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bellbottomsdj · Joined: 06 Dec 2005 Posts: 7

I have a 931 Fuel Distributor with the center piston stuck. I dont want to wrench it out obviously, but the old fuel has it gunked up in there. Any ideas on how to get it out?.... Air Pressure through the main fuel inlet maybe?

thanks

dpw928 · Joined: 02 Nov 2002 Posts: 1860 Location: owasso, ok 74055

Try spraying PB Blaster in all the injector and WUR ports on the top of the distributor then wait for it to work. You could also try pressurizing the WUR port but be careful as too much pressure could harm the o rings and push the piston out too fast.

Dennis
_________________
81 931 5 sp
78 928 5 sp Silver
78 928 AT Euro Black

bellbottomsdj · Joined: 06 Dec 2005 Posts: 7

What is PB Blaster? I never heard of it..... So place it in the 4 injector ports, let it soak, and then seal those 4 holes & put air pressure through the main center port?... Any places I should seal up before pressurizing?

And yea, that thing looks like a bullet in loaded gun if pressure is added. I can see the headlines already "Man Shoots himself with fuel distributor"

dpw928 · Joined: 02 Nov 2002 Posts: 1860 Location: owasso, ok 74055

PB Blaster is a brand of penetrating lubricant sold in the US. Much better than WD-40. Think I would try the air without plugging the injector ports. If the piston is higher enough there will be very little air going to the injector outlets.

Dennis
_________________
81 931 5 sp
78 928 5 sp Silver
78 928 AT Euro Black

bellbottomsdj · Joined: 06 Dec 2005 Posts: 7

Yea, its all the way up in there..... I will take it to work & see if one of my mechanics can give it a shot on break or something... I have some PB Blaster, just dawned on me what it was (LONG DAY!)... I sprayed it in the 5 holes & will let it soak over night,,,,,

Any other suggestions if air pressure doesnt get it out?.... I am assuming 200lbs of air pressure should fire that thing out like a bullet though,,,,,

dpw928 · Joined: 02 Nov 2002 Posts: 1860 Location: owasso, ok 74055

If you blow it out, make sure the piston isn't damaged. They are machine matched to the distributor so replacment isn't possible.

Dennis
_________________
81 931 5 sp
78 928 5 sp Silver
78 928 AT Euro Black

bellbottomsdj · Joined: 06 Dec 2005 Posts: 7

Im going to have him set it on some 2" foam & have a folded blanket under it & then a phone book.... I am sure it will be okay once I get it cleaned out... I didnt think shooting it on the pavement would be a real good idea,,,haha

dpw928 · Joined: 02 Nov 2002 Posts: 1860 Location: owasso, ok 74055

If that one gets dinged or it's rusted there is a distributor on ebay with no bids (yet).

Dennis
_________________
81 931 5 sp
78 928 5 sp Silver
78 928 AT Euro Black

bellbottomsdj · Joined: 06 Dec 2005 Posts: 7

I sold this one to a friend, so I am going to try this first... If it fails, I'll let him know about it....

I should know by tomorrow so I hopefully will have time if this doesnt work... I am pretty optomistic that it will

helowrench · Joined: 25 Nov 2004 Posts: 44 Location: Dallas

I would not try to blow it out.
That might damage the diaphragm.

What i have done is use some berryman b12 chemtool.
put a few drops on the piston.
use a strong magnet and slowly work the piston. the b12 will dissolve the varnish

Rob

endwrench · Joined: 07 Dec 2002 Posts: 1631 Location: Victor, Montana

Good ole carb clean worked fine on mine. Did the same as helowrench with the magnet. Just keep working it and trying different solvents.

Todd