Carb Base Spacers/etc.

[angliagt]

                  On a '78 B210,does anyone know how (& in which order) the base

spacers/piece with one "horn" on it (does the "horn" go up,or down.

                 I've looked on the microfiche,& factory manual,but can't find a clear,

precise illustration.

                I need to get this thing going again! 

[datzenmike]

Picture would help maybe to explain the 'horn'.

[LenRobertson]

I looked in my factory F10 manual and they don't show the carb base phenolic spacer. I had the carb off my F10 a few months ago and my memory (which can't absolutely be relied on) is the sequence is:

Intake manifold, gasket, heat shield (if you have one), gasket, phenolic spacer with the "horn"/tube/whatever it is called going down into the intake manifold (will it even fit up into the carb base without the tube hitting the throttle butterfly?), gasket, finally the carb.

 

Later this morning when the coffee kicks in I'll try to find an A-series spacer and carb and see if the sequence I just wrote seems correct.

 

I don't know if they still do but Autozone did have A-series carb base gaskets available individually if you need any.

 

Have fun getting the washers and nuts onto the carb studs. Maybe you have more finger room on your B210 than I have on the F10. It can be done though if you have plenty of time.

 

Len

[B2Fresh]

I've tried looking on line and came up empty.. It might come down to get a shop manuel to see the brake down on how to assemble it.

I'll keep searching cuz now I'm curious to know..

Also because someone else asked me that same question earlier.

Oops.!!!

That was you that asked me that question.. Lol

Sorry Doug..

I'm still looking.. I'm still looking.

[jboulukos]

I recently obtained a factory Datsun/Nissan spacer and on the genuine parts box it is called "Insulator."  The part has a somewhat soft top and bottom so I did not use a gasket above or below it.

 

My configuration from bottom to top: 

 

manifold

heat shield

"insulator" aka phenolic spacer

carburetor

 

I believe the "horn" (cylinder extending from one of the holes) faces downward into the manifold.

 

Agreed, its certainly confusing.  They seem to have omitted this area from the service manual (I have 1978).  Seems like a very important spot because without appropriate parts, the carb may get too hot and/or a vacuum leak can occur.

 

Lets see if anyone can shed more light on this.

 

 

Here's a view of the saucer installed.  Again, no gaskets.

 

[LenRobertson]

I found an A-series phenolic spacer and as I suspected I think it can only be installed with the "horn"/tube going down into the intake manifold. If installed upside down the horn will hit the carb butterfly and the carb won't bolt down. The horn won't even fit into the primary bore of the cast iron carb base. If the spacer is turned end for end the horn will fit into the secondary bore but will hit the butterfly.

 

jboulukos - It does appear the factory Nissan spacer has gasket material bonded on both sides. I suspect (although don't really know) that after it is in place on the manifold for a few years the gasket material may harden and need to be replaced with a fresh gasket. I also imagine a fresh gasket between the manifold and heat shield would be wise, although unless the heat shield is disturbed when the carb is removed it may be okay to leave the old gasket in place. If the old heat shield gasket is not replaced and the engine acts like it has a vacuum leak, that is the first place I would suspect for a leak.

 

Len

[angliagt]

                Thanks guys! I got a new insulator (thanks B2Fresh!).

Once again,this is why you take pictures/make notes when you

disassemble. 

[Sierra]

Here are some pictures of a carb setup I removed a couple of months ago.

The carb is still attached to the intake.

It looks like the "horn" that angliagt is talking about is what I call a "nipple" and it goes up.

Hope this helps

 

 

[angliagt]

I recently obtained a factory Datsun/Nissan spacer and on the genuine parts box it is called "Insulator."  The part has a somewhat soft top and bottom so I did not use a gasket above or below it.

 

My configuration from bottom to top: 

 

manifold

heat shield

"insulator" aka phenolic spacer

carburetor

 

I believe the "horn" (cylinder extending from one of the holes) faces downward into the manifold.

 

Agreed, its certainly confusing.  They seem to have omitted this area from the service manual (I have 1978).  Seems like a very important spot because without appropriate parts, the carb may get too hot and/or a vacuum leak can occur.

 

Lets see if anyone can shed more light on this.

 

 

Here's a view of the saucer installed.  Again, no gaskets.

 

 

                      The "horn' I was referring to has a tube on it,as in the top picture,

& is seperate from the spacer,& is a lot thinner.

                      Just trying to figure out how it all fits together.......

[jboulukos]

                      The "horn' I was referring to has a tube on it,as in the top picture,

& is seperate from the spacer,& is a lot thinner.

                      Just trying to figure out how it all fits together.......

 

 

I am uncertain as to what you are referring to.  The tube on the OEM insulator is attached and unremovable from the spacer.

[datzenmike]

I would never have thought if this....

 

 

It only fits the primary side and how would it ever fit if pointing up???

 

My 710 had one, I took it off.

[angliagt]

I would never have thought if this....

 

 

It only fits the primary side and how would it ever fit if pointing up???

 

                       So,Mike,could I get away with just using the above spacer,without the "tube" -

meaning I don't also need the other (slimmer one) that came out of the car?