| Author | Message | ||
     James Newman (Lr_disco_i) Member Username: Lr_disco_i Post Number: 55 Registered: 03-2003 |
Hello I have a 98 Disco 4.0 V8... It seems that the vavles on the left bank have developed a kind of chattering.... (when I say left I mean left from me looking in at the front of the LR) now the valves on the right bank are as quite at a mouse but I can hear the valves from the left bank from the passenger front wheel well.... is this normal? I dont think it was there whaen i got it.... or is something up? Thanks very much, James | ||
| Brad Noviski (Bradnoviski) New Member Username: Bradnoviski Post Number: 33 Registered: 02-2003 |
Is it the valves or a worn rocker shaft? From what I have read, worn rocker shafts are common. | ||
| James Newman (Lr_disco_i) Member Username: Lr_disco_i Post Number: 57 Registered: 03-2003 |
dunno all i can hear is like a noise like someone teeth chattering.... really fast.... but only from one bank | ||
| Jonathan Hensel (Nanoscale) Member Username: Nanoscale Post Number: 58 Registered: 03-2003 |
Sure it's valves? Not a leaky exhaust manifold or gasket? Take a 3 foot piece of garden hose, put up to your ear like a stethoscope and track down exactly where it's coming from. Find the throttle linkage and rev it up while your there listening around. Valve tap is more of a "clack clack clack" where exhaust tends to be more of a "snip snip snip" sound.... | ||
| James Newman (Lr_disco_i) Member Username: Lr_disco_i Post Number: 58 Registered: 03-2003 |
well i put my hand round the manifold to feel for any leaks....i did not feel any.... and i reved the engine from the linkage | ||
| Brad Noviski (Bradnoviski) New Member Username: Bradnoviski Post Number: 35 Registered: 02-2003 |
How many miles on the truck. the left bank (faceing the engine)of mine make a noise like you discribe. I know it is not the valves or the exhaust or intake manifolds because I just had a valve job done about a month ago. When it gets to the point I gat stand it any more I will replace the rocker shaft. | ||
| Brad Noviski (Bradnoviski) New Member Username: Bradnoviski Post Number: 36 Registered: 02-2003 |
How many miles on your truck? Any fault codes? | ||
| James Newman (Lr_disco_i) Member Username: Lr_disco_i Post Number: 59 Registered: 03-2003 |
No fault codes.... just passed the 50k mark | ||
| Brad Noviski (Bradnoviski) New Member Username: Bradnoviski Post Number: 39 Registered: 02-2003 |
is it under warrenty still? If so take to the dealer. | ||
| James Newman (Lr_disco_i) Member Username: Lr_disco_i Post Number: 61 Registered: 03-2003 |
lol well I need to diagnose before I take it to the dealer..... they can never find anything... I have 4" of play in my steering and they said it was normal....lol | ||
| Reid Walkenhorst (Runningmule) New Member Username: Runningmule Post Number: 4 Registered: 05-2003 |
Welcome to the wonderful world of Land Rover. My DII 4.0 has chattered since day one. Synthetic oil (Mobil 1 5-30) helps but???? Mine will run nice and quiet for about 1 week after a fresh oil change, but then it starts again. I figure it's just part of life. | ||
| Brad Noviski (Bradnoviski) New Member Username: Bradnoviski Post Number: 40 Registered: 02-2003 |
4" of play is not normal. I have a 96 with 74k and the sterring is nice and tight. Where are you located? Are there any other dealers or local shops around? Dealers love warranty work, they make good $$ from it because they back charge LRNA | ||
| James Newman (Lr_disco_i) Member Username: Lr_disco_i Post Number: 62 Registered: 03-2003 |
Well I am on the certified Warranty now... I dont know if that changes matters.... I have figured out the steering prob to be the steering box.... but im stumped on this chattering.... especially since i cant really start taking things apart in my apartment complex | ||
| James Newman (Lr_disco_i) Member Username: Lr_disco_i Post Number: 63 Registered: 03-2003 |
It may be what Reid suggests... hence my other posting about oil....lol | ||
| Brad Noviski (Bradnoviski) Member Username: Bradnoviski Post Number: 41 Registered: 02-2003 |
May be,mine has it too. I guess it is more of that great British engineering I keep hearing about.LOL Keep on the dearler ass to fix this stuff before the warranty is up. They may try to pull some shit on you. Like telling you you will need a valve job, rocker shaft or some other thing right after your warranty expires. Th oil thing deas not make sense to me, but what do I know. I just sit around and read the DISCOWEB all day long.LOL | ||
| Daniel Wanstrath (Danwanstrath) New Member Username: Danwanstrath Post Number: 4 Registered: 02-2003 |
That's most likely a lifter chatter. You can try putting in a heavier weight oil, that will quiet the engine somewhat. | ||
| James Newman (Lr_disco_i) Member Username: Lr_disco_i Post Number: 65 Registered: 03-2003 |
so if is lifter chatter there is nothing wrong? | ||
| Jonathan Hensel (Nanoscale) Member Username: Nanoscale Post Number: 59 Registered: 03-2003 |
DUDE! I know I am harping on the exhaust leak, just go try and tighten all your header bolts. Out of the 8 bolts on my left bank, 6 were loose, one was 5 turns out, the safety tabs don't stop them from backing out one bit, and the manifold is RIGHT UNDER the valve cover making the chatter sound like it's coming from there. Valves just don't start making a wicked racket one day unless something catastrophic happened. If they were loose, but tightening them doesn't help, then it might still be the culprit you just burned through the $9 gasket, or have a crack somewhere. They look like this, tap the safety tabs away with a screwdriver, grab a socket wrench and waste 10 minutes of your time..   | ||
