One mistake I caught in my post below. I said the friction screw is a phillips head screw inside the controller on the throttle side of the casting, however the factory friction screw was a 1/4x 20 hex bolt on the throttle side. The pan head screws are what keep the levers from sliding out of the controller.
Chuck G. From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Chuck Gilchrest via CnC-List Sent: Thursday, December 7, 2017 4:25 PM To: cnc-list@cnc-list.com Cc: Chuck Gilchrest <csgilchr...@comcast.net> Subject: Re: Stus-List Throttle Return Spring - Yanmar 2GMF The throttle tension screws only appeared after ’83 or so on the Edson model 816 and 870 dual lever controls. Up til then, many builders would install a clamp on the cable to prevent the spring from returning your throttle to idle without holding it down. Some boats, like my 83 Landfall 35 had the Edson 747 engine control that sat between the wheel and the pedestal with two additional steel tubes that contained the control cables. Since there was no way to induce friction on the cables using the controller, the only option was the friction clamp placed inline on the cable. My boat has a very long cable since the engine is mounted backwards in the boat and the cable needs to circle around the engine and all the way back to the throttle rack. One would think there would be sufficient friction in the cable, but there isn’t. Regarding the friction screw inside the pedestal, you’ll find a phillips head screw on the cast boss that holds the throttle lever control. This screw bears down on a white Delrin bushing that reduces friction between the aluminum casting and stainless lever assembly. Turning the screw clockwise SLOWLY will increase the friction on the bushing. If there is no friction when pushing the lever forward and releasing it, the lever will return on its own to the idle position. Turn the screw to apply just enough friction so that the lever stays in place when you push the lever forward, but not so tight that you have to force it to return to idle. It is a fine tune adjustment, but you’ll get the idea when it is right. Also, when the compass is off, make sure that the internal lever doesn’t move so far forward that the lever itself hits the pedestal guard. Chuck Gilchrest S/V Half Magic 1983 35 Landfall Padanaram, MA From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of robert via CnC-List Sent: Thursday, December 7, 2017 3:33 PM To: cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> Cc: robert <robertabb...@eastlink.ca <mailto:robertabb...@eastlink.ca> > Subject: Stus-List Throttle Return Spring - Yanmar 2GMF I also understand there is a 'throttle tension screw' under the compass of the Edson pedestal. Any advice/experience with this adjustment is appreciated. Rob On 2017-12-07 4:23 PM, robert via CnC-List wrote: My throttle cable has a clamp on it which crushes the outer cable to provide sufficient friction on the inner cable to overcome the force of the return spring in the diesel pump throttle lever. Has anyone any experience removing the 'clamp' on the cable and adjusting only the 'return spring' to properly tension the throttle cable so that it stays at a set RPM rather than slowing decreasing until it reaches it 'set point'. I somewhat like the idea of tensioning the 'return spring' instead of using an 'adjustable clamp' on the throttle cable. Rob Abbott AZURA C&C 32 - 84 Halifax, N.S. _______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
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