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Old 10-14-2011, 03:41 PM
v8volvo v8volvo is offline
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Join Date: Jun 2009
Location: Montana, USA
Vehicle: '86 745, '83 764
Posts: 1,625
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What a bummer. Looks like there's not much there that can be saved.

Yep, I had something like this happen to one of mine while I was driving it. I was able to stall it -- barely! -- by dumping the clutch in high gear. Even then, it slipped the clutch for a good few seconds before it finally killed. These motors can certainly produce a huge amount of power when they are getting major fuel and boost... I was glad it didn't break the transmission.

In the case of my incident, turning off the key did nothing. Evidently when the pump is turning at high RPM, fuel is able to be pushed past the plunger of the shutoff solenoid. Not a happy situation. My motor seems to have survived and still runs OK with a new pump on it, but I wonder whether the rotating assembly may have been damaged by high stresses from the over-rev and could fail later on... Haven't yet decided whether or not to tear it down preemptively.

On a different car in a separate incident, I also had a pump that had sat for years do something similar, though not nearly as extreme. It would start and immediately speed up to 2500 rpm, and would not move from that speed no matter where the throttle lever was set. Then eventually it would stall. Needed a full rebuild.

Glad you have an extra replacement motor to get your project back on track. It would have been a tough pill if that had been your only unit.

Anders, you have quite the collection of interesting cars. Will be interested to see your 244 TD when it is finished. Maybe those of us in the Puget Sound area will have to have a get-together sometime. There are several of us out here.
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86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
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