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Re: Rebuilt 360 cranks and then stops [Re: magnum440d100] #2628064
03/02/19 09:26 PM
03/02/19 09:26 PM
Joined: Jan 2003
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las vegas
70AARcuda Offline
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las vegas
Stock rocker arms will be punched thru by the pushrod went a stiffer valve spring is used...

MP made or makes a heavy duty non adjustable rocker arm to correct that problem. Still for sale at Mancini Racing..


Tony

70 AARCuda Vitamin C
71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield)
71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas)
71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)
Re: Rebuilt 360 cranks and then stops [Re: magnum440d100] #2628073
03/02/19 09:46 PM
03/02/19 09:46 PM
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The Netherlands
BigBlockMopar Offline
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A dropped bolt or nut in the intake which finally made its way into a cylinder and now jams between a piston and head?
Or a piece of ringland has broken off and is jammed?

I would check all cylinders with the borescope, but the fact that one cylinder has both rockers broken through tells me there's something wrong there.

Re: Rebuilt 360 cranks and then stops [Re: magnum440d100] #2628087
03/02/19 11:04 PM
03/02/19 11:04 PM
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woodcrest, CA
magnum440d100 Offline OP
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The saga continues...


Pulled the rocker off to replace pushrods, and......

31EC87C8-A7DE-4A6E-8171-606F9D824E5C.jpeg
Re: Rebuilt 360 cranks and then stops [Re: magnum440d100] #2628090
03/02/19 11:05 PM
03/02/19 11:05 PM
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woodcrest, CA
magnum440d100 Offline OP
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Looking down the guide, the valve is laying on the piston...

Dunno if it dropped now, or dropped earlier....

Heads coming off after the rains.....

74C82C5B-93CE-45FE-819D-8A0907AFFB2B.jpeg
Re: Rebuilt 360 cranks and then stops [Re: magnum440d100] #2628093
03/02/19 11:26 PM
03/02/19 11:26 PM
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Nebraska
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4406bbl Offline
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Thinking this is easy...you cant use valve rotaters with that big of a cam. I would say valve spring coil bind.

Re: Rebuilt 360 cranks and then stops [Re: magnum440d100] #2628097
03/02/19 11:32 PM
03/02/19 11:32 PM
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Nebraska
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4406bbl Offline
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And in my opinion your cam, lifters, pushrods, rockers. valves, and keepers are all junk now. You will also need new springs and retainers that are for whatever cam you use. Did you tell whoever did the valve job what cam you had. No excuse for this if you did...

Last edited by 4406bbl; 03/02/19 11:35 PM.
Re: Rebuilt 360 cranks and then stops [Re: 4406bbl] #2628106
03/02/19 11:47 PM
03/02/19 11:47 PM
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woodcrest, CA
magnum440d100 Offline OP
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magnum440d100  Offline OP
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Originally Posted By 4406bbl
And in my opinion your cam, lifters, pushrods, rockers. valves, and keepers are all junk now. You will also need new springs and retainers that are for whatever cam you use. Did you tell whoever did the valve job what cam you had. No excuse for this if you did...


Yes. Everything was supposed to have been spec’d out for this cam.

What springs/retainers/pushrods/valves/etc should I go with?

Re: Rebuilt 360 cranks and then stops [Re: magnum440d100] #2628114
03/03/19 12:03 AM
03/03/19 12:03 AM
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Nebraska
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4406bbl Offline
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Stock stuff will work ok for valves, keepers, and retainers, just no thick rotating retainers. Springs should be what cam company recommends, or something similar. You also need to check retainer to guide clearance. Whoever did the heads is at fault no question, but doubt they admit it as you are the final quality control person.

Re: Rebuilt 360 cranks and then stops [Re: magnum440d100] #2628130
03/03/19 12:44 AM
03/03/19 12:44 AM
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Nebraska
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4406bbl Offline
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What part number valve springs are those?

Re: Rebuilt 360 cranks and then stops [Re: 4406bbl] #2628136
03/03/19 01:01 AM
03/03/19 01:01 AM
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God's Country Maryland
GODSCOUNTRY340 Offline
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You were getting coil bind on both intake and exhaust valve springs, proof is both rocker arms failed. You'll most likely find a bunch of bent pushrods.


