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Re: Main bearings
[Re: WBR]
#888523
12/26/10 01:22 PM
12/26/10 01:22 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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Replace em for sure. EDIT what do the journals look like?
Last edited by RapidRobert; 12/26/10 01:38 PM.
live every 24 hour block of time like it's your last day on earth
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Re: Main bearings
[Re: RapidRobert]
#888524
12/26/10 01:40 PM
12/26/10 01:40 PM
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Joined: Jun 2010
Posts: 85
europe
WBR
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The thing that worries me is, the engine has been driven only for like four quartermile runs, with 11.9 sec time, if it matters. The mains still have original bolts. If i replace them with ARP stuff, will it need to be alignhoned with new bolts?
Street driven, 421 Sb, NA, 9.98/137
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Re: Main bearings
[Re: WBR]
#888526
12/26/10 01:58 PM
12/26/10 01:58 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
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Posts: 36,040
Lincoln Nebraska
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Is the eng out on a stand or are you up under it under the car? (I'm assuming under the car). Unlike rod bolts (cause they locate the cap) you can replace main bolts WO align bore or honing if that ends up being our solution). W this happening so soon can you post some clear close up pics of what we're dealing w? EDIT What eng
Last edited by RapidRobert; 12/26/10 02:01 PM.
live every 24 hour block of time like it's your last day on earth
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Re: Main bearings
[Re: WBR]
#888527
12/26/10 02:13 PM
12/26/10 02:13 PM
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Joined: Mar 2003
Posts: 4,848
Memphis
HemiRick
master
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master
Joined: Mar 2003
Posts: 4,848
Memphis
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It's normal for bearings to lose the satin new finish and turn shiny after use.
Take care,
Rick
68 Coronet R/T 440 & 68 Charger 528 Hemi,and 5 Challengers! 6 cyl, 318, 360, 383, 451
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Re: Main bearings
[Re: HemiRick]
#888528
12/26/10 03:01 PM
12/26/10 03:01 PM
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Joined: Jun 2010
Posts: 85
europe
WBR
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The engine is on a stand. Theres 2feet of snow so i got the time. I`m about to do some porting to the heads so i figured i could check things so everything would be ready for summer. I lost bearings last summer,after rebuild, i think because main bolts came loose.(???) I had the crank turned and everything seemed ok. After the runs oil pressure dropped some, from 70 to 45 psi, with 20/50 valvoline racing. so something happened? I
`m gonna tear it down and check the rod bearings also. What else? I`ll try to get some pics for ya tomorrow.
Street driven, 421 Sb, NA, 9.98/137
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Re: Main bearings
[Re: WBR]
#888529
12/28/10 01:21 PM
12/28/10 01:21 PM
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Joined: Jun 2010
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europe
WBR
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Ok. Here`s a pic of the bearings. They are the three middle ones. Now that i looked at them with better time, i think they look ok. I just got paranoid after last summers problems. The engine is a 360 with 12-1 icon forged pistons and scat I-beam rods, a Lunati ft-cam, and w2-heads. But the oil pressure still bothers me.
Last edited by WBR; 12/28/10 01:26 PM.
Street driven, 421 Sb, NA, 9.98/137
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Re: Main bearings
[Re: buildanother]
#888531
12/28/10 01:44 PM
12/28/10 01:44 PM
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Joined: Jun 2010
Posts: 85
europe
WBR
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Thanks. I`m starting to feel the same way. The crank looks good (and feels) so i think i`m good to go.
Street driven, 421 Sb, NA, 9.98/137
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Re: Main bearings
[Re: WBR]
#888532
12/28/10 01:45 PM
12/28/10 01:45 PM
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Joined: Jan 2003
Posts: 74,974
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,974
U.S.S.A.
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Quote:
Ok. Here`s a pic of the bearings. They are the three middle ones. Now that i looked at them with better time, i think they look ok. I just got paranoid after last summers problems. The engine is a 360 with 12-1 icon forged pistons and scat I-beam rods, a Lunati ft-cam, and w2-heads. But the oil pressure still bothers me.
And it should , what is your clearance ?
