Seat rails - drilling fibreglass necessary?
Discussion
Hi everyone..
So I’ve bought the recommended replacement seat rails from motaclan. Fitted them to my seats. Gone to fit them to the car but the bolt hole spacing is wrong.
30cm eye to eye along the rail front to back bolt spacing… on the car it’s 33cm!
Has anyone else had this problem or have I got the wrong rails?
Motaclan have been decent and offered to refund which is great but it’s leave me with just the rusty ones I took off!
So I’ve bought the recommended replacement seat rails from motaclan. Fitted them to my seats. Gone to fit them to the car but the bolt hole spacing is wrong.
30cm eye to eye along the rail front to back bolt spacing… on the car it’s 33cm!
Has anyone else had this problem or have I got the wrong rails?
Motaclan have been decent and offered to refund which is great but it’s leave me with just the rusty ones I took off!
No idea with mine, will the old ones clean up?
One of the tricks I found when putting the seats back in was to fit longer bolts, as you have to pull them down against carpet and sound deadening, then take them out one by one and replace with the correct length. I bought several sizes of stainless bolts so I could get the right length without having too much sticking through the floor to assist ground clearance.
One of the tricks I found when putting the seats back in was to fit longer bolts, as you have to pull them down against carpet and sound deadening, then take them out one by one and replace with the correct length. I bought several sizes of stainless bolts so I could get the right length without having too much sticking through the floor to assist ground clearance.
the old ones might clean up to be honest yes - once i'd removed them to put on the new ones they actually seemed to function alright - I kept them as it felt like a shame to throw them away.
There's not much to photograph its just four holes in a fibreglass floor. Are there any plates that sit on the floor to help strengthen it on the passenger side? looks a bit flimsy! Drivers side goes through a chassis bar on the front mounts.
There's not much to photograph its just four holes in a fibreglass floor. Are there any plates that sit on the floor to help strengthen it on the passenger side? looks a bit flimsy! Drivers side goes through a chassis bar on the front mounts.
Krog 4.5 said:
the old ones might clean up to be honest yes - once i'd removed them to put on the new ones they actually seemed to function alright - I kept them as it felt like a shame to throw them away.
There's not much to photograph its just four holes in a fibreglass floor. Are there any plates that sit on the floor to help strengthen it on the passenger side? looks a bit flimsy! Drivers side goes through a chassis bar on the front mounts.
Plates is a strong word for them, but mine has some large metal circular washers both above & below the fibreglass. No idea if that is from the factory or something a previous owner has fitted ...There's not much to photograph its just four holes in a fibreglass floor. Are there any plates that sit on the floor to help strengthen it on the passenger side? looks a bit flimsy! Drivers side goes through a chassis bar on the front mounts.
It was only of the runners as you have them, as I have 20-30 sets of new seat runners, some imperial and some metric, some TVR modified. I do not think they are era correct for the Cerbera. One thing I did like on the Tamora seat runner bolts were that the heads had hex lugs welded to the edge of the bolt hex to stop them from spinning, which is something I have taken to copying for all my TVR's. (as and when the seats are out).
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Edited by Adrian@ on Friday 18th September 11:50
Do the seats bolt to the tub in a Cerb?
What I have done in my cars (Ss and Wedges) as all the tubs were cracked around seat fixings:
1. Added an additional two layers of GRP over the floor. Made a vast improvement and removed the flex in the floor which is present from factory. Turned up the sides of the tub too. I did the footwells too but you could just do the seat section.
2. Used stainless steel set screws - fully threaded bolts - and bolted them to the runners using a regular nut on the rear and joiner nuts (for connecting threaded bar) on the fronts. Splodge of thread lock. Switched to M8 size which the parts are commonly available in stainless. Then used Form A thick washers and a 50mm repair washer on both sides of the tub. Nyloc nut to fix. By bolting the bolts to the runners then doing and undoing the bolts under the car is a one man process. They also lift the runner off the carpet to allow it to run smoothly.
3. Added braces to the chassis during the restos to bolt the seats directly to rather than the tub.
I'd redrill the tub to suit the new rails. Making up a template in ply or similar makes the job a lot easier.
What I have done in my cars (Ss and Wedges) as all the tubs were cracked around seat fixings:
1. Added an additional two layers of GRP over the floor. Made a vast improvement and removed the flex in the floor which is present from factory. Turned up the sides of the tub too. I did the footwells too but you could just do the seat section.
2. Used stainless steel set screws - fully threaded bolts - and bolted them to the runners using a regular nut on the rear and joiner nuts (for connecting threaded bar) on the fronts. Splodge of thread lock. Switched to M8 size which the parts are commonly available in stainless. Then used Form A thick washers and a 50mm repair washer on both sides of the tub. Nyloc nut to fix. By bolting the bolts to the runners then doing and undoing the bolts under the car is a one man process. They also lift the runner off the carpet to allow it to run smoothly.
3. Added braces to the chassis during the restos to bolt the seats directly to rather than the tub.
I'd redrill the tub to suit the new rails. Making up a template in ply or similar makes the job a lot easier.
Best of both worlds then 
Sounds like typical TVR. Probably used it as an excuse to just use one layer of GRP for the tub
Feels like I need a Cerb in my life.
My Tam did not have wedges welded to the seat bolts. Nice alternative. I would still raise the runners above the carpet though.
Sounds like typical TVR. Probably used it as an excuse to just use one layer of GRP for the tub Feels like I need a Cerb in my life.
My Tam did not have wedges welded to the seat bolts. Nice alternative. I would still raise the runners above the carpet though.
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