CIS Problem on 1974 2.7

[tculling]

Car has been sitting for several years with rebuilt engine that has not been started. Before trying to start - changed oil, reconditioned fuel tank, new fuel filter,fuel lines, fog oil in cylinders. Ran fuel pump with fresh fuel - pumped fuel from filter to FD and FD through the return line. The problem is that there is no fuel coming out the injectors. Is this a bad FD or am I missing something that does not allow the fuel to come thru the injectors?

[eastbay]

Nothing comes out when you lift the plate? FD piston free?

[2aircooled]

You can lift up the air flow sensor plate lever (in the airbox).
After lifting, you should feel some resistance and hear the injectors squeal.
Do this only for a few seconds at most (and not too many times) or you might flood/ hydrolock the engine.

[boyt911sc]

With the FP running and the air sensor plate is at REST, there should be no fuel delivery through the injector/s. If it does, either the fuel injector/s are leaking or the mixture setting is too rich. If it does not deliver any fuel at this point, that’s NORMAL.

To test the fuel delivery through the injectors, lift the sensor plate arm up until fuel comes out. If no fuel comes out when the sensor plate is lifted (FP running), something is not right. Further investigation is needed.

Tony

[tculling]

I have lifted the sensor plate and there is no resistance and no fuel at the injectors.

[boyt911sc]

Originally Posted by tculling

I have lifted the sensor plate and there is no resistance and no fuel at the injectors.

TC,

Do a visual inspection of the fuel distributor plunger. Is the plunger resting below the fuel distributor? There should be about 1/2” long protrusion out of the barrel. What is the fuel pressures while the FP is running?

If you are having difficulties testing and evaluating your FD, I could give you a hand. I could do the test and evaluation for FREE. Send it to me with a return shipping label and will perform the tests within 48 hours after arrival. PM me if you are interested.

Tony

[tculling]

Thanks Tony! I will do the inspection of the plunger and then check the pressure from the fuel pump and let you know.

Thanks again for your help!
Tom

[tculling]

Tony, I don't see the plunger at all. When I reach up under the arm I can feel the hole directly under the FD unit but there is no plunger protruding. Tried to check the fuel pressure where it goes into the FD and it maxed out my gauge - looks like 135psi. Gauge may not be right?
Tom

[boyt911sc]

Originally Posted by tculling

Tony, I don't see the plunger at all. When I reach up under the arm I can feel the hole directly under the FD unit but there is no plunger protruding. Tried to check the fuel pressure where it goes into the FD and it maxed out my gauge - looks like 135psi. Gauge may not be right?
Tom

Tom,

Varnish deposits inside the fuel distributor could cause the plunger and primary pressure valve to get stuck. You need to disassemble the fuel distributor and get both the piston/plunger and PPV (primary pressure valve) slide freely inside the bores. What are the last 3 digits of the Bosch ID # on the plate? -006?

I could lend you a fuel distributor so you could run your motor and complete your start up tests. There is no obligation to buy and return the FD after you are done. Your only expense is the shipping costs. PM me if you are interested.

Tony

[tculling]

Tony, My last three are # - 004. I will take off the distributor and let you know. Thank you,
Tom

[eastbay]

The plunger will sometimes get stuck all the way up. You can grab the plunger nipple with a pliers and pull it back down, but not out. It may free up.

The real test is:
hold the FD upright and push the piston up into the bore, it should fall or drop easily back out. Do this several times to exercise it, if it still hangs up you are going to have to pull the plunger out and check the o-rings. If you get that far, remove all the o-rings and test the piston drop with no o-rings.

They are simple mechanisms, so don't hesitate to pull them apart.


PM sent

[boyt911sc]

Originally Posted by eastbay

The plunger will sometimes get stuck all the way up. You can grab the plunger nipple with a pliers and pull it back down, but not out. It may free up.

The real test is:
hold the FD upright and push the piston up into the bore, it should fall or drop easily back out. Do this several times to exercise it, if it still hangs up you are going to have to pull the plunger out and check the o-rings. If you get that far, remove all the o-rings and test the piston drop with no o-rings.

They are simple mechanisms, so don't hesitate to pull them apart.


PM sent

East bay,

Have you actually done a Bosch Fuel Distributor? The viton o-rings are all located in the interior of the FD. As a matter of fact, if you pull out the piston or plunger, you will see nothing except the bore of the barrel. There will be no o-ring visible as you claimed.

You can not inspect any of the o-rings by just pulling out the plunger or piston unless you have an X-Ray vision like Superman. Sorry to disagree with you but your post does make sense at all.

Tony

[eastbay]

Tony must be off his meds today


this link will explain everything you need to know about the FD, with pictures.


