TR4-6 firewall, required for competition and a sensible addition to any road car. The fire wall is secured to the body shell between the cockpit and the petrol tank.

TR's 4-6 have the petrol tank fitted directly behind the cockpit rear trim board which is made from fibre board and cannot provide a safe barrier between the cockpit and the petrol tank. This kit when fitted provides a suitable metal barrier.

The kit consists of a main aluminium centre section and two small steel and two aluminium 'ears'. These 4 'ears' are supplied as follows: - Two made from steel so they can be welded into place, and two made from aluminium which can be riveted in place to the body shell. One or other pair will be used depending on your choice, driven by whether the body shell is painted or not.

Whilst we call this product a Fire Wall it is in fact a fluid barrier. Its intention is to reduce the possibility of petrol finding its way into the cockpit in the event of an accident. The aluminium sheet and steel or aluminium ears ears should be sealed and riveted/welded in place to ensure a fluid tight seal. Follow the fitting guide below.

FITTING 

The fit of the main panel is straightforward as there are 'L' brackets welded to 3 sides of the opening and the lip at the tonneau panel to the top, which the main panel of the firewall can we riveted to. Refer to the 3 photos.

First bend the bottom edges of the main panel over to make a 90 degree flange of 13-20mm. To determine how big the flange will need to be, offer into place the main panel and record how much of the sheet protrudes above the centre tonneau panel. Use this as a guide to determine how wide the flange will be, one each, left and right, and one over the rear floor hump. These flanges ensures the aluminium panel can be riveted in place and sealed properly. 

The main panel can now be riveted in place using sealant between the sheet and the body on final fitment. 

The two 'ears' fit under the side tonneau panels. See the photos. The aluminium ears can be riveted to the join between the main tonneau panel and the forward tonneau panel. There is a small 'L' shaped bracket on top of the wheel arch that the ear can be riveted to and there is a cut out in the top of the ear so that it can pass from inside to outside of the tonneau panel lip, to which it can be riveted. These aluminium panels are intended to be fixed to cars that are already painted. On cars that are as yet unpainted, the steel ears can be welded in place.

Please note.

1. for the purposes of demonstrating where the ears fit, the parts shown in the photographs have been simply rested in place to enable you to visualise where they go. Each ear will need to be cut to fit slightly as body shells will be slightly different. 

2. The aluminium ears are shaped to fit TR4A-6 Wheel arches which have a flat pressed into them to allow space for the hood frame, which is more complex, taking up more space than a TR4 hood frame. When cutting to fit TR4 wheel arches more material will need to be trimmed off to match the more rounded TR4 wheel arches.

Once in place the firewall should be thoroughly sealed all around so that fluid cannot pass.

Note that the wiring to the rear of the car has to pass through the firewall and this should be accounted for in preparing the main sheet or one 'ear'. Turn over the edge of the sheet where the wiring will pass so that a sharp edge is not presented to the wiring loom or use a suitable grommet. A grommet can be cut and superglue back together around the loom.