Checking torque on inlet manifold bolts

[RoverP6B]

My 4.6 was built 14 months, 12500 miles (20,000km) ago.

Can I check the torque on the inlet manifold retention bolts, or is that likely to compromise the integrity of the seal beteween the inlet manifold, metal gasket and cylinder heads?

Hylomar was used to seal around the areas where coolant either contacts, or enters the inlet manifold.

Thanks in advance,
Ron.

[sidecar]

Personally I think the torque figures that are usually quotes are too high.

I very carefully built my engine yet still stripped the threads in one of the holes whilst trying to obtain the torque figure (I think it was something like 35flbs)

Since then I have fitted bolts that are slightly longer, they are only a couple of mm off bottoming out. Jim of JRV8 also told me that the edelbrock manifold that I use should only be torqued to 25flbs max. (if I remember correctly). The Edel also needs different length bolts for a few of the holes, your manifold may be different.

Anyway I can't see a problem with checking them, just be careful about the figure that you decide to go for.

Pete

[RoverP6B]

Hello Pete,

Thanks for that.

The inlet manifold that I have on my 4.6 is the Rover manifold, as used on the series 2 P6B. The bolts are of different lengths, and the specified torque settings are 25 to 30 lbs ft.

On a further note, can I remove each bolt in turn, clean the threads, apply a coating of anti seize and refit??

If this is ok to do, I would remove and refit in the same order as the bolt tightening sequence.

Thanks again,
Ron.

[sidecar]

Hello Pete,

Thanks for that.

The inlet manifold that I have on my 4.6 is the Rover manifold, as used on the series 2 P6B. The bolts are of different lengths, and the specified torque settings are 25 to 30 lbs ft.

On a further note, can I remove each bolt in turn, clean the threads, apply a coating of anti seize and refit??

If this is ok to do, I would remove and refit in the same order as the bolt tightening sequence.

Thanks again,


Not sure why you would want to do that, I thought that you just wanted to check the torque. I guess that there is a risk if you undo each one then do it back up, it would more than likely be OK.

To be honest if they are not leaking and there is no other reason that you need to remove them I'd just leave them alone and go and find something else to do!

Pete
Ron.

[RoverP6B]

Hello Pete,

The inlet manifold bolts did indeed need tightening, so I torqued them all to 30lbs/ft , in the sequence advised.

I heeded your advise and did not remove them first.

Thanks very much,
Ron.