I love the smell of Deer guts in the morning, it smells like... VICTORY!
Re: Rebuilt 360 cranks and then stops [Re: magnum440d100] #2628139
03/03/19 01:05 AM
03/03/19 01:05 AM
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MI, usa
dvw Offline
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I've seen the stock rockers due that many times. Put a new pair on and go as long as the pushrods are straight. Now why doesn't the motor turn? related ? Maybe?
Doug

Re: Rebuilt 360 cranks and then stops [Re: magnum440d100] #2628157
03/03/19 02:33 AM
03/03/19 02:33 AM
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Nebraska
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4406bbl Offline
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Do not run or rotate this engine anymore until you pull heads and correct retainer to guide clearance about .060, check for coilbind, and check piston to valve clearance. It is not normal for pushrods to go thru stock rockers with that cam. I have done it, and gone thousands of miles no problems with that cam and correct springs.

Last edited by 4406bbl; 03/03/19 02:34 AM.
Re: Rebuilt 360 cranks and then stops [Re: magnum440d100] #2628165
03/03/19 03:12 AM
03/03/19 03:12 AM
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Grand Prairie,Texas
stumpy Offline
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Be sure to check the piston height in the hole with the dropped valve. You may have bent the rod.

Re: Rebuilt 360 cranks and then stops [Re: magnum440d100] #2628797
03/04/19 06:17 PM
03/04/19 06:17 PM
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woodcrest, CA
magnum440d100 Offline OP
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Run it or replace it?

09D5C1DC-7BE5-4EE5-9DDD-4FAE09211DE7.jpeg
Re: Rebuilt 360 cranks and then stops [Re: magnum440d100] #2628801
03/04/19 06:24 PM
03/04/19 06:24 PM
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SW CO
HemiSportFury Offline
mopar
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I'd replace it. Be sure to check the rod too. But most importantly, why did this happen in the first place?

How does the cylinder wall look?

Last edited by HemiSportFury; 03/04/19 06:24 PM.

'64 Sport Fury, 528 Hemi, FiTech EFI, 4-speed, 4.10 Dana 60
'57 Belvedere 2dr sedan, current project in process
'19 Cherokee Trail Hawk Elite
'03 Ram 2500 CTD HO, 6-speed 214,000 miles and still going strong
Re: Rebuilt 360 cranks and then stops [Re: magnum440d100] #2628804
03/04/19 06:32 PM
03/04/19 06:32 PM
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dogdays Offline
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Replace it. Part number for a single is WH116CP 30. Less than $50 on Rockauto, $75 from NAPA.

It's the W in front of the H that makes it a single piston although Rockauto seems to be breaking up sets and selling individually.

It's a hypereutectic piston although there's a difference between a Keith Black and a Sealed Power hypereutectic. The Sealed Power alloy is closer to the eutectic point and thus more ductile. Yet I don't like that gnarly black spot that looks like it goes quite a way in.

R.

Re: Rebuilt 360 cranks and then stops [Re: magnum440d100] #2628811
03/04/19 06:45 PM
03/04/19 06:45 PM
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woodcrest, CA
magnum440d100 Offline OP
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Yeah, I was afraid replacing it was going to have to be done.

Got this one from Bob mazzolinni years ago.

As far as why it happened, I think everyone is right about coil bind. When the heads were put together, everything measured out tight but fine.

The piston sits in the hole same as the others, so no bent rod. Gonna replace the bearing just to be sure as well...

Off to the parts store....

EEF3204C-FA40-4535-ADBD-D3FDEC322045.jpeg
Re: Rebuilt 360 cranks and then stops [Re: magnum440d100] #2628945
03/05/19 12:54 AM
03/05/19 12:54 AM
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SW CO
HemiSportFury Offline
mopar
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SW CO
So are you thinking the coil bind is your only problem? It looks like the valve was tagging the piston too. Did you check P-V clearance and degree the cam? What does the head look like? Any sign to piston-valve contact on any other cylinder. You don't want to go through this again. It could have been much worse.


'64 Sport Fury, 528 Hemi, FiTech EFI, 4-speed, 4.10 Dana 60
'57 Belvedere 2dr sedan, current project in process
'19 Cherokee Trail Hawk Elite
'03 Ram 2500 CTD HO, 6-speed 214,000 miles and still going strong
Re: Rebuilt 360 cranks and then stops [Re: HemiSportFury] #2628949
03/05/19 01:02 AM
03/05/19 01:02 AM
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Lincoln Nebraska
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RapidRobert Offline
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^^^ agreed, I would mockup with a pair of light springs & go thru all of the clearance checks


live every 24 hour block of time like it's your last day on earth
Re: Rebuilt 360 cranks and then stops [Re: magnum440d100] #2629017
03/05/19 04:05 AM
03/05/19 04:05 AM
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Nebraska
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4406bbl Offline
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Changing piston and bearing is smart.

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