kahall82 Posted April 20, 2014 Share Posted April 20, 2014 Hi all,Finally getting around to try to stop the roll in my 1982 R Model 350 E6 engine.Have been trying to find a pic of where the buffer screw is located.Is it the screw in the pic on the rear side of the injection pump?Thanks in advance! Quote Link to comment Share on other sites More sharing options...
br549 Posted April 20, 2014 Share Posted April 20, 2014 That screw in the picture is the switch that controls the Dyntard engine brake. Pump usually has to be removed and sent to a pump shop to fix it. 1 Quote Link to comment Share on other sites More sharing options...
theakerstwo Posted April 20, 2014 Share Posted April 20, 2014 Send in for rebuild 1 Quote glenn akers Link to comment Share on other sites More sharing options...
kahall82 Posted April 20, 2014 Author Share Posted April 20, 2014 Any help as to where it is located would be fantastic Quote Link to comment Share on other sites More sharing options...
39 Baby Mack Posted April 20, 2014 Share Posted April 20, 2014 The buffer screw you're referring to I've only seen on a 2 stroke Detroit.Usually when a Mack does this the flyweights in the governor are worn and as stated above the pump should be removed and sent to a reputable pump shop for repair and recalibration.Ron Quote Link to comment Share on other sites More sharing options...
theakerstwo Posted April 21, 2014 Share Posted April 21, 2014 The buffer screw story gets started by drivers that having fun out of other drivers.years back that was a common request to set my buffer screw and when your in there clean the smoke off of my injectors.Another thing I have been asked to do many times is to change the button in a two cycle DD.Or set the rack on my mack. Quote glenn akers Link to comment Share on other sites More sharing options...
gearhead204 Posted April 21, 2014 Share Posted April 21, 2014 KAHALL82 what is your complaint with the pump, erratic low idle? what is you idle speed? Quote Link to comment Share on other sites More sharing options...
kahall82 Posted April 21, 2014 Author Share Posted April 21, 2014 gearhead204 please see my previous post. It has video of the truck on you-tube.This is my original description - Seems to pulse on idle (sometimes it is fine though) and really pulses when you just touch the accelerator as you can hear in the YouTube clip. You really need to put your foot down but when you change to the next gear it does the same until you really put your foot down. http://www.bigmacktrucks.com/index.php?/topic/34007-r-model-320-coolpower-hard-to-drive-pulsing-r612rst/ Quote Link to comment Share on other sites More sharing options...
gearhead204 Posted April 21, 2014 Share Posted April 21, 2014 :SMOKIE-LFT:I think it needs a pump shop to show it some love, sorry I know you didn't want to hear that Quote Link to comment Share on other sites More sharing options...
kahall82 Posted April 21, 2014 Author Share Posted April 21, 2014 Thanks everyone. Hopefully it isn't the pump. If we find the solution I will post it up.If anyone else has any ideas don't be afraid to post! Thanks again! Quote Link to comment Share on other sites More sharing options...
kahall82 Posted April 21, 2014 Author Share Posted April 21, 2014 Another thing it starts first time every time. Only started about 4 times a year in the past 3 years and before that sat around.And it doesn't do it all the time. Hasn't burnt any oil as the oil is still clean after 3 years...with a few trips on the road but mostly sitting around. Does that sound like something is wrong with either the pump or head? Quote Link to comment Share on other sites More sharing options...
blackdog2 Posted April 21, 2014 Share Posted April 21, 2014 Does it have a air ride cab!! Quote Ed Link to comment Share on other sites More sharing options...
kahall82 Posted April 21, 2014 Author Share Posted April 21, 2014 Just saying...pour it in a pan and i might cook my steak in it looks that clean. Everyone always says the oil goes black straight away after you put it in. Maybe they are just making the poster feel better about their dirty oil Quote Link to comment Share on other sites More sharing options...
Bobby j Posted April 21, 2014 Share Posted April 21, 2014 The buffer screw you're referring to I've only seen on a 2 stroke Detroit.Usually when a Mack does this the flyweights in the governor are worn and as stated above the pump should be removed and sent to a reputable pump shop for repair and recalibration.Ron. I second this all Mack's I had this problem was internal......only other thing I remember look real close at your accel. Lever on pump shaft make sure not loose or no cracks.....my two cent......bobby j. Quote Link to comment Share on other sites More sharing options...
buster brown Posted April 25, 2014 Share Posted April 25, 2014 Does it have a air ride cab!!I am with blackdog2. Is the cab have air ride? Quote Link to comment Share on other sites More sharing options...
fjh Posted April 27, 2014 Share Posted April 27, 2014 Make sure the throttle lever has no wear at the throttle shaft If the lever internal springs are worn it will cause the idle to be erratic .if the lever is good then the governor is worn and heeds to be removed and repaired!OR just live with it! Quote Link to comment Share on other sites More sharing options...
kahall82 Posted April 30, 2014 Author Share Posted April 30, 2014 Thanks for all the responses. Will put it in the shop. Called up a few places to ask advice and more than likely the govenor is worn as per previous responses n here. Will let you know the results! Quote Link to comment Share on other sites More sharing options...
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