Re: Rod Big End clearance problem??????
[Re: DemonDust]
#440119
08/16/09 06:47 PM
08/16/09 06:47 PM
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Joined: Jun 2006
Posts: 916 MB,CAN
PC-CHARGER
super stock
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super stock
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MB,CAN
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Your picture is pretty tough to see but it looks like there is very little that needs to be removed. The proper tool is a bearing scraper like this: http://www.etoolcart.com/bearingscraper.aspxBut if you go slow and easy, a good sharp knife and some patience will work.
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Re: Rod Big End clearance problem??????
[Re: DemonDust]
#440120
08/16/09 06:47 PM
08/16/09 06:47 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Master
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Romeo MI
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Quote:
What is the best way to narrow the bearings?
I've cut them with a knife to increase the chamfer
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Re: Rod Big End clearance problem??????
[Re: DemonDust]
#440123
08/16/09 07:08 PM
08/16/09 07:08 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Master
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Romeo MI
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Quote:
Would a utility knife with a new blade do the trick?
Yes... just light pressure.... your just scrapping it, it scraps easy
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Re: Rod Big End clearance problem??????
[Re: MR_P_BODY]
#440124
08/16/09 07:28 PM
08/16/09 07:28 PM
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Joined: Feb 2003
Posts: 885 south louisiana
lowell66dart
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super stock
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south louisiana
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Maybe practice with an old bearing first.
2021 Dodge 2500 4WD Cummins 2020 Challenger R/T Scat Widebody 2007 Charger R/T 5.7
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Re: Rod Big End clearance problem??????
[Re: dodgefarmer]
#440127
08/16/09 08:18 PM
08/16/09 08:18 PM
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Anonymous
Unregistered
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Anonymous
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Quote:
Check to see if your bearings are marked upper and lower.
Randy
same thing i was thinking. might have one or both in the wrong place.
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Re: Rod Big End clearance problem??????
#440128
08/16/09 09:02 PM
08/16/09 09:02 PM
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Joined: Apr 2007
Posts: 871 WA 98043
thecarfarmer
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You might want to throw a mic on the crank to make sure there's no taper on the journals. I had one that 'greew' .0015 (yes, one and a helf thousandths) from the oil hole to where the radius started.
Just something to look out for.
-Bill
Seduce the attractive, and charm the rest.
******
489 C.I.D., roller cam, aftermarket heads, tunnel ram, stock '54 Dodge rear axle assembly: which of these doesn't belong?
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Re: Rod Big End clearance problem??????
[Re: DemonDust]
#440130
08/16/09 09:41 PM
08/16/09 09:41 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Master
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Quote:
Yeah I checked for upper and lower one of the first things I thought of. I shaved the edge off the bearing and gained tons of clearance by taking a very tiny bit off. Thanks guys for the tips. I've never had this happen before, then again I've never built an engine like this before...
Thanks for all your input..
Does the rod touch the crank now (side)
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Re: Rod Big End clearance problem??????
[Re: DemonDust]
#440132
08/17/09 12:10 AM
08/17/09 12:10 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Quote:
If I push them over and hold them I still have about .013 clearance. Keep in mind before I couldn't even move them a .001. They seem to want to go back to the middle when I rotate the engine. The journals are square. Do I need to take more off the bearing?
Yep
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Re: Rod Big End clearance problem??????
[Re: DemonDust]
#440134
08/17/09 12:26 AM
08/17/09 12:26 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Quote:
Ok, I'll get to it first thing in the morning. I'll let you know how it goes. Do they keep going back to center because there isn't enough chamfer on the bearing?
Hard to say but you shouldnt have to push on them, should slide to the wall of the crank
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Re: Rod Big End clearance problem??????
[Re: MR_P_BODY]
#440135
08/17/09 10:36 AM
08/17/09 10:36 AM
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Joined: Feb 2005
Posts: 5,207 Menomonee Falls
DemonDust
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I made a call down to South Carolina this morning and had sent a few emails to the nascar engine shops I'm in contact with. They told me the same thing to chamfer the bearings. When I told one of them I was scraping the bearing he laughed and said are you crazy???? Use a dremel with a small metal bit. You'll be scraping forever to get enough clearance. Another said they use their lathes to turn them down. Not sure how that works. But anyway I got my air dremel tool out and put my small metal bit in I use for porting and lightly went over the bearing edge. It does a much smoother job than scraping and it turned out very well. Almost looks machined. Thanks Mr. P for all the tech help, it's greatly appreciated Now when I rotate the assembly all the rods go to the radius instead of the center of the crank. I have .040+ clearance between the rods now.
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