terry Posted yesterday at 01:59 PM Share Posted yesterday at 01:59 PM 2 hours ago, Freightrain said: Thanks guys. Kinda figured I just knocked it off or I would have a tool from the last time. I'll get to spraying it with oil now. Terry, yes, it bolts to a flange that slips onto crank. I remember warming it up in the oven to get it to slip on easily. I'm considering removing the inj. pump so I can regasket the side covers. How bad is it to get it back correctly? Timed? Etc? Here i go again, if i remenber there is a slotted adapter between pump and drive on engine and has a pin on it on each side so can on go back on one way, as long as nothing is moved timing would remain the same. terry 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/page/5/#findComment-579532 Share on other sites More sharing options...
Freightrain Posted yesterday at 03:02 PM Author Share Posted yesterday at 03:02 PM Yes, there is a spacer about 3-4" thick? So remove spacer with pump or pump from spacer? Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/page/5/#findComment-579540 Share on other sites More sharing options...
mechohaulic Posted yesterday at 03:57 PM Share Posted yesterday at 03:57 PM 17 hours ago, Freightrain said: What is the common way to get the balancer off the front of crank? No holes to use for puller. Get a real big one and grab around the outside? I don't remember what I did to the 237 when I removed it and swapped my 673? really depends on the conditions how. engine in frame with radiator in front limiting work area ? in frame no radiator? engine out ? important issue is DO NOT beat the balancer. with bolts removed ; had to make sure I put that in. don't laugh someone said " you didn't tell me take out the bolts!" good penetrating spray /& emery -sand paper ; clean off hub center . I've been able to rotate by hand the balancer work it forward off hub.(this is when radiator still in place. ) rail it with a hammer and the balancer won't balance any more. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/page/5/#findComment-579546 Share on other sites More sharing options...
Freightrain Posted yesterday at 05:31 PM Author Share Posted yesterday at 05:31 PM Motor on floor. Bolts out😉. I won't beat on it. Will try rotating it on hub first. 1 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/page/5/#findComment-579551 Share on other sites More sharing options...
mowerman Posted yesterday at 05:43 PM Share Posted yesterday at 05:43 PM man you been busy,,good luck larry 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/page/5/#findComment-579554 Share on other sites More sharing options...
other dog Posted yesterday at 05:50 PM Share Posted yesterday at 05:50 PM 10 minutes ago, mowerman said: man you been busy,,good luck larry Yeah, he makes me feel like a slacker...well, I kinda am- anyhow, I'm at the tire getting place having 4 tires put on my car now because I saw dry rot cracks in them. The tread isn't half worn out, but we all remember what happened with the red Ford pickup, they had good tread too. Then I'm going home and have a few cold ones before I cook Zina a smash burger. 2 Quote Producer of poorly photo-chopped pictures since 1999. Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/page/5/#findComment-579555 Share on other sites More sharing options...
mowerman Posted yesterday at 05:50 PM Share Posted yesterday at 05:50 PM On 7/17/2025 at 11:01 AM, Freightrain said: I remember a video from way back showing a big power KW getting out run by a Mack up a hill in Australia . The KW driver was like WTH! I tried searching for it but never find it. well for years,,macks were known to out pull comparable engines on a grade but for sure cummins would be faster off the line,,bob 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/page/5/#findComment-579556 Share on other sites More sharing options...
Popular Post mowerman Posted yesterday at 05:54 PM Popular Post Share Posted yesterday at 05:54 PM 1 minute ago, other dog said: Yeah, he makes me feel like a slacker. I'm at the tire getting place having 4 tires put on my car now because I saw dry rot cracks in them. The tread isn't half worn out, but we all remember what happened with the red Ford pickup, they had good tread too. Then I'm going home and have a few cold ones before I cook Zina a smash burgers. i think larry is making most of us feel like slugs,,,,but with all that high tech shit he's got ahead of him,,,, im getting tired just thinking of it,,lol bob 1 2 Quote Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/page/5/#findComment-579557 Share on other sites More sharing options...
terry Posted 21 hours ago Share Posted 21 hours ago 8 hours ago, Freightrain said: Yes, there is a spacer about 3-4" thick? So remove spacer with pump or pump from spacer? Are there pins on the spacer that mate up to drive on engine and pump drive? If so it only goes on one way. terry 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/page/5/#findComment-579575 Share on other sites More sharing options...
Freightrain Posted 20 hours ago Author Share Posted 20 hours ago No pins. You can see the color differences in the three parts so someone has been into it. The three bolts into drive looks solid,the four on pump look like they may "swivel"? Should I just pull front cover plate to see gears? Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/page/5/#findComment-579579 Share on other sites More sharing options...
