66rmack Posted September 23, 2015 Share Posted September 23, 2015 So I recently picked up a 70 r model for parts for my dads 66. The 237 that's in it ran two years ago. But they were pulling into a field and it quit running. The guy I bought it from said it did this about 10 years ago and it was the fuel pump gear broke. Is this a known thing? I would guess it's not and if it is indeed broken again either the pump is bad or possibly worn out timing gears/ out of time? Has any one had similar trouble? I'm just wondering what I can sort of expect and some ideas before I tear it apart, It seems to spin over fine by hand. With no binding. Any help is appreciated thank you. - Pete Quote Link to comment https://www.bigmacktrucks.com/topic/41912-237-problems/ Share on other sites More sharing options...
theakerstwo Posted September 23, 2015 Share Posted September 23, 2015 Turn the key on. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/41912-237-problems/#findComment-304939 Share on other sites More sharing options...
66rmack Posted September 23, 2015 Author Share Posted September 23, 2015 Sarcasm? Quote Link to comment https://www.bigmacktrucks.com/topic/41912-237-problems/#findComment-304943 Share on other sites More sharing options...
j hancock Posted September 24, 2015 Share Posted September 24, 2015 Have you put a pressure gauge on the fuel line to see what you have? There could be junk in the fuel after sitting so changing filters would be a place to start. Could be plugged up. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/41912-237-problems/#findComment-304949 Share on other sites More sharing options...
Underdog Posted September 24, 2015 Share Posted September 24, 2015 I think you should just buy my 237 and swap engines. Mine ran 2 years ago too. Complete sarcasm, but the part about my engine for sale is true.GreggSent from my XT1254 using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/41912-237-problems/#findComment-304950 Share on other sites More sharing options...
Lmackattack Posted September 24, 2015 Share Posted September 24, 2015 Crack the injector lines open and see if it is spitting fuel.. That will tell you if it's pumping. Quote Link to comment https://www.bigmacktrucks.com/topic/41912-237-problems/#findComment-304957 Share on other sites More sharing options...
39 Baby Mack Posted September 24, 2015 Share Posted September 24, 2015 The earlier 237's with the old drive(one with the ball bearings and small shaft) did have a reputation for breaking the shaft.This arrangement was used on the 673's and worked fine with 9mm plungers used in the 673 pumps.When they went to the 11mm plungers used in the ENDT 675 Maxidyne engine pumps they would fail.Ron 1 Quote Link to comment https://www.bigmacktrucks.com/topic/41912-237-problems/#findComment-304970 Share on other sites More sharing options...
39 Baby Mack Posted September 24, 2015 Share Posted September 24, 2015 If it has the old style pump adapter on the pump (one with the screw in core plug in it) take the plug out and look inside and seeif the shaft is turning when the engine is turned over.Ron 1 Quote Link to comment https://www.bigmacktrucks.com/topic/41912-237-problems/#findComment-304973 Share on other sites More sharing options...
66rmack Posted September 24, 2015 Author Share Posted September 24, 2015 If it is the old style and that is the problem, can it be converted to the newer style? Does anyone know if the parts are still available? Thank you I really appreciate the help. I can't wait to tear into it and get it figured out. Quote Link to comment https://www.bigmacktrucks.com/topic/41912-237-problems/#findComment-305033 Share on other sites More sharing options...
66rmack Posted October 20, 2015 Author Share Posted October 20, 2015 Ok so I got in to the engine a little bit and I seems that the shaft that bolts to the injection pump timing gear is broken. Is there a chance some one has a diagram? Or the name of the shaft? I have called a couple dealers with no luck at finding the part. It doesn't seem to have anything else wrong with it. Quote Link to comment https://www.bigmacktrucks.com/topic/41912-237-problems/#findComment-308193 Share on other sites More sharing options...
39 Baby Mack Posted November 7, 2015 Share Posted November 7, 2015 The later one consisted of an aluminum housing for the shaft to ride in (no bearings). The newer larger shaft. A special coupler between the shaft and pump drive(different size slots). The only real rub is you have drill a hole in the block to have the oil feed to the new aluminum housing to lubricate the shaft. Can't remember for sure exactly how this was done. But you had to drill a hole from an existing gallery in the block over to the bore where housing for the pump shaft sits in the block. It really wasn't that hard, just scarry being careful you didn't mess something up. You needed a long 1/8" drill bit (6" or 8" long), put grease on it to collect most of the shavings. There's a service bulletin for for it. I have one some where. I'm not going to look for it, my filing system is much too complicated!!! I'm sure someone else can find it much faster than I would be able to.RonSent from my SM-G900V using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/41912-237-problems/#findComment-310322 Share on other sites More sharing options...
66rmack Posted November 7, 2015 Author Share Posted November 7, 2015 Thank you for your info. I got the truck running by using the shaft out of my dads junk 250. I plan to upgrade the shaft. But as of now I'm not to worried about it. But if someone does have the info I would really apriciate it as I will do the upgrade at some point. Quote Link to comment https://www.bigmacktrucks.com/topic/41912-237-problems/#findComment-310404 Share on other sites More sharing options...
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