Is It Just The Weather?

R

RustyZ4

Veteran
 Maidstone, Kent
I have noticed in the last couple of weeks, when I put my roof down, it seems to have developed quite a loud "thunk" to it, i was wondering if its just the hot weather making the hydraulic fluid thinner, therefore less resistance, or is it something else?
 
Do you mean it flops shut over the last few inches of the close operation? Mine has always done that a bit. I usually put my left hand up to ease the weight over those last couple off inches of travel.
 
geordie_zed said:
Which part of the process is the 'thunk' ?
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Sorry should have given more info, its the last bit when the roof is closing, when the rear window comes down and shuts
 
RustyZ4 said:
geordie_zed said:
Which part of the process is the 'thunk' ?
Click to expand...

Sorry should have given more info, its the last bit when the roof is closing, when the rear window comes down and shuts
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Ah just spotted it's an E89 thread :oops:
 
Mine as always done that, for the five years i have owned it. My roof is opened everyday, during summer months.
 
Higher temps would make the hydraulic fluid less viscous, which could give a less “damped” operation.
Wait till the temperature drops & see if it becomes less slammy :?
Rob
 
If the cylinders are designed properly they would have a last moment slow down port built into the piston to cushion the end of travel.
I think at the point of closing there is simply too much weight at that leverage for the cylinder to cushion the blow.
https://www.cylinder.co.uk/technical/hydraulic-cylinder-types.html
 
Mine won't open currently (need to get it booked in when I get a chance) so complete lack of thunks and my neighbor thought it was a Coupe until I explained my roof mechanism is stuffed :D
 
Thanks all, everything works ok (that will be the kiss of death :D ) maybe I am just noticing it more these days
 
Mine actually twists slightly in 30c heats we’ve had, it results in the rear clamshell not sitting perfectly while
Closing on one side. Like 3mm difference. The final closing clamps making a loud clunk as it pulls the roof down against the deck. Never bothered with it as it’s so fiddly to adjust and it’s not every day we have 30c heat.

I have warranty if it ever goes bang. These cars are just so well designed and built.

#SarcasticQuoteOfTheDay
 
Should nearly discuss how reliable something is.
I did that this morning about aero engines.

Then later on today had an engine failure on takeoff and had to force land back onto an alternate runway.
Hole in one of 4 cylinders, 25% drop in power, just enough for level flight at 200 feet.
Fun day.
 
flybobbie said:
Should nearly discuss how reliable something is.
I did that this morning about aero engines.

Then later on today had an engine failure on takeoff and had to force land back onto an alternate runway.
Hole in one of 4 cylinders, 25% drop in power, just enough for level flight at 200 feet.
Fun day.
Click to expand...
Sounds like a pretty exiting day., In an underpants wrecking kind of way. :o
 
buzyg said:
flybobbie said:
Should nearly discuss how reliable something is.
I did that this morning about aero engines.

Then later on today had an engine failure on takeoff and had to force land back onto an alternate runway.
Hole in one of 4 cylinders, 25% drop in power, just enough for level flight at 200 feet.
Fun day.
Click to expand...
Sounds like a pretty exiting day., In an underpants wrecking kind of way. :o
Click to expand...

Yes and hour before that a near miss requiring me to climb rapidly, exciting day.
 
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