Osburn OB02401 - Manual (Page 31)

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4.5 Secondary air tube replacement (see Figure 4.5)
1. Remove cotter pin at LH end of tube.
2. Slide tube to right and lower tube end below LH plenum.
3. Slide tube to left to remove.
4. Reassemble in reverse order using a new cotter pin. The cotter pin is a hammerlock style
and locks into place by hitting the head sharply with a hammer.
5. Note that any tube can be replaced without disturbing the baffle.
Important Notes:
The air tubes are identified for placement as follows:
Front to back: Tube No. 1 30 Holes of .188” diameter
Tube No. 2 32 Holes of .156” diameter
Tube No. 3 32 Holes of .156” diameter
Figure 4.5 – Secondary air tube replacement