AndyF07 said:

I have a 2002 4.0 P38 and have just replaced the exhaust system from the manifolds backwards. I am just about to torque everything up and checked RAVE. I am sure I am misreading something but there seems to be two torque values for the front pipe to manifold bolts. On page 11 of the repair section ( 30 Manifold and Exhaust System ) it says 50NM for 'from 99MY' but it the Torque Values ( 6 Torque Values ) it says 30NM.

Can anyone shed any light please as can't find an answer?

Thanks for any advice!

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AndyF07 said:

Thanks @Grrrrrr. There is a slight leak on both joins at 30NM although it's complicated slightly by the fact I wasn't sure which way round the gasket went (i.e ridged side into manifold pipe or front pipe. I will double check size of bolt before going tighter. I had to drill two of the old ones out which sheared so really don't want to do that again

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Grrrrrr said:

I don't think the ridge side really matters but I would have put the ridge the engine side of the join.

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kermit_rr said:

Neither is particularly tight, do it up by feel you should feel the gasket compress if the threads are clean

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AndyF07 said:

Thanks @kermit_rr. I will tighten then up further as it sounds like 50nm should be ok

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Grrrrrr said:

If you're ever putting a bolt in, particularly with ally, you can always sacrifice the old bolt and with a grinder cut a groove up its shaft and with a bit of moly grease just run it in and out the hole a few times before reassembly. Helps with getting the torque right. Obviously you'll have to clean that up if you're putting Loctite in it.

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