MANUAL GEARBOX DIESEL FLUSH

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lrjohn

Active Member
Posts
138
Location
Suffolk
So thanks to a split gearchange cover gaiter I have drained what looks like milkshake from my Discovery 2 gearbox, the vehicle is new to me so how long it has had oil contaminated with water in it I don't know, I suspect quite some time.
Thankfully one of our great contributors to this site pointed me in the direction of the gaiter otherwise I would have never guessed that was the culprit!
Other contributors have suggested flushing the gearbox with gear oil, i.e. refilling it running it for a few good few miles, draining and filling again, and possibly a further round of fill and drain. However, I'm not sure how much horrible sludge might be in there and I have been reading up about flushing manual go boxes with diesel (or kerosene), obviously not running the vehicle but simply filling the gearbox, letting it soak a while, and then draining.
There seems to be a lot of different opinions about this on the net, some saying it's a great option other saying don't do it. If anybody has experience of this it will be great to hear from them?

Thanks in advance
 
So thanks to a split gearchange cover gaiter I have drained what looks like milkshake from my Discovery 2 gearbox, the vehicle is new to me so how long it has had oil contaminated with water in it I don't know, I suspect quite some time.
Thankfully one of our great contributors to this site pointed me in the direction of the gaiter otherwise I would have never guessed that was the culprit!
Other contributors have suggested flushing the gearbox with gear oil, i.e. refilling it running it for a few good few miles, draining and filling again, and possibly a further round of fill and drain. However, I'm not sure how much horrible sludge might be in there and I have been reading up about flushing manual go boxes with diesel (or kerosene), obviously not running the vehicle but simply filling the gearbox, letting it soak a while, and then draining.
There seems to be a lot of different opinions about this on the net, some saying it's a great option other saying don't do it. If anybody has experience of this it will be great to hear from them?

Thanks in advance
Have a good read of this:
https://www.machinerylubrication.com/Read/864/flush-gearbox
 
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The r380s run well with automatic transmission fluid in them. Like a dexron 2. These oils have a lot of cleaning additives and are cheap so make good flushing oils, you could drive the car a few days to make sure everything is washed out.
 
Thanks for the comments and suggestions, sorting through my garage I find I have some Dexron which I had for a previous vehicle and had forgotten about. Given that I have it a sensible choice seems to run it with that for a while on Dexron, drain and then refill with MTF.

The opinions on using diesel/kerosene to flush seem too divided to take a risk on it!
 
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