is this iron usable?
05-16-15, 10:20 AM
#1
is this iron usable?
I took a motor apart that ran well but blew a coolant seal. From my observations it has been rebuilt before. The rear iron has some scraping which looks to be from a blown seal obviously someone else deemed it to be good to use and the engine ran fine but how many ponies will I be losing if I proceed to use this iron.
I traced over the grooves on my template to show what part of the rotor it affects. It looks like one of the grooves is right on the edge of the rotor and the other is right on the edge of the housing. The only part that the grooves touch is the edge of the apex seal.
I traced over the grooves on my template to show what part of the rotor it affects. It looks like one of the grooves is right on the edge of the rotor and the other is right on the edge of the housing. The only part that the grooves touch is the edge of the apex seal.
05-16-15, 04:14 PM
#2
F'n Newbie...
iTrader: (6)
Are you talking about the step wear? If so, all engines get that with time. A little bit is "ok" too much is not (the FSM outlines how much is acceptable) though.
If you're overly concerned you can always send your irons in to be lapped and renitrated. I've had to do that myself (spun a rotor bearing and the rotor tips brushed the iron) and it's not too expensive. Came back looking almost as good as they did when I picked up the motor, new, from Mazda several years ago.
If you're overly concerned you can always send your irons in to be lapped and renitrated. I've had to do that myself (spun a rotor bearing and the rotor tips brushed the iron) and it's not too expensive. Came back looking almost as good as they did when I picked up the motor, new, from Mazda several years ago.
05-17-15, 09:22 AM
#4
RX-7 Bad Ass
iTrader: (55)
My rule of thumb is if your thumbnail catches in it, it's too deep.
Dale
Dale
05-17-15, 09:58 AM
#5
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Mazdas spec is 0.0039" if its deeper than that its junk
05-19-15, 10:52 AM
#7
Are you talking about the step wear? If so, all engines get that with time. A little bit is "ok" too much is not (the FSM outlines how much is acceptable) though.
If you're overly concerned you can always send your irons in to be lapped and renitrated. I've had to do that myself (spun a rotor bearing and the rotor tips brushed the iron) and it's not too expensive. Came back looking almost as good as they did when I picked up the motor, new, from Mazda several years ago.
If you're overly concerned you can always send your irons in to be lapped and renitrated. I've had to do that myself (spun a rotor bearing and the rotor tips brushed the iron) and it's not too expensive. Came back looking almost as good as they did when I picked up the motor, new, from Mazda several years ago.
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05-21-15, 05:31 PM
#9
F'n Newbie...
iTrader: (6)
Plate Lapping and Re-Nitriding - chipsmotorsports
A full motor is $580 (plus shipping), but if you call Chip and speak with him he'll likely work with you if you don't need all irons done. My job was cheaper since I only needed the two surfaces (front iron, and front side of center iron) lapped and nitrated.
A word of warning though!!! DO NOT just have irons lapped. If you have them milled flat than you REALLY want/need to have them re-nitrated (hardened) or else they will wear very quickly!! IIRC Mazda hardens the iron faces from the factory, when you lap/mill them down you remove that hardened surface. So you def want to do the job correctly/completely and put the iron through a rehardening process before you use it.
A full motor is $580 (plus shipping), but if you call Chip and speak with him he'll likely work with you if you don't need all irons done. My job was cheaper since I only needed the two surfaces (front iron, and front side of center iron) lapped and nitrated.
A word of warning though!!! DO NOT just have irons lapped. If you have them milled flat than you REALLY want/need to have them re-nitrated (hardened) or else they will wear very quickly!! IIRC Mazda hardens the iron faces from the factory, when you lap/mill them down you remove that hardened surface. So you def want to do the job correctly/completely and put the iron through a rehardening process before you use it.
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