Rebuilt 360 cranks and then stops
#2627805
03/02/19 05:05 AM
03/02/19 05:05 AM
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Joined: Jan 2010
Posts: 1,944 woodcrest, CA
magnum440d100
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OP
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Rebuilt a 79 360. Stock crank, scat rods, speed pro pistons.
Already fired up and ran for 10 minutes. Ran great. Turned her off normally, went inside and ate dinner, went out to start her back up, she started, I pushed the clutch in, she died, and now she will crank a partial turn. I can get underneath and turn it in reverse by the flywheel, and when I turn the key to crank her, she will turn a revolution, and then stop.
I pulled plugs thinking maybe a hydrolock situation, but the spark plugs are bone dry.
Swapped starters thinking maybe a bad starter, but same situation.
Before I tear my hair out, what could possibly be my issue?
Been a long week, so not gonna mess with it until morning...
Edit: oil pressure was 50psi confirmed with a mechanical gauge.
Last edited by magnum440d100; 03/02/19 05:26 AM.
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Re: Rebuilt 360 cranks and then stops
[Re: fastmark]
#2627837
03/02/19 11:18 AM
03/02/19 11:18 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Turn it by hand forward and see what happens. Agreed, pull the plugs back out & grab your 1&1/4" socket/breaker bar. Post what happens. EDIT After rereading I hope it is something external with the clutch (my guess) as opposed to something internal maybe with the thrust bearing (just thinking out loud).
Last edited by RapidRobert; 03/02/19 11:27 AM. Reason: more thought/bored
live every 24 hour block of time like it's your last day on earth
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Re: Rebuilt 360 cranks and then stops
[Re: RapidRobert]
#2627863
03/02/19 12:42 PM
03/02/19 12:42 PM
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Joined: Jan 2010
Posts: 1,944 woodcrest, CA
magnum440d100
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Turn it by hand forward and see what happens. Agreed, pull the plugs back out & grab your 1&1/4" socket/breaker bar. Post what happens. EDIT After rereading I hope it is something external with the clutch (my guess) as opposed to something internal maybe with the thrust bearing (just thinking out loud). Turning it forward by hand/1-1/4” produces the same result. If I turn it back, and then forward, the motor eventually gets “tight” and doesn’t turn anymore. The block was line honed, and when I assembled it, I rotated the crank every time I installed a piston. No binding at all.
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Re: Rebuilt 360 cranks and then stops
[Re: GODSCOUNTRY340]
#2627904
03/02/19 02:08 PM
03/02/19 02:08 PM
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Joined: Jan 2010
Posts: 1,944 woodcrest, CA
magnum440d100
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Check your torque convertor bolts, sounds like one has loosened and backed out. Checked flywheel bolts as I rotated the crank backwards by hand. Looking at the back of the crank flange. I can see all the bolts and that they are all the same depth. Clutch to flywheel bolts are the same. They are all tight.
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Re: Rebuilt 360 cranks and then stops
[Re: Ramman]
#2627906
03/02/19 02:10 PM
03/02/19 02:10 PM
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Joined: Jan 2010
Posts: 1,944 woodcrest, CA
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Did you try turning it with the plugs removed as suggested? My thought was a leaking head gasket that didn't seal and you have a cyl. full of water. I did remove the spark plugs and they are dry, though I did not try cranking it with them removed. I was thinking that since the plugs are dry, no water present, and no hydrolock... I will pull them again and see if it spins over freely.
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Re: Rebuilt 360 cranks and then stops
[Re: magnum440d100]
#2627915
03/02/19 02:27 PM
03/02/19 02:27 PM
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Joined: Feb 2005
Posts: 529 SW CO
HemiSportFury
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mopar
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SW CO
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Does it get tight, or stop? Does it always stop at the same spot (put mark on damper). May be valve stuck open hitting piston. Might pull valve covers to check.
'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
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Re: Rebuilt 360 cranks and then stops
[Re: magnum440d100]
#2628038
03/02/19 08:16 PM
03/02/19 08:16 PM
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Joined: Feb 2005
Posts: 529 SW CO
HemiSportFury
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mopar
Joined: Feb 2005
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SW CO
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Take a rubber mallet and give a good whack to each valve on the cylinder to see if they are free. That head is probably going to have to come off. Hopefully the piston and cylinder wall isn't damaged.
'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
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Re: Rebuilt 360 cranks and then stops
[Re: magnum440d100]
#2628043
03/02/19 08:27 PM
03/02/19 08:27 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Circle Track
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Lincoln Nebraska
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P/V collision I am thinking (sumpin dont quite add up tho). I would pull the rockers/pushrods & see if it is (now) free.
live every 24 hour block of time like it's your last day on earth
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Re: Rebuilt 360 cranks and then stops
[Re: HemiSportFury]
#2628045
03/02/19 08:29 PM
03/02/19 08:29 PM
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Joined: Jan 2010
Posts: 1,944 woodcrest, CA
magnum440d100
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OP
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Take a rubber mallet and give a good whack to each valve on the cylinder to see if they are free. That head is probably going to have to come off. Hopefully the piston and cylinder wall isn't damaged. Whacked them all and they all are free. Borescope down the cylinder shows no damage... Ordered new pushrods and have spare rockers from another motor. Rotated the motor by hand and the rest of the rockers and distributor cap turn, so it’s srill all connected. I have a cloyes true double roller on there....
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Re: Rebuilt 360 cranks and then stops
[Re: RapidRobert]
#2628053
03/02/19 08:43 PM
03/02/19 08:43 PM
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Joined: Jan 2010
Posts: 1,944 woodcrest, CA
magnum440d100
OP
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OP
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Joined: Jan 2010
Posts: 1,944
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P/V collision I am thinking (sumpin dont quite add up tho). I would pull the rockers/pushrods & see if it is (now) free. Motor still hits when turn backwards....
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Re: Rebuilt 360 cranks and then stops
[Re: magnum440d100]
#2628056
03/02/19 08:50 PM
03/02/19 08:50 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Circle Track
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Posts: 36,041
Lincoln Nebraska
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^^^ & that is whith all the pushrods out?
live every 24 hour block of time like it's your last day on earth
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