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200 Series General Forum for the Volvo 240 and 260 cars |
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Low-Pitched Whine At Slow SpeedsViews : 4666 Replies : 35Users Viewing This Thread : |
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Feb 28th, 2023, 23:48 | #21 |
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Interesting Bob, and thanks for the photos, they've all been really good
I noticed mine had excess thread on each end as well, and that when refitting the cross-member, the mount was the limiting factor, even when it had essentially maximum play... I may have to crawl under again and reinvestigate, making sure that the mount is actually sitting flush against the bracket and cross-member, although visibility is pretty poor in that area. I may have already put this, but I know that both mounts were the same width/diameter and thickness, yet the cross member was always a few mm out from being square (probably 10mm or 1/2"). I tested numerous times bolting each side in first. It didn't matter which side I bolted in first, it was always super easy (could tighten both bolts into the chassis ~80% by hand if not more. But always when trying to bolt up the other side, the cross-member was always that 1/2" from being square. Again, this was forced into place using a screwdriver as a lever and then starting the threads on the other bolt. Does that further point to engine shiftage at all (assuming the mount is flush on both faces of course)? The exact reassembly process was:
Finally, I was able to tighten the nut on the cross-member-side thread of the mount without needing a u-joint on the socket wrench - just a 15mm deep socket and 3/8" short extension. I was pretty sure I needed a u-joint in the removal process, but to be fair, I didn't actually check if I could get away without... Maybe this points more to the mount not being seated correctly? Maybe I'll try redoing the trans mount myself (with the correct part, and more knowledge on the process) as a first port of call given that'll be the cheapest option, and surely can't make the problem any worse as long as due care is observed?
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1990 Volvo 240 GL Auto "Catalyser" (oOOoh, fancy). B200F, about as original as they come, and all in BLOO. ~140k
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Feb 28th, 2023, 23:51 | #22 |
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Plenty of room: aw70 and a febi after market mount
Bob, you're missing a blind grommet that covers the hole in the crossmember. Stops it rusting out from the inside. |
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Feb 28th, 2023, 23:56 | #23 |
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Bicycle Boy, looks like you've also got the square mount in there (with the offset threads?)? Any advantage to attaching the mount to cross-member before bracket?
Also, agreed, there should be a rubber grommet covering that hole in the cross-member, I have yet to refit mine given it's barely going anywhere.
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1990 Volvo 240 GL Auto "Catalyser" (oOOoh, fancy). B200F, about as original as they come, and all in BLOO. ~140k
My electronics website/blog thing: https://unintegratedcircuit.wixsite....egratedcircuit Last edited by TheHungriestBadger; Feb 28th, 2023 at 23:57. Reason: Re: Grommet |
Mar 1st, 2023, 00:10 | #24 | ||
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Plenty of opportunity to get fresh with the wire brush and paint when everything is off. Did mine three months ago and look at the muck already. Last edited by BicycleBoy; Mar 1st, 2023 at 00:12. |
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Mar 1st, 2023, 08:08 | #25 | |
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After
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Mar 1st, 2023, 11:02 | #26 | |
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... and isn't necessarily obvious because the motor is pretty heavy. If that has happened it would certainly explain why you suddenly have a new noise. You could put a jack under the sump and see if the motor lifts without the car, or just see if you can move it around a bit with a pry bar. If this is a concern then get the engine mounts changed without delay. Good fortune, Abe
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... another lovely day in paradise. Last edited by Othen; Mar 1st, 2023 at 11:05. |
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Mar 1st, 2023, 11:42 | #27 |
Not an expert but ...
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I'd suggest that the misalignment at the gearbox end is easily explained by ageing engine mounts. I've always found these difficult to fit. They sag and distort with age, especially the one on the right underneath the oil filter. It is very difficult to avoid oil dripping on it when changing the filter.
Eventually the block comes apart from the plates, but even then it is hard to distinguish a slight sagging from total disconnection because the engine is so heavy. Once the engine has shifted position it requires a lot of heaving and leverage to move it, especially if both mountings have gone. Moving the gearbox end to replace its mount shifts the engine out of place. In the end I found it easier to unbolt the entire mounting brackets and then fit the new rubber on the bench. Bolt the mounting to the engine block first, then lower the engine a little and guide the bolts into the crossmember. |
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Mar 1st, 2023, 13:20 | #28 | ||
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Clifford is right that the easiest was is to undo the 3 nuts at the bottom of one of the mounts from the cross member and lift the engine up with a hoist: ... this was to remove the sump, but the principle is the same. Then remove the aluminium casting you can see here from the motor: Remove the whole assembly and change the rubber mount on the bench and replace. Then do the other side (don't undo both at the same time, that engine is really heavy!). It really isn't as difficult as it sounds. Abe
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... another lovely day in paradise. Last edited by Othen; Mar 1st, 2023 at 15:52. |
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Mar 2nd, 2023, 16:52 | #29 |
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Just took some pictures of the engine (looks like it's sagging slightly to me), and the engine mounts on both sides, would be grateful for your wise opinions.
Alternative Links: https://drive.google.com/file/d/1Mqg...usp=share_link https://drive.google.com/file/d/143C...usp=share_link https://drive.google.com/file/d/1fij...usp=share_link
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1990 Volvo 240 GL Auto "Catalyser" (oOOoh, fancy). B200F, about as original as they come, and all in BLOO. ~140k
My electronics website/blog thing: https://unintegratedcircuit.wixsite....egratedcircuit |
Mar 2nd, 2023, 17:17 | #30 |
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This is where the drivers side bracket is attached to the crossmember.
3 12mm nuts. Newly installed mount on pass side. Just to give an idea of how it compares to your old ones. Just did a visual inspection, they are still the same shape.(haven't quashed or settled.) They were done 3 years ago.
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Cowboy used to be a trade , now it means lack of one. Last edited by Bob 1967; Mar 2nd, 2023 at 17:29. |
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low pitch, noise, transmission mount, volvo 240, whine |
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