Will Posted August 3, 2022 Share Posted August 3, 2022 (edited) Hi just wondering how many shims go on the engine position sensor near the crankshaft on the front of the engine? end do any shims go on the other one on the bell housing? engine is a ea7 470 etech! any help would be great cheers Edited August 3, 2022 by Will Quote Link to comment Share on other sites More sharing options...
fjh Posted August 3, 2022 Share Posted August 3, 2022 Does it have shims now? Is it throwing a cam position code? Quote Link to comment Share on other sites More sharing options...
Mackpro Posted August 3, 2022 Share Posted August 3, 2022 The engine speed sensor on the flywheel housing usually will have no shims. But the book says to measure and shim if needed . The engine position sensor on the front that reads the camshaft will always have 1 shim or 2. They make .015 and .030” shims. Due to timing cover thickness difference and camshaft thrust washer wear it impossible to guess what shims are needed. I will try to locate the instructions and chart and post it here. 1 Quote Link to comment Share on other sites More sharing options...
Will Posted August 3, 2022 Author Share Posted August 3, 2022 Ok thanks, that would be great. The sensor on flywheel has no shims but the one on the camshaft has one and it is throwing an intermittent code under power Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted August 3, 2022 Share Posted August 3, 2022 yeah just take the shim off, put it in your pocket, and run the truck again.. yes there are 2 availble shims. yours is probably .030" .. see what happens.. jojo Quote Link to comment Share on other sites More sharing options...
Mackpro Posted August 3, 2022 Share Posted August 3, 2022 If you are throwing the 3-4 code . I will attach the bulletin on troubleshooting that code. However the service bulletin you need on shimming the sensor is SB-273-004 and I can’t seem to find it . I found that on high milage trucks , the camshaft thrust washer would be so worn that the cam would float back and forth and come to close to the sensor causing the 3-4 code. I would add an extra .015 shim and test drive and see what happens. Also replacing the vibration damper with a larger one helps on some early ETECH. Early ETECHs under 400 HP had the smaller damper/balancer. I know all Aset engines had the larger damper. https://f01.justanswer.com/HeavyEquipmentTech/7977f3ec-83db-47e4-9d6a-f6babf391cd7_Mack_Engine_pos_sensor_bulletin45-sb221037.pdf Quote Link to comment Share on other sites More sharing options...
Mackpro Posted August 3, 2022 Share Posted August 3, 2022 Also the came out with a new thicker timing cover with gussets on the engine position mounting location . Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted August 3, 2022 Share Posted August 3, 2022 there is a spec for cam shaft run out.. but tell me why every time I pull a cam, the thrust washer shows almost no wear.. am I wrong? as far as a different timing cover,, i truly dont know, other than the ASET-C I just built.. which had another 2, 10mm bolt hole topside. So tell me where the 'runout' would occur? I would like to know if I am missing something, before I build another E-Tech/ASET.. jojo Quote Link to comment Share on other sites More sharing options...
Mark T Posted August 3, 2022 Share Posted August 3, 2022 Not totally impossible for the truck to have drive line issues. U joints, carrier bearing (s) yikes. It can telegraph back to the engine. Rare but not impossible. Quote Link to comment Share on other sites More sharing options...
Mackpro Posted August 4, 2022 Share Posted August 4, 2022 4 hours ago, Joey Mack said: there is a spec for cam shaft run out.. but tell me why every time I pull a cam, the thrust washer shows almost no wear.. am I wrong? as far as a different timing cover,, i truly dont know, other than the ASET-C I just built.. which had another 2, 10mm bolt hole topside. So tell me where the 'runout' would occur? I would like to know if I am missing something, before I build another E-Tech/ASET.. jojo Your right on rarely seeing any wear on the cam thrust washer . Back in the ETECH days I had a couple of trucks that I was chasing the 3-4 code on . I kept getting different readings on measuring the timing cover to cam gear depth. I’d measure, then use the correct shims on the sensor and test drive and get a random 3-4 code active again. I’d come back and re-measure and get a different depth measurement. One of the old guys back then associated it with “Cam floating “ as he called it. Adding the .015” shim seemed to work. I was personally doing 3 cams jobs a week back then and now wondering if pressing the cam gear off with a 20 ton press could have slightly tweaked/bent the camshaft gear. This could explain different depth measurements depending on where the engine stopped spinning when turning it off. 1 1 Quote Link to comment Share on other sites More sharing options...
