472 Cummins Crate Hemi questions
#999005
05/24/11 01:24 PM
05/24/11 01:24 PM
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Anonymous
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Customer dropped off a 472 Crate Hemi--tag says Cummins last digits are 666 AC--it is several years old been sitting since bought--what are the things if any that need a look on this before install--I know the older units had problems -crate says dyno but looks like a few minutes on a test stand to me--pulled intake and covers--pushrods all have room--cam and lifters look like they have run some and look great! Retainers look wimpy and do not fit the single spring--does it need a different spring and retainer--single seems like borderline on this to me--Thanks for the help!
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Re: 472 Cummins Crate Hemi questions
[Re: ]
#999006
05/24/11 02:46 PM
05/24/11 02:46 PM
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Joined: Mar 2003
Posts: 4,848 Memphis
HemiRick
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Posts: 4,848
Memphis
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My 528 Cummins assembled engine had several problems the biggest being the finish on the cyl walls was too rough and wore the rings square. These engine were not run, just spun to test for oil pressure, etc. Eventually Ray Barton rebuilt my enigine on Chryslers tab, it's been right ever since.
Yes the retainers are slightly smaller than the springs this is not a problem. The factory valve job is also questionable.
The head gaskets were also rubbing several pushrods.
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: 472 Cummins Crate Hemi questions
[Re: ]
#999008
05/24/11 05:36 PM
05/24/11 05:36 PM
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Joined: Jan 2003
Posts: 74,937 U.S.S.A.
JohnRR
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You probably don't want to hear this from me ... but tear it down The engine was run , not sure how long mine had black residue in the exh ports. I have a 426 , the ID of the springs are about .090 bigger than the retainer step , the valve guide clearance is all over the place , I think my heads have bronze liners now. the head gaskets have red RTV around the the big water ports, mine had RTV in at least 2 cylinders they put on so much. The #1 exhaust pushrod rubbed on the head gasket enough to keep the lifter from rotating when I spun it over by hand. When I matched the gasket to a steel shim gasket the exh pushrods holes were not in the exact same spot and they were both felpro gaskets. All the ring gaps were lined up over each other on at least 5 pistons , not sure how much that matters though. I never checked rocker geometry , After seeing the pushrod and spring issue I pulled the heads and found the head gasket issue so I just tore it down to a bare block.
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Re: 472 Cummins Crate Hemi questions
[Re: ]
#999009
05/25/11 12:19 AM
05/25/11 12:19 AM
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Joined: Dec 2007
Posts: 18,157 Mass
DAYCLONA
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I Live Here
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Posts: 18,157
Mass
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On the 472 Cummings built Hemi's I dealt with, 528 head gaskets used on some of the 472's before Cummings caught it, resulting in blown head gaskets, or coolant leaks, really nice after it's in the car..,.according to Ernie at Cummings, approx 50+ 472's went out with a bad batch of Comp Cams castings (China),....got one ,....also the rocker adjuster screws weren't tempered right, too hard and brittle, either end will break off,...2 out of 3 engines had the rear main crank seal installed backwards..... Tear it down, and go thru the whole thing, run the block number thru Cummings, they'll inform you of potential problems, warranty on the Engine is 90 days from purchase,....so that's out the window for your customer's engine Mike
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Re: 472 Cummins Crate Hemi questions
[Re: Lee446]
#999011
05/25/11 06:28 PM
05/25/11 06:28 PM
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Tore it down all the way today--I think we had one of the decent units that would have done fine--Guy at Mopar was very helpful over the phone and took his time to help establish which unit we had--approx date of build etc--had lots of specs on that unit THANKS! BG gave some good input as well as others--this engine was run a very short time--Had Engle cam not Comp Yea!!! It looked good--cylinder wall finish looked good, bearings were fine and overall pretty clean build--cam did have oil groove on the correct journals--retainers were weak at best--did NOT fit the spring which was in at 100 seat and 250 open--will see about that after bottom is back together- no protective shim under springs--those flat wound dampers can bore a hole in a head so that will be addressed-no pushrod rubbing, correct head gaskets, billet seal retainer--no windage tray, overall what I would expect for a factory type crate--some of the bearings showed that the crank was a tad fat near the chamfer etc but they always are--would have run forever just like it is--intake was loose , plugs were loose, the RTV deal on the waterholes looked fine to me --heck I would have used more than they did--have not got to the guides etc yet but have to say it all looked like a decent deal to me. Looks like some gaskets , oil , filter, paint , retainers locks and away we go. Thanks for the input
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Re: 472 Cummins Crate Hemi questions
[Re: CrazyD]
#999013
05/25/11 08:52 PM
05/25/11 08:52 PM
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well Cummins had a # on the yellow tag ofthe engine-- they don't have the business I guess so it forwarded to Mopar directly--nice man--did not get his name was very helpful--seemed to know much about what was made where and was in each one--said Memphis units were not good that Canada built stood a better chance
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Re: 472 Cummins Crate Hemi questions
[Re: ]
#999015
05/26/11 01:42 AM
05/26/11 01:42 AM
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Joined: Jan 2003
Posts: 74,937 U.S.S.A.
JohnRR
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Quote:
the RTV deal on the waterholes looked fine to me --heck I would have used more than they did--
Did it have composite head gaskets or steel shim ?
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Re: 472 Cummins Crate Hemi questions
[Re: JohnRR]
#999016
05/26/11 07:50 PM
05/26/11 07:50 PM
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Re: 472 Cummins Crate Hemi questions
[Re: ]
#999017
05/27/11 09:23 AM
05/27/11 09:23 AM
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Joined: Jan 2003
Posts: 74,937 U.S.S.A.
JohnRR
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Quote:
composite
And you would slather MORE RTV than they did on a COMPOSITE gasket ??
I have never seen RTV on a composite gasket except for this CORE hemi crate motor I got from Cummins I've also never seen it recommended by anyone to use RTV on a composite gasket.
Maybe you and cummins are smarter than the rest of the universe ?
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Re: 472 Cummins Crate Hemi questions
[Re: JohnRR]
#999018
05/27/11 09:50 AM
05/27/11 09:50 AM
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Re: 472 Cummins Crate Hemi questions
[Re: ]
#999019
05/27/11 02:09 PM
05/27/11 02:09 PM
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Joined: Jan 2003
Posts: 74,937 U.S.S.A.
JohnRR
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