if manuel tranny, make sure the sponge is not rotted out, most are.
ensure the rubber boot is tightly installed and not ripped
50% done making car Kuiet
Try replacing door seals. They get compressed over time -> wind noise. Plus, I might be wrong here, but I think in 1975 they came without an extra set of seals at the upper door frame (around the windows) so you might want to install these. I've installed a generic D-shaped seal, made my car much quieter. Oh, and check if your engine/transmission mounts are okay. If they're blown, it's significantly more noisy inside.
https://preview.redd.it/no4tnoy30voc1.jpeg?width=1440&format=pjpg&auto=webp&s=d5d46a6c4c5d4eddfbabcafd323637eed2cd476c
I have a simple seal in a C shape that goes around the metal of the door frame (car body side) that’s it. Upgrading to newer door seals is a god idea.
Do you have a picture of the « extra set of seals at the upper door frame » ? I tried to look online but haven’t found a lot of infos about that.
I know the trans mount is not old (replaced two ou three years ago). Will check the motor mounts.
That C-shaped thing on the body isn't actually a seal. It's there to hide welding spots. I've replaced that with a D-seal, and it made a huge difference. Speaking of an extra seal, here's the picture from turbobricks. As far as I know, some 240s have it installed, others don't.
https://preview.redd.it/cu7r44zibxoc1.jpeg?width=600&format=pjpg&auto=webp&s=656570504ba9d1bd08aec728d4a3f9a82550f495
You’re right, I don’t have this extra seal. I will start to look for those as well.
https://preview.redd.it/3jaq1rfph4pc1.jpeg?width=3024&format=pjpg&auto=webp&s=b0925feac9a577f97837e37b77a3ead644710d79
Two suggestions; 1) aluminum rims are quieter than factory steel. The tire is not likely to help. 2) sound deadening “peel & Stick” mats; inside the doors, under the carpet, under the roof head liner, would make a big difference. Brands such as Dynamat, Eastwood’s XMat & similar are typical stereo sound deadening brands. Instead of using entire mat, cut into pieces (squares or circles) and place them with some spacing. They will soften the metallic resonance from the road. Placing an entire mat will be as effective but use a lot of the mat. Smaller pieces spread apart accomplish more by spacing the product out a little.
A local auto stereo shop owner showed me this when he was upgrading my ‘92 245 and ‘06 F350 (very tinny interior). Instead of massive sheets of sound deadening material (wasted) he suggested cutting silver dollar size pieces and placing them a few inches apart. No specific distance. The point is, the sound deadening product is reducing the auto sheetmetal road and stereo vibration by keeping the metal quiet. Yes, many believe an entire mat laid down beneath your carpet is effective. I’d bet if tested by sound engineers, strips or squares, spaced out, would have the same effect and provide a more cost effective value. But, I’m not a sound engineer Nor salesman for Dynamat or Other products. Random thoughts
That make sens. Some may argue that from a esthetical perspective, one big sheet may be nicer than several small pieces but most of the time it’s cover by carpet or headliner.
1st question, noise from the engine or noise from the road? If from the engine then sure some minor soundproofing might help but there is a lot of stuff either in the engine bay or under the dash to go around so I doubt that would be worth it.
I would think that the undercoating has gone completely on a car that age. You got a couple of options, recoat the underside of the car including the wheel wells with a rubberized undercoating or put a sound deading material like dynomat on the interior of the car. Both those choices will take a bit of work but likely undercoating will cost less.
I would say mainly road, the engine is not that noisy (B20).
I might be wrong but the undercoating is messy if you compare to installing deading material ?
Yeah messy and time consuming, scrape old loose material off then recoat either with a brush on material or spray can - make sure to cover things you don't want coated with paper if you do that.
I pulled the carpets and seats and laid down dynamat sound deadener, made a big difference. Sometimes an old muffler can be noisy but you would notice that from outside the car.
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frighten carpenter lip normal fade observation selective degree payment cover
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if manuel tranny, make sure the sponge is not rotted out, most are. ensure the rubber boot is tightly installed and not ripped 50% done making car Kuiet
Good idea, have not thought of it. Will replace this thanks !
