Piston Squirters!

[Fishcop]

I cant seem to get any cleaning fluid to flow through the suirters on either case side. Also I've just discovered that they are spring loaded... why?

Any suggestions appreciated...

Wayne I've tried to clean them how you suggest in the book, but no luck.

Thanks

[Ho Hum 74]

John,

I had the same issues. You've really got to have compressed air. I'm assuming you have this. You need to get one of those fittings for your compressed air device that has a conical rubber nipple on the end. I got one at the local h'ware store for ten bucks. Attach it and crank your air up to about 60. To do the one side all you need to do is pop in some brake cleaner and then push the nipple onto the oil passage for the bearing. Press down hard and then hit the air. It should develop a quick burst of conical spray. You may have to let them soak overnight (mine was soaked for about a week becuas eI was out of town).

The other side of the case is trickier. You need to plug up the oil passage in the through bolt holes. I could not get a fuel tube to fit so to do this I took another air tool, a conical chisel, perfectly round with a sharp point. I wrapped a rubber glove over the cone part and inserted it into the bottom of the through bolt hole. This provided a nice tight seal. Then hit it with the brake cleaner and air from the top. You can also try liquid wrench for the more stubborn ones.

Hope this helps.

Tristan

[ChrisBennet]

I don't have Waynes book in front of me (and this should be in there) but I'll mention it just in case. The squirters require a fair amount of pressure to open (30 or 40 psi?) so you'll need to use an air compressor.
-Chris

[Wayne 962]

Some can be more stuck than others - the compressed air is a good next step...

-Wayne

[klaucke]

I have a '74 911S Targa, and I bought it with 3 bad cylinders. Two were low on compression, and one had NO compression. Upon teardown, the #3 cylinder had a broken piston and the rings had broken and made their way into the engine [got most all of the pieces out]. The #1 and #2 cylinders also had slightly broken pistons, where a piece of aluminum between the two compression rings broke [about 2 inches long].

Anyway... I bought replacement parts and am ready to put it back together, but I think that the oil squirters below the pistons must be bad. Why else would one whole side go bad, but the other stay perfectly fine [150 psi cold for the #4,5,6 cylinders]. How do I go about cleaning these oil jets? Does one oil pump supply the oil to both sides of the engine and hence their respective oil jet squirters?

Any help someone could give would be very appreciated!

On a seperate note, this car has 83k original miles, has recent paint [emareld green] and almost zero rust [only a little above the tranny, just where the paint baked off, but no rot] It did run with the bad cylinders, and other than those pistons is mechanically sound. It has Fuchs alloys, good tires, and a straight body. What would someone ball park the value at this car at, so I could know if I got ripped off. Thanks in advance.

[Fishcop]

Thanks everyone! I used the compressor and had success with all but one that was completely stuck. I drilled it out and will replace it with a new one (they're pretty cheap). Any one had to do this?

Thanks

[Ho Hum 74]

John,

I would have kept trying with the solvents. Good luck with it.

Tristan

[klaucke]

Where do you put the "nozzle" described above apply the compressed air to the oil squirters system? I'm trying to remedy my left side of the block, and I think that these squirters malfunctioned and led to piston failure on that side. Do I have to crack the case, or can I fix this with the heads/jugs removed? Any advice would be greatly appreciated.

[Ho Hum 74]

The nozzle is applied from the inside of the case in two ways depending on the case half you are working with.

1. Directly through the oil supply bore to the main bearing journals.
2. Through the case through bolt holes but you must block off the internal passage in the through bolt hole as described above.

This is the only method I know unless someone else knows another. Wayne?

Good luck with it. Tristan

BTW. With all your carnage I can't see why you wouldn't tear it all apart and clean it.

[briankeithsmith]

I just got my case back from the machine shop this week and was going to start the re-assembly this weekend. But today, I've been trying to "test" my piston squirters and have had no luck. I can't get any thing out of any of the six squirters.

I've tried everything from parts washer, brake cleaner, penetrating oil, and 60-80psi of air. And have gotten nothing out of the squirters.

I've followed the procedure as advised in the Porsche Workshop manual, and have blocked off the through bolt holes using 1/4 fuel line.

Any more suggestions.

What is on the backside of the piston squirter? Is there a valve? A spring? Anything? Just trying to figure out what causes it to open, and whether or not it should be open passageway all of the time, or just under certain pressure.

Any advice?

Brian
1983 930

[ChrisBennet]

I'll be testing squirters this AM. I'll take pictures of how to do it for you.
-Chris

[briankeithsmith]

Thanks Chris.

Brian

[350HP930]

If they have not opened up at 60 PSI they definantly need to be replaced.

[ChrisBennet]

I use normal pressure from my air compressor (~90psi) but the pistons squirters should open at less than that.

Squirt something like light oil or WD-40 in the oil feed hole so you can "see" the air coming out of the piston squirter.


On the left side of the case, use a rubber tipper air nozzle to squirt into this hole:


The right side of the case is a little trickier. The right side of the case has "X" and "K" shaped
oil passages. I've marked the path of the oil passages with a marker to you can see what
you are up against:


You need to plug the air passages where the holes meet internally i.e. at the intersection of the
lines forming the "X" and squirt air with a rubber tipped air nozzle into the bearing oil feed hole:



I made my plug using a piece of polyethethene rod and wrapped the sealing
area with some teflon tape to bring it up to 11.8mm.



A note on safety: If you plug a hole with your finger while the "plug rod" is in place you create an air gun that will shoot that rod across the room. There is no need to plug any hole with your fingers.
Also if you are using compressed air, wear safety glasses.

Hope this helps.
-Chris

[briankeithsmith]

Thanks Chris:

Those are the exact steps I followed yesterday. However the only difference was that I didn't have an air nozzle that could seal against the holes well enough. Bought a new air nozzle today, and had them all tested and working fine within 15 minutes.

IT PAYS TO HAVE THE RIGHT TOOLS!

Brian

[Fishcop]

Great response Chris.

Cheers

[dtw]

Originally posted by ChrisBennet
A note on safety: If you plug a hole with your finger while the "plug rod" is in place you create an air gun that will shoot that rod across the room. There is no need to plug any hole with your fingers.
Also if you are using compressed air, wear safety glasses.

-Chris

Another quick note - if you try using a finger to plug a hole and there is any solvent left in the passage under pressure, and your 'finger seal' fails, the solvent will get blown past your finger and quite likely flay it open like gutting a fish. Makes for a painful, messy wound. Ask me how I know.

[ChrisBennet]

Originally posted by dtw
Another quick note - if you try using a finger to plug a hole and there is any solvent left in the passage under pressure, and your 'finger seal' fails, the solvent will get blown past your finger and quite likely flay it open like gutting a fish. Makes for a painful, messy wound. Ask me how I know.

Ouch!
My pain for the week was the cat I'm baby sitting slicing my hands open (that wasn't painful) a little while before I spilled gas all over my hands trying to fix a carburator. No chance of infection now!
-Chris

[JohnJL]

Just want to say thanks again to Chris for the post above...I'm doing my first build and this was a great help.

thanks Chris

[1972_911T]

Just thought id stick my ten penneth in here for thouse who dont have a compressor to clean out my squirters I just used a ordinary plastic syringe, the left side of the case was easy I just stuck the nosle of the syringe straight into the hole that leads to the piston squrter in the top of the through bolt holes.

The right side was a bit more tricky and required me to blok off the through bolt hole with 1/4 inch fuel hose as others recommended then I stuck the syringe nozzel into the crank bearing oil supply hole to squirt solvent through the squirters. This worked for me but addmittedly it may not be so good if you squirters are relly blocked!