| Author | Message | ||
     Chris Brennan (Cdmbrennan) Member Username: Cdmbrennan Post Number: 44 Registered: 01-2003 |
Installed OME HD springs front and rear two weeks ago. LOUD "thunk" when shifting from Park to Drive or Drive to Reverse now and continuous chatter when driving. Took Disco I to dealer - wonders of wonders, they said nothing was wrong other than the driveline had to be adjusted as the angle was wrong. Dealer wouldn't touch and referred me to 4x4 place. 4x4 place said they had seen worse angles for the driveline. Noise is still very much there. Any ideas? | ||
| Chris Brennan (Cdmbrennan) Member Username: Cdmbrennan Post Number: 45 Registered: 01-2003 |
bump | ||
| Bill Ross (Billr) Member Username: Billr Post Number: 49 Registered: 11-2002 |
Would it be safe to assume that the dealer had to disconnect some of the suspension links to install the springs? Or is it possible that some of the bushings on those links were stressed during the installation? My bet is that you've got one of your links not torqued to spec or a bushing is a bit worn. Almost all of those attachments points require 130 ft/lbs and if they are not torqued down to that spec or if the bushings are a bit loose you could get a wee bit of slop that could result in a clunk. How do I know this possibility? I replaced my bushings with poly after my spring conversion on my RRC and I got weak (like only a 100 ft/lbs) on just one of my links and it created a pretty good "clunk" until I tracked it down and tightened it to spec. | ||
| Chris Brennan (Cdmbrennan) Member Username: Cdmbrennan Post Number: 46 Registered: 01-2003 |
Bill, That could very well be it. I was the installer - and novice at that. The sound is prevalent when driving as well - when the engine "downshifts" the gears grind into place. I'm betting that you're correct about the rattle due to loose bushings, but any idea on why it would clunk in and out of gear when driving? | ||
| Bill Ross (Billr) Member Username: Billr Post Number: 50 Registered: 11-2002 |
When you get in and out of the gas you have a torque shift in the driveline. That is, the axles will twist slightly in their mountings (its that physics stuff). If a suspension link or bushing isn't quite tight for some reason, that clearance will be taken up by the twisting of the axle housing (along with whatever clearance is in the actual gear interfaces within the driveline)creating a "clunk". Not so much on my Rovers other than what I had this last time, but I've had similar noises occur when shock or strut mounts were not quite tight on some of my other "normal" vehicles. The only thing that might pin it down more exactly is if you also hear a bit more noise when going over irregularites in the road surface. I have found that a loose piece seems to create a noise on smaller cracks, etc in the road versus those monsterous craters that we have here in Northern Ontario. Finally and this isn't the time of year that this helps much, but I've also had increased noise as a result of looseness in the suspension bits when its colder (but again, up here that mean -30C) Anyway, its easy to check. Just get a torque wrench out and make sure that anything that you took off or had to take loose or remove is tighten to spec. I know that most of the suspension link fittings (radius rods, etc.) are supposed to be tightened to 130 ft.lbs, which is a pretty fair amount (of course, I could just be getting old and weak) | ||
| Jason T. Barker (Speedminded) Senior Member Username: Speedminded Post Number: 281 Registered: 10-2002 |
Shouldn't have much torque shift if you are just shifting from Park to Drive. If the vehicles wheels are off the ground (hydraulic lift, jackstands, etc.) does it still clunk? Someone should get under the vehicle and locate where the noise is coming from exactly. Could it be a u-joint? The springs would lift the vehicle so that the u-joint angle would be differant. If it had any wear on it before the lift it may be exaggerated (right word?) at the differant angle. Chris, you said gears grind when it downshifts? I assume you're talking about gears in the transmission? | ||
| Shaun Power (Shaunp) New Member Username: Shaunp Post Number: 23 Registered: 05-2003 |
I'd have a look at the rear A frame ball joint and the uni-joints | ||
| Raf usher (Zonamaya) New Member Username: Zonamaya Post Number: 19 Registered: 05-2003 |
my lr does the same..sometimes when i change from drive to reverse, it makes a big clunk underneath. but it doesnt do it all the time. wut u think it could be? i havent done anything to it. | ||
| Chris Brennan (Cdmbrennan) Member Username: Cdmbrennan Post Number: 48 Registered: 01-2003 |
Bill, Jason and Shaun - many thanks. Been out of town since Friday but was pleased to come back to some good suggestions. I'm going to try first checking to see what everything is torqued to- I'm guessing that this could be it. There is a bit more rattle over potholes and the like. Funny thing is, when I've driven it offroad the past week or so, it seems to sound a lot quieter. Maybe it's just happier there... Regards, Chris |
