Vacuum Pump on the Back of the Alternator

Dealing with all subsystems specific to the diesel powered Datsun-Nissan 720 pickup trucks.

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scottfelsen
Posts: 5
Joined: 4 years ago

Vacuum Pump on the Back of the Alternator

#1

Post by scottfelsen » 4 years ago

I have a 1982 Datsun 720 SD22 Diesel motor. On the back of the alternator is a break booster Vacuum Pump that has three oil tubes coming from it. Mine is cracked. Does anyone know where I can get another one?

https://www.flickr.com/photos/128925928 ... ed-public/

https://www.flickr.com/photos/128925928 ... ed-public/

plenzen
Posts: 867
Joined: 12 years ago
Location: Cochrane Alberta Canada

Re: Vacuum Pump on the Back of the Alternator

#2

Post by plenzen » 4 years ago

Sadly,,,,,,,,,, you may be pooched. They are kind of a rare bird now.
I believe that Al ( or maybe it was Phillip ) that used a 12vdc vacuum pump the accumulator and a switch/relay combo to power it.

I will see if I can find the write up on it. Once converted you can even swap out the OE alternator and use a Motorola one that apparently has a more robust diode bridge in it than these guys.
Believe there is a thread on that too, in fact may be the same one.

The above being said. There may be a few guys on here that may MAY have a vacuum pump they are willing to part with.

Good luck

Found part of the thread here.
http://nissandiesel.dyndns.org/viewtopic.php?t=2915
Retired Pauly
Problem with being retired is that you never get a day off.
1987 D21-J SD25 KC
KJLGD21FN

waynosworld
Posts: 502
Joined: 7 years ago
Location: Vancouver Washington USA

Re: Vacuum Pump on the Back of the Alternator

#3

Post by waynosworld » 4 years ago

I asked you where you are located on the Nico forum, as your location is not known, I need to know where you are, I likely can help you if your close.
scottfelsen wrote:I have a 1982 Datsun 720 SD22 Diesel motor. On the back of the alternator is a break booster Vacuum Pump that has three oil tubes coming from it. Mine is cracked. Does anyone know where I can get another one?

https://www.flickr.com/photos/128925928 ... ed-public/

https://www.flickr.com/photos/128925928 ... ed-public/
I know the voices are not real,
but they have some really good ideas.

jim bob
Posts: 9
Joined: 7 years ago

Re: Vacuum Pump on the Back of the AlternatorI

#4

Post by jim bob » 4 years ago

I don't know where you can procure a new pump, but it is possible to repair your damaged one.

Get a piece of iron, 1/2 inch or more thick about 6" square or more. Set up the pump on this template, and clamp the broken piece tightly in place, then drill holes in the template. Bolt the pump to the template, (after disassembling it), then get a welder to brazen it up.

After properly cooling it, take it off the template, clean the inside of the housing, and it should be good as new.

jim bob
Posts: 9
Joined: 7 years ago

Re: Vacuum Pump on the Back of the Alternator

#5

Post by jim bob » 4 years ago

There are two oil lines on the pump, let from the engine oil gallery, and the return to the engine sump.

The third is the vacuum line which connects to the brake booster.

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