duncanm
Forum Member
- Joined
- Sep 7, 2014
- Messages
- 695
- Location
- Sydney
- Car Year
- 1998
- Car Model
- BH5 Outback. JDM Twin Turbo Conversion
- Transmission
- 5MT DR
So.. .
a concerning ticking that I've had from the drivetrain for the last 2-300km has developed (as I suspected it would) into a more alarming loud whirring during our recent 1000km round trip to the snowys.
Symptoms:
- started as a ticking noise.
- road speed (not engine speed)
- seems like its driveshaft speed (ie: significantly faster than wheel rotation, 4x is about right)
- does not vary with load, on/off gas, clutch in/out, selected gear or H/L range.
- has developed into a louder whirring noise with a background tick. Quieter when first driving (cold gearbox oil?)
- I pulled the drain plug when it was a ticking noise - nothing significant on the sump plug.
So I suspected something in the final drive - diff (front or rear), tail shaft carrier bearing, etc.
I've just had the car up on stands in gear, and think I've isolated the noise (with a tent pole pressed against various parts of the gearbox) to the transfer case, possibly the bottom rather than the top.
The fact that the noise is now a whirring, doesn't change with load, and the lack of chunks in the oil, suggests to me its a (non-thrust) bearing rather than a chipped gear - something like 24, 26, 28, 32 in the attached.
Anyone have any experience/knowledge of common failures in this area, or do I just need to pull the transfer case off and poke around ?
Gearbox has done about 250k
I'm thinking I just need to order all the bearings, pull the transfer case and replace them. It'll be no loss if this isn't the problem.
a concerning ticking that I've had from the drivetrain for the last 2-300km has developed (as I suspected it would) into a more alarming loud whirring during our recent 1000km round trip to the snowys.
Symptoms:
- started as a ticking noise.
- road speed (not engine speed)
- seems like its driveshaft speed (ie: significantly faster than wheel rotation, 4x is about right)
- does not vary with load, on/off gas, clutch in/out, selected gear or H/L range.
- has developed into a louder whirring noise with a background tick. Quieter when first driving (cold gearbox oil?)
- I pulled the drain plug when it was a ticking noise - nothing significant on the sump plug.
So I suspected something in the final drive - diff (front or rear), tail shaft carrier bearing, etc.
I've just had the car up on stands in gear, and think I've isolated the noise (with a tent pole pressed against various parts of the gearbox) to the transfer case, possibly the bottom rather than the top.
The fact that the noise is now a whirring, doesn't change with load, and the lack of chunks in the oil, suggests to me its a (non-thrust) bearing rather than a chipped gear - something like 24, 26, 28, 32 in the attached.
Anyone have any experience/knowledge of common failures in this area, or do I just need to pull the transfer case off and poke around ?
Gearbox has done about 250k
I'm thinking I just need to order all the bearings, pull the transfer case and replace them. It'll be no loss if this isn't the problem.
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