Rivnuts: Okay for Seat Mountings?

KeepDigging · Feb 9, 2014

Having snapped half the bolts holding the middle row down (300TDi), I was going to drill a new set of holes, pop in some rivnuts and bolt the seat clamps to those.

Is that going to be strong enough?

Thor1950 · Feb 9, 2014

no but hell no.......... They need a chassis anchor point. What are your passengers life worth? And it could void your insurance

Pikey · Feb 9, 2014

Thor1950 said:
no but hell no.......... They need a chassis anchor point. What are your passengers life worth? And it could void your insurance

Except that they probably aren't mounted to the chassis. Front seats in a fender just bolt to the Ally seatbox with virtually no reinforcement.

fanatic · Feb 9, 2014

It depends if seat belt mounted to seat.

KeepDigging · Feb 9, 2014

Seat belts are through wheelarch and boot floor using standard hardware. There's no way I'm risking that ...

Upper (backrest) mounts are also standard as I can see the backrest taking some force in the event of a collision. Seat base just seems to sit there with 4 10mm bolts.

SteNova · Feb 9, 2014

seats are fine on them, thats what defenders have as standard

belts need to be down to chassis

Thor1950 · Feb 9, 2014

SteNova said:
seats are fine on them, thats what defenders have as standard

belts need to be down to chassis

you saying the seats do not have a reinforcing plate under the floor, for the seat bolts?

SteNova · Feb 9, 2014

on mine the threaded sections look like rivnuts where you can see the rim flat flush on the top..... what they are rivited into.... no idea

deffo not nuts welded onto a plate

aaronmorris · Feb 9, 2014

They're definitely rivnuts in defenders.

Brian S · Feb 9, 2014

For just seat mounts on rear seat of disco then rivnuts should be fine. All anchor points for seatbelts are seperate.

KeepDigging · Feb 10, 2014

Rivnuts it is then. And I'll also fit some brackets on the front of the "seat box" to store jack handle, wheelbrace, fire extinguisher etc. so as they're out of the way when I'm running in "van mode"

Thor - I don't know whether to be grateful at your concern for my passengers or shocked that you'd think I'd attach seatbelts with rivnuts

but given the IQ of an average internet user, it was probably best to check

listerdiesel · Feb 10, 2014

Land Rover, in their infinite wisdom, fitted D2 seats with three nut inserts and one free bolt with a nyloc on the underside.

That's fine if you have nothing else under there, but those of us with sill tanks for LPG find that we have to take off the tanks etc to get at the bl**dy nut!

So, I have made up some 16g stainless discs with an M8 nut TIG welded to the plate, and the plate will be riveted under the floor pan.

Rivets will be fine, there is no pressure on them once the bolt is tightened up, and the disc spreads the loading over the floor immediately around the hole.

Peter

Thor1950 · Feb 10, 2014

KeepDigging said:
Rivnuts it is then. And I'll also fit some brackets on the front of the "seat box" to store jack handle, wheelbrace, fire extinguisher etc. so as they're out of the way when I'm running in "van mode"

Thor - I don't know whether to be grateful at your concern for my passengers or shocked that you'd think I'd attach seatbelts with rivnuts but given the IQ of an average internet user, it was probably best to check

Over seat belts here are attached to alot of the seat frames on our cars and suv's. Just thought it strange your seats would be different

aaronledwidge · Feb 10, 2014

Defender seats are a very different design as the load is supported through the seat box with minimal moment and should they shift your protected by the bulkhead backwards. I wouldn't personally use riv nuts to mount conventional seats. That's an awful lot of force

KeepDigging · Feb 10, 2014

Thor1950 said:
Over seat belts here are attached to alot of the seat frames on our cars and suv's. Just thought it strange your seats would be different

Different regs. We didn't get the slidey door-frame jobbies either. But we do have the belts cluttering up the rear floor while loading long cargo

ListerDiesel's idea looks sweet though. Might have a looksee as to whether I can get under there on the drive. If I can, there's a bunch of washers and nuts heading to my favourite welder - if you don't mind me borrowing your idea, that is

flat · Feb 10, 2014

Thor1950 said:
you saying the seats do not have a reinforcing plate under the floor, for the seat bolts?

on my fender it does, the rivnuts go through the seatbox on a double skinned section then through a steel plate about 1 inch square. seat rails then bolt to these rivnuts.

seatbelts are attached to god knows what apart from the roll bar.

Mine is a military 90 though so might be different to civi models.

So on US defenders are the seat belts attached to the seat?

even my bog standard vw golf has the seat and the seat belts attached to different points

listerdiesel · Feb 10, 2014

KeepDigging said:
ListerDiesel's idea looks sweet though. Might have a looksee as to whether I can get under there on the drive. If I can, there's a bunch of washers and nuts heading to my favourite welder - if you don't mind me borrowing your idea, that is

Feel free, helping out and making useful suggestions is what what the forum is about.

Peter

Rivnuts: Okay for Seat Mountings?

KeepDigging

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