Cleaning Fuel Injectors - Nissan : Datsun ZCar forum :Nissan Z Forum: 240Z to 370Z
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post #1 of 15 (permalink) Old 12-22-2018, 03:55 PM Thread Starter
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Cleaning Fuel Injectors

I have a '75 Z. I have pulled the fuel injectors to clean them. I have had my car since 1999. I would have assumed the injectors were original but I am thinking they are not now. In looking at the hose from the fuel rail to the injector it says GERMANY on it. I am thinking maybe these are Bosch injectors? They dont seem to have any O rings but down by the outlet of the injector there is fairly wide O ring. Anyone know what these are? Ive included a pic of them.

Next question would be are these good injectors to keep and behold or should I think of something else.

Thanks,
GT
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post #2 of 15 (permalink) Old 12-23-2018, 12:46 AM
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Mr.GT75Z:

Well, the Z was built with a version of the Bosch L-Jetronic fuel injection system. However, I suspect the (metric) hose was installed in service.

Beyond that, I'm unclear about just what is your question. Is there some reason you wouldn't use your injectors? The seals are available in the aftermarket. And you're only a couple of searches away for tips on reconditioning the injectors.

Or, if you've money to burn, you could replace them all.

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post #3 of 15 (permalink) Old 12-23-2018, 11:27 AM
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O-ring is present, its that wide band around the mid section of the injector. What you see missing is the pintle cap. One reason being these may have been replaced at some point with non oem injectors.

1975 280Z F54/N47 MSA 6-1 Header 2.5 Exhaust
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post #4 of 15 (permalink) Old 12-23-2018, 03:21 PM Thread Starter
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I recall that now, the fuel injection system was a Bosch. I have cleaned three of them so far and they all seem to work fine. I will do the other 3 today. Plus the cold start injector.

My question about the O rings is that I only see the small O rings after pulling the injectors (assuming the small O ring is the one at the bottom (output) of the injector. I do not see any large O rings that came out with the injector.

The diagram in the Service Manual only shows a small O ring (see attached).
My other picture would be my guess where the large O ring would go.

Am I on the right track here?
Thanks,
GT
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File Type: jpg Injector Diagram.jpg (30.4 KB, 19 views)
File Type: jpg O rings.jpg (35.4 KB, 19 views)
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post #5 of 15 (permalink) Old 12-23-2018, 03:30 PM Thread Starter
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Originally Posted by bificus View Post
O-ring is present, its that wide band around the mid section of the injector. What you see missing is the pintle cap. One reason being these may have been replaced at some point with non oem injectors.
I do not see an O ring around the mid section of the injector. Just at the bottom of the injector (output end). When I pulled the injectors, the only O ring I am seeing is the one at the bottom.

Thanks
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post #6 of 15 (permalink) Old 12-23-2018, 04:28 PM
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Quote:
Originally Posted by GT75Z View Post
I recall that now, the fuel injection system was a Bosch. I have cleaned three of them so far and they all seem to work fine. I will do the other 3 today. Plus the cold start injector.

My question about the O rings is that I only see the small O rings after pulling the injectors (assuming the small O ring is the one at the bottom (output) of the injector. I do not see any large O rings that came out with the injector.

The diagram in the Service Manual only shows a small O ring (see attached).
My other picture would be my guess where the large O ring would go.

Am I on the right track here?
Thanks,
GT
You're on the right track, I'm sure that large O ring is more plastic than rubber at this point. Like I said before, the pintle is different than the oem in 75 ones are. I 'm sure its fine.

1975 280Z F54/N47 MSA 6-1 Header 2.5 Exhaust
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post #7 of 15 (permalink) Old 12-23-2018, 05:00 PM Thread Starter
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OK, what might the pintle be, I am not familiar with that term.
I guess what I am trying to figure out is do I need to order both small and large O rings.

Thanks
GT
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post #8 of 15 (permalink) Old 12-23-2018, 09:59 PM
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Its a piece of the fuel injector that directs or affects spray pattern. In your case you have newer ones to they're internal.


https://zcarsource.com/rebuilt-fuel-...80zx-non-turbo

1975 280Z F54/N47 MSA 6-1 Header 2.5 Exhaust

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post #9 of 15 (permalink) Old 12-25-2018, 02:41 PM
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The smaller ones fit into the manifold and the Pintel or end cap goes in here. The larger one goes around the middle for a snug fit into the plastic holder.

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post #10 of 15 (permalink) Old 01-06-2019, 06:19 PM Thread Starter
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Thank you Palladin. That is what made sense to me. However I am trying to get them together now and they will not go together without a lot more force than I am trying now. I have attached a photo of how I am putting them together with the O rings. When I took these apart, there was no large O ring in the middle. But I am trying to put them in as I am putting this back together. I cannot get the silver mounting piece and the O ring on together. The O ring will go on the injector by itself but I can't get the silver mounting piece on over it. If I try to put the O ring in the mounting piece, it fits just fine but then I can not get that on to the injector - again without using a lot more force than I have tried so far. And I have worked at it pretty hard.
Anyone have any thoughts on this?
Thanks,
GT
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