hydrolic tappets

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The question is, why would it need all the hydraulic tappets replaced?

The only possible reason is that oil changes have been neglected and the NRVs have deposits on them keeping them open. One tappet may fail now and again, all twelve there is a reason for. Normal cure, that can work for the odd sticky tappet, is high RPM for a sustained period. Clean oil first though. And maybe a couple of cans of STP.
 
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i just got the range rover and its oil was black and like water but its all new with new fillter now.
its not bad when i 1st start it but when its up to temp it sounds like a heavy tapping in rocker cover.
sound like just one but i was thinking its best to change them all
it has no servive history
i will try the tins of STP ,,thanks for the help
 
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i just got the range rover and its oil was black and like water but its all new with new fillter now.
its not bad when i 1st start it but when its up to temp it sounds like a heavy tapping in rocker cover.
sound like just one but i was thinking its best to change them all
it has no servive history
i will try the tins of STP ,,thanks for the help


Can't see how a thick gloop like STP will help. Replacing the engine oil with cheap ATF and then driving (gently) for a few days is more likely to unstick gummed up hydraulic tappets. ATF has tonnes of detergent in it, the downside is any sludge knocking around in the engine will go for a trip round the block too. After a few of 20-30 mile trips if they tappets don't free up then it's time to replace them, if they do then drain the ATF (when hot) and replenish with engine oil. Obviously this is carried out at your own risk but it has worked for me a couple of times over the years.
 
hi i did the pint of diesel in the old oil and let it run for half hour .
let the old oil dran for a hour used millers oil and new filtter .
i think my most miles in a day is about 5 mile so i will just run it for 2 to 3 week with a drive down a bit of motoway about 10 mile and back.
if it still tapping then i will replace it.
then got on to all the other jobs .
thanks alot still lerning things 1st range rover i have had ;)
 
Can't see how a thick gloop like STP will help. Replacing the engine oil with cheap ATF and then driving (gently) for a few days is more likely to unstick gummed up hydraulic tappets. ATF has tonnes of detergent in it, the downside is any sludge knocking around in the engine will go for a trip round the block too. After a few of 20-30 mile trips if they tappets don't free up then it's time to replace them, if they do then drain the ATF (when hot) and replenish with engine oil. Obviously this is carried out at your own risk but it has worked for me a couple of times over the years.

You may not see it but i can that is why i said to do it. ;);)
 
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