skydawg Posted September 30, 2022 Share Posted September 30, 2022 The fuel pump on my 1961 B61 doesn`t have a priming plunger on the fuel pump,just a knurled cap.I think it`s the original engine.The number on the timing cover is ENDT673-74-10.Is this the right setup? Thanks. Quote Link to comment https://www.bigmacktrucks.com/topic/70508-b613t-engine/ Share on other sites More sharing options...
skydawg Posted October 3, 2022 Author Share Posted October 3, 2022 I`ll try again.My ENDT673 engine doesn`t have a priming plunger on the fuel(lift) pump,just a knurled cap.I haven`t seen this in other pics of this motor.Can anyone tell me if this was the norm in 1961? Thanks. Quote Link to comment https://www.bigmacktrucks.com/topic/70508-b613t-engine/#findComment-510891 Share on other sites More sharing options...
tjc transport Posted October 3, 2022 Share Posted October 3, 2022 i have seen them both ways with primer pump, and also without. Quote when you are up to your armpits in alligators, it is hard to remember you only came in to drain the swamp.. Link to comment https://www.bigmacktrucks.com/topic/70508-b613t-engine/#findComment-510892 Share on other sites More sharing options...
Freightrain Posted October 3, 2022 Share Posted October 3, 2022 Might have just been removed at some point for some reason? 1 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/70508-b613t-engine/#findComment-510897 Share on other sites More sharing options...
doubleclutchinweasel Posted October 3, 2022 Share Posted October 3, 2022 38 minutes ago, Freightrain said: Might have just been removed at some point for some reason? They did sometimes develop leaks. 2 Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/70508-b613t-engine/#findComment-510898 Share on other sites More sharing options...
mowerman Posted October 3, 2022 Share Posted October 3, 2022 Yes I was going to say that…. my 62 Add 66 both had them pretty handy … Bob Quote Link to comment https://www.bigmacktrucks.com/topic/70508-b613t-engine/#findComment-510930 Share on other sites More sharing options...
mowerman Posted October 3, 2022 Share Posted October 3, 2022 I have so many air leaks in my fuel system that it doesn’t even work anymore I have to blow air into the fuel tank to get it started ha ha… Bob Quote Link to comment https://www.bigmacktrucks.com/topic/70508-b613t-engine/#findComment-510931 Share on other sites More sharing options...
skydawg Posted October 4, 2022 Author Share Posted October 4, 2022 Is there another way to prime the pump when the plunger isn`t there? Quote Link to comment https://www.bigmacktrucks.com/topic/70508-b613t-engine/#findComment-510975 Share on other sites More sharing options...
mechohaulic Posted October 4, 2022 Share Posted October 4, 2022 with the fuel filters fuel of CLEAN fuel; remove cap on fuel tank air hose and rag in filler; with LOW air pressure ;pressurize the tank. have two tanks use the one that does NOT have the return hose. one tank have to disconnect return hose ,cap the line to tank (use vise grip pliers). fuel shut off in run position.sometimes pedal down and this is done with the engine OFF> many times the hand pump is more of a hassle. have seen the lock screw loosen and primer is bouncing up and down with fuel leaking . it was helpful back then to keep a couple hand primers in the toolbox for those road calls . doesnt do much good now though. Quote Link to comment https://www.bigmacktrucks.com/topic/70508-b613t-engine/#findComment-510977 Share on other sites More sharing options...
skydawg Posted October 4, 2022 Author Share Posted October 4, 2022 Thanks for that,Mechohaulic.I only have 1 fuel filter,don`t know if the other one got ditched along the way. Quote Link to comment https://www.bigmacktrucks.com/topic/70508-b613t-engine/#findComment-510978 Share on other sites More sharing options...
james j neiweem Posted October 4, 2022 Share Posted October 4, 2022 See if you can find a rebuilt plunger at an injection shop Quote Link to comment https://www.bigmacktrucks.com/topic/70508-b613t-engine/#findComment-510991 Share on other sites More sharing options...
skydawg Posted October 4, 2022 Author Share Posted October 4, 2022 So the plunger just threads into the pump,no other parts? Quote Link to comment https://www.bigmacktrucks.com/topic/70508-b613t-engine/#findComment-510993 Share on other sites More sharing options...
terry Posted October 4, 2022 Share Posted October 4, 2022 24 minutes ago, skydawg said: So the plunger just threads into the pump,no other parts? Should be two nuts on top of lift pump, with plastic check valves under them, be sure to put the primer on the one that draws from the tank. terry 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70508-b613t-engine/#findComment-510994 Share on other sites More sharing options...
Freightrain Posted October 4, 2022 Share Posted October 4, 2022 You can see the plunger on my 237. 1 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/70508-b613t-engine/#findComment-510995 Share on other sites More sharing options...
Popular Post mowerman Posted October 4, 2022 Popular Post Share Posted October 4, 2022 I am made this up works like a champ got everything at Home Depot hose and clamps plumbing department And the chrome dome is the cap on a chain-link fence post drilled a hole for the nipple I run about 20 pounds into the fuel tank for about 10 minutes starts right up… bob 3 Quote Link to comment https://www.bigmacktrucks.com/topic/70508-b613t-engine/#findComment-511005 Share on other sites More sharing options...
mowerman Posted October 4, 2022 Share Posted October 4, 2022 I understand caterpillar use them also you might be able to check over there good luck… bob Quote Link to comment https://www.bigmacktrucks.com/topic/70508-b613t-engine/#findComment-511006 Share on other sites More sharing options...
doubleclutchinweasel Posted October 4, 2022 Share Posted October 4, 2022 Nothing like a pressure-filled fluid system! Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/70508-b613t-engine/#findComment-511008 Share on other sites More sharing options...
mowerman Posted October 4, 2022 Share Posted October 4, 2022 Yes I would not doubt some of those fuel lines are stock. They will all be changed in due time ha ha whenever that will be bob Quote Link to comment https://www.bigmacktrucks.com/topic/70508-b613t-engine/#findComment-511011 Share on other sites More sharing options...
mowerman Posted October 4, 2022 Share Posted October 4, 2022 Believe it or not I change the fuel filter a couple of years ago and I was able to get one through cross reference at AutoZone I thought I would try there since they’re only 2 miles from here Quote Link to comment https://www.bigmacktrucks.com/topic/70508-b613t-engine/#findComment-511012 Share on other sites More sharing options...
doubleclutchinweasel Posted October 4, 2022 Share Posted October 4, 2022 Yeah, once in a while... Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/70508-b613t-engine/#findComment-511016 Share on other sites More sharing options...
doubleclutchinweasel Posted October 5, 2022 Share Posted October 5, 2022 Incidentally, I bought some off-brand primer to put in the R once, because the original was leaking. The new one worked, but I never could get it to seal in the housing. Leaked around the threads. Bought a set of seals from a pump shop in Knoxville and rebuilt the factory piece. Worked fine from then on. 1 Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/70508-b613t-engine/#findComment-511087 Share on other sites More sharing options...
Popular Post D2Denny Posted October 7, 2022 Popular Post Share Posted October 7, 2022 Here is a tip on pressurizing a fuel system: Cut an 8 or 9 inch circle around the valve stem in an old innertube. Secure it to the fuel tank filler neck with a large hose clamp. Pressure the tank up to 5 to 8 PSI through the valve stem and bleed the system. I have done this numerous times both on trucks and old Cat equipment. I keep one and an assortment of clamps in my traveling tool box. 3 Quote Link to comment https://www.bigmacktrucks.com/topic/70508-b613t-engine/#findComment-511267 Share on other sites More sharing options...
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