Re: Zel's Fleet Blog...Rover, Renault, Peugeot, Trabant, Invacar & Sinclair C5
Posted: Sat Jun 21, 2025 9:46 pm
I've a lot of time for the P4. They are just so well engineered cars, and the only real gripe in day to day use really is that the steering is both pretty heavy and low geared so can be a bit hard work around town.
This one hasn't been in regular use for a while. The last MOT looks to have been in 2010 and it's done all of a couple of hundred miles since then. We know it was dismantled to some extent for some bodywork and a respray and never really got put together again until recently.
There has been a fair chunk of work done to it on the brakes, fuel system, a new brake servo, negative earth conversion, and I believe an ignition system overhaul. However it's never really been given a proper shakedown and put back into regular use.
I've only driven around the block so far and can see that there definitely are some adjustments needed to both the brakes and steering, but nothing really too alarming.
First port of call will be the cooling system though. The hoses are...well...see for yourself.

Yeah, they're a bit crunchy. Helpfully a full set of new ones came with the car.

This was one of the first things I swapped out on my previous one, so retreading familiar ground.
The fuel line between the filter and carburettor also looks rather sorry for itself with the outer sheath having disintegrated.

A replacement for that has been ordered. The vacuum line to the float bowl vent will also be changed for some hose that I know is fully ethanol safe. That's actually not a huge worry on this car as many this age all the factory fuel lines are either metal or nylon.
A bit of a cooling system bodge had to be made on the evening before it was due to be collected when the seller poked a hole in a metal elbow between the bottom radiator hose and the water pump. Again I'd be planning to replace this as both of the metal cooling lines on my last one were paper thin. It was shoved back together using a bit of intercooler piping that the seller had to hand to allow it to be run safely for loading etc.

Replacement correct elbow has already been ordered.
Also on the way are a set of sill mats as those are all missing.
A new lens for the offside tail light which has clearly taken a knock at some point.

Replacement for the badly clouded grill badge. Yes it's a tiny detail in the grand scheme of things, but it's one that really draws your eye because it's so prominent. I don't have a good photo of that yet.
Replacement for the rear cabin grab handles as they have pretty much completely disintegrated.

I think there were a few other bits and pieces in the order as well that I've forgotten and just general service items like oil/air filters and such. Just things I spotted that I needed after a quick walk round that I didn't already have in the boxes. These new furflex seals for the doors are in those boxes waiting to be fitted. I'm sure that won't be at all fiddly.

The original radio is in those boxes and I'll be looking forward to revival of this beastie.


Though there is a definite case of "WHY?!?" already.

If you remove the single flat head screw from it that cable just unplugs from the back of the unit.

Not the end of the world by any means but does make you roll your eyes a bit. The car having been converted to negative earth likely will complicate things in the audio department, but I don't think it will be insurmountable. Just will need a bit of thought - vintage electronic restoration is one of my old hobbies though so that doesn't put me off at all. As far as the radio itself goes, few new capacitors and replacement of the broken cord for the tuning knob and it'll probably just work. Contrary to what a lot of people think valve era stuff like this really is surprisingly dependable. Nothing looks to have melted down horribly in this one at a glance so I'll bet it will go again.
Electrical hackery is definitely evident in a few areas of the car already, so that's something I'll just need to address as I find it. Immediately obvious is that the fuel gauge is inoperative (the sender unit has been replaced), as is the brake warning light on the dash. I'll need to investigate what type of gauge the fuel gauge actually is. I'm hoping it's a thermal one as that would mean it won't care at all about the polarity change - if it's a moving coil or moving iron gauge though I'll need to do some wiring tweaks to get it going again. The gauge itself is getting power though it seems as switching it to oil level mode does bring it to life - albeit immediately reading full scale when I know full well the oil level is actually a little low.
I'm not surprised that the brake light isn't working given that I know that one of the terminals on the reservoir should have two connections to it (I had to fault find on this on the last one too), and one of those is clearly missing on here. There's also a conspicuous bare wire just floating around in the neighborhood...hmm...

What would you say the odds on these being related are?
That's about where we are now. Looking forward to getting a chance to actually spend more than ten or so minutes looking at it.
Did fix the first fault though - nearside front indicator wasn't working. This turned out to just be because it wasn't plugged into the loom. That was a ten seconds fix!

