Hack Posted April 15, 2022 Share Posted April 15, 2022 Trucks in the shop because the gear broke off the shaft. Is it made as one piece or are they milled together? And is there a special tool needed to remove the cam? Any help is greatly appreciated. Quote Link to comment https://www.bigmacktrucks.com/topic/69540-mack-mp8-fuel-pump-timing-gear-and-cam-removal/ Share on other sites More sharing options...
fjh Posted April 15, 2022 Share Posted April 15, 2022 (edited) There is a whole bunch of tools you could by to assist in the removal of the rockers and cam! That said there's not anything you can't improvise ! You need some heavy rubber bands to tie the engine brake slaves in place There is a special hook affair to lift the cam out a strap and patients will work! You need to mark the gear to the bull gear! Bla bla bla! This said Check the bull gear these have had issues with coming loose! something caused the cam to break! BEFORE you dig to far you may have a deeper can of worms there! take a bar and check for any side play in that bull gear! There are guys here with may more MP8 experience than my self so wait for a response from Some of the others ! Just sayin! Edited April 15, 2022 by fjh 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69540-mack-mp8-fuel-pump-timing-gear-and-cam-removal/#findComment-495404 Share on other sites More sharing options...
Hack Posted April 15, 2022 Author Share Posted April 15, 2022 The cam didn't break the Mechanic said somebody told him he needs a special tool to remove it. What broke was the gear that sits at the back of the motor that runs the fuel pump it broke off the shaft and he's not sure if the gear and shaft is one piece or if their milled together. Quote Link to comment https://www.bigmacktrucks.com/topic/69540-mack-mp8-fuel-pump-timing-gear-and-cam-removal/#findComment-495406 Share on other sites More sharing options...
Mackpro Posted April 15, 2022 Share Posted April 15, 2022 The gear does comes off the fuel supply pump. No special tools needed . I’d be more worried about the idler gear that runs the fuel pump gear. This could turn into a extremely large expensive repair real quick, 2 Quote Link to comment https://www.bigmacktrucks.com/topic/69540-mack-mp8-fuel-pump-timing-gear-and-cam-removal/#findComment-495409 Share on other sites More sharing options...
Onyx610 Posted April 15, 2022 Share Posted April 15, 2022 (edited) The tandem pump gear? It’s a threaded shaft…There’s a nut on it. Edited April 15, 2022 by Onyx610 Quote Link to comment https://www.bigmacktrucks.com/topic/69540-mack-mp8-fuel-pump-timing-gear-and-cam-removal/#findComment-495410 Share on other sites More sharing options...
Onyx610 Posted April 15, 2022 Share Posted April 15, 2022 Everyone of those gears comes off Quote Link to comment https://www.bigmacktrucks.com/topic/69540-mack-mp8-fuel-pump-timing-gear-and-cam-removal/#findComment-495411 Share on other sites More sharing options...
Hack Posted April 15, 2022 Author Share Posted April 15, 2022 Okay. He won't sure how it was made. The shaft broke then. I got them checking the bull gear and everything else. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69540-mack-mp8-fuel-pump-timing-gear-and-cam-removal/#findComment-495415 Share on other sites More sharing options...
fjh Posted April 15, 2022 Share Posted April 15, 2022 8 minutes ago, Hack said: Okay. He won't sure how it was made. The shaft broke then. I got them checking the bull gear and everything else. As pro mentioned Could get pricey in a hurry !the bull wheel can make a hell of a mess! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69540-mack-mp8-fuel-pump-timing-gear-and-cam-removal/#findComment-495416 Share on other sites More sharing options...
Hack Posted April 15, 2022 Author Share Posted April 15, 2022 He quoted me for 20k but I won't hold my breath. The owner said they've done plenty of them so I'm hoping it won't take them long they got it pulled apart other than taking the upper part to get the cam out. They gotta find a plate from when the gear broke off it waddled the hole out and the gotta find that shaft Quote Link to comment https://www.bigmacktrucks.com/topic/69540-mack-mp8-fuel-pump-timing-gear-and-cam-removal/#findComment-495417 Share on other sites More sharing options...
fjh Posted April 15, 2022 Share Posted April 15, 2022 3 minutes ago, Hack said: He quoted me for 20k but I won't hold my breath. The owner said they've done plenty of them so I'm hoping it won't take them long they got it pulled apart other than taking the upper part to get the cam out. They gotta find a plate from when the gear broke off it waddled the hole out and the gotta find that shaft Hopefully the whole back of the engine don't got to come off! however your not likely going to get off with out doing that! Big project! Quote Link to comment https://www.bigmacktrucks.com/topic/69540-mack-mp8-fuel-pump-timing-gear-and-cam-removal/#findComment-495418 Share on other sites More sharing options...
Hack Posted April 15, 2022 Author Share Posted April 15, 2022 He's already pulled back off. Getting him to go ahead and replace the clutch. I'm ready to get back on the road though 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69540-mack-mp8-fuel-pump-timing-gear-and-cam-removal/#findComment-495419 Share on other sites More sharing options...
Joey Mack Posted April 15, 2022 Share Posted April 15, 2022 (edited) My quick opinion,,, the tranny needs comes out to do a gear train job... jojo Edited April 16, 2022 by Joey Mack More content needed Quote Link to comment https://www.bigmacktrucks.com/topic/69540-mack-mp8-fuel-pump-timing-gear-and-cam-removal/#findComment-495427 Share on other sites More sharing options...
Hack Posted April 26, 2022 Author Share Posted April 26, 2022 They're gonna pull the motor out to do it Quote Link to comment https://www.bigmacktrucks.com/topic/69540-mack-mp8-fuel-pump-timing-gear-and-cam-removal/#findComment-496111 Share on other sites More sharing options...
Joey Mack Posted April 26, 2022 Share Posted April 26, 2022 Excelent... the last one I did, I pulled the engine.. it made for a smoother, mistake free repair.. jojo 1 Quote Link to comment https://www.bigmacktrucks.com/topic/69540-mack-mp8-fuel-pump-timing-gear-and-cam-removal/#findComment-496114 Share on other sites More sharing options...
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