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[Dingleberry]

How hard is the task of replacing the big end bearings on a 3.0 MV6 auto ?

[omega rick]

not an engine in situ operation if you want to do the job properly and you want it to last , you need all the correct tools to measure for crank wear, thrust washers ect , and you also need to determine why the shells have failed , not a job for the fainthearted 

[Kevin Wood]

Not sure the whole upper sump can be removed in-situ either.  :-/

I'm with Rick. Big ends don't just go in isolation on modern engines. To fix it properly you need to find out why the problem occurred and fix the root cause and any other damage that has occurred. That requires engine out and a complete stripdown IMHO.

If you can't do that, a 2nd hand known good engine is your best option.

Kevin

[mantahatch]

It cannot be done in situ in my opinion, when we bought mum's car with a siezed bottom end we started by stripping out the bottom of the engine. it was a mistake, we bought replacement engine and changed in a leisurly weekend and we left the auto box in place, I found this easier with an auto. it may be more difficult with a manual trying to line up the imput shaft.

HTH

Mike

P.S. on mums car someone had try to use silicon sealer on the oil cooler pipe connections and some had broken free and blocked an oil way.

[Dingleberry]

I recon they have gone due to my ignorance, the oil pressure light doesnt work, i bought a new sensor as the old one was broken but never got round to "fitting it" and guess i may have gone round a few tight bends with low oil ? 

Im not to fussed about taking the engine out as i wanted to convert it to manual anyway, just means im in more of a rush now to get the Range rover sorted so i can take the Mv6 off the road for a little bit 

[Kevin Wood]

It's possible that you've damaged the main bearings too, then. :-/

I'd say it's unlikely that a short oil surge would have taken out cam journals, etc so it might be worth a go at replaing the big ends.

If you've got a conversion planned anyway, however, I'd take the engine out and check mains and big ends, and get the crank checked and journals polished to be on the safe side.

Check the oil pickup is clear and perhaps give the oil pump a once-over just in case.

Kevin