Good day all,
Long time reader, first time poster, and I want to thank this forum for a multitude of good answers and advice in the past!
For this question, I've done my research, and am still slightly stumped.
I have a 2005 Honda CRV (RD7), with 190k km on the clock. Over the last 10000km or so, there's been a slight hum coming (I'm pretty sure) from the rear, and sloooowly getting worse.
The specifics of the noise:
- It starts getting noticeable around 60km/h
- It peaks in volume around 70km/h
- It seems to get slightly attenuated from around 80km/h onwards
- It is worse when I have load in the rear (1-2 passengers)
- It's a really loud hum, filling the cabin, but with no specific rhythm to it
- I can't say for sure that it gets worse or better in turns
- About 20k km ago, I put a new set of Pirelli P7s on the rear. At the time, I wasn't aware that my rear suspension was in need of some work, and the tyres accordingly feathered.
- I replaced the rear shocks about 7000km ago, but the damage to the tyres had already been done.
- I have checked all the other recommended sources of noise, including flushing both the transmission and rear diff - this does not seem to have materially improved the noise.
- I've had the car for almost 3 years, and do an equal mix of city and highway driving.
- I'm in Brisbane, so salty air could be a concern. To the best of my knowledge though, the car has never done any beach driving.
- Also to the best of my knowledge, the car has never done any serious towing (or carried big loads), or gone proper offroading.
In summary, I can't for sure pinpoint the noise source to bearings (usual tests like spinning, tugging, cornering have inconclusive results). I also can't get any consistent idea of how long a set of bearings on the CRV should last. The tyres are definitely feathered (probably about 1-2mm ridges), but I have no idea how much noise they would contribute with all else being equal.
Based on a LOT of other posts on the net, service centre and mechanic opinions on this particular issue isn't always accurate, and unfortunately I don't have the money ($500/bearing installed, $150-200/tyre) to throw at the problem and hope for the best. I am probably skilled enough to install the bearings myself, but they're still $150 a side, and apparently on this particular model there's an issue with getting ABS sensors out of the hub without breaking them, which will add another $50-100 per side potentially.
Any advice would be greatly appreciated!