Mechanical Transmission Linkage on Atomic 4

Mechanical Transmission Linkage on Atomic 4

2 messages2015-08-23 12:13 UTCthrough 2015-08-23 15:31 UTC

Mechanical Transmission Linkage on Atomic 4

sa… [at] mascom.com2015-08-23 12:13 UTC
Does anyone have an Atomic 4 with the foot pedal control for transmission shifting? If so, I can use your help. I can't seem to find the position of components that will allow me to shift into Forward, Neutral and Reverse. I know the transmission will go into forward and neutral since I can contort myself into the quarter berth and move the lever by hand. The problem with the linkage is that I can't find a position to hook the shift lever on the shift shaft, connect the clevis end of the big curved push rod and create the motion that will move the lever. The normal position of the foot pedal was always with the control lever in the cockpit forward so that you lifted with your toe into forward, clicked down for neutral and then push down to hold in reverse. I have been chasing this problem as time allows in the slip since June and have not been able to move the boat all summer. I suspect that somehow (although I really can't say how this could happen) the shaft that the foot pedal and curved rod connects to has rotated so that it is trying to work backwards. Logic says that if the lever on that shaft was forward, clockwise rotation of the pedal shaft would cause the lever to push the curved rod back and reverse could engage. The same would be true for lifting up on the pedal to go into forward - it should pull the transmission shift lever forward. But, that shaft has the lever on the the aft side. If any of you have this type of control, could you look at your boat and tell me: 1. Is the lever on the pedal shaft forward or aft when at rest in neutral? 2. Is the curved rod curving up or curving down? Thanks in advance. Murph

Re: [Cal_Boats] Mechanical Transmission Linkage on Atomic 4

Tom Vandiver2015-08-23 15:31 UTC
Hi Cal Pals, We hope you are having a wonderful summer. We are still working on the cosmetics of Satori, our Cal 46 etc. I have been working on Atomic Fours since 1967 and after retiring, (the first time) in 1988,, when the lever is sailing about for 17 years, then swallowing the anchor on Bayou Chico FL, I re-started my boat engine business, Atomic 4's and Perkins 4.108's. Check my website BSHMarine.com Please be assured, I am not looking for business! We are booked up through the rest of this year, I am now 77 with some health issues, so am trying to play more. :-). A4 stuff:Check Moyer Marine's site for more pix & parts.The gear box/transmission on the A4 is a Paragon mechanical device driven from the aft end of the crankshaft. They will usually have a large lever on either the port or starboard side of the gear, depending on the boat manufacturer. Moving this lever toward the front of the boat, unless you have a V drive, will force the internals to slide over a through out bell, compressing the several forward clutch plates and the boat goes forward. Neutral is midway, when the lever is vertical. Pulling the lever aft engages the planetary gear, reversing the direction. It is a fairly simple, robust device that is adjustable for wear. Moyer has a good description on his site. Testing procedure:-Assure the boat is properly tied up to the dock.-Disconnect the clevis for the shift control and move it aside.-Have a trusted helper at the topside controls, start the engine, MAKE SURE YOU DO NOT HAVE LOOSE CLOTHING OR AN that is internally threaded.YTHING THAT CAN TANGLE.-By hand, alongside the engine, shift into forward and make sure it engages and the boat tries to go forward. Observe the position of the remote control. -Back to neutral, watch the prop shaft stop, then pull the lever aft to engage reverse. Observe the boat try to back. Turn the engine off. Have the person on deck operate the shift lever, hand or foot, and observe the range of motion of the cable connections.This is adjustable several ways.-The cable ends are threaded with a "keeper". This can be screwed one way or the other to adjust cable throw. If this was the problem, you fixed it.If it did not fix the problem, you may need internal adjustment. Check Moyers web site or contact me. Tom Vandiver, Cal 46 Satori, Pensacola, FL From: "sa… [at] mascom.com [Cal_Boats]" <Ca… [at] yahoogroups.com> To: Ca… [at] yahoogroups.com Sent: Sunday, August 23, 2015 7:13 AM Subject: [Cal_Boats] Mechanical Transmission Linkage on Atomic 4 Does anyone have an Atomic 4 with the foot pedal control for transmission shifting? If so, I can use your help. I can't seem to find the position of components that will allow me to shift into Forward, Neutral and Reverse. I know the transmission will go into forward and neutral since I can contort myself into the quarter berth and move the lever by hand. The problem with the linkage is that I can't find a position to hook the shift lever on the shift shaft, connect the clevis end of the big curved push rod and create the motion that will move the lever. The normal position of the foot pedal was always with the control lever in the cockpit forward so that you lifted with your toe into forward, clicked down for neutral and then push down to hold in reverse. I have been chasing this problem as time allows in the slip since June and have not been able to move the boat all summer. I suspect that somehow (although I really can't say how this could happen) the shaft that the foot pedal and curved rod connects to has rotated so that it is trying to work backwards. Logic says that if the lever on that shaft was forward, clockwise rotation of the pedal shaft would cause the lever to push the curved rod back and reverse could engage. The same would be true for lifting up on the pedal to go into forward - it should pull the transmission shift lever forward. But, that shaft has the lever on the the aft side. If any of you have this type of control, could you look at your boat and tell me: 1. Is the lever on the pedal shaft forward or aft when at rest in neutral?2. Is the curved rod curving up or curving down? Thanks in advance. 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