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Re: Main bearings
[Re: JohnRR]
#888533
12/28/10 02:25 PM
12/28/10 02:25 PM
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Joined: Jun 2010
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Actually, have to admit i didn`t measure after the last trip to crank grinder. Anyway, The oil pressure was good after i put it together (70+ psi) but dropped after the trip to the strip. If all bearings check out, could it be the oil pickup tube which i found at teardown to be a bit loose at the pump end threads, and suck air threw the threads? What do you guys use for sealant at the threads if any? i thought of a tack weld to lock it to the pump but that won`t seal it all the way.
Street driven, 421 Sb, NA, 9.98/137
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Re: Main bearings
[Re: JohnRR]
#888535
12/28/10 03:57 PM
12/28/10 03:57 PM
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Joined: Jun 2010
Posts: 85
europe
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Actually those marks on bearings are the original satin finish. The picture doesn`t show it very good. The pick up tube was tight when installed and i was afraid to turn it a whole turn more to get it positioned correctly. I was a bit surprised it was loose, but live and learn. Will plastigage give me a accurate enough measure of the clearances? I`ve heard some like it and others don`t. I used it the first time and should have some left in the shop.
Street driven, 421 Sb, NA, 9.98/137
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Re: Main bearings
[Re: WBR]
#888536
12/28/10 07:08 PM
12/28/10 07:08 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Lincoln Nebraska
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I am going out on a limb & say that the clearance was way too tight (& maybe the psi dropped when they wiped shiney & clearance increased it). Since the crank looks good I'd get some .001" under bearings or some same size bearings w increased clearance.  . No way should they be wiped that shiney in that (brief) amt of use. Sumpin ain't kosher. NPT threads need sealant & w yours being a bit loose use the thickest sealer you can find. Permatex #2 in the toothpaste like tube is good.
live every 24 hour block of time like it's your last day on earth
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Re: Main bearings
[Re: RapidRobert]
#888537
12/29/10 12:50 PM
12/29/10 12:50 PM
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Joined: Jun 2010
Posts: 85
europe
WBR
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Thanks. I`ll do the measuring. I think its the only way to get piece of mind. IŽll be back when i get some numbers so we can see if you hit it correctly. Is there a way to check the oilpump itself before installation?
Street driven, 421 Sb, NA, 9.98/137
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Re: Main bearings
[Re: Dave Watt]
#888539
12/29/10 02:49 PM
12/29/10 02:49 PM
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Joined: Jun 2010
Posts: 85
europe
WBR
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No, I have the filter straight. I,ve been using fram filters(ph 43), but been hearing they wouldn`t be that good. Would there be any benefits of using the 90` and being able to use longer filter?
Street driven, 421 Sb, NA, 9.98/137
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Re: Main bearings
[Re: WBR]
#888540
12/29/10 04:13 PM
12/29/10 04:13 PM
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Joined: Jan 2003
Posts: 74,974
U.S.S.A.
JohnRR
I Win
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I Win
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U.S.S.A.
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Quote:
No, I have the filter straight. I,ve been using fram filters(ph 43), but been hearing they wouldn`t be that good. Would there be any benefits of using the 90` and being able to use longer filter?
I'm not sure how hard it is for you to get filters where you are but I would ditch that POS fram filter.
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Re: Main bearings
[Re: JohnRR]
#888541
12/29/10 04:16 PM
12/29/10 04:16 PM
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Joined: Jan 2003
Posts: 15,548
Norwich CT USA
moparts
I Live Here
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I Live Here
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Posts: 15,548
Norwich CT USA
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Looking at that bearing wear, From that picture it looks very normal to me. Quote:
After the runs oil pressure dropped some, from 70 to 45 psi, with 20/50 valvoline racing. so something happened?
Was this cold engine to hot engine?
What was the idle pressure when hot?
Does it go up when you rev it up?
Last edited by moparts; 12/29/10 04:19 PM.
Tom ,
2011 Ram 3500 C&C Diesel
2009 Challenger R/T
1971 Challenger Conv. 511/4 speed
1970 Challenger R/T 503/727
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If the crank passes the fingernail test, just clean it all out, and if you want, throw a hundred dollars in replacement main bearings at it. 
