cfc928gt

I'm in the middle of my TB/WP winter project. I was amazed at what bad condition the bolts were on the waterpump. I picked up some stainless steel replacement bolts at the local hardware store to use but I wanted to make sure there's no problem using them with the alloy block. I was surprised in doing a search that this has never been talked about before. Any issues with using them? They were cheap, $7.50 for all of them in the correct sizes.

6.0-928S

You can use them but you MUST apply anti-seize compund to the threads or they will gall.
Hammer

PorKen

Use anti-seize!

I have been replacing all non-load-bearing bolts and nuts with SS (I think they are only grade 5).

With a recent water pump change I used SS allen-head bolts + washers for the pump and thermostat housing. Looks great!

ErnestSw

You'll have the same issues with stainlness as with non. Use antiseize on them.

Garth S

Stainless is fine: if the old ones are as nasty as indicated, carefully run a tap down the bores to clean out the other half of the crud ... then dope up with antiseize.

cfc928gt

Guys, thanks for the replies and advise. I'll definately use anti-sneeze!

Gretch

did anyone mention using anti-seize?, 'cause that would be a good thing....

Tails

Caution,
When using anti-eize, ensure that it does not contain any carbon. Carbon and aluminium are not compatable. I use ROCOL Anti-scuffing Paste and have done so for many years on all applications from high temperature applications (exhaust systems) and on alloy.

Don't forget there are various grades of SUS and you should select the best grade suitable for the application.

Tails 1990 928S4 auto

The anti-seize that I use is a Raicol

cfc928gt

Tails, you just got my attention! I have a tube of Loctite Permatex Anit-Seize. Doesn't say what it contains other than mineral oils. Any idea if this is safe to use?

pasa

just be aware that the stainless bolts are not as strong as the steel bolts so you don't want to use them on structural components such as suspension ect.


Dan 1990 928GT

Mark

And...be careful not to over-torque! OR - You may find a use for your easy-outs!

Rod Underwood

I "Googled" this and only found a High Ttech Crystal Company in Isreal. Do you have any contact information?

Thanks
Rod

fst951

Permatex Silver or other Nickel based anti-seize will be fine. You can even use Copper based products. Stainless steel is much less likely to corrode in the holes than carbon based plated steel. I recommend using loctite purple 222 when installing all bolts that are non-structural in the engine. Anti-seize is fine but the nickel based products are really designed to help prevent galling of parts and corrossion at very high temperatures. Not really necessary for the water pump. A good sealant of any type will work nicely. I just like Loctite since the bolts don't easily back out on their own.

Stainless steel fasteners in general type A2 units in the DIN system have a strenght much less than a Grade 5 fastner. More like a 4.8 strength China bolt.

Good luck.

6.0-928S

Do a web search for 'Totally Stainless'. They sell all stainless bolts & nuts, U.S grade 5 & also U.S. grade 8 or better. Other than the Raceware studs in my engine the rest are all U.S. grade 8 & I got them all from them.
Hammer

Tails

CFC928GT and Rod,
Sorry about the miss spelling in the last paragraph.

The product I use is ROCOL Anti Scuffing Paste.

The web site for ROCOL is www.rocol.com and for North America is www.itwfpg.com.

I have visited ROCOL's web site in the UK and unfortunately they no longer list the ROCOL Anti Scuffing Past, however, there is a copper anti seizing compound available. Technical Data and Manufacturers Safety Data Sheets (MSDS) are available on this site located under maintenance and without entering a name in "Search" just click on "go" and it will list all products. Scroll through until you locate the anti-seize copper based compound then click on technical data and MSDS.

The original ROCOL Anti Scuffing Paste was a molibdum disulphite paste containting no carbon and I have been using my can for too many years to recount, on my motorbikes and cars with excellent results. Every nut, bolt and stud removed from my 928 has the threads coated before replacement and I never had any problems removing them.

Tails 1990 928S4 Auto