1998 Toyota 4Y propane/gas engine. We bought the forklift last year at an auction. It has aluminium tubes surrounding the four spark plugs. What is really surprising is that each tube is wedged between a spark plug and its seat in the cylinder head. The tube thus becomes part of the seal between the spark plug and its seat.
Do the tubes have to be replaced every time the spark plug is replaced? Does the crush washer on the spark plug stay or does it have to be removed? The washer is on right now.
Lastly, are BPR5ES the right plugs for it? If not what are the right ones?
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