| James Newman (Lr_disco_i) Member Username: Lr_disco_i Post Number: 66 Registered: 03-2003 |
I'll take a look this weekend | ||
| Richard Dekkard (Richard_dekkard) Member Username: Richard_dekkard Post Number: 45 Registered: 04-2003 |
safety tabs? | ||
| James Newman (Lr_disco_i) Member Username: Lr_disco_i Post Number: 68 Registered: 03-2003 |
damn and I thought I might need a new engine....lol My wife wont let me upgrade it until it dies...lol | ||
| Jonathan Hensel (Nanoscale) Member Username: Nanoscale Post Number: 61 Registered: 03-2003 |
Yup, the safety tabs are piece of sheet metal under the screw heads that have a tab you bend around flush with one of the flats on the hex on the screw head to supposedly stop them from backing themselves out. Very malleable they just bend out of the way. James lemme know if that's it... | ||
| Anthony Wright (Antzhill) New Member Username: Antzhill Post Number: 6 Registered: 04-2003 |
James, When does the “chattering” begin! - At start up - Or after the engine has idle (warm up), or you have driving awhile! I have the same left side “top-taping”, but it began not at first start up, only after the engine has warmed up. It will come and go sometime days in between! Must be rockers! | ||
| Jorge Verdeflor (Jrolfedrev) New Member Username: Jrolfedrev Post Number: 5 Registered: 02-2003 |
I also have a chaterring sound when the engine warm up. I already replace the lifters, rod bearings, and exhaust manifold and still have this annoying noise. I have a 145,000 mileage 94 Disco with the loose muffler heat shield too. Cost about $800.00 to diagnose the sound and replace the lifters, rod bearing and exhaust manifold from these shop (www.therovergroup.com). Valve,cylinder, cams are still good. I suspect it's the wrist pin or broken piston. Passed the CA smog check though, But the shop recommended to replace the the bottom part engine for a used one for $2,400.00. Any thoughts! | ||
| James Newman (Lr_disco_i) Member Username: Lr_disco_i Post Number: 73 Registered: 03-2003 |
Well mine is there from start up.... you just cant hear it as well because the engine is running faster and the noisy fan is more noisy...lol | ||
| Tony Zuniga (Tony23007) New Member Username: Tony23007 Post Number: 27 Registered: 05-2003 |
What does a valve job include??? I have the same noise, but in only happenes under load, meaning the car starts chattering once it nice and warmed up, the noise progresses as I drive it further. Also what type of heavy oil are you guys talking about Synthetic or more like a 10W40?? | ||
| Roland Kutasi (Disco1) Member Username: Disco1 Post Number: 146 Registered: 10-2002 |
Reid: If you have been experiencing a "chattering", perhaps knocking noise, it could be that you have piston slap. This can occur when the cylinders are slightly overbored at the factory. Usually these motors are sold off cheaply on the aftermarket scene and the purchaser usually tries to fix the problem by fitting forged pistons. Maybe, the factory decided that the problem was not great enough to worry about. Just a thought. BTW, there seems to be a lot of members posting "valve" problems. Is this a case of paranoia; because there's an engine noise, therefore it must be valves? | ||
| Jonathan Hensel (Nanoscale) Member Username: Nanoscale Post Number: 63 Registered: 03-2003 |
Roland that's kinda where I was going with it. A systematic approach to a noise starting with the easiest thing first, working towards the doom 'n gloom stuff later. I don't think he is doing anything though. | ||
| Bill Howell (Billh13) Member Username: Billh13 Post Number: 49 Registered: 03-2003 |
Tony, I see you have a '95. Your chatter under load is most likely the timing. I can't remember if it is too advanced or retarded if it is chattering. Somebody help me out here. I have a '96 so no dist. to worry about. | ||
| Tony Zuniga (Tony23007) New Member Username: Tony23007 Post Number: 34 Registered: 05-2003 |
Bill, would bad timing only happen when the car is hot and under load, because when I start my car in the morning I am good for 10 - 20 miles before I start hearing it. It's the weirdest thing and teh dealer can't figure out the problem. I suppose I should go and have my timing checked its an inexpensive test that might prove to be the problem. | ||
| Jorge Verdeflor (Jrolfedrev) New Member Username: Jrolfedrev Post Number: 6 Registered: 02-2003 |
Roland, For a piston slap issue as I told the rover mechanic, he suggested to just replace the bottom engine since tearing it will amount to the same cost. Do you think it's economical or how long can the piston slap last before the whole thing break down on a 145,000 mileage 94 Disco? Thanks. | ||
| todd powell (In4ma) New Member Username: In4ma Post Number: 16 Registered: 05-2003 |
i think you may be being paranoid. every disco i have ever driven has made the same noise. i figure if you turn the radio up you wont hear it. haha lol. seriously. from what i have heard around ALL discos do it. its just a thing they do.. | ||
| Tony Zuniga (Tony23007) New Member Username: Tony23007 Post Number: 39 Registered: 05-2003 |
Bill, Thanks for your post, I took my car to the shop and had them check my timing, apparently the timing was advanced by several degrees. The mechanic tuned it back in and my problem is solved. Thanks again, this cost me only $40 bucks, the dealer wanted another $70 bucks just to look at it. |
