Breaking in a rebuilt engine.

I'm due to get my engine back in the next week and I was wondering what's the best way to bed in my engine, 2.5NAD. I will be asking the engineer what his recommendation is but is there any set way for land rover engines?

The only hard part for me is that the vehicle has no MOT yet so can't really drive it around to bed it in, is it safe to take it for an MOT during the bed in process due to emissions and the emission test?

Thanks
Chris

RodneyA said:

is it safe to take it for an MOT during the bed in process due to emissions and the emission test?

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You don't have any choice over that bit, so stop worrying about it.

Running-in usually involves a mixture of engine speeds and loads, starting at the low end for both and progressing over the next 1000 miles. Modern engines "don't need running in Sir" (engines never needed running in, but all engines, old and new, benefit to some degree).

Make sure you have decent oil, tell the tester it's a not-yet-run-in rebuild (they do have some mechanical sympathy), and change the oil at 1000 miles.

I doubt your average squaddie followed the running-in procedure on a new diesel and they still seem to last reasonably well.

to run in the engine ,dont let it idle or rev freely with no load ,give it plenty of hard work, it does make a difference with your engine bore ring contact

Is it MOT passable after a rebuild or will the emission be all shot for a while?

depends on rebuild but should be give it a good run first

Sadly I've no MOT at the moment to drive it, it is safe just caring the idle speed for a little bit just to bed it in a tad pre mot

RodneyA said:

Sadly I've no MOT at the moment to drive it, it is safe just caring the idle speed for a little bit just to bed it in a tad pre mot

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idling is the worst you could do it will glaze the bores not run it in ,give it a hard run to mot station

jamesmartin said:

to run in the engine ,dont let it idle or rev freely with no load ,give it plenty of hard work, it does make a difference with your engine bore ring contact

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This.

When i rebuilt both my golf and beetle engines i did exactly this, got the bores bedded in good. I just razzed it from the off lol. Both ended up as super revvy quick engines.

I used to do an 'italian tune up' on the golf before track daying it. Not sure if it made a difference, but the throttle did seem more perky after.

Will do, I'll take the long route to the MOT station