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Vauxhall Tigra 2009 - Hydraulic pump replaced now boot/roof won't open - Derseffect66

Initially my roof/boot were slow to open and close, often stopping in the same places which was fixed by just repressing the buttons. I lubed up the pivot points and it did make a noticable difference, didn't random stop anywhere near as much but does sometimes (usually when the boot is nearly closed. It still seemed slightly sluggish opening my roof/boot but definitely slower than it should be closing them.

After noticing my old pump was leaking (fluid level was fine), So I bought a sc*** one but I couldn't get the clamp off so sprayed wd40 carefully around the edges to remove the sludge and oxidised oil. I also sprayed a bit into the holes where the hydraulic lines go into the pump, let it run out then let it sit for a couple days. Refilled, reinstalled (lines put into pump look untidy but they are all in the correct places and secured.

Now the boot won't open. Motor is whirring like it's trying to open the boot but only moves slightly up a cm or 2, but it will lock fine. I haven't dared try the roof so far. I have disconnected the battery for a bit, and cheked battery voltage which is alright. Is it the motor or has the wd40 damaged anything? Not sure what I may have done wrong or what the issue is now.

Bit of a long one apologies. Thanks for any help!

Vauxhall Tigra 2009 - Hydraulic pump replaced now boot/roof won't open - elekie&a/c doctor
Think I’d put the old one back . Looks like this s/hand unit is not producing enough pressure..
Vauxhall Tigra 2009 - Hydraulic pump replaced now boot/roof won't open - edlithgow

My best guess (mostly by analogy with brake systems) would be its got air in it.

It could also be (as I suggested in an earlier thread on this topic) that WD40 wasn't a great choice. It MIGHT have damaged or hung up something, or, more likely, you might have failed to get it all out. Its likely it wont pump very well, since its low viscosity and is known to be a lousy lubricant.

Edited by edlithgow on 18/08/2024 at 10:48

Vauxhall Tigra 2009 - Hydraulic pump replaced now boot/roof won't open - Derseffect66

I saw a video in which they opened the roof a few times to clear the air out. I managed to get the roof down, it didnt seem particularly slow other than at the end which is where it usually stops if it fails, Unfortunately when closing the roof, the boot lid lifts as it should but the roof itself doesn't lift up, I had to manually help it shut. Now the boot doesn't work again,