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Smart quod bastardus
 
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Join Date: Oct 2002
Location: Baltimore, MD, USA
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Quote:
Originally Posted by Speedy Squirrel View Post
Can someone measure the valve stem diameter for the wastegate valve? The reason I ask is that the guide looks just like a 911 exhaust valve guide on the cross section drawing that I have. If that is the case, it would be quite inexpensive to replace. It would also provide some wear limit info.
Hi Speedy,
Can you provide the dimension and tolerance on the diameter of the bore in the valve guide drawing you have?

This would be useful info for a machinist to make new guides.

thanks,
Fred
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1979 930 Turbo....3.4L, 7.5to1 comp, SC cams, B&B intercooler, Snow Perf water/meth injection, Rarlyl8 headers, Garret GTX turbo, 36mm ported intakes, Innovate Auxbox/LM-1, custom Manually Adjustable wastegate housing (0.8-1.1bar),--running 0.7bar max
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Old 12-02-2013, 09:42 AM
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I had a machine shop make a new valve guide for my WG. The item I could never source was the asbestos gasket. I punted on the rebuilt WG and bought a TiAL unit that was recommended to me by Imagine Auto. (this was several years ago when I lived in Kansas City. I can't seem to find those guys any longer. In the end, I feel that my "problem" was in a failing boost gauge sending unit and not the wastegate with the slightly leaky valve. I believe that somewhere in my parts stashes, I may still have the 1/2 rebuilt wastegate. It was modded back in the day with a huge long bolt and a metal disk inside apparently to offer adjustable boost.
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Old 12-02-2013, 02:26 PM
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Quote:
Originally Posted by fredmeister View Post
Hi Speedy,
Can you provide the dimension and tolerance on the diameter of the bore in the valve guide drawing you have?

This would be useful info for a machinist to make new guides.

thanks,
Fred
Unfortunately it has no dimensions, just a layout. That is why I was asking for the valve stem diameter measurement. It would be great if the guide is a standard 930 valve guide. Those are quite inexpensive. Also, the clearance specs are well known.

Old 12-03-2013, 06:39 PM
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I have an OEM wastegate that is apart in a box someplace - will try to find it tomorrow and measure the valve stem diameter.
Old 12-03-2013, 06:44 PM
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Quote:
Originally Posted by BoxsterGT View Post

T77911S-
I am considering this purchase as well.
What are the hose fitting sizes on the wastegate? The banjo bolt in your first photo appears to be M16 or M18. Are the Tial fittings done with Metric threads?
I have lots of Metric fittings & adapters so I may be able to help.
Len
Factory wastegates = M12x1.5mm hollow bolt, banjo fitting brazed to tube routed through engine sheetmetal. I can measure the tube size tomorrow if you wish.
Tial wastegate = M10x1.0mm bollow bolt, banjo fitting with 6mm (1/4") hose barb

FWIW -- a brand new factory wastegate does bleed some air between the valve stem and guide. How much? Never bothered to measure it, never needed to.
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Old 12-03-2013, 09:25 PM
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Thumbs up Another less expensive option, 951S WG

Another option:
I have a 951S 40mm WG with 31K with mounting flange available for under $100 available. Mounts differently, low profile but works great & good for under <550hp ...
PM me, later....


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Old 12-05-2013, 11:18 AM
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That would be a step backward on a 930.
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Old 12-05-2013, 11:36 AM
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number stamps

Quote:
Originally Posted by TurboKraft View Post
That would be a step backward on a 930.
What do the numbers stamped into the machined area on the top of the housing signify? Anyone know?

I have a wastegate 930.123.124 1R with 27-5688 stamped in.

Thanks - Mark
Old 12-09-2013, 04:58 PM
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Some blow-by through the stem is expected and is perfectly OK. WG is closed almost all the time and only opens on boost. Eventual leak through stem usually balances out on exhaust pressure. Too much stem leak will lift the wastegate on exhaust pressure alone (and rupture the diaphragm eventually).
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Last edited by beepbeep; 01-26-2014 at 02:42 AM..
Old 01-26-2014, 02:36 AM
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Quote:
Originally Posted by shbop View Post



While continuing my re-build, I ran into this. It cleaned-up alright, but is it worth re-building it, or having it done; who re-builds them?
Diaphragm: 930-123-235-1R
Top housing: 930-123-215-6R
Base of housing: 930-123-214-1R
Spring- ?
The top housing also has the number: 24-12281
Is it just a matter of replacing the torn diaphragm and insuring the integrity of the housing? How can I identify the spring? Thank you!
Ive got a factory wg that has a good valve, only prob with it is a stripped thread in the charge hole if your interested
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Old 01-29-2014, 03:37 AM
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Opened my wastgate

But there was only one thin metal seating gasket. Everything sprang apart and flew. Does it go on the top or bottom? Thanks



Old 01-29-2014, 04:56 PM
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Quote:
Originally Posted by Robbbyg View Post
Ive got a factory wg that has a good valve, only prob with it is a stripped thread in the charge hole if your interested
I purchased a Tial, and put this on the back burner. Thank you.
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Old 01-30-2014, 07:21 AM
  Pelican Parts Technical Article Directory    Reply With Quote #32 (permalink)
 
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