Legendary blocking problem at LR Disco 4

volvol said:

Hello everyone

I am new on the LR side (before I ride an volvo XC90 and now an Ford Expedition)
But since my friend is buying an LR Dico 4 build in 2012 with SDV6 engine we also have some problems with that.

So I‘d like to discribe our problem and would be soooo happy, if someone could help with his experience:

Start…
Cylinderhead Cover bank 2 was broken so we dissassebleing and istalling 2 new once.
That was a good opportunity to also change the wasted hydros at the intake side
After assembling we learnes -> engine in not able to tourn over by hand (close to OT from booth sides)
We checked all cylinders and intake hole properly with a camera -> looking great
The blocking seems to be in the crankshaft, because we removed also the timing belt, set the camsafts to „free“
Engine is blocking furthermore matallicaly

Next…
We removed the front transmission gear and oil pan
No damage in the crankshaft, no visible blockings, no damage damage of shells
All looks fine… but engine is already blocking in the same position

Any Idea from the experts here?

Thx a lot and nice greets… Matthias

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lynall said:

So you replaced the rocker covers/intake manifolds, and whilst there decided to do the cambelts, and now the engine will not rotate?
Did you use any locking tools?

If you are trying to roate the crankshaft with the cambelt off then yes the engine/crankshaft will stop/lock as one of the pistons will hit one of the open valves.

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biketeacherdave said:

You may have a spun bearing.....look here for more info.
LRTIME on youtube

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volvol said:

Hi lynall

Yes, correct. Because half of the work is done if the intake manifolds are dissassembled. So it is easy
Change the hydros as well.

We trying to rotate the crankshaft with timebelt is on. So that „normally“ the engine has to run as normal.
But it doesnt work. Engine is blocking with timebelt/without timebelt/without camshaft intake side.
Always the same

Also we tested to move the cams when the the crankshaft ist blocked. Bouth cams are free, and able to rotate in cylinder 1+4 OT position.

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lynall said:

Have you checked the camshaft to crankshaft timing?

Is the hpfp causing an issue?

By hydros I assume you mean hydraulic tappets? is so has one of them jacked up and locked?

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volvol said:

Hey…

Yes I did…
The timing was not changed, belt not removed before, and there was no issue with the engine before starting the repair.

What does hpfp causing means?

And, yes I mean the tappets.
You are right, I also have the concern, that one of the new tappets makes this problem.

Therefore I remove the intake cams on back 1 and 2 to set the valves free.

But nothing was changed. Engine blocks as before…

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lynall said:

I was thinking the hpfp (high pressure fuel pump) which is belt driven off the right hand cylinder head (viewed from the front of the car) might be locking up, hence the reason the engine stops at the same point every time, this is belt driven.

Though this is really bit of a stab in the dark as the slightest thing will stop an engine being turned manually!

I have also read quite a bit recently of the camshaft drive pulleys breaking up causing mayhem.

I assume you have given the front crank damper/pulley a prod/lever with a bar to see if the crank is at fault as suggested by @biketeacherdave above? Though as I guess you are turning the engine over with a bar and socket you would notice if the pulley had excess movement.

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volvol said:

Hi lyn
Good idea. That is what I also would assume.
So wie deleted the timingbelt to Test it.
Timing belt goes through the cams to the hpfp… now its Not longer connected to the crank, but Engine already is blocking at the Same Position.

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