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1.6 to AAZ swap: vacuum pump and int. shaft compatibility
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vandoka
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PostPosted: Sun Dec 08, 2019 1:33 pm    Post subject: 1.6 to AAZ swap: vacuum pump and int. shaft compatibility Reply with quote

I have a 1987 syncro doka with the 1.6 td swapping into an AAZ longblock from Quality German. Thomas send me an AAZ vacuum pump but it seems not mesh well with the intermediate shaft gear from the 1.6.

The 1.6 vacuum pump is slightly different (shorter and does not have the extended collar/o-ring that inserts into the block), and it is difficult to tell the pitch of the gears.

The gears on the AAZ vacuum pump are compatible with the 1.6 int. shaft gear when I put them together by hand but I am not having luck getting the new pump installed into the block with the int. shaft in place. Despite patiently trying to align the gears I am thinking the AAZ had a slightly different intermediate shaft gear than the 1.6.

So before I try to source an appropriate int. shaft has anyone successfully used and older 1.6 int. shaft with a newer AAZ vacuum pump?

(photo shows AAZ pump on the left, 1.6 pump on the right)

Thanks!
Image may have been reduced in size. Click image to view fullscreen.

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1987 2wd Westy "Vanny" 2.5 RMW Subaru
1987 Syncro Doka 1.6 TD swapped to AAZ
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MarkWard
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PostPosted: Sun Dec 08, 2019 2:23 pm    Post subject: Re: 1.6 to AAZ swap: vacuum pump and int. shaft compatibility Reply with quote

Can you swap the driven gear on the two pumps? If otherwise I would expect the pump and intermediate shaft would be a “pair”. Also you need to verify with the pan off that the crankshaft and connecting rod clear the 1.6 intermediate shaft is they rotate. Larger stroke gas engines have some clearance issues when mixing parts from different generations. Also unless the intermediate shaft has changed, the gear used to be pressed on.
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MarkWard
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PostPosted: Sun Dec 08, 2019 2:23 pm    Post subject: Re: 1.6 to AAZ swap: vacuum pump and int. shaft compatibility Reply with quote

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Last edited by MarkWard on Mon Dec 09, 2019 5:10 am; edited 1 time in total
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vandoka
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PostPosted: Sun Dec 08, 2019 5:53 pm    Post subject: Re: 1.6 to AAZ swap: vacuum pump and int. shaft compatibility Reply with quote

Thanks for the beta, I can check if the gears are removable. The clearance looks close so I will check that too.

Best,
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1987 2wd Westy "Vanny" 2.5 RMW Subaru
1987 Syncro Doka 1.6 TD swapped to AAZ
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gchristensen
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PostPosted: Tue Jan 14, 2020 8:43 pm    Post subject: Re: 1.6 to AAZ swap: vacuum pump and int. shaft compatibility Reply with quote

I have a AAZ and 1.6 vacume pump and have found they are not the same animal. The 1.6 seat is different from the aaz and gear cluster is different. Is yours not making vacume?
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vandoka
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PostPosted: Wed Jan 15, 2020 7:23 am    Post subject: Re: 1.6 to AAZ swap: vacuum pump and int. shaft compatibility Reply with quote

I had the Aaz specific vac pump and was able to source an Aaz intermediate shaft so the build continues. Lmk if.you need info on these parts.
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1987 2wd Westy "Vanny" 2.5 RMW Subaru
1987 Syncro Doka 1.6 TD swapped to AAZ
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