Can you identify these parts

[jk911]

Does anyone know the part numbers and or function of these parts??

I suspect they may cause the idle/vacuum problems in my '75 911

[jk911]

Any takers ?

I guess I should have stayed away from the sporto, its causing too many unknown problems!

any other sporto owners our there who have had vacuum problems ?

[Joeaksa]

900 067 065 02 for number 17, control valve.

905 116 725 00 for number 11, check valve.

Hope it helps!

Joe

[Jim Sims]

Patience! The parts catalogs are a little heavy to carry around all day. Part 17 is a control valve and the part no. is 905.108.370.01 or 905.108.370.03 for engine 911/90/99. Part 11 is actually two pieces: return valve 905.116.725.00 (this part number may also include the socket) and socket 911.125.341.01; the A 14 x 18 gasket which seals the socket to the air box is 900.123.007.30

Cheers, Jim

[Jim Sims]

Joe, you're one line off; 900.067.065.02 is a M8x 15 cheese head screw. Cheers, Jim

[Joeaksa]

Jim,

Damm, its hell getting old! How in the world did you know I was one line off ??

I love this program! Thanks for catching my mistake!

Joe

[jk911]

Thanks guy's

this board is a wealth of knowledge.
I love it.

Just to be difficult , do you know what the function of these is, what symptoms could I expect if they are malfunctioning ?

[Jim Sims]

Joe, I'm probably looking at the same catalog listing!

jk911, I only know what I can read about Sportomatics but here goes: The control valve is a modulating valve that adjusts the rate of clutch engagement according the the relative position of the throttle. It can be adjusted to obtain a softer, delayed clutch engagement or a firmer, faster clutch engagement; there is an adjustment for upshifting on acceleration and downshifting on deceleration. I doubt the control valve is affecting your idle except through the vacuum. The control valve adjustment procedure states that the control linkage and engine idle speed be adjusted correctly before making any control valve adjustments. The return valve or check valve just keeps vacuum on the control valve side; if it was leaking I suspect you would have shifting (automatic clutch engagement) problems during low engine vacuum conditions such as accelerating at wide open throttle. Before I'd start replacing valves I'd look for vacuum leaks. What is the condition of the vacuum hoses associated with the control valve? If they are original they likely warrant replacing. Is the vacuum storage tank leaking (item 25 in the above diagram)? Here is the vacuum hose information; the catalog states the hose is sold by the meter. Hose between control valve and servomotor on transmission (item 22 on the above diagram): 15 mm x 3.5 mm x 350 mm long; PN 999.181.282.50 . Hose between control valve and vacuum storage tank (item 20 in the above diagram): 12 mm x 3.5 mm x 450 mm long; PN 999.181.283.50 . Hose between control valve and check valve on air box (item 24 in the above diagram): 12 mm x 3.5 mm x 360 mm long; PN 999.181.283.50 . If you can't find the exact size hose (the OEM stuff can be expensive as sin; I buy my German made vacuum hose from a local VW parts house or through Pelican) something close will likely work as long as it seals well and doesn't collapse under vacuum. Good luck, Jim

[jk911]

Thanks for all that valuable information Jim,

The valve on the air box is badly rusted and the hoses look old and original I will change these and report my results.

Thanks
John

[Wayne 962]

Sportos are generally frowned upon as being unreliable. I on the other hand think that the problem is that no one really knows anything about them (especially me).

I would think that a good restored Sportomatic car would be worth $$$ because of its uniqueness. This would probably apply most to the 911SCs though...

-Wayne

[Roland Kunz]

Hello

Sportos need some attention and regular fresh oil then they run very long without any problems.

It also needs a intelligent user wo is willing to shift or select a low gear in the city.

Grüsse