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Won’t crank
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Member Since: 07 May 2024
Location: Cheshire
Posts: 1

United Kingdom 
Won’t crank

Hello. I have just rebuilt the engine in a 2010 Disco 4 with the 306DT engine after a con rod bearing failure. My son bought the car with the engine fault so we never heard it run before strip down.We took the body off to get the engine out and put it back on this week and connected everything up. When I press the starter button to turn on the ignition all The dash lights up correctly but when I press the brake pedal and push the start button again all the dash turns off and the starter motor does not engage. We primed the fuel system by feeding the electric pump in the fuel tank 12volts before we dropped the body on and cranked the engine with a direct feed to the starter to ensure we had oil pressure so it is not an issue with the engine itself. I am thinking bad earth connection? Any ideas please? Thanks.
Post #236991129th May 2024 5:24 am
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Member Since: 24 Sep 2023
Location: Highlands
Posts: 321

Scotland 2005 Discovery 3 TDV6 Base 7 Seat Auto Zambezi SilverDiscovery 3

No expert on any of this, but could it be the brake pedal switch? Sounds like it is earthing out when you press the brake?
2010 FL2 TD4e GS
‘93 Defender 110 200TDi CSW - still got this, non-runner on SORN.
‘87 Defender 90 4 cyl Petrol
‘83 110 CSW V8 - best ever!
Range Rover 2-door V8 (not sure of year - 4-speed box and vacuum diff switch)
Series III SWB Diesel 
Post #236991329th May 2024 6:10 am
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Member Since: 07 Mar 2009
Location: Clanfield, North of Pompey - UK
Posts: 2740

England 2016 Discovery 4 3.0 TDV6 HSE Lux Auto Loire BlueDiscovery 4

Might be worth checking you've reconnected/refitted the earth strap between the engine and chassis.

There have been plenty of cases of D4s not cranking when the strap has broken.

A quick and easy test is to put a jump lead between the engine and the battery -ve terminal.
 Heaven doesn't want me, and hell is afraid I'll take over.  
Post #236992729th May 2024 10:39 am
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