Sherman A4A2 diesel 2-3 shift problem

[Malcolm Towrie]

Today, we tested the slow responding engine with the governor completely disconnected from the rack control tube rod, so just hand operating the rack tube. Throttle response was great, very fast. So that seems to rule out oil burning or sticky injector.
Then we tested response of both engines with the linkage disconnected from both governors. So hand operation of the speed control lever on the governor of each engine. Again it was good for both engines. Raising rpm to 1500 and snapping the lever back to idle showed both engines idling down fast.

Connecting the linkages showed problems. Despite syncing both engines earlier, they're were now badly out of sync, with one revving to 1500 and one barely coming off idle. I found one clevis pin badly loose in the clevis, and the bushings supporting both ends of the throttle cross shaft that connects the two engines badly worn. So as Kirk said, that may be the culprit. We'll fix the looseness and go from there.

Thanks again.

Malcolm