steeler Posted February 21, 2020 Share Posted February 21, 2020 1 hour ago, Truecountry said: zero compression on number one I had a feeling. Looks like you are pulling heads. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/61018-2006-mack-ai-427-misfire/page/2/#findComment-443390 Share on other sites More sharing options...
fjh Posted February 21, 2020 Share Posted February 21, 2020 yup Think your on a head trip!😡 1 Quote Link to comment https://www.bigmacktrucks.com/topic/61018-2006-mack-ai-427-misfire/page/2/#findComment-443407 Share on other sites More sharing options...
Truecountry Posted February 25, 2020 Author Share Posted February 25, 2020 Tomorrow im pulling back head I think the broken piece hit 4 or 5 and results broke rocker shaft Thanks Guys 1 Quote Link to comment https://www.bigmacktrucks.com/topic/61018-2006-mack-ai-427-misfire/page/2/#findComment-443659 Share on other sites More sharing options...
Truecountry Posted February 25, 2020 Author Share Posted February 25, 2020 Oh piston got hit a couple times but looks great and so is liner Quote Link to comment https://www.bigmacktrucks.com/topic/61018-2006-mack-ai-427-misfire/page/2/#findComment-443660 Share on other sites More sharing options...
fjh Posted February 25, 2020 Share Posted February 25, 2020 12 hours ago, Truecountry said: Oh piston got hit a couple times but looks great and so is liner Check your turbo! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/61018-2006-mack-ai-427-misfire/page/2/#findComment-443692 Share on other sites More sharing options...
Truecountry Posted February 26, 2020 Author Share Posted February 26, 2020 9 hours ago, fjh said: Check your turbo! I did looks Great no damage any where ….put other head and everything looks Great ...I cant figure out where that broken piece went too Quote Link to comment https://www.bigmacktrucks.com/topic/61018-2006-mack-ai-427-misfire/page/2/#findComment-443730 Share on other sites More sharing options...
OldRedMack Posted February 26, 2020 Share Posted February 26, 2020 3 hours ago, Truecountry said: I did looks Great no damage any where ….put other head and everything looks Great ...I cant figure out where that broken piece went too Maybe stuck in the manifold? 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/61018-2006-mack-ai-427-misfire/page/2/#findComment-443746 Share on other sites More sharing options...
fjh Posted February 26, 2020 Share Posted February 26, 2020 11 hours ago, OldRedMack said: Maybe stuck in the manifold? OR lodged in the turbo Snail! Quote Link to comment https://www.bigmacktrucks.com/topic/61018-2006-mack-ai-427-misfire/page/2/#findComment-443771 Share on other sites More sharing options...
Mack Technician Posted February 26, 2020 Share Posted February 26, 2020 Figure the moral of the story is you really, really, need to locate that chunk. Snail would be a fine lodge spot, esp since it’s likely a stock AI with tight clearances. Quote Link to comment https://www.bigmacktrucks.com/topic/61018-2006-mack-ai-427-misfire/page/2/#findComment-443774 Share on other sites More sharing options...
fjh Posted February 26, 2020 Share Posted February 26, 2020 3 minutes ago, Mack Technician said: Figure the moral of the story is you really, really, need to locate that chunk. Snail would be a fine lodge spot, esp since it’s likely a stock AI with tight clearances. Yup out come will likely be the same either way! Ah turbos are cheap!😁 Quote Link to comment https://www.bigmacktrucks.com/topic/61018-2006-mack-ai-427-misfire/page/2/#findComment-443775 Share on other sites More sharing options...
Truecountry Posted February 27, 2020 Author Share Posted February 27, 2020 10 hours ago, fjh said: OR lodged in the turbo Snail! 9 hours ago, fjh said: Yup out come will likely be the same either way! Ah turbos are cheap!😁 ill take turbo apart and look but I was thinking after cooler ..ive looked every where ..intake manifold and exhaust manifold but I haven't taking turbo apart I will just to see Quote Link to comment https://www.bigmacktrucks.com/topic/61018-2006-mack-ai-427-misfire/page/2/#findComment-443829 Share on other sites More sharing options...
