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Old 05-08-2019, 03:01 AM   #1
tomasss
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Default Hydraulic engine mounts compression

I ordered a PU engine mounts as a replacement of my old leaky hydraulic engine mounts.
What is surprising for me is that the hydraulic engine mount height is 10.4cm while the PU mount is 86mm only.
That is almost 2cm difference.
The only thing I can think of is that the hydraulic mount will collapse a bit when the engine weight is pressing it down...but can it make those 2cm's?

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Old 05-08-2019, 06:38 AM   #2
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Knowing where you ordered those from you most likely have to add spacers to make them work
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Old 05-08-2019, 04:11 PM   #3
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Any experience with these classicswede?

Actually I think that the theory with the pneumatic mounts compressing under engine load is not valid.

The reason why I think so: there are these steel wires going around the mount, securing the top part of the mount to the bottom of the mount even if the mount has already degraded completely.

I remember how loose those wires were when the engine was still in the car. And now those wires are almost as loose as before. There is no way that the mount extended it's length by 18mm...
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Old 05-10-2019, 04:39 PM   #4
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Ok, after some more checks it really seems that the PU mounts height is correct...weird to me but confirmed from several independent suppliers.
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Old 06-08-2019, 03:29 PM   #5
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Well..unfortunately it seems that the PU mounts from retro turbo are really too low.

This is what I found when I crawled under the car today to check the oilpan to crossmember clearance the paint on the oil pan is even slightly wrinkled from the engine weight pressing it against the crossmember.

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Old 06-08-2019, 03:59 PM   #6
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I think my mounts are so blown it's the reason my IPD sway won't clear the oil pan!
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Old 06-10-2019, 04:44 PM   #7
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Perhaps those PU mounts are meant for solid engine mount brackets?
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Old 06-11-2019, 04:01 AM   #8
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Quote:
Originally Posted by bmos View Post
Perhaps those PU mounts are meant for solid engine mount brackets?
Well...not according to the retroturbo website
http://www.retroturbo.com/?product=p...-16v-b234-b204
There the picture clearly depicts the mounts that I have in the car.
Trying to check with retroturbo sales but they are not responding to me already for almost a month
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Old 06-11-2019, 05:32 AM   #9
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I did this to use 240 solid mounts onto 940 brackets. A similar idea might work for you.


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Old 06-11-2019, 06:18 AM   #10
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Yup. I am not missing that much height as you, so I am thinking of adding like 5mm shims on three places: between the crossmember and the solid mount, between the solid mount and PU mount and then between the PU mount and the engine. That would give me around 15mm gap.
But yeah...the idea was that it will be plug&play...

Last edited by tomasss; 06-11-2019 at 06:23 AM..
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Old 06-11-2019, 06:57 AM   #11
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I think I see the issue.
Their website says their mounts are a direct replacement for Volvo OE part number 3514485 and to ensure that this product matches your existing mounts.

Your photo shows a mount with part number 3514487. I found only one reference to 3514485 which shows LH (left hand?) so see if that number is on your left side mount. Obviously if the left mount is 3514485 then they have screwed up their design but if it's different they might be unaware of some different mounts that B204GT came with.
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Old 06-11-2019, 07:41 AM   #12
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Well, they call their product "Volvo 740 940, 16V Pro Engine Mounts for B204GT (PRT)" so it should be compatible with B204GT right
The engine mount numbers I have already checked before, one had 3514487 stamped on it and the other one had 3514485. Seems that the first one has been replaced at some point as it looks less rusty, but other than that they look exactly the same, and also on the Volvo web they look exactly the same:

https://www.volvopartswebstore.com/p...6/3514485.html
https://www.volvopartswebstore.com/p...3/3514487.html
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Old 06-15-2019, 06:55 AM   #13
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Quote:
Originally Posted by tomasss View Post
Well, they call their product "Volvo 740 940, 16V Pro Engine Mounts for B204GT (PRT)" so it should be compatible with B204GT right
The engine mount numbers I have already checked before, one had 3514487 stamped on it and the other one had 3514485. Seems that the first one has been replaced at some point as it looks less rusty, but other than that they look exactly the same, and also on the Volvo web they look exactly the same:

https://www.volvopartswebstore.com/p...6/3514485.html
https://www.volvopartswebstore.com/p...3/3514487.html
Sounds like they sold you a bill of goods then, obviously your mounts are the ones these are supposed to replace but something went wrong in the production process or something. The bracket previously posted would do the job although I'd explore the idea of making new shackle-type engine mounts as they will control engine movement much more completely.
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Old 06-17-2019, 07:03 AM   #14
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The 16v part explains it. The length is about right for 8v, the either sent you the wrong ones or just make them wrong

I can do one off mounts to the length you want
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Old 06-23-2019, 09:31 AM   #15
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Well, I am not sure about the height. The guy from retroturbo is stating that the height should be perfectly correct for 16v turbo 740, but apparently it is not. He said it was perfectly fine on his 940 with the same engine but as far as I know 940 never received this engine (960 did)...

Anyway...I really needed to solve this, so today I tried to play with some shims. Using some big flat washers I was able to lift the engine mount holder and also sandwich the shims on both sides of the PU mount so the engine is in exactly the stock position now





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