CIS fuel distributer cleanout w/pics

[boyt911sc]

Originally Posted by eastbay

Tony must be off his meds today


this link will explain everything you need to know about the FD, with pictures.


CIS fuel distributer cleanout w/pics

eastbay,

This is a Technical Forum and we could discuss and argue all day long but at the end of the day, we could still be friends. What you have posted earlier was INCORRECT. Why, because removing the plunger or piston from a fuel distributor will not expose the o-rings. I will tell you why.

We all make mistakes and I made a lot too. But to insist something you have no experience or knowledge is simply a sign of arrogance or borderline stupidity. Let’s begin the discussion with some pictures. Take note of the date (Jan. 18) that’s today in the photos.

Some of the fuel distributors I am trying to finish from members of this forum. And I have rebuilt so many of these fuel distributors that I lost count of them.



This is a FD-037 for a 930/turbo CIS:


A close up shot of the barrel with the plunger/piston pulled out. It is difficult to see the inside of the barrel because of the reflection.


Side by side picture of the barrel with plunger and barrel without the piston.


This is a better shot of a see-thru view of the barrel. As you can see, there is no o-ring in the bore hole because they are located in another section of the fuel distributor.


The six (6) injector o-rings are located at the other side of the barrel and buried deep in the fuel distributor body cavity. A complete teardown is necessary to view or inspect the o-rings in discussion.

SUMMARY:

The injector o-rings are not visible by simply pulling out the piston from the fuel distributor because they are NOT located there. They are at the other side of the barrel and without complete disassembly, you won’t even find them unless you are Superman with X-Ray vision.

End of presentation........Now it’s your turn to present your evidence.

Tony

[ARCSinAK]

+ 1 for Tony's knowledge!

[a&j]

[eastbay]

Tony must be having some kind of personal issues as evidenced by his meltdowns on the last few CIS threads. Bless his heart.

Back to helping the OP and his problem

1. the FD is chock full of o-rings, photo from attached thread



2. the FD piston must move smoothly and be able to drop under it own weight.

3. the thread I posted is great, but does not mention that you can chuck the nipple end of the FD piston in a drill and spin it like a lathe and clean it up with your abrasive of choice.

[boyt911sc]

Originally Posted by eastbay

Tony must be having some kind of personal issues as evidenced by his meltdowns on the last few CIS threads. Bless his heart.

Back to helping the OP and his problem

1. the FD is chock full of o-rings, photo from attached thread



2. the FD piston must move smoothly and be able to drop under it own weight.

3. the thread I posted is great, but does not mention that you can chuck the nipple end of the FD piston in a drill and spin it like a lathe and clean it up with your abrasive of choice.

Eastbay,

You gave an advice to the OP to pull the piston out and inspect the o-rings. Do you still remember that?

This all started with your poorly conceived advise. I made a comment that removing the piston or plunger will not expose the o-rings. Maybe you made a mistake or something and correct the blunder. BTW, the picture you posted above is not the plunger or piston. That is the barrel where the piston slide up and down.

Don’t take this personal, we are discussing a technical subject. Pulling out the piston will not reveal the o-rings. The o-rings are located on the other side of the barrel. As shown in the picture. And the barrel could NOT be removed or pulled out without splitting or separating the FD bodies. You could remove the piston but not the barrel without disassembly. This is what you are missing. Your understanding about the o-rings is FLAWED and accept it. The more you resist, the more you look bad.

Better spend some time learning the intricacies of the Bosch Fuel Distributor before giving poorly conceived suggestion to people. What I don’t understand is why people keep arguing on subject/s they hardly understand. I bet you have not rebuilt a FD before and got this idea from reading the Internet.

Did you see the o-rings when you pulled the piston out? Please confirm.

Tony

[a&j]

Eastbay,

At this day and age, we all have our own medicines and personal problems. There is no need to get your panties in a twist.

Posting someone is off their medicine or having a personal problem deviates from the technical topic and in addressing the OP’s Bosch FD issues.

We all want to help but somehow and unfortunately I have seen a lot of half baked post(s) that misleads and deviate from the technical solutions...and compounds the problems and issues...

By the way, Eastbay, again have you personally done a Bosch FD? Yes or No

Anyone can post links, crop pictures, regurgitate someone else post/pictures, etc.

If Yes, then is it for a 911...your prior post seems more confusing and does not make sense at all. Try explaining it again

If No, then please STOP...you appeared confused and do stop misleading the OP. Try explaining again that will help the resolve OP’s challenges

Everyone have an opinion but please stay on point...stick to the technical aspect. Thanks

[eastbay]

LOL, we were taking this stuff apart and fixing it before you showed up and will still be doing it after you are gone.