79 series cabin noise

Submitted: Sunday, Aug 22, 2021 at 19:24

ThreadID: 142433 Views:5051 Replies:8 FollowUps:8

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JL7T9

So we have been going through a process of eliminating the wind noise today coming from our 79 with 10,000km. during the week I put a post out regarding the roof rack wind noise from the rhino rack platform to see if other people had issues . Today I removed the rack and still getting the wind noise coming in I believe near the A pillar. Without doubt I’ll be the 1st to agree the 79 isn’t the most aerodynamic car with flat windscreen, snorkel big mirrors ect, and have read all the reviews on 79’s as the tend to have a bit of wind noise. but did have it fully sound detened to help. One of my door seals on the driver side looks a little squashed on the corner but the wind swooshing noise is from both sides. Just asking any other 79 owners about the wind noise in their cab at from around 70+km not sure if it is the Msa mirrors, door seals or if it’s just part and parcel of the brick shaped car. Love to hear if it’s standard on all 79’s as a mate with a single cab doesn’t seem to have issues, I also had the windscreen replaced at 5000km due to a crack with a non genuine. I have read if the polyurethane has sealed properly the swooshing noise will come in. I have taped over the seal to see if it is not sealing properly but still seems to come in. Really just wanted to see if other owners have the same wind turbulence noise.

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Reply By: RMD - Sunday, Aug 22, 2021 at 20:41

Sunday, Aug 22, 2021 at 20:41

JL7T9
Obviously the rack isn't the problem if no change. Have you used a piece of thin dressmakers "bias binding, ie cloth tape, and with the windows down, doors closed, have the tape dragged out and in , while passing along the door frame. That will ID where a rubber seal isn't touching much at all. You mentioned "sound detened" ! Do you mean sound deadened?
You also have read, " if the polyurethane has sealed properly you will get noise. I would think the opposite applies, where, If you have had a screen replacement and it HASN'T sealed then noise will certainly be a problem as it is a high pressure area sealed from inside the cab.
I would also check if the window glass, both sides, are seating squarely in it's Bailey channel. If not and there are unseen gaps at edge of glass OR in the corners there may be a misfit and some filling with a dob of flexible sealant may be sufficient. Wax or grease glass in that area during curing so it doesn't stick shut. Cling film also works. I had a HJ61 and both doors required the window frames slightly bent inward to create proper door seal closure. Slightly that is! Bailey channel also needed repair.
The snorkel won't help as it does create turbulence at the pillar. Any vacuum created at the pillars will suck out past the door rubbers so attention to detail is required.

AnswerID: 637623

Follow Up By: JL7T9 - Monday, Aug 23, 2021 at 08:07

Monday, Aug 23, 2021 at 08:07

Thanks for the info, I have a couple of mistakes as you picked up. Correct I have the entire car deadened. I will contact the company who installed the new windscreen to see if they can reseal with the polyurethane. In the mean time I will check the door seal clearance with your technique.

FollowupID: 915706

Reply By: tonysmc - Sunday, Aug 22, 2021 at 21:42

Sunday, Aug 22, 2021 at 21:42

Maybe take it through an auto car wash and see where/if any water gets in or alternatively have someone sit inside while using a gerni around the outside and see where water comes in?
If you hadn't said the noise is both sides I would have tipped the snorkel as I remember friend had one fitted and the noise afterwards was shocking although I know there a hundreds of car with them that don't have a problem. His use to resonate right through the whole dash.

AnswerID: 637624

Follow Up By: JL7T9 - Monday, Aug 23, 2021 at 08:09

Monday, Aug 23, 2021 at 08:09

Definitely have no rain coming through the seal with normal rain but will check with high pressure hose.

FollowupID: 915707

Reply By: Member - David M (SA) - Sunday, Aug 22, 2021 at 22:53

Sunday, Aug 22, 2021 at 22:53

If the snorkel is facing strait ahead try moving it a couple of degrees left or right. Used to be a problem a few years ago.
Dave.

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AnswerID: 637625

Follow Up By: JL7T9 - Monday, Aug 23, 2021 at 08:11

Monday, Aug 23, 2021 at 08:11

Thanks Dave, will give the snorkel intake a turn a see if it changes the turbulence. Another person has said the gutter either side of the windscreen creates noise.

FollowupID: 915708

Reply By: rumpig - Monday, Aug 23, 2021 at 06:31

Monday, Aug 23, 2021 at 06:31

Get dynamat installed inside the doors, makes a big difference to the road noise you’ll hear. My vehicle got done when I had a new stereo installed, it’s only had the doors done (some people do floors and roof also, but that’s a lot of weight added to the vehicle) and the difference was very noticeable.

AnswerID: 637626

Follow Up By: JL7T9 - Monday, Aug 23, 2021 at 08:14

Monday, Aug 23, 2021 at 08:14

Thanks for the info, had the entire cab,roof, doors deadened pre rego with a few different products like you said the dynamat in doors and few other products in headlining

FollowupID: 915709

Reply By: Member -Pinko (NSW) - Monday, Aug 23, 2021 at 08:12

Monday, Aug 23, 2021 at 08:12

My 79 was noisey+++. The gap between the A pillar and snorkel fixed wth a section of commercial ac pipe insulation (looks like pool noodle) stuffed into the gap. No turbulence noise. Cabin noise cured with Dynamat. Completly stripped out the cab including the ceiling lined the cab with Dynamat, doors as well. No outside noise at all. Doing the ceiling cures rain noise on the roof which is sometimes deafening.
Stan

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AnswerID: 637627

Follow Up By: JL7T9 - Monday, Aug 23, 2021 at 09:31

Monday, Aug 23, 2021 at 09:31

Thanks Stan good to know I’m not the only 79 owner who has had noise. Had all the cabin installed with dynamat and has made huge difference. My noise is a turbulence noice at the 80+km. I will try the foam between the a pillar and the snorkel.

FollowupID: 915710

Reply By: Member - McLaren3030 - Monday, Aug 23, 2021 at 08:18

Monday, Aug 23, 2021 at 08:18

May be a “silly” suggestion, but on the 200 Series there are two different windscreens, one for the petrol version and one for the diesel version. The diesel version is an “acoustic” windscreen. Not sure if there is any difference with the 79 Series windscreens, but as you have replaced your windscreen with a non genuine windscreen, perhaps this may be the issue.

Macca.

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AnswerID: 637628

Follow Up By: JL7T9 - Monday, Aug 23, 2021 at 09:32

Monday, Aug 23, 2021 at 09:32

Thanks Macca, I will have a chat to the windscreen supplier thanks for your information

FollowupID: 915711

Reply By: Nifty1 - Tuesday, Aug 24, 2021 at 13:31

Tuesday, Aug 24, 2021 at 13:31

Not a 79, but I spent hours tracing a wind whistle in my Hilux. Taped up windows and doors, removed snorkel head, taped up every protuberance I could find - no change. Then I pushed the aerial down. Instant fix!

AnswerID: 637635