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Re: Wayne, Chadd, Somebody
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Posted by K.B.-826 on May 15, 2007 at 19:57:40 from (24.180.143.209):
In Reply to: Wayne, Chadd, Somebody posted by Allan In NE on May 15, 2007 at 10:41:08:
Allan, There were two different Robert Bosch rotary pumps used on the 310/358. The early ones were the "BR" model, they've got a two-piece housing, the injection line fittings come out of the pump at an angle, and they were used on 706, 756, and 826. Those pump have an excess fuel position for starting. Your pump is the "CR" model, used on the 686, 786, 886, 3088, and 3288. Those do not have excess fuel. The plunger you mention is nothing more than a stop. On a late pump like yours, when the top lever just touches the plunger, the engine should be at low idle. The lower arm on the late pump can also be used as a shut-off, by pulling it fully rearward. I'm guessing it was used for that in a different application, thus the hole for attaching a linkage. The screw at the front of the lower arm is your fuel delivery adjustment, further forward you move the arm, the more fuel you get. Now, back to the early pumps. They had another plunger to the rear of that lower arm. When the arm was pulled back far enough by the cable to just touch that plunger, it was in the excess fuel position. The engine was shut down by pulling the cable the rest of the way back, compressing the plunger into its barrel.
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