RS Disposal Posted Tuesday at 10:00 PM Share Posted Tuesday at 10:00 PM I have a 1979 ENDT 675 Mack engine. Recently it has developed a surge at about 1500 rpm's unless the engine is under a load. Nothing around 1200 or upwards of about 1900. When it does surge the boost gauge remains steady. I don't think it is throttle linkage, but I could be wrong. Haven't tilted the cab to really look at it yet. It is definitely rpm related and not truck speed related. Any ideas as to where to start? You guys were awesome help a couple years back when the engine dropped an exhaust valve in helping me source parts and do the repair. nobody in my area wanted to work on this old truck and I am a light truck mechanic so it was definitely a learning experience for me. TIA Rob Shane RS Disposal LLC Quote Link to comment https://www.bigmacktrucks.com/topic/76164-occasional-engine-surge/ Share on other sites More sharing options...
fjh Posted 7 hours ago Share Posted 7 hours ago can you identify the fuel pump for us! Robert bosch or ABAC? Quote Link to comment https://www.bigmacktrucks.com/topic/76164-occasional-engine-surge/#findComment-585793 Share on other sites More sharing options...
RS Disposal Posted 5 hours ago Author Share Posted 5 hours ago 2 hours ago, fjh said: can you identify the fuel pump for us! Robert bosch or ABAC? I csn try and look at it when I get to the truck tonite. Not sure how I would tell. What should I be looking for as far as the difference. Like I have stated I'm not really a heavy diesel mechanic. I can take a pic and upload it Quote Link to comment https://www.bigmacktrucks.com/topic/76164-occasional-engine-surge/#findComment-585813 Share on other sites More sharing options...
D-Day Posted 3 hours ago Share Posted 3 hours ago There should be a tag riveted to the side of the pump that will tell you what pump you have and the pump number Quote Link to comment https://www.bigmacktrucks.com/topic/76164-occasional-engine-surge/#findComment-585821 Share on other sites More sharing options...
fjh Posted 2 hours ago Share Posted 2 hours ago 2 hours ago, RS Disposal said: I can take a pic and upload it I can take a pic and upload it do so please! I’m not a numbers guy! In an Ambac Pune there is an over speed clutch that can start slipping! And this can lead to a run away! Quote Link to comment https://www.bigmacktrucks.com/topic/76164-occasional-engine-surge/#findComment-585827 Share on other sites More sharing options...
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