CocoSr Posted March 9, 2021 Share Posted March 9, 2021 Good Evening! Just want some input ....Should I have rods & mains bearings done on my mp8 since it has 745,000 miles on it ? Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/66190-rods-mains-bearings/ Share on other sites More sharing options...
0 Joey Mack Posted March 9, 2021 Share Posted March 9, 2021 You can drop the oil pump and the main at No.7 to check the health of the bearing and oil pump. It's a "Job". you have a large stiffing tray and oil pick/up tubing with orings to replace, and a boatload of bolts to remove.. You can also cut open the oil filters to check for metal flakes but thats still not going to pinpoint where the metal came from.. So my guess Is to weigh the reasons, and decide... The lower end Is a quaility lower end, and the work to do a good bearing job is much higher than an E-7/E-Tech..... I expect more comments from our Canadian friends on this one, as they are still working on this series of engine today. OK "V" and "F".. You're next.. Jojo 1 Quote Link to comment https://www.bigmacktrucks.com/topic/66190-rods-mains-bearings/#findComment-470294 Share on other sites More sharing options...
0 1958 F.W.D. Posted March 9, 2021 Share Posted March 9, 2021 Have you had a recent crankcase oil analysis done? For an average price of $20 it is a priceless tool to use. 1 1 Quote TWO STROKES ARE FOR GARDEN TOOLS Link to comment https://www.bigmacktrucks.com/topic/66190-rods-mains-bearings/#findComment-470301 Share on other sites More sharing options...
0 fjh Posted March 9, 2021 Share Posted March 9, 2021 (edited) Well as with the bottom end on the grey engine they are pretty tough if you have looked after the oil and the clutch adjustment ! I would leave it alone we have a fair few high milers here and any we have had apart usually for other reasons looked fine bearing Wise! As Joe stated its not a slam dunk to pull the pan and look like a gray engine! AS 58 said oil analysis is a good cheap check! Just my opinion! Edited March 9, 2021 by fjh 1 Quote Link to comment https://www.bigmacktrucks.com/topic/66190-rods-mains-bearings/#findComment-470303 Share on other sites More sharing options...
0 CocoSr Posted March 11, 2021 Author Share Posted March 11, 2021 On 3/9/2021 at 7:16 AM, Joey Mack said: You can drop the oil pump and the main at No.7 to check the health of the bearing and oil pump. It's a "Job". you have a large stiffing tray and oil pick/up tubing with orings to replace, and a boatload of bolts to remove.. You can also cut open the oil filters to check for metal flakes but thats still not going to pinpoint where the metal came from.. So my guess Is to weigh the reasons, and decide... The lower end Is a quaility lower end, and the work to do a good bearing job is much higher than an E-7/E-Tech..... I expect more comments from our Canadian friends on this one, as they are still working on this series of engine today. OK "V" and "F".. You're next.. Jojo I guess it’s more peace of mind for me Quote Link to comment https://www.bigmacktrucks.com/topic/66190-rods-mains-bearings/#findComment-470374 Share on other sites More sharing options...
0 CocoSr Posted March 11, 2021 Author Share Posted March 11, 2021 Thank You Gentlemen! 1sr try will be the oil analysis! You guys rock 👍 Quote Link to comment https://www.bigmacktrucks.com/topic/66190-rods-mains-bearings/#findComment-470375 Share on other sites More sharing options...
0 Joey Mack Posted March 11, 2021 Share Posted March 11, 2021 And that alone is reason enough.... Just do it right because there is no room for short cuts on this engine, any engine really, but this engine is a well designed piece of engineering and if you are going to do it.... do it right.... follow all torque procedures, replace the bolts as required, get the correct orings and so forth.. the oil pump does have a fits and limits for reuse, you may be surprised at what will pass inspection related to scratches and the little pitting that seems to happen to them.. I hope that "F: and "V" add to what I just said.. jojo 1 Quote Link to comment https://www.bigmacktrucks.com/topic/66190-rods-mains-bearings/#findComment-470377 Share on other sites More sharing options...
