JAKE ADJUSTMENT ON ISX

[DosGatos]

When I replaced the rocker shafts, I had the same situation and all parts were oem. I was confused trying to follow the insite instructions but it finally clicked. In the end the process is adjust the intake/exhaust first, then loosen the shaft clamps and rotate the shaft (with the detents). It will seem odd to rotate the shaft and loose the fitup of the flat ends but the amount of rotation is fairly small. The combined clamping force of all the clamps will keep the shaft from rotation in service. The amount of rotation depends on the tightest jake rocker. Tighten the shaft clamps, adjust the jake rockers then re-check the intake and exhaust. It will work.