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+--- Thread: ISX CM871 New Head Or Rebuild Old Head (/showthread.php?tid=308)
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RE: ISX CM871 New Head Or Rebuild Old Head - Unilevers - 04-20-2016
ive never had much luck with the aftermarket rebuilt heads - i find the cups start leaking right away and things go bad from there. I am starting to see some OEM remans that are failing very quickly now due to issues. Two have cracked back by one of the exhaust valve guides on #6 and one was 8 thou warped right outa the box. the ones with the cracked spot were cracked into the # 6 exhaust runner and would dump raw oil like crazy into he exhaust.
These are all recent Cummins remans, before this i hadnt had a issue with them. im only paying 400 bucks more for a brand new head and i havent had a bad one of those yet, but time will tell.
RE: ISX CM871 New Head Or Rebuild Old Head - Rawze - 04-21-2016
(04-20-2016 )Unilevers Wrote: ive never had much luck with the aftermarket rebuilt heads - i find the cups start leaking right away and things go bad from there. I am starting to see some OEM remans that are failing very quickly now due to issues. Two have cracked back by one of the exhaust valve guides on #6 and one was 8 thou warped right outa the box. the ones with the cracked spot were cracked into the # 6 exhaust runner and would dump raw oil like crazy into he exhaust.
These are all recent Cummins remans, before this i hadnt had a issue with them. im only paying 400 bucks more for a brand new head and i havent had a bad one of those yet, but time will tell.
I am thinking that a LOT of reman heads are likely from cores with bad deletes? -- Who knows what catastrophic stresses a lot of those cores suffered before they were remanned!. You would think that a magnaflux, etc. would catch those cracks in the thing,.. but that is not always 100%.
RE: ISX CM871 New Head Or Rebuild Old Head - Waterloo - 04-21-2016
(04-21-2016 )Rawze Wrote:(04-20-2016 )Unilevers Wrote: ive never had much luck with the aftermarket rebuilt heads - i find the cups start leaking right away and things go bad from there. I am starting to see some OEM remans that are failing very quickly now due to issues. Two have cracked back by one of the exhaust valve guides on #6 and one was 8 thou warped right outa the box. the ones with the cracked spot were cracked into the # 6 exhaust runner and would dump raw oil like crazy into he exhaust.
These are all recent Cummins remans, before this i hadnt had a issue with them. im only paying 400 bucks more for a brand new head and i havent had a bad one of those yet, but time will tell.
I am thinking that a LOT of reman heads are likely from cores with bad deletes? -- Who knows what catastrophic stresses a lot of those cores suffered before they were remanned!. You would think that a magnaflux, etc. would catch those cracks in the thing,.. but that is not always 100%.
Seems like more than a few shops are doing those bad deletes, I have one where I buy parts from doing them... He has a machine shop to reman these heads... And he does. I ran when I figured out what he was up to when I interviewed them for my in frame.