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Extreme Veteran
 
Location: Ignacio Colorado | If you are running the 440 and 727 transmission you should be very careful when changing to a different carb. The linkage going from the transmission to the carb is very important. It must be adjusted properly or the transmission will fail fast. It is designed to tell the transmission to increase the line pressure during heavy throttle/load. If it is set too loose the transmission will burn the direct/reverse clutches within a few hundred miles.
I know some of you are swapping carbs and happened to think to warn about this linkage adjustment. Very important!
Bill |
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Contributor
| Bill is this adjustment outlined somewhere in the service manual? I just added a cruse control and had to take it apart and put back together. I want to make sure I got right before heading to WI next week.
thanks, Jon #94 |
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Extreme Veteran
Location: Ignacio Colorado | Jon, I don't think it is in any of the manuals. I think a good place to start is to adjust the throttle linkage from gas pedal to the carb. Have to have a spare foot on the pedal and you be back at the engine. You want the pedal to bottom out just as the carb hits full open. If the carb is full open before the pedal hits bottom the cable and bell crank can be stressed at wide open throttle. When you get the cable adjusted you still want the spare foot on the pedal. At wide open throttle push the linkage going to the transmission towards the rear of engine/front of trans. You want to start by adjusting the linkage to be all the way towards transmission at wide open throttle. Drive the coach. Look at the shift points and also wide open throttle kickdown/passing gear. You may find the shift points to high, or requiring you to lift your foot off the gas pedal to get an up-shift, or if it downshifts at full throttle at too high of a speed the adjustment needs backed off to have more free play between the carb and transmission. If this adjustment has too much free play the kickdown to passing gear will not work properly and the direct/reverse clutches will burn up due to slippage when upshifting to third under a load. Hope this makes sense.Bill |
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Important reminder for carb swap