Mrbertnh Posted September 13, 2022 Share Posted September 13, 2022 Engine was running as expected and then three weeks later when started it went to max rpm and will not idle. throttle linkage was checked and all appropriate still will not start and run it at idle. It’s not a runaway just goes to max RPM. Have to stall eng to stop the shut off will not stop it. Quote Link to comment Share on other sites More sharing options...
Popular Post theakerstwo Posted September 13, 2022 Popular Post Share Posted September 13, 2022 Stuck rack in governor 3 Quote glenn akers Link to comment Share on other sites More sharing options...
skydawg Posted September 13, 2022 Share Posted September 13, 2022 How do you stall it when this happens? Quote Link to comment Share on other sites More sharing options...
Freightrain Posted September 13, 2022 Share Posted September 13, 2022 You can pull the cover off the injection pump and free up the rack. I had a couple plungers stuck on my 237 when I bought it. A screwdriver and some WD40 got them freed up. 1 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment Share on other sites More sharing options...
Mrbertnh Posted September 13, 2022 Author Share Posted September 13, 2022 Thank-you for the responses. Took the side cover off and this is what I found. #6 spring is jammed. I have tapped it and soaked it and it hasn’t’t released. Any suggestions or do I need to take it out, and how would that be done? Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted September 13, 2022 Share Posted September 13, 2022 I wonder if you can use carb cleaner spray to break down the sludge, then wash out with WD-40?? jojo Quote Link to comment Share on other sites More sharing options...
theakerstwo Posted September 13, 2022 Share Posted September 13, 2022 Its the plunger sticking inside the barrel 1 Quote glenn akers Link to comment Share on other sites More sharing options...
Draggin Wagon Posted September 14, 2022 Share Posted September 14, 2022 Keep tinkering with it, it is just testing your patience 1 Quote Link to comment Share on other sites More sharing options...
Popular Post mechohaulic Posted September 14, 2022 Popular Post Share Posted September 14, 2022 my number one priority would be to jam a rag in that drain hole to stop metal contamination going further in the oil system. 3 Quote Link to comment Share on other sites More sharing options...
h67st Posted September 14, 2022 Share Posted September 14, 2022 On 9/13/2022 at 9:34 AM, skydawg said: How do you stall it when this happens? Flat, smooth piece of metal or wood--cover up the air intake and it'll shut down. Quote Link to comment Share on other sites More sharing options...
doubleclutchinweasel Posted September 14, 2022 Share Posted September 14, 2022 Gotta echo what Glenn said. Springs don't get stuck. The plunger that the spring is attached to is what is stuck. 1 Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment Share on other sites More sharing options...
mechohaulic Posted September 15, 2022 Share Posted September 15, 2022 8 hours ago, h67st said: Flat, smooth piece of metal or wood--cover up the air intake and it'll shut down. one thing to keep in mind, much like the emergency shut off on the DD's ;; it called emergency for a reason. too many times of use it will suck in the seals on a turbo. engine at over high speed wants air from some where till it starves. a pair of vise grips flatting out the fuel supply line in some cases will be faster than taking off the intake hose to access the intake, NOT saying the flat piece is wrong;; anything to shut down a run away fastest .in total agreement regards to the plunger being the cause. Quote Link to comment Share on other sites More sharing options...
Mrbertnh Posted September 27, 2022 Author Share Posted September 27, 2022 I got the plunger unstuck and took the truck for a short ride. Ran well until another got stuck. Winterized now and will work on it in the spring. Thanks again for all the responses. 2 Quote Link to comment Share on other sites More sharing options...
Freightrain Posted September 28, 2022 Share Posted September 28, 2022 So is it oil lubrication or fuel lubrication that controls that? Time for some fuel additive and let it run before parking it? 1 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment Share on other sites More sharing options...
Brocky Posted September 28, 2022 Share Posted September 28, 2022 I agree with Larry.. Your picture of Sept 13 shows a lot of GOOP around the springs, is there more elsewhere???? I would get this stuck one loose and get the lube changed and let it run for a while before parking it for the winter.. A long inactive period might just set things up worse?????????????? 2 Quote Brocky Link to comment Share on other sites More sharing options...
Freightrain Posted September 29, 2022 Share Posted September 29, 2022 Get it running and pull the hand throttle out to like 1000 rpm. Let it run for 1/2hr or so. Make sure the temp is up, block radiator if shutters don't work. 1 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment Share on other sites More sharing options...
mechohaulic Posted September 29, 2022 Share Posted September 29, 2022 remember if you are going to block the radiator with cardboard ; do it slowly. have seen a cardboard thrown in front of a running radiator because "it was cool to see it stick there" . the quick negative draw will bend a fan blade into the radiator. more with the plastic fans then the older metal ones. 1 Quote Link to comment Share on other sites More sharing options...
terry Posted September 29, 2022 Share Posted September 29, 2022 2 hours ago, mechohaulic said: remember if you are going to block the radiator with cardboard ; do it slowly. have seen a cardboard thrown in front of a running radiator because "it was cool to see it stick there" . the quick negative draw will bend a fan blade into the radiator. more with the plastic fans then the older metal ones. AI don't think a 61 B model is going to have that kind of a fan problem, how about when the shutters are shut in cooler weather? terry 1 Quote Link to comment Share on other sites More sharing options...
theakerstwo Posted September 29, 2022 Share Posted September 29, 2022 Check for water in the fuel. Quote glenn akers Link to comment Share on other sites More sharing options...
Popular Post mechohaulic Posted September 29, 2022 Popular Post Share Posted September 29, 2022 15 hours ago, terry said: AI don't think a 61 B model is going to have that kind of a fan problem, how about when the shutters are shut in cooler weather? terry definitely agree on the B model not possibly having the problem BUT 1- statement said more with the plastic fans .2 - don't know if the metal fan removed and plastic installed.3- when the shutters closed the sound (negative draw) changed ; 4- have to keep these "youngsters" on their toes. 5 when plastic fans appeared ;; alot -not all shutters disappeared. 6- many time I have used cardboard to heat an engine. it's the method when placing the cardboard. less flex on older metal fans and possibly distance from fan to radiator was more, B's and others of the day didn't have AC condensers, trans coolers, intercooler radiators and whatever else was put up front .LOL 3 Quote Link to comment Share on other sites More sharing options...
Freightrain Posted October 1, 2022 Share Posted October 1, 2022 When I first started my 237 with no nose on the truck I used a piece of paper I had laying around. It stuck nicely and was not completely covering the whole radiator. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment Share on other sites More sharing options...
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