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

On Sat, 10 Sep 2005 16:50:57 +0100, Steve Harvey wrote:


> 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


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

"Steve Harvey"  wrote in message 
news:432300e4$0$22944$cc9e4d1f@news.dial.pipex.com...

> 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


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

"Steve Harvey"  wrote in message
news:432300e4$0$22944$cc9e4d1f@news.dial.pipex.com...

> 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.


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.