If only they were all going to be that easy!
This one hasn't been in regular use for a while. The last MOT looks to have been in 2010 and it's done all of a couple of hundred miles since then. We know it was dismantled to some extent for some bodywork and a respray and never really got put together again until recently.
There has been a fair chunk of work done to it on the brakes, fuel system, a new brake servo, negative earth conversion, and I believe an ignition system overhaul. However it's never really been given a proper shakedown and put back into regular use.
I've only driven around the block so far and can see that there definitely are some adjustments needed to both the brakes and steering, but nothing really too alarming.
First port of call will be the cooling system though. The hoses are...well...see for yourself.

Yeah, they're a bit crunchy. Helpfully a full set of new ones came with the car.

This was one of the first things I swapped out on my previous one, so retreading familiar ground.
The fuel line between the filter and carburettor also looks rather sorry for itself with the outer sheath having disintegrated.

A replacement for that has been ordered. The vacuum line to the float bowl vent will also be changed for some hose that I know is fully ethanol safe. That's actually not a huge worry on this car as many this age all the factory fuel lines are either metal or nylon.
A bit of a cooling system bodge had to be made on the evening before it was due to be collected when the seller poked a hole in a metal elbow between the bottom radiator hose and the water pump. Again I'd be planning to replace this as both of the metal cooling lines on my last one were paper thin. It was shoved back together using a bit of intercooler piping that the seller had to hand to allow it to be run safely for loading etc.

Replacement correct elbow has already been ordered.
Also on the way are a set of sill mats as those are all missing.
A new lens for the offside tail light which has clearly taken a knock at some point.

Replacement for the badly clouded grill badge. Yes it's a tiny detail in the grand scheme of things, but it's one that really draws your eye because it's so prominent. I don't have a good photo of that yet.
Replacement for the rear cabin grab handles as they have pretty much completely disintegrated.

I think there were a few other bits and pieces in the order as well that I've forgotten and just general service items like oil/air filters and such. Just things I spotted that I needed after a quick walk round that I didn't already have in the boxes. These new furflex seals for the doors are in those boxes waiting to be fitted. I'm sure that won't be at all fiddly.

The original radio is in those boxes and I'll be looking forward to revival of this beastie.


Though there is a definite case of "WHY?!?" already.

If you remove the single flat head screw from it that cable just unplugs from the back of the unit.

Not the end of the world by any means but does make you roll your eyes a bit. The car having been converted to negative earth likely will complicate things in the audio department, but I don't think it will be insurmountable. Just will need a bit of thought - vintage electronic restoration is one of my old hobbies though so that doesn't put me off at all. As far as the radio itself goes, few new capacitors and replacement of the broken cord for the tuning knob and it'll probably just work. Contrary to what a lot of people think valve era stuff like this really is surprisingly dependable. Nothing looks to have melted down horribly in this one at a glance so I'll bet it will go again.
Electrical hackery is definitely evident in a few areas of the car already, so that's something I'll just need to address as I find it. Immediately obvious is that the fuel gauge is inoperative (the sender unit has been replaced), as is the brake warning light on the dash. I'll need to investigate what type of gauge the fuel gauge actually is. I'm hoping it's a thermal one as that would mean it won't care at all about the polarity change - if it's a moving coil or moving iron gauge though I'll need to do some wiring tweaks to get it going again. The gauge itself is getting power though it seems as switching it to oil level mode does bring it to life - albeit immediately reading full scale when I know full well the oil level is actually a little low.
I'm not surprised that the brake light isn't working given that I know that one of the terminals on the reservoir should have two connections to it (I had to fault find on this on the last one too), and one of those is clearly missing on here. There's also a conspicuous bare wire just floating around in the neighborhood...hmm...

What would you say the odds on these being related are?
That's about where we are now. Looking forward to getting a chance to actually spend more than ten or so minutes looking at it.
Did fix the first fault though - nearside front indicator wasn't working. This turned out to just be because it wasn't plugged into the loom. That was a ten seconds fix!

If only they were all going to be that easy!




























































