Freightrain Posted 20 hours ago Author Share Posted 20 hours ago I got balancer off. No worries about beating it. Someone else already did. Couple good wallop marks on the back side. Balancer is red, so it came from something else. Little heat,PB, and casual persuasion and the pulley was loose, then balancer came off. If they had just put two tapped holes it would be painless. Engineers....ugh. 1 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/page/5/#findComment-579581 Share on other sites More sharing options...
terry Posted 16 hours ago Share Posted 16 hours ago 4 hours ago, Freightrain said: No pins. You can see the color differences in the three parts so someone has been into it. The three bolts into drive looks solid,the four on pump look like they may "swivel"? Should I just pull front cover plate to see gears? The slotted adapter with the pins is when you take the two top bolts and one bottom out that bolt to the block. You have a pic of the top two. terry 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/page/5/#findComment-579582 Share on other sites More sharing options...
Freightrain Posted 10 hours ago Author Share Posted 10 hours ago So taking the three bolts out will keep it in time, per say. As long as I don't rotate the crank? I know there are timing marks on the gears behind the cover. I cleaned up most of the dirt and will be pulling the main cover. There is more to reassembly, as I have skimmed my manual a few times. The manuals I have are for 675-676 motors. I suppose the basics are the same for assembly? 2 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/page/5/#findComment-579584 Share on other sites More sharing options...
mechohaulic Posted 6 hours ago Share Posted 6 hours ago 13 hours ago, Freightrain said: I got balancer off. No worries about beating it. Someone else already did. Couple good wallop marks on the back side. Balancer is red, so it came from something else. Little heat,PB, and casual persuasion and the pulley was loose, then balancer came off. If they had just put two tapped holes it would be painless. Engineers....ugh. glad you got balancer off safely. the rotating by hand is usually attempted when engine in chassis / radiator there or not: space limited . engine on floor (improperly blocked ) could be dangerous when hand rotation of damper done. block roll over . depending how bad those couple of wallops are , could effect balancer function. Quote Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/page/5/#findComment-579595 Share on other sites More sharing options...
mowerman Posted 2 hours ago Share Posted 2 hours ago dave ,,,your a moment buster..lol.bob Quote Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/page/5/#findComment-579601 Share on other sites More sharing options...
mrsmackpaul Posted 1 hour ago Share Posted 1 hour ago 8 hours ago, Freightrain said: So taking the three bolts out will keep it in time, per say. As long as I don't rotate the crank? No it won't keep it in time properly The pump can move the bolt hole section and I guess other things can move At least this what people that specialize in injector pumps have told me Every time the injector pump is removed the timing must be reset I know your gunna go, that makes sense at all you dumb ass I think the same answer as you and asked a different injector pump place and got the same answer, even asked the pump department at Mack and their specialist man said the same thing My thoughts would be, it can't effect it to much but it must have some effect What ever effect it has will be doubled as the injector pump will spin at half t he speed as the crank ? I wouldn't worry as I would spill time it once the motor is rebuilt anyway As this motor is new to you, you have no idea if it is timed correctly anyway so it can only be a bonus to check it is correct Paul 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/page/5/#findComment-579604 Share on other sites More sharing options...
Joey Mack Posted 1 hour ago Share Posted 1 hour ago Does that pump drive hub have the dowel pin in it like the 4 valve ? Quote Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/page/5/#findComment-579605 Share on other sites More sharing options...
steve s. Posted 56 minutes ago Share Posted 56 minutes ago Glenn Akers often said that every time the injection pump came off the engine it needed to b re-timed. Are you going to have the pump redone and set up for 2100 rpm? or leave it as it is? 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/page/5/#findComment-579608 Share on other sites More sharing options...
fjh Posted 37 minutes ago Share Posted 37 minutes ago 25 minutes ago, Joey Mack said: Does that pump drive hub have the dowel pin in it like the 4 valve ? Joey this engine may be old enough to have the tang drive ! Not the spline! Quote Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/page/5/#findComment-579609 Share on other sites More sharing options...
Joey Mack Posted 30 minutes ago Share Posted 30 minutes ago Thanks bud.. thats why i was asking. I have very little knowledge on these. I still have an ENDT 673 in my shop that I pick at, and it has the 'tang' a 4 pointed metal coupler. I have never timed one. I do have the Mack service book for it. I hope im smart enough to do it right.. Quote Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/page/5/#findComment-579611 Share on other sites More sharing options...
mrsmackpaul Posted 28 minutes ago Share Posted 28 minutes ago I have never seen a tang drive, only a dowl pin Paul Quote Link to comment https://www.bigmacktrucks.com/topic/75768-300-rebuild/page/5/#findComment-579614 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.