Just to Share Hydraulic Roof Pump

sumotan · Post by **sumotan** » Thu Jan 14, 2021 10:32 am

Hi Gents
Just to share, some nice gent posted this in FB Z4 group. Seems like a used in good condition frm ebay is about $150. Think its a good idea if it really works to quickly purchase 1 to keep as spare.

Cheers

Rucky · Post by **Rucky** » Mon Jan 18, 2021 8:46 pm

I saw that you can buy a brand new replacement motor now on Ebay
Chinese but the BMW ones probably are as well, I think they were about £50.

Smartbear · Post by **Smartbear** » Mon Jan 18, 2021 8:56 pm

Rucky wrote: ↑Mon Jan 18, 2021 8:46 pm I saw that you can buy a brand new replacement motor now on Ebay
Chinese but the BMW ones probably are as well, I think they were about £50.

To fit the e89? Got a link for that?

Rob

flybobbie · Post by **flybobbie** » Tue Jan 19, 2021 11:02 am

Other than flooding, these seem pretty reliable, i wouldn't bother having a spare.

enuff_zed · Post by **enuff_zed** » Tue Jan 19, 2021 11:56 am

flybobbie wrote: ↑Tue Jan 19, 2021 11:02 am Other than flooding, these seem pretty reliable, i wouldn't bother having a spare.

Oh no! That's done it.

Rucky · Post by **Rucky** » Wed Jan 20, 2021 9:58 am

The motor I saw on eBay was for E85 not E89. I have searched a nd searched again but cannot find at the same price, a new Chinese one is now £100+
Sorry about that but I was surprised at the time as I spent about 170 for a refurbed one 2/3 years ago. Would buy new motor now if I had to.

ronk · Post by **ronk** » Thu Jan 21, 2021 10:36 pm

I wouldn't fancy a chinese unit.

Buy cheap and buy twice!

Rucky · Post by **Rucky** » Fri Jan 22, 2021 10:26 am

It was Amazon where I saw the replacement motors for £50 not EBay
The trouble with a refurb motor is that the motors are crimped together and the crimps have to be drilled out to disassemble

Convertible Top Hydraulic Roof Pump Motor with Connector fit 2003-2008 BMW Z4 E85 MOTOALL
$60 + 12 shipping
https://www.amazon.com/Convertible-Hydr ... 72GK&psc=1

$119 including the Motor to Pump mount /O seal adapter
Rugged Auto Parts E85 Convertible Top Hydraulic Roof Pump Motor & Bracket 54347193448 for BMW Z4

flybobbie · Post by **flybobbie** » Fri Jan 22, 2021 10:30 am

Rucky wrote: ↑Fri Jan 22, 2021 10:26 am It was Amazon where I saw the replacement motors for £50 not EBay
The trouble with a refurb motor is that the motors are crimped together and the crimps have to be drilled out to disassemble

Convertible Top Hydraulic Roof Pump Motor with Connector fit 2003-2008 BMW Z4 E85 MOTOALL
$60 + 12 shipping
https://www.amazon.com/Convertible-Hydr ... 72GK&psc=1

$119 including the Motor to Pump mount /O seal adapter
Rugged Auto Parts E85 Convertible Top Hydraulic Roof Pump Motor & Bracket 54347193448 for BMW Z4

The reviews tell you everything.

RobbiZ4 · Post by **RobbiZ4** » Sat Jan 14, 2023 2:07 pm

sumotan wrote: ↑Thu Jan 14, 2021 10:32 am Hi Gents
Just to share, some nice gent posted this in FB Z4 group. Seems like a used in good condition frm ebay is about $150. Think its a good idea if it really works to quickly purchase 1 to keep as spare.

20230114_140147.png (180 KiB) Viewed 449 times

Hi guys,

In the meantime I have tested this Audi A5(B8) hydraulic pump intensively on my hydraulic test bench:

: 20230110_Audi_A5_(B8).jpg (161.73 KiB) Viewed 449 times

The behavior of the pumps is not remotely comparable! The AUDI A5 pump must therefore never be used as a replacement for a defective Z4 E89 pump.

Smartbear · Post by **Smartbear** » Sat Jan 14, 2023 4:27 pm

In what way does it differ from the e89 version?
Rob

RobbiZ4 · Post by **RobbiZ4** » Sat Jan 14, 2023 7:00 pm

Smartbear wrote: ↑Sat Jan 14, 2023 4:27 pm In what way does it differ from the e89 version?
Rob

The pairs of hydraulic cylinders are moving different compared to the E89 ones when using the exact same solenoid sequences.

RobbiZ4 · Post by **RobbiZ4** » Thu Nov 23, 2023 3:11 pm

And there is another remarkable difference:

The hydraulic hoses of our E89 are fitted into the E89 hydraulic pump from both sides, whereas the Audi A5 pump has to be fitted from only 1 side.

: 20231123_A5_&_E89.jpg (144.43 KiB) Viewed 162 times

: 20231123_Right.jpg (137.45 KiB) Viewed 162 times

: 20231123_Left.jpg (119.26 KiB) Viewed 162 times

A5 pump connected to 2x3 hydraulic rams in my TestBox.

: 20231123_A5_in_TestBox.jpg (130.45 KiB) Viewed 162 times

: 20231123_A5_cpr.jpg (155.43 KiB) Viewed 162 times

Putting the A5 pump into an E89 would be very difficult due to too short hydraulic hoses from the left.

But this doesn't matter due the following test result, I got confirmed once again today:

RobbiZ4 wrote: ↑Sat Jan 14, 2023 7:00 pm
Smartbear wrote: ↑Sat Jan 14, 2023 4:27 pm In what way does it differ from the e89 version?
Rob
The pairs of hydraulic cylinders are moving different compared to the E89 ones when using the exact same solenoid sequences.

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