Rover K-series inlet manifold - what size sockets/spanners to remove it ???

Question

Hi, I have a Rover 416 with the 16V k-series engine. I need to remove the inlet manifold to change the gasket but as having problems with the lower row of nuts. The upper row of stud nuts bolts have come off easily but the lower row fixings are much more difficult. They look like 10mm hexagons , but the first one I tried to undo would not turn with either a 10mm socket nor a 10mm ring spanner and it feels like either the nut head is being "rounded-off" or the tool is sliding off. Does anyone here have any experience with this job and know precisely what tool to use on these awkward nuts ??

Thanks ins advance

Steve

steveharvey [at] dsl [dot] pipex [dot] com

Chris Street · Accepted Answer

8mm. You also have a fuel line screwed onto the underside of the manifoldas well with some awkward screws to get out

mrcheerful · Answer

Most factory fitted bolts have a slight taper to aid the auto nut runners. The proper tool to use to undo them is a 6 sided socket or spanner of the appropriate size, you will be amazed at the difference it makes especially on the smaller sizes.

mrcheerful

Mike G · Answer

A 10mm AF spanner fits a 6mm nut. You sure you're giving the right spanner size?

8mm is the most common thread size for car manifolds. Spanner size for a std 8mm nut is 13mm AF. Whatever the size, it's preferable to use a hexagon or better still, a flank drive socket, to reduce the chances of rounding off the nuts. Mike.

Rover K-series inlet manifold - what size sockets/spanners to remove it ???

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