Viva GT: earth calling
Today I have added a new earth to the car, so as well as the nice big earth post at the rear of the car, I now have a 110amp earth lead direct from the battery to the front chassis leg on the drivers side.
From the battery following the same route as the live feed the lead snakes through the car to the engine bay. Note this has meant removing carpets, seatbelts, rear seats, rear quarter cards and endless screws / trims, which is going to take hours to replace. Good job I am not on a deadline anymore.
Here you can see it exiting the firewall and heading down to the chassis leg and utilising a welded in 6mm threaded boss. This boss also has the engine earth lead and one P clip for the fuel lines, so everything is nice and earthed.
Here is the engine earth strap, straight onto one of the engine mount bolts directly into the block.
Second job of the day has been to torque up the bottom pulley and adjust the crank trigger sensor. yesterday I was at the point where several mm of adjustment was required to move the sensor towards the block in order for the centre line of the sensor to be above the teeth and not the pulley flange. After that it was then a matter of height adjustment of the sensor to get the right air gap.
First off one of the spacers between the block and the sensor mount had to be removed and made thinner, this took a combined effort of a file, a Dremmel and some emery / sand paper. After an hour or so with various trial fits (means getting under the car each time) I had the right thickness. Once it was all placed back on the car I had the snesor mor ein line with the centre of the teeth.
Once this was in place it was time to review the air gap. I have changed out the bolt to hold the sensor in place for a cap-head screw, so I can now un-tighten and remove the sensor without having to take the mount off. With the sensor mounted directly to the mount the air gap is too close, so a washer was placed between the sensor bolt and the mount to lift it away, at this point it was 0.75mm away. Thats should do it fine.
In this last image one can see the spacer between the block and mount I had to work thinner, and the washer between the sensor bolt and mount, all small adjustment but hopefully they will get me the right signal. Before you ask, the fan belt is not out of alignment, it’s the angle the picture was taken at. It’s good at also explaining why a straight on sensor would of been in the middle of the fan belt, hense the angle.
Have I got a signal? not tried yet, lots of reassembly still to do, before I can turn it over on the starter and see if the crank oscilloscope records a signal. I also require another person to assist, so I shall be scalping for someone next weekend.
Thats means between now and next week, I need to get on with other jobs, the big one is to drain down the brakes and clutch hydraulics, break down the brake pipes and reove the pedal box, to sort out the pedal shaft bushes which are rubbish.