Bolt to intake manifold loose

Hi Folks,

Recently refitted a coolant sensor and when refitting the intake manifold one of the bolt just peddles the thread into the engine block. When I took apart again noticed the engine block threaded hole to receive the bolts is actually a threaded bolt that appears to be glued or pressure fitted to the engine block. I dare not bang it back in for fear of cracking the block.

Anyone know how those received nuts are meant to be fixed to the engine block if they become loose?

Thanks,
A

your unlikely to crack the block ,it does sound like hole will need a helicoil

Thanks James. The threads are fine, but with the intake manifold, the 8 x 10mm bolts screw into threads within bolts that are separate to the engine block. One of these receiver bolts became loose when I tightened the manifold back on, it's a slight bigger diameter than the hole in the engine block that receives it. A strong blow of a hammer with some loctite seal should do it! ?

not sure what you mean but it doesnt sound right ,explain exact issue

The engine block has 8 holes in it for fixing the intake manifold onto it near the ignition wiring loom with 10mm bolts. The bottom part of the manifold (near the egr valve etc) has threaded bolts fixed to the engine block onto which the manifold is simply bolted with 11mm bolts

The holes don't have threads. Instead they have round nuts which have threads in them. These round nuts have a rough surface on the outside to grip to the holes in the engine block when receiving the bolts that holds the manifold.

The issue is that one of these round nuts has come loose, and no longer secures that bolt.

I'll take a photo when opening it tomorrow to clarify

it might help as manifold is secured to cylinder head

i think maybe the op is referring to something similar to the following, which uses an interference fit into a hole ?

Spot on bull, any idea how this interference piece would normally be securely reinserted into the hole ?

Hmmm.....not the faintest. I'd probably go and buy a new one from LR as it will be full size and have any knurling etc in new condition.

I wouldn't have thought they were heat shrunk into hole, but possibly. (If you think so, put it into a deep freezer !)

If it is the fixings for the bolts then those nuts are captive in the cam cover which is plastic.

I would gently tap back in and try again. They're not available separately.

For the nuts then there are studs which go into the head which are available separately (LR010408)

Thanks,

Is it called an interference bolt?

Any recommendations to parts suppliers that would stock would be much appreciated.

Anthony

Hi td4,

It's the nut as pictured by bullterrier, which sits in the engine head. Checked out the part number and Brit Car offer a replacement:

LR010408 | STUD M7 X 55MM CYLINDER HEAD 3.0L DIESEL - L322 RANGE ROVER | Land Rover | | Britcar (UK) Ltd

Is this right?

Cheers
A