Vehicle & Technical > Discovery

3.9 v8 Discovery wont start....

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J.D.:
Sounds like a dropped valve or a loose tappet mate. Mine unscrewed a tappet adjuster not long ago and had those symptoms.

LANDYTIM:
Lucky its a Land Rover or it would be gone by now. What should my next step be?

J.D.:
Take the rocker covers off and check the tappets. Im not that familiar with V8s as I am with diesels but I assume it would be relatively similar.

Just check there isnt a loose / snapped tappet. If there is, tighten it up to the specified clearance and / or replace it and it should be fine. If not, its a head off job.

I beleive the air flow meter can sometimes cause this problem, but like I said, im not too hot on the LR petrol engines.

If you want a better explanation, feel free to bell me at the workshop - 0772 508 5775.

LANDYTIM:
GOING TO DROP ALL THE OIL AS WHAT IS IN THERE NEEDS CHANGING AND I9S TOO THICK ANY WAY. COULD THIS HAVE CAUSED THE VALVES TO STICK?? ALSO CANT GET THE DRAIN PLUG OUT THE SUMP, ANYONE KNOW WHAT SIZE IT IS? 28??

hairyasswelder:
Timing belts, adjusting tappets????? Only on Diesels  :-.

Try sneaking this into Range Rover section, more V8's in there  :?

 :-k the sump plug is either 24 or 27mm, cant remember which but 28mm is not a standard size,

If a tappet has failed then you need a new hydraulic lifter, yes the oil can make a difference.

How was it running before it failed to start?
Have you changed/altered anything?
Plug leads all back on correctly?

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