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Evening all

I’m replacing the main bearing shells on a 3.9 and the centre one has the notch about 2mm out of line with the bearing cap. They are genuine parts. Part is RTC1718.

Any ideas??

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Turns out (after speaking to LR), that my engine is a cross over between RRC and P38 and therefore has a few oddities, including bearing shells which are 10x the price from prior or subsequent model years. Yay.

They did say just file off the notch though, so I will!

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Does it have the cross bolts on the mains? That is the main difference between the RRC and P38 engines even though they are both 3.9 litre (3950cc for both the RRC 3.9 and 4.0 litre P38).

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How would I identify a cross bolt?

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A bolt that goes into the main bearing cap from the side of the block. If you look at a P38 engine you will see them just above the bottom of the block where it meets the sump. It is easily possible to use a P38 block with the front cover and distributor for an RRC engine, numerous people have built an engine with a 4.6 P38 block to use them in an RRC by doing this.

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Ah in that case, no it’s not cross bolted.

I nearly used a “spare” p38 4.6 engine instead of rebuilding this one but sold it instead !

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Cross bolted engines first appeared in the 4.2 version fitted to the long wheelbase Classic as a result of some research into producing a diesel version of the engine as it made the bottom end stronger. Other than that there is virtually no difference between the RRC and P38 blocks.