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1973 Series III '88 Petrol here. Coming up a hill yesterday, shifted down from 4th to 3rd gear, heard a not-too-loud "clunk" somewhere below and the Rover came out of gear. Was able to coast to the side of the road. I could not get any gear to engage. I turned off the Rover. Needless to say, putting in first gear and letting off the clutch the Rover would normally stay put, but it just started rolling backwards down the hill. The only thing to keep it from rolling was the brakes (emergency break isn't great), then a couple of blocks behind the rear wheels until tow service arrived. I started it back up with foot on the clutch, kept it in first gear and when I slowly let off the clutch I could hear a grinding sound about mid-ships. Any immediate thoughts on where I should begin? Hoping it's something uncomplicated... Thanks for any advice.
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It sounds like the clutch is functioning since you can depress the clutch and select a gear, and the grinding noise starts when you let out the clutch. I suspect the transfer case has popped out of High / Low range selection. With the truck not running move the red knob linkage fore and aft a few times to exercise the mechanism. Then try it with the engine running and clutch depressed.
I would also check for a broken U Joint on the driveshaft but that is less likely due to the stated noise. That is a repeated loud clunk when the truck moves. -
If you have an overdrive fitted check that it is not part way engaged.Comment
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"It sounds like the clutch is functioning since you can depress the clutch and select a gear, and the grinding noise starts when you let out the clutch."
I'm actually able to rifle through all of the gears without stepping on the clutch when the vehicle is not running. Clutch on or off, I can now wiggle the stick shift into any of the gears.
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Hi again. You nailed it with the "red knob linkage". It appears to have slipped all the way forward, but pulling it all the way back and the Rover is now functioning as it should once again. THANK YOU!!Comment
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OK, scratch the above. I am seeing that the red knob linkage should be fully forward for normal road driving, but with the red knob fully forward, the Rover will not move. When I pull the red knob fully back, I am able to put the Rover in gear and drive, but sounds like this isn't ideal. So, sounds like I still have an issue?Comment
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The red knob lever in the forward position selects Hi Range for normal driving, pulled aft it selects Low Range for more torque and crawling along, the aft position also automatically selects 4 wheel drive. The yellow knob when depressed selects 4 wheel drive when in Hi Range.
There was a great demo video on transfer case linkage function on a post on the old Guns and Rovers board. I'll see if I can find it. On my 109 the small sheet metal covers on the end of the transfer case covering the shift rods were all gummed up inside with dirt and old grease. That buildup prevented the rods from fully moving. I can try for a pic of my spare tomorrow.
What happens when you depress the yellow knob in Hi Range? Depressing the yellow knob should engage 4WD and send power to the front diveshaft.
Edit: Another possibility is a broken rear axle shaft. If an axle is broken (common problem actually) the rear driveshaft will spin and turn the differential, but with the open differential no power will be sent to the side with the good axle shaft. Selecting 4WD sends power to the front axle so the truck moves.....Comment
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