Dirtymilkman Posted August 4, 2022 Share Posted August 4, 2022 We were taught that you'll get run out from not having your clutch set up. If you're out of free pedal it's putting pressure on your crank thrust bearings. 1 1 Quote Link to comment Share on other sites More sharing options...
Mackpro Posted August 4, 2022 Share Posted August 4, 2022 This is a pic of the new and improved timing gear cover . If you zoom in you can see the gussets casted in around the hole for the engine position sensor. https://www.finditparts.com/products/8549180/mack-25102069?srcid=CHL01SCL010-Npla-Dmdt-Gusa-Svbr-Mmuu-K8549180-L187&srcid=CHL01SCL010&gclid=Cj0KCQjwuaiXBhCCARIsAKZLt3ma4VK_xs26tnv330HtNuUevV9EkCOYowYOx-Ywtwe2M_W-TW2TCQ8aAh1jEALw_wcB Quote Link to comment Share on other sites More sharing options...
Mackpro Posted August 4, 2022 Share Posted August 4, 2022 14 minutes ago, Dirtymilkman said: We were taught that you'll get run out from not having your clutch set up. If you're out of free pedal it's putting pressure on your crank thrust bearings. I have recently heard on the Volvo side that a few crankshafts have burned out the thrust bearings due to a clutch actuator issue on the I-shift transmissions. Even though the MP/M-drive on the Mack side is exactly the same parts it has seemed to only have shown up on the Volvo side. Quote Link to comment Share on other sites More sharing options...
fjh Posted August 4, 2022 Share Posted August 4, 2022 8 hours ago, Dirtymilkman said: We were taught that you'll get run out from not having your clutch set up. If you're out of free pedal it's putting pressure on your crank thrust bearings. We replaced Etech due the above situation last year forward thrust was right wasted ! They left it with out free pedal tooooo long! Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted August 4, 2022 Share Posted August 4, 2022 Mackpro, Interesting take on pressing the cam gear.. I just finished 2 in-frames last month.. so far no codes, but I also take car in pressing the gear off, and baking it right, before dropping it on.. I too remember doing cam after cam job back in the early 2000's.. crazy sh!t.. jojo Quote Link to comment Share on other sites More sharing options...
Mackpro Posted August 4, 2022 Share Posted August 4, 2022 6 minutes ago, Joey Mack said: Mackpro, Interesting take on pressing the cam gear.. I just finished 2 in-frames last month.. so far no codes, but I also take car in pressing the gear off, and baking it right, before dropping it on.. I too remember doing cam after cam job back in the early 2000's.. crazy sh!t.. jojo I was a whole lot younger back in them days . I probably couldn’t do 2 cam jobs a week now , LOL. We used a toaster oven to carefully heat the gear and put it on . But removing the gear was another story . Getting it into the press was a challenge. Finally found that cutting the camshaft in two about a foot from the gear made it easier to get into the press with out damaging the gear. Otherwise we were wrestling into the press and usually dropping it or banging into anything with in a 3 foot radius. Glad those days are over for me . 1 Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted August 4, 2022 Share Posted August 4, 2022 funny you say that, I recently have been cutting the cam in 2.. at #2 cyl. lobes... my thought was to remove about 60 pounds, and the distance from the gear was far enough, were the heat of cutting, didnt reach the gear hub.. It worked great and much easier to load into the press.. . jojo 1 Quote Link to comment Share on other sites More sharing options...
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