Slight block damage. Should I be worried?
02-10-2018, 02:43 PM
#1
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Slight block damage. Should I be worried? Long story short, lifter failed, wiped out cam lobe, replaced lifter and cam, car ran good for roughly 3k miles. After 4 high speed back to back runs spun a bearing (guessing due to metal left in motor) I’m rebuilding the motor and noticed this. I’m not worried about this but I would like some opinions.
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02-11-2018, 09:51 PM
#3
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Yeah they do, especially the one on the left! I suppose it could be cleaned up, throw in some lifters and roll with it but you'd be taking a chance. Is it something your prepared to do again should it fail? If it was me I would certainly have it checked out.
02-12-2018, 07:30 AM
#6
TECH Fanatic
Looks like a crack in the top picture. At a minimum, you should be trying to blend that damage out... only after that would you know if it's salvageable.
Another idea is to weld it, then have the machine shop re-bore the journal. If you leave that crack there, it's not going to get better with running it. I'd talk to the machine shop and see what they can or cannot do.
Another idea is to weld it, then have the machine shop re-bore the journal. If you leave that crack there, it's not going to get better with running it. I'd talk to the machine shop and see what they can or cannot do.
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02-12-2018, 12:12 PM
#9
TECH Fanatic
It could be from the casting, but it's something I'd be doing some NDI on with either eddy current or dye penetratrant. Just to be sure.
02-12-2018, 12:19 PM
#10
TECH Fanatic
Another nickname I had was "the dark cloud." Lol. Every time that production control would see me, I had some bad news lol.
I hope in this case that it's just a casting mark, I'm not always right, but I make damn sure that I am wrong before proceeding with reassembling. Just considering what happened to that lifter and cam, it's not beyond reason that it could have cracked like that.
I hope in this case that it's just a casting mark, I'm not always right, but I make damn sure that I am wrong before proceeding with reassembling. Just considering what happened to that lifter and cam, it's not beyond reason that it could have cracked like that.
02-12-2018, 12:46 PM
#11
I have done about a million inspections on various helicopters, and seeing a faded jagged line running between the journals like that bottom pic gets my attention.It could be from the casting, but it's something I'd be doing some NDI on with either eddy current or dye penetratrant. Just to be sure.
02-12-2018, 02:09 PM
#12
TECH Fanatic
It's tough to tell in a picture... just appears as a crack at first glance. Considering the other damage, it's a reasonable assumption. I always error on the side of caution with these things.
One thing is it isn't going to one of the holes or relief points, so that points towards it being a casting line. But tough to tell in a picture either way. I hate trying to diagnose things on the interwebs lol.
One thing is it isn't going to one of the holes or relief points, so that points towards it being a casting line. But tough to tell in a picture either way. I hate trying to diagnose things on the interwebs lol.
02-12-2018, 02:23 PM
#13
It's tough to tell in a picture... just appears as a crack at first glance. Considering the other damage, it's a reasonable assumption. I always error on the side of caution with these things.
One thing is it isn't going to one of the holes or relief points, so that points towards it being a casting line. But tough to tell in a picture either way. I hate trying to diagnose things on the interwebs lol.
One thing is it isn't going to one of the holes or relief points, so that points towards it being a casting line. But tough to tell in a picture either way. I hate trying to diagnose things on the interwebs lol.
I do know there's no way I would run lifters in those bores the way they are, That's asking for failure.
02-12-2018, 02:28 PM
#14
TECH Fanatic
It's been a while since I've had an engine apart, so I'm sure you're right. I agree... no way I'd run that with a jacked up lifter journal like that either.
02-13-2018, 01:23 AM
#17
BHJ makes a fixture to drill/ream lifter bores and install bushings.
Most of the machine shop cost to do lifter bushings is going to be the setup of the fixture and machine. Might as well put bushings in all the holes and correct any factory machining errors while you're there.
If the cost to do so isn't worth it (stock block?) then maybe a "new" block, hone and fresh rings would be a better option. It's up to you, but I certainly wouldn't run that block without at least repairing the damaged lifter bores.
If you need bushings, CHE makes the best in my opinion.
Most of the machine shop cost to do lifter bushings is going to be the setup of the fixture and machine. Might as well put bushings in all the holes and correct any factory machining errors while you're there.
If the cost to do so isn't worth it (stock block?) then maybe a "new" block, hone and fresh rings would be a better option. It's up to you, but I certainly wouldn't run that block without at least repairing the damaged lifter bores.
If you need bushings, CHE makes the best in my opinion.