Jpri Posted May 15, 2021 Share Posted May 15, 2021 This has happened to me twice now. The linkage is not getting stuck but the motor stays at whatever rpm I was running at for about 10 seconds. The first time I was putting down a road at low rpm and when I came up to a stop sign it just stayed at 1100. Today I was heading down the Hwy full acceleration from stop lights and it stuck full throttle. The accelerator and linkage moved freely and doesn’t seem like a runaway engine because the rpm didn’t increase. Any ideas? It’s a 80 super liner with a 671 315 hp. Quote Link to comment https://www.bigmacktrucks.com/topic/66706-engine-stays-revving-after-release-of-accelerator/ Share on other sites More sharing options...
alex g Posted May 15, 2021 Share Posted May 15, 2021 Return spring on linkage at pump worn out or missing? Quote Link to comment https://www.bigmacktrucks.com/topic/66706-engine-stays-revving-after-release-of-accelerator/#findComment-473924 Share on other sites More sharing options...
theakerstwo Posted May 15, 2021 Share Posted May 15, 2021 Or the rack is sticking 1 Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/66706-engine-stays-revving-after-release-of-accelerator/#findComment-473926 Share on other sites More sharing options...
fjh Posted May 15, 2021 Share Posted May 15, 2021 2 hours ago, Jpri said: This has happened to me twice now. The linkage is not getting stuck but the motor stays at whatever rpm I was running at for about 10 seconds. The first time I was putting down a road at low rpm and when I came up to a stop sign it just stayed at 1100. Today I was heading down the Hwy full acceleration from stop lights and it stuck full throttle. The accelerator and linkage moved freely and doesn’t seem like a runaway engine because the rpm didn’t increase. Any ideas? It’s a 80 super liner with a 671 315 hp. Is this an inline six or V? you may have one bad injector causing this! Quote Link to comment https://www.bigmacktrucks.com/topic/66706-engine-stays-revving-after-release-of-accelerator/#findComment-473928 Share on other sites More sharing options...
mrgumby Posted May 16, 2021 Share Posted May 16, 2021 Pull the top of the govener box and check the govener spring and linkage for binding Quote Link to comment https://www.bigmacktrucks.com/topic/66706-engine-stays-revving-after-release-of-accelerator/#findComment-473937 Share on other sites More sharing options...
Onyx610 Posted May 16, 2021 Share Posted May 16, 2021 1 hour ago, mrgumby said: Pull the top of the govener box and check the govener spring and linkage for binding +1 Quote Link to comment https://www.bigmacktrucks.com/topic/66706-engine-stays-revving-after-release-of-accelerator/#findComment-473942 Share on other sites More sharing options...
Jpri Posted May 16, 2021 Author Share Posted May 16, 2021 Thanks I’ll take a look at that Quote Link to comment https://www.bigmacktrucks.com/topic/66706-engine-stays-revving-after-release-of-accelerator/#findComment-473958 Share on other sites More sharing options...
Jpri Posted May 16, 2021 Author Share Posted May 16, 2021 Thanks for pointing me in the right direction, after doing some research it is most definitely a governor issue. It looks like a bolt on assembly, can it be removed and replaced without messing with calibration of the pump? If so where can I buy one or the parts inside of it for that matter? I can’t find anything online except for rebuilt pumps. Quote Link to comment https://www.bigmacktrucks.com/topic/66706-engine-stays-revving-after-release-of-accelerator/#findComment-473963 Share on other sites More sharing options...
mrgumby Posted May 16, 2021 Share Posted May 16, 2021 (edited) https://dieselpro.com/. https://www.powerlinecomponents.com/catalog/detroit-diesel-71/55/variable-speed-governor Edited May 16, 2021 by mrgumby Quote Link to comment https://www.bigmacktrucks.com/topic/66706-engine-stays-revving-after-release-of-accelerator/#findComment-473967 Share on other sites More sharing options...
Jpri Posted May 16, 2021 Author Share Posted May 16, 2021 A little confusion on the engine sorry for that, but it is a 671 e6 Mack 315 hp Quote Link to comment https://www.bigmacktrucks.com/topic/66706-engine-stays-revving-after-release-of-accelerator/#findComment-473968 Share on other sites More sharing options...
theakerstwo Posted May 16, 2021 Share Posted May 16, 2021 You mean a 673 mack engine because a 671 is a detroit diesel Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/66706-engine-stays-revving-after-release-of-accelerator/#findComment-473969 Share on other sites More sharing options...
Jpri Posted May 17, 2021 Author Share Posted May 17, 2021 I believe your right, I don’t know why I thought it was a 671 ci. I just bought this this and still figuring everything out. Quote Link to comment https://www.bigmacktrucks.com/topic/66706-engine-stays-revving-after-release-of-accelerator/#findComment-473973 Share on other sites More sharing options...
fjh Posted May 17, 2021 Share Posted May 17, 2021 (edited) 13 hours ago, Jpri said: I believe your right, I don’t know why I thought it was a 671 ci. I just bought this this and still figuring everything out. K so on the older 315 MACK engine there was a bunch Monkey motion springs and linkage behind the pump make sure that stuff, if its still there isn't binding or causing issues if its there get rid of it! Also check your throttle lever on the side of the pump for a broken spring Its spring loaded and can cause the rpm to float wildly! Edited May 17, 2021 by fjh Quote Link to comment https://www.bigmacktrucks.com/topic/66706-engine-stays-revving-after-release-of-accelerator/#findComment-473987 Share on other sites More sharing options...
Jpri Posted May 17, 2021 Author Share Posted May 17, 2021 All the linkage and springs look good, I noticed another problem today,my Dynatard is not working. I was suspecting the governor and I just read somewhere that the Danatard is connected to the governor on the fuel injection pump also. I think I’m going to get an injector pump for it and throw it on there and see if that works. I don’t think there’s any point of looking inside the governor housing and trying to figure out what’s wrong with it because I cannot find parts anywhere online if I did see something was broken. Quote Link to comment https://www.bigmacktrucks.com/topic/66706-engine-stays-revving-after-release-of-accelerator/#findComment-474010 Share on other sites More sharing options...
theakerstwo Posted May 17, 2021 Share Posted May 17, 2021 Try taking the dnytard switch off Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/66706-engine-stays-revving-after-release-of-accelerator/#findComment-474019 Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.