Truecountry Posted February 27, 2020 Author Share Posted February 27, 2020 This is a caterpillar 815 compactor I know not a mack or a truck but ..I found this one 5 years ago and took pics to prove it... Complain of compactor was light tapping in engine but its so loud no muffler hard to hear tap..but I hear miss in engine Cylinder number 4 on head its one piece head btw 1 Quote Link to comment https://www.bigmacktrucks.com/topic/61018-2006-mack-ai-427-misfire/page/2/#findComment-443831 Share on other sites More sharing options...
Truecountry Posted February 27, 2020 Author Share Posted February 27, 2020 Cat engine spit the broken piece into number 6 Quote Link to comment https://www.bigmacktrucks.com/topic/61018-2006-mack-ai-427-misfire/page/2/#findComment-443832 Share on other sites More sharing options...
Mack Technician Posted February 27, 2020 Share Posted February 27, 2020 Nasty... 1 Quote Link to comment https://www.bigmacktrucks.com/topic/61018-2006-mack-ai-427-misfire/page/2/#findComment-443833 Share on other sites More sharing options...
Truecountry Posted February 27, 2020 Author Share Posted February 27, 2020 if its not in snail of turbo could it make it into aftercooler ? Quote Link to comment https://www.bigmacktrucks.com/topic/61018-2006-mack-ai-427-misfire/page/2/#findComment-443834 Share on other sites More sharing options...
fjh Posted February 27, 2020 Share Posted February 27, 2020 because of the air flow I highly doubt it when that direction! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/61018-2006-mack-ai-427-misfire/page/2/#findComment-443873 Share on other sites More sharing options...
Mack Technician Posted February 27, 2020 Share Posted February 27, 2020 Via the bend and distortion in remaining valve chunk I’d guess that thing was turning into red licorice when the rim came undone. Still believe it left a chunk of its carcass some where. Quote Link to comment https://www.bigmacktrucks.com/topic/61018-2006-mack-ai-427-misfire/page/2/#findComment-443882 Share on other sites More sharing options...
Truecountry Posted March 20, 2020 Author Share Posted March 20, 2020 ok re did valve adjustment ...loosen push rod spring adjuster rocker arm did the .010 on end of Yoke and spring under rocker on same yoke and checked with pressure on end on rocker for drag did the .045 under spring under rocker for push rod adjustment now I don't have 6inch pound screw driver so I snugged it down till closed and loosed a lil bit did .045 still under and .024 under end of rocker to yoke pulled .045 out and checked .024 again its a lil tight but snug ...this seem right the manual is hard to read tiny writing lol old eyes Quote Link to comment https://www.bigmacktrucks.com/topic/61018-2006-mack-ai-427-misfire/page/2/#findComment-446065 Share on other sites More sharing options...
Mack Technician Posted March 20, 2020 Share Posted March 20, 2020 4 hours ago, Truecountry said: ok re did valve adjustment ...loosen push rod spring adjuster rocker arm did the .010 on end of Yoke and spring under rocker on same yoke and checked with pressure on end on rocker for drag did the .045 under spring under rocker for push rod adjustment now I don't have 6inch pound screw driver so I snugged it down till closed and loosed a lil bit did .045 still under and .024 under end of rocker to yoke pulled .045 out and checked .024 again its a lil tight but snug ...this seem right the manual is hard to read tiny writing lol old eyes I usually leave my wrench on the rocker arm adjuster and put just enough weighted down pressure on it to compress the push tube spring. You get a more true drag “response” back from the feeler gauge with the tube compressed. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/61018-2006-mack-ai-427-misfire/page/2/#findComment-446107 Share on other sites More sharing options...
fjh Posted March 20, 2020 Share Posted March 20, 2020 If the history is unknown on this engine You should change out your rocker bolts if you haven't already! DON'T TRUST THEM! Its and un written rule at our place to replace these if we don't have history of replacement ! had a few bad experiences! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/61018-2006-mack-ai-427-misfire/page/2/#findComment-446125 Share on other sites More sharing options...
Truecountry Posted March 28, 2020 Author Share Posted March 28, 2020 Mack is up and running …………….THANKS GUYS 1 Quote Link to comment https://www.bigmacktrucks.com/topic/61018-2006-mack-ai-427-misfire/page/2/#findComment-446979 Share on other sites More sharing options...
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