a good engine should start on first revolution of the starter in the morning after one cycle of preglow of 7 seconds (factory spec) - in summer. It should idle clacky till it warms up. After warm up (half gauge) the clack should go soft.
If you need 2 glow cycles in summer - your engine is duff, either the timing is badly messed up (including the injection nozzle break pressure and the injection pump advance control and also LDA boost signal fuel increase.) or the engine has low compression - maybe a bad hone job on the cylinders or incorrect break in procedure.
What most mechanics refuse to accept is that the headbolts and crank main bolt requires renewal on overhaul, Also the injection timing needs to be set with a dial gauge (its a 3 cyl - the firing pulses are too far apart, and needs dead accurate timing to fire off).
The original foam padding can be bought from industrial pipe places - its called barrier insulation foam - used in generator canopies, its black thin foam further padded with natural fibres at the back. The G100 engine room is completely covered in it, the bonnet also is covered with thick foam padding, so much so the under shields also had this padding, the plastic shields were the first items to be thrown away by mechanics on the first oil change - as it requires complete removal.
