Poulton Pilot

[poulton pilot]

Based on 'general advice' from other sources, I ran my 2.7 S Type diesel at high rev's to clear out carbon deposits (engine has recently been Terracleaned), and shortly after beginning the high rev's run, a loud knocking sound developed (similar to a very rogue tappet) in time with the engine rev's so I eliminated anything to do with the gearbox.

Anybody had experience of similar happening to their S Type and if so, what was the root of the problem?

Thanks.

[richdraper]

you say a rogue tappet, i hope it is, for your sake... please get a professional opinion, before taking anything posted on a public forum as a concrete diagnosis but it sounds to me like its 'knocked a bottom end out' by this i mean damaged the crank bearings... certainly not uncommon with the 2.7, for some reason the 2.7 suffers dreadfully with diesel getting into the oil due to regen procedure coupled with non regular oil checks and 'extended' servicing periods. this thins the oil sufficently that although the pressure is there the volume of oil is not. this leads to crank big ends/journals hitting each other which is most probably whats happened, in my experience...

You'd be looking at about £2-3k for replacement unless your in a position to do it yourself. this is because the range rover guys seem to like to over pay for everything,  unfortunately they had these 2.7s as an option  

sources:- father inlaw recently screwed his 2.7 s-type in almost exactly the same way. 

there are thought to be many reasons why this happens, in reality nobody is really 100% sure. there also appears to be widely differing views on how to stop it from happening. The 2.7, in my experience, certainly wasnt the strongest motor in JLRs lineup.

whatever the outcome I'm truely sorry for your loss, i hate engine deaths, and especially when they happen so regularly like on the 2.7 

[poulton pilot]

Thanks Rich. Got a 'phone call from the garage this morning but only to ask if it's OK to go ahead with diagnosing/investigating the problem but no hint as to what the problem actually is; keeping everything crossed in the hope that it is a tappet or something at the upper end of the engine. If it's something along the lines of what you think it may be, I'll just have to be philosophical about it and take the hit and make sure that all of the oils are changed to avoid similar happening again.

Thanks again.