0 CocoSr Posted March 11, 2021 Author Share Posted March 11, 2021 Yes sir! I will feel better having them done I used to have an ISX and everyone said I didn’t need to touch it till a million I had it done @ 600,000 and they were bad Quote Link to comment https://www.bigmacktrucks.com/topic/66190-rods-mains-bearings/#findComment-470379 Share on other sites More sharing options...
0 CocoSr Posted March 11, 2021 Author Share Posted March 11, 2021 On 3/3/2021 at 9:33 PM, Mackpro said: It’s for your cab power. They do go bad . Mack later changed the set up to a large fuse instead of the breaker style you have . Quote Link to comment https://www.bigmacktrucks.com/topic/66190-rods-mains-bearings/#findComment-470380 Share on other sites More sharing options...
0 Joey Mack Posted March 11, 2021 Share Posted March 11, 2021 (edited) Keep in mind... the connecting rods are "Fractured"..... Be deliberate on how you handle them, check fitment accuracy upon reassembly.... Nothing to fear, just pay attention to the joint.. jojo Edited March 11, 2021 by Joey Mack too much info 1 Quote Link to comment https://www.bigmacktrucks.com/topic/66190-rods-mains-bearings/#findComment-470381 Share on other sites More sharing options...
0 1958 F.W.D. Posted March 11, 2021 Share Posted March 11, 2021 CoCo where are you located? 1 Quote TWO STROKES ARE FOR GARDEN TOOLS Link to comment https://www.bigmacktrucks.com/topic/66190-rods-mains-bearings/#findComment-470383 Share on other sites More sharing options...
0 CocoSr Posted March 11, 2021 Author Share Posted March 11, 2021 Central FL , Davenport Quote Link to comment https://www.bigmacktrucks.com/topic/66190-rods-mains-bearings/#findComment-470415 Share on other sites More sharing options...
0 doubleclutchinweasel Posted March 11, 2021 Share Posted March 11, 2021 19 hours ago, Joey Mack said: Keep in mind... the connecting rods are "Fractured"..... Be deliberate on how you handle them, check fitment accuracy upon reassembly.... Nothing to fear, just pay attention to the joint.. jojo Fractured rod joints are awesome. Perfect fit and incredible stability. 1 Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/66190-rods-mains-bearings/#findComment-470439 Share on other sites More sharing options...
0 1958 F.W.D. Posted March 11, 2021 Share Posted March 11, 2021 15 hours ago, CocoSr said: Central FL , Davenport Don't know any labs down there but most of the major CAT dealers have their own in-house labs and will analyze any make/model. 1 Quote TWO STROKES ARE FOR GARDEN TOOLS Link to comment https://www.bigmacktrucks.com/topic/66190-rods-mains-bearings/#findComment-470440 Share on other sites More sharing options...
0 CocoSr Posted March 11, 2021 Author Share Posted March 11, 2021 Thank You! Gonna ask my oil supplier about it Quote Link to comment https://www.bigmacktrucks.com/topic/66190-rods-mains-bearings/#findComment-470445 Share on other sites More sharing options...
0 Vmac3 Posted March 19, 2021 Share Posted March 19, 2021 Late in posting in this thread, but I have never done a bearing roll on a MP series engine. In fact I stopped doing them during the ASET days. Engine oil technology has come a long way. Also these new engines rarely ever have issues in the rotating assembly. Something causes the rotating assembly to fail, double idler gear and the aluminum shaving associated with it, blown turbo, fuel dilution and the likes. As long as the maintenance was always up to snuff then no need. Like Joey and F said, its a pain in the ass to get to the rods, mains and the oil pump. If you plan in doing this job, please be extra cautious because the stiffening plate is extremely sharp on one side and it will slice your hands like a hot knife through butter. Best tot take an oil sample and see what the lab finds. V 1 Quote Link to comment https://www.bigmacktrucks.com/topic/66190-rods-mains-bearings/#findComment-471047 Share on other sites More sharing options...
0 CocoSr Posted April 8, 2021 Author Share Posted April 8, 2021 Thanks so much Quote Link to comment https://www.bigmacktrucks.com/topic/66190-rods-mains-bearings/#findComment-472198 Share on other sites More sharing options...
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CocoSr
Good Evening!
Just want some input ....Should I have rods & mains bearings done on my mp8 since it has 745,000 miles on it ? Thanks
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