Reply With QuoteIt might have worn through the caps on the tops of the valves. Pop the rocker cover off and look at the valves / rockers / check the clearances.
Master
SupporterHi Guys, My wifes 1997 300TDI Disco has just developed an awful engine clatter. Can a 300TDI sound any louder, I hear you ask. It can disappear then re-occur. So Ive removed the heater plugs and valve cover to see whats going on when the engine is turned over with a socket on the crankshaft pulley. Result is No.1 exhaust valve springs shut with a click at one point and exactly one crank rotation later No.3 inlet valve springs shut with the same click noise. Timing belt is slightly overdue for replacement.
Would you suspect sticking valves (? bent stems) or worn timing belt and or gears. Your learned opinions please?
ForumSage
It might have worn through the caps on the tops of the valves. Pop the rocker cover off and look at the valves / rockers / check the clearances.
Master
SupporterThanks BigJon, I'll get the feeler gauge out. The valve (rocker) cover is already off. I'll need my reading glasses, but!
It's about to get a whole lot noisier if you don't get this sorted out, then it'll stop all together and be nice and quiet for a long time!. I would be suggesting put away the feeler gauges and reach for a socket set. when you say slightly over, what K's do you mean over?Originally Posted by LR1953
really cool tutorial for a disco timing belt replacement...
300TDI timing belt replacement - Land Rover Technical Archive - LR4x4 - The Land Rover Forum
ChatterBox
I'm no mechanic, but I would be fixing the noise by looking at the simple things first, like rocker clearances and caps. Timing belt maybe due and it's very wise to do it ASAP, but it doesn't sound like your problem and diving in to change the timing belt while you already have another problem is asking for confusing results. Fix one thing at a time!!
Let us know how you go in the rocker cover!
Master
SupporterAndrew, odometer is 336 thousand Ks, last changed at 232 thousand. I wont be running the engine until its fixed. I have 2 Defenders with 300TDIs and never had an internal problem - plenty of alternators and water pumps of course but who hasnt? always keep a spare of eack on the shelf
YarnMaster
SupporterLift off the rocker gear and have a close look at all the bits that go up and down
You have all but diagnosed the problem
You need to assess whether the free play that is allowing the valves to snap shut is in the roller/follower/pushrod combination or the rocker arm valve and spring
Perhaps a check of the pushrod lash cap to rocker arm (valve) clearances before pulling the rocker arm would be in order????
S
'95 130 dual cab fender (gone to a better universe)
'10 130 dual cab fender (getting to know it's neurons)
that's 104K which is around the official LR 'best case scenario" figure, but I've read a fair few opinions to change them at 70K to be safe regardless.
Stop/start driving is not best case scenario, the lower figure they give is 60K for adverse conditions, which if you think about it is closer to Oz conditions (dust, heat etc)
It says 200tdi in the link, but it has the 300tdi data as well.
http://www.landroverweb.com/Pdf-file...i_interval.pdf
Wizard
Hi LR1953,
If you give the engine a turn, by hand and just rock the rockers this will tell you if you have anything terminal in the rocker assy. A couple of push rod ends might have "gone soft" and worn, is the clatter at engine speed or half engine speed this will tell you where to look first, the valve train goes half the speed of the engine. At engine speed could be something amiss a bit further down.
As mentioned before could be an issue with the caps that sit on top of the valves, I had a consistent clatter at one point and found one cracked. If the noise disappears, could be a partially blocked oil feed to the head, rocker clearances don't usually fix themselves.
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