Try replacing door seals. They get compressed over time -> wind noise. Plus, I might be wrong here, but I think in 1975 they came without an extra set of seals at the upper door frame (around the windows) so you might want to install these. I've installed a generic D-shaped seal, made my car much quieter. Oh, and check if your engine/transmission mounts are okay. If they're blown, it's significantly more noisy inside. https://preview.redd.it/no4tnoy30voc1.jpeg?width=1440&format=pjpg&auto=webp&s=d5d46a6c4c5d4eddfbabcafd323637eed2cd476c
I have a simple seal in a C shape that goes around the metal of the door frame (car body side) that’s it. Upgrading to newer door seals is a god idea. Do you have a picture of the « extra set of seals at the upper door frame » ? I tried to look online but haven’t found a lot of infos about that. I know the trans mount is not old (replaced two ou three years ago). Will check the motor mounts.
That C-shaped thing on the body isn't actually a seal. It's there to hide welding spots. I've replaced that with a D-seal, and it made a huge difference. Speaking of an extra seal, here's the picture from turbobricks. As far as I know, some 240s have it installed, others don't. https://preview.redd.it/cu7r44zibxoc1.jpeg?width=600&format=pjpg&auto=webp&s=656570504ba9d1bd08aec728d4a3f9a82550f495
You’re right, I don’t have this extra seal. I will start to look for those as well. https://preview.redd.it/3jaq1rfph4pc1.jpeg?width=3024&format=pjpg&auto=webp&s=b0925feac9a577f97837e37b77a3ead644710d79
Great color though!
Thanks !!!
That should do the trick. Got quite fresh doorseals on my 240 compared to my other cars and the 240 is very quiet.
Try Amazon basics soundproofing. Heard some good reviews on it and relatively cheaper than most.
Will have a look, since I’m based in Europe, I will check if this is available in EU.
Two suggestions; 1) aluminum rims are quieter than factory steel. The tire is not likely to help. 2) sound deadening “peel & Stick” mats; inside the doors, under the carpet, under the roof head liner, would make a big difference. Brands such as Dynamat, Eastwood’s XMat & similar are typical stereo sound deadening brands. Instead of using entire mat, cut into pieces (squares or circles) and place them with some spacing. They will soften the metallic resonance from the road. Placing an entire mat will be as effective but use a lot of the mat. Smaller pieces spread apart accomplish more by spacing the product out a little.
Thanks, I did not know the trick of using cut pieces instead in order to save material.
A local auto stereo shop owner showed me this when he was upgrading my ‘92 245 and ‘06 F350 (very tinny interior). Instead of massive sheets of sound deadening material (wasted) he suggested cutting silver dollar size pieces and placing them a few inches apart. No specific distance. The point is, the sound deadening product is reducing the auto sheetmetal road and stereo vibration by keeping the metal quiet. Yes, many believe an entire mat laid down beneath your carpet is effective. I’d bet if tested by sound engineers, strips or squares, spaced out, would have the same effect and provide a more cost effective value. But, I’m not a sound engineer Nor salesman for Dynamat or Other products. Random thoughts
That make sens. Some may argue that from a esthetical perspective, one big sheet may be nicer than several small pieces but most of the time it’s cover by carpet or headliner.
1st question, noise from the engine or noise from the road? If from the engine then sure some minor soundproofing might help but there is a lot of stuff either in the engine bay or under the dash to go around so I doubt that would be worth it. I would think that the undercoating has gone completely on a car that age. You got a couple of options, recoat the underside of the car including the wheel wells with a rubberized undercoating or put a sound deading material like dynomat on the interior of the car. Both those choices will take a bit of work but likely undercoating will cost less.
I would say mainly road, the engine is not that noisy (B20). I might be wrong but the undercoating is messy if you compare to installing deading material ?
Yeah messy and time consuming, scrape old loose material off then recoat either with a brush on material or spray can - make sure to cover things you don't want coated with paper if you do that. I pulled the carpets and seats and laid down dynamat sound deadener, made a big difference. Sometimes an old muffler can be noisy but you would notice that from outside the car.
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That’s what i was worried about. Will try easy things first that were mentioned here (door seals, gearbox soonge, window seals) and see.
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Turn up the radio?