click-clack noise when reving up - 1986 930
 

hi,
bought recently a 1986 930 US. The car has been sitting outside for more than a year, also not started for long time.
now, trying to bring it back on the read and came across a strange click-clack noise when reving up the engine. most of the times when engine is turned off this "clack" noise shows up too.

pls look into video and share your thoughts... it has "limited" quality but gives a clue about what i am asking about i guess...

Albin930 - YouTube

any ideas?

thanks!
Krzysztof

First thing that comes to mind is the silicone washer bumper is shot. At the bottom of the pipe next to the pipe that feeds the intercooler

thanks for the reply Ganun; can you please look at the pic below and help me point on the item that you think of here? is it shown here?

http://forums.pelicanparts.com/uploa...1384028068.jpg

That noise is the sound of the diverter valve piston smacking against its housing end caps when you are suddenly closing the throttle - this happens when the washers/bumpers at each end harden and fall apart. The following is a detailed thread on that unit (although one of the posters, James Brown, gives out some wrong information about how the system on the 930 works) -

http://forums.pelicanparts.com/porsche-911-technical-forum/71370-changing-930-dump-gaskets-pictures-galore.html

Ronnie and I are talking the same thing but I don't see it in the parts diagram posted....

that is great help gents! many thanks!

last thing, though - any clue of the partnumbers of the gaskets/washers that need replacement here?

*edit: looked into PET and believe found the correct pn#: 930 110 149 00

will post up the diagram in a bit


thanks again,

regards,
Krzysztof

and now the diagram - item labeled with no. 7

http://forums.pelicanparts.com/uploa...1384081324.jpg

Yep, you need two number sevens.

Apologies if you have already thought of this, but since you will need to remove the intercooler and the diverter valve housing, you need to make sure you have a supply of both sizes of intercooler o-rings and the larger o-ring that goes on the neck of the throttle body. I always order more than I need in case I manage to tear one of the new ones when installing (very easy to do).

small intercooler o'rings = 99970147340
large " " = 99970146940
o'ring between diverter valve housing and throttle body = 99970147740

perfect!

was not that quick if it comes to searching for o'rings so part numbers came in right on time :-)

will report back when new washers are in and all put back together

many thanks once again.

rgds,
Krzysztof

gaskets arrived and installed. issue solved :-)

one again, many thanks Ganun and Ronnie!

regards,
Krzysztof

I love a happy ending!