Guy J
New member
Heat shields
On removing my injectors I discovered cylinder 1 injector was without a ‘top hat’ heat shield, just the lip in the hole and nothing beneath, neither was there a heat shield stuck on the top of the injector, as in photo 1.
Cylinders 2, 3 and 4 have the lip and then a washer, seated in the hole, as seen in photo 2. This is definitely a washer as we rotated one by 90 degrees. Cylinder 1 piston head had significant scoring, which could have been caused by the washer disintegrating and falling into the combustion chamber.
I bought one heat shield to try in cylinder 1, with all correct washers in place and the ‘top hat’ shield is too big to go down beneath the lip, so the injector is not inserted far enough, as shown in photo 3
The outer diameter of the ‘top hat’ heat shield is 17.4mm, and the diameter of the hole bored beneath the lip is 14.5, therefore there is no way the shield will fit in the hole. The diameter of the injector nozzle is 13.8mm. When the top hat shield is fitted over the injector nozzle, there is about 1.5 mm of play. The new injectors are exactly the same dimensions as the old ones, the engine is standard, as far as I’m aware, probably 1980s, and was running, seemingly very well, without heat shields but with these washers balanced in place for quite a few years.
What should I do?
Guy
On removing my injectors I discovered cylinder 1 injector was without a ‘top hat’ heat shield, just the lip in the hole and nothing beneath, neither was there a heat shield stuck on the top of the injector, as in photo 1.
Cylinders 2, 3 and 4 have the lip and then a washer, seated in the hole, as seen in photo 2. This is definitely a washer as we rotated one by 90 degrees. Cylinder 1 piston head had significant scoring, which could have been caused by the washer disintegrating and falling into the combustion chamber.
I bought one heat shield to try in cylinder 1, with all correct washers in place and the ‘top hat’ shield is too big to go down beneath the lip, so the injector is not inserted far enough, as shown in photo 3
The outer diameter of the ‘top hat’ heat shield is 17.4mm, and the diameter of the hole bored beneath the lip is 14.5, therefore there is no way the shield will fit in the hole. The diameter of the injector nozzle is 13.8mm. When the top hat shield is fitted over the injector nozzle, there is about 1.5 mm of play. The new injectors are exactly the same dimensions as the old ones, the engine is standard, as far as I’m aware, probably 1980s, and was running, seemingly very well, without heat shields but with these washers balanced in place for quite a few years.
What should I do?
Guy
