We have just purchased a 1978 CAH Corsair and find that the starboard side fly bridge throttle need to be adjusted so it is in sync with the port and have no clue what is entailed to do this.

Is there anyone who can provide a detailed description on what is necessary to complete this task?

Carl forwarded your question to me. I also have a '78 with twins and, would you believe, I have replaced throttles, cables and tachs over the years; so have a bit of background with your situation.

From your correspondence with Carl, I understand the problem is with the position of the throttle handles, and that the tachs are reading the same when the engines are physically sync'd (You can tell by ear), but the throttles are in different positions. Conversely, when the throttles are even, the engines are 7-900 rpm different. I also conclude that the lower station throttles are pretty much in line.... only the flybridge ones are off.

[If the problem was with the tachs, there is an adjustment screw on the back of them. However, at 32 years, I guess the whole tach can go gunnysack -- I replaced one of mine three years ago, and have another one giving me random readings sometimes.]

Two possibilities for the physical misalignment of the throttles.

1): If for some reason, your boat still has the original throttle housings, it is quite likely that the pot-metal "spiderweb" support bracket has broken, and this allows the handle(s) to "float". This situation usually occurred with the shifters rather than the throttles, since we bang them around more than the throttles. That housing was a bad piece of engineering, and crapped out for many/most of us years ago. Once that spiderweb broke, the housing was not repairable, and most everybody put on Morse control handles. The "T" shaped handles in the attachment are originals (my lower station). The ball-shaped ones are newer Morse controls (my upper station).

Hint: If the throttle cables, or especially the shifters, are stiff, you might want to replace the cables. Many folks had the cable between the upper and lower stations break, leaving them in gear when they were maneuvering to land, usually in close quarters. Bad news! Invariably, the shifters got progressively more stiff before they broke, so if yours are hard to move, I'd strongly suggest new ones. New cables are reasonably cheap, and you'll learn a lot about how things are hooked up by the time you fish them into the correct spaces.

Hint 2: If you are new to twin engines, there is a "How to...." item in Carl's website, under Question 8, to help new owners get a running start on how to operate their "new" CAH.

Hope this helps. Let us know how things progress.

OldBoater Dean