Quote:
Originally Posted by Ripmax
Other than jacking all four wheels up or testing it on ice, trying to spin the prop by hand is really the only way.
The hand test will only reveal if the collar is completely stripped though, which may not be the case. I'd go with, if the car is 250K+ miles, assume the collar has seen better days.
These cars are FWD most of the time, then the AWD kicks in when slip is detected. Although some models (I know the R's do) will preemptively engage the Haldex clutch under acceleration/cornering.
However, it's unlikely that the car had ever been used in a situation where the AWD is needed so the collar has probably never been under any considerable amount of stress. Especially with the auto models being torque limited in 1st & 2nd gear.
Further to this, something I didn't consider when writing is, that if the front wheels are turning the propshaft will be driven by the angle gear too so this doesn't work at all as a test.
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Thanks for your valuable input.
Does it mean that there is absolutely no power going to tear axle in normal driving conditions? Some cars can be like 70-30 or 60-40 power distribution?
Are the XC70 similar or they are permanent awd?
The V70 used the haldex , something similar to what they have in VW Passat 4motion , front wheel drive all the time unless loss of traction is detected then drive can be sent to the rear axle to restore stability , then its off again