Engine clunks sometimes when accelerating after braking.

[02V70]

I noticed that there is a clunking noise when shifting between gears (PRND) and when accelerating from a stop. I also feel a vibration when accelerating, particularly when going up hill, but im not sure if it is a related problem.

I recorded a video of my engine moving as I move though the PRND gears and hold the brake. Is this indicative of bad engine mounts?

I already replaced the torque mount that connects the transmission to the subframe. The lower right engine mount seems "ok" but a little squished. The top one (in the video) seems loose, but the rubber is not worn, so maybe it is normal?

What other engine mounts are there, and how can I check them.

VolvoEngine.mp4

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[dikidera]

Yes the clunking is usually caused by bad engine mounts, specifically mostly lower torque rod and upper torque mount. If it's not the mounts it can be a very loose or entirely missing CV axle bolt that causes the driveshaft to slide in and out of the hub.

[Krons]

Yep, time to change the mounts.

[MoVolvos]

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Surprised at how much a difference an upper mount can make in the car. I've only changed 2 inserts previously and both were the round poly from IPD. One was for a 98 S70 T5 the other 03 S80 T6. The S70 was black while the S80 was the blue poly. Both cars experience a little more vibration and sound transmission into the cabin.

As for this current mount its turned into an experiment. From the pic you can see the mount had separated at the top and bottom so it's basically shifting from side to side in the mount. It's also deformed being the original with 150K miles. Vibration shakes the dash, glove box and makes the interior creak and squeak. There were also shifting clunks and bumps as the transmission go through it's paces shifting up and down. Lifting the throttle also produced some minor bump and clunks besides during braking. Thought this was just the S70 showing it's age or perhaps the front engine mount near the passenger wheel nearing collapse.

Decided to fill the mount with hot glue to see what the car would behave like with more of a solid mount. Like the poly the hot glue produced some vibration and sound transmission but the other noises including clunking, jolts in shifts and interior noise were all reduced substantially.

This experiment didn't last long as the hot glue melted and flowed out of the mount with engine compartment temp. Since the S60 is out of commission I referenced both FCP and IPD to confirm the square and round upper mounts are interchangeable for the S70 and S60. Perhaps it's the improved square design but the interior is serene compared with the broken and hot glue setup. Dash no longer rattles, shifts off the line is quick and the car interior, kind of hard to describe but like being in the cloud or pillowy as overall cabin sound is greatly reduced and isolated from the exterior. I'm pretty sure I won't go with the round poly seeing how even a used square design has isolate the interior from noise and vibration and made the driving characteristic so smooth and fluid.

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[dikidera]

My square one from Corteco and lower torque rod from Volvo genuine blue box(well blue bag) lasted no more than 5k km. Now they are both shot.

[MoVolvos]

My square one from Corteco and lower torque rod from Volvo genuine blue box(well blue bag) lasted no more than 5k km. Now they are both shot.

That would cause some clunk and odd shifting behavior for sure. Time to get some lifetime warranty parts and check the other mounts to see if they are the cultrips for hastening the demise of the other two.
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[dikidera]

All of them are new. Varying brands so not volvo, but I believe one of the two causes accelerated damage to the other. So a shot lower torqurod places a lot of strain on the top one and vice versa.
But also a problematic transmission that shifts oddly say jerking between P and R would also accelerate the damage.

No such thing as lifetime warranty in Bulgaria.

[MoVolvos]

No such thing as lifetime warranty in Bulgaria.

Are you also saying parts are cheap and cheap to buy .

[dikidera]

No they are not. A genuine volvo lower torque rod costs 1/5th or at best 1/6th the average salary of an unskilled worker(such as me).

[MoVolvos]

No they are not. A genuine volvo lower torque rod costs 1/5th or at best 1/6th the average salary of an unskilled worker(such as me).

Wow!
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