| Author | Message | ||
     David Hill (Davidh) New Member Username: Davidh Post Number: 3 Registered: 11-2003 |
I've had my 1991 Disco for two years and after buying it, I had to return to the dealer to have the bottom end rebuild as it was burning excessive oil. I wasn't given too much detail but basically I think the rings were done and some bearings, the bare minimum for a warranty job. The motor has always made a sound like a diesel motor, before and after the bottom end rebuild. If it hasn't been driven for a while, the noise isn't there on startup, but after 10-15 seconds the noise starts. It's kind of a rattling noise. I've had various mechanics look at it, even one LR dealership that hadn't heard a motor like that in all of their 40 years experience! Some suggestions were gudgeon pins. The rocker gear was replaced temporarily with another set with no difference, and it was concluded that it wasn't the lifters. Could it be the cam? Any thoughts? | ||
| Leslie N. Bright (Leslie) Dweb Lounge Member Username: Leslie Post Number: 3023 Registered: 02-2002 |
So why would you have bought a vehicle that sounded that bad in the first place? Sounds like it'd have been simpler and more cost-effective in the long run to have done an engine swap instead of rebuilding it, maybe a couple of times (sounds like it may need another rebuild if you're sticking with this block). How'd you get a warranty on a vehicle that was 11 years old at the time? Cam, grudgeon pins, sure, those are possibilities. I couldn't say, via the description. Could even be more sinister, like a slipped sleeve of one of the cylinders. I'd consider swapping in another engine. Or, at least consider pulling it and doing a complete rebuild through a shop that'll guarantee the work. ------- A thought: Are you positive that it's in the engine? There was a Defender in the shop that had a growling sound, that was coming from the transmission.... it lost two forward gears, would only go into the other gears, but would constantly growl, a rattling kind of growl. -L | ||
| Geoff 93 RRC (Geoff) Member Username: Geoff Post Number: 230 Registered: 11-2002 |
Could be the exhaust. I changed my y pipe recently and some diesel-ish sounds went away and others appeared. The cam can rattle around too, kind of a knocking, as the timing chain stretches with age and lets the cam move forward and back. I get this occaisionally (120K miles on motor). | ||
| David Hill (Davidh) New Member Username: Davidh Post Number: 4 Registered: 11-2003 |
Leslie, in hindsight I should have thought twice when the motor didn't sound right. One of those stupid decisions you make in life sometimes! Fortunately I didn't pay for the rebuild as the dealer took care of that. So it hasn't cost me anything yet, and hasn't really caused any problems yet, apart from the noise and the oil consumption which is more likely the valve stem seals. The car is complianced as a 4/92 even though it was built in 8/91. Bought it in 2002 so it was just under 10 years old at the time. It was a very limited warranty. Any older, and it wouldn't have been available. The cam is a likely problem as suggested by Geoff, and it has done 198,000 klms. Currently I might let it be and see how long I can get out of it before it really gives up. Though I've been told if I want to re-use the block, it might not be possible if I let it go. | ||
| Leslie N. Bright (Leslie) Dweb Lounge Member Username: Leslie Post Number: 3036 Registered: 02-2002 |
I can completely understand the 20/20 hindsight thing.... I'm constantly looking back and going "Doh!"..... Since prices vary from market-to-market, and also depends on who you know, etc., I would investigate the price of getting a nicely built replacement engine, and start setting that money aside so that when the time comes you can jump on it and get it back on the road w/o having to wait on finances (at least, in my situation, it'd have to sit 'til I could juggle the funding around). If the price of a new engine is out of the range of the wallet, then look at getting the rebuild done sooner, before it does go.... I concur, it may let go and not be of use before long. With my luck, I'd tear it down to rebuild and discover that it's already to the point that you couldn't rebuild it and I'd have to hunt down another block for the rebuild, sigh.... Anyway, best o' luck to ya, hopefully you'll get it sorted out w/o it being too dear.... -L | ||
| gokay korcum (Gokay) New Member Username: Gokay Post Number: 3 Registered: 02-2004 |
dear dave ,i hv the same 1991 , v8i engine with lucas electronics. you say you hv the rings changed but if the piston itself is ruined the ends of these pistons touch the cylinder itself to make such noices. on the other hand, when you renew an engine ,this must be for the whole , that is the cams,camshaft,valves, piton and cylinder borings and arm and main bearings. otherwise the repair never last long ,i.e . if the head is repaired it gets stronger to riun the rings,piston and crankshaft bearings. hope this helps |
