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chaseincats

Repair distributor vacuum advance pot?

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Hi,

Question for you guys.

My distributor's vacuum advance vacuum pot's bladder has a leak and is no longer working because of it.  I was able to figure out it was leaking by smoking the engine and seeing smoke coming out of the distributor cap (after capping that vacuum line off the engine ran way better).

Since that part isn't sold separately anymore, is there any way to fix it or do I just need to buy a whole new distributor?

 

-chase

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I took one apart and found that the diaphragm had become brittle and cracked.  You might be able to pour some liquid urethane in to the vacuum port as a desperation measure.  If it bridges the gap without leaking through it might seal it up.

I wonder if one of these other Datsun parts will fit.  Still spendy.  Might as well get a 1-2-3 distributor.

https://www.autozone.com/external-engine/vacuum-advance-distributor/duralast-vacuum-advance-distributor/293187_0_0_1382_5133

https://www.autozone.com/external-engine/vacuum-advance-distributor/duralast-vacuum-advance-distributor/293181_0_0_1382_3498

 

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I put one of these on my 77 that has an 80zx distributor and it seems to work just fine. Rockauto.com

Not sure what year Z you have.

 

Related Parts    
    NISSAN    1981    MAXIMA    2.4L L6    Exhaust & Emission    Vacuum Reservoir
Price  
 
BECK/ARNLEY 1790212 Info
Vacuum Reservoir CALIF equipped Except AUTO TRANS,FUEL INJECTION
Choose: 
[Wholesaler Closeout -- 30 Day Warranty] (Only 1 Remaining) ($15.69)    
 
 
  Part image  
$15.69
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1 minute ago, rcb280z said:

I put one of these on my 77 that has an 80zx distributor and it seems to work just fine. Rockauto.com

Not sure what year Z you have.

Related Parts    
    NISSAN    1981    MAXIMA    2.4L L6    Exhaust & Emission    Vacuum Reservoir
Price  
 
BECK/ARNLEY 1790212 Info
Vacuum Reservoir CALIF equipped Except AUTO TRANS,FUEL INJECTION
Choose: 
[Wholesaler Closeout -- 30 Day Warranty] (Only 1 Remaining) ($15.69)    
 
 
  Part image  
$15.69

I have a '78 280z.  That's awesome news, did you need to make any modifications to the part so that it fit/worked/pulled the proper distance etc?

Edited by chaseincats

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No to all of your questions. Bolted in like the original. I was willing to take that chance when I ordered one. Mine was bad as well. I don't recall if there is a difference between the 77 and 80 advance plates so keep that in mind. I've been running an 80 distributor for 3-4 years now. 

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That is a weird paste.  Seven links in one.

The ZX vacuum cans are different from the 280Z units.  Looks like you should keep your eyes open for closeouts though.

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1 minute ago, rcb280z said:

No to all of your questions. Bolted in like the original. I was willing to take that chance when I ordered one. Mine was bad as well. I don't recall if there is a difference between the 77 and 80 advance plates so keep that in mind. I've been running an 80 distributor for 3-4 years now. 

Awesome, I'll pick this up - thanks!

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7 minutes ago, Zed Head said:

That is a weird paste.  Seven links in one.

The ZX vacuum cans are different from the 280Z units.  Looks like you should keep your eyes open for closeouts though.

Gah, is there a way to check to see if the PO put a zx dizzy in here by chance?

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It'll have the ignition module on the side facing forward on the distributor cap. Sometimes known as the match box.

Edited by rcb280z

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Just now, rcb280z said:

It'll have the ignition module on the side facing forward of the distributor cap. Sometimes known as the match box.

Mine doesn't have that.  So this vacuum pod won't work for me then?

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Since you're working on yours, check the breaker plate for rotation.  If the bearings are rusted up or have fallen out, it might be time to just get a replacement distributor.  The vacuum unit moves the breaker plate so if it won't move anyway it's a pointless fix.  You should be able to rotate it by hand.  The vacuum unit pulls on it.

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27 minutes ago, Zed Head said:

The ZX vacuum cans are different from the 280Z units.

Zed Head, are you talking actual size of the "can" or function?

Edited by rcb280z

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1 minute ago, rcb280z said:

I going to see if I kept my old vacuum can from my 77 distributor and see if it fits in the 80 unit.

Awesome, thanks!

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21 minutes ago, rcb280z said:

Zed Head, are you talking actual size of the "can" or function?

The round part that fits in to the distributor is smaller and the arm is a different length.  If I recall right.  Always worth double checking.

 

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I happen to have my box of distributor parts down.  I'll dig around and confirm.

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I did still have a vac can for a 77 280 that is defective. Going to die sect it some day.

I installed it in the 80 dizzy with no problem. Same goes with the new one, 81 maxima, and it fit.

 

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My mistake.  I might have been thinking of breaker plates.  

Did you check that the arm attaches to the same spot on the breaker plate?

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There is only one difference, minor one. The vac inlet port is on top now where the 280 inlet is on the bottom side of the can. Get some extra vac line just in case. I didn't need any but.....

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1 minute ago, Zed Head said:

Did you check that the arm attaches to the same spot on the breaker plate?

Yes it does. With the same screw also.

It's also attached to the dizzy body the same way as well.

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Chasincats, I'd go for it. They only have one left.

And my advance numbers are the same as it was with the 77 vac can and dizzy. Around 35 deg. Which is whats it been for a very long time.

Edited by rcb280z

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I must have been thinking of the 240Z cans.  I know I was keeping my eyes open for spares since they're hard to find.

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