "WP Hardware" from the last time I did this. Chromate hardware in the image below. That includes 40mm bolts and three 50mm (I have not idea what those might be for).
The PET does list two 40mm.... but where to these go? And why is the diagram number (11) in parentheses???
Maybe the 40's are for the two registration locations? Given that the threads at thes two locations don't start until 3mm into the head already?? ¯\_(ツ)_/¯
odonnell your spreadsheet is super-impressive—shoulda mentioned I'm asking about a 968—those 40's definitely came from somewhere—I'll have to get the micrometer out and test some bolt-holes for depth. Cheers
944 water pumps have a different part number than the 968. So okay - they are similar but how different I can't say.
Ignoring the 70mm bolt common to both 944 and 968 we see:
944 PET shows seven 35mm bolts.
968 PET shows four 35mm bolts + two 40mm, for six total, which is clearly wrong since there are seven bolts.
The two bolt holes with the registration collars clearly NEED the longer 40mm bolt, else you're only grabbing 2, maybe 3 threads on the block which won't hold the torque.
So lesson learned—I assumed the water pumps were the same and since I was ordering other things from 944online anyway, threw in a "944 water pump hardware kit" which isn't appropriate for the 968.
with the 40mm bolt with the 35mm bolt two deep (for registration collars), five are shallow 944 hardware 968 hardware
The 968 water pump has a larger impeller, as do all 3L 944's. Be sure to use the correct water pump. The 968 pumps also use split dowels to align the pump with the block. These dowels have to be removed if fitting on an S2.
03-17-2015 | 12:53 AM
Water pump hardware: 4 studs + 1 long bolt + ?? short bolts
on the top right water pump bolt—one of two bolt holes with the steel registration pins. On inspection I discovered that the registration pins (small rolled cylinders the bolt goes through) were LONGER than those on my old pump, keeping the new pump from sealing tightly to the block, and holding the new bolt ever-so-slightly off the water pump, reducing bolt-head friction and causing me to over-torque the bolt. BUT also the bolt not penetrating as deeply into the block, there were fewer threads for it to grip which only made it easier for me to strip the block.
