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engine siezed, any thoughts on why #2160821
09/24/16 01:17 PM
09/24/16 01:17 PM
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Lincoln Nebraska
RapidRobert Offline OP
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helped a man with a 340 breakin. fired right up & I held it to 2200-2500. oil psi was 80. water temp climbed to 160 fairly fast. no leaks & sounding good & all of a sudden after about 3-4 minutes it suddenly started to slow down somewhat noticeably & I was manning the throttle & I thought I had with my hand just relaxed/backed off a bit so I moved the throttle up a bit but it stayed the same then 2 seconds later I heard a barely noticeable possibly but not sure metallic "hit" then it died 1 second later. we put a socket on the crank & it is locked solid. No info on clearances. thank you for your time.


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Re: engine siezed, any thoughts on why [Re: RapidRobert] #2160831
09/24/16 01:41 PM
09/24/16 01:41 PM
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Spencer NY
killermopar Offline
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Possibly a rod bearing piggy backed.

Re: engine siezed, any thoughts on why [Re: killermopar] #2160843
09/24/16 01:52 PM
09/24/16 01:52 PM
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Blair County,PA
62maxwgn Offline
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Something I could never comprehend,if you have a crank that is the correct diameter and a rod that has the correct bore and correct bearings with proper clearance,how could one possibly end up on top of the other ?

But,I guess it was thrown together anything is possible ! shruggy

Re: engine siezed, any thoughts on why [Re: RapidRobert] #2160845
09/24/16 01:55 PM
09/24/16 01:55 PM
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Spencer NY
killermopar Offline
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I don't know, but somehow they do. It defies the laws of physics

Re: engine siezed, any thoughts on why [Re: killermopar] #2160858
09/24/16 02:24 PM
09/24/16 02:24 PM
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Lincoln Nebraska
RapidRobert Offline OP
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he's a busy guy but he will get back to me when he opens it up. I was not involved in the build but his OCD matches mine (& then some!). he said the shop assured him that P/V collision was not possible with his dimentions (lift/piston amt in the hole). he said the ring gapping was the norm & bearings iirc between 2-3 tho plastigauged. all the final prep we did was standard procedure AFAIK but I feel bad like maybe I missed something. well I guess it is somewhat conjecture for now but I will post how it turns out


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Re: engine siezed, any thoughts on why [Re: RapidRobert] #2160879
09/24/16 02:49 PM
09/24/16 02:49 PM
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Bend,OR USA
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Cab_Burge Offline
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Sounds like some trash got washed into a bearing, maybe a main or rod whiney shruggyLet us know what you find out luck

Last edited by Cab_Burge; 09/24/16 02:49 PM.

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Re: engine siezed, any thoughts on why [Re: Cab_Burge] #2160881
09/24/16 02:53 PM
09/24/16 02:53 PM
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Lincoln Nebraska
RapidRobert Offline OP
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I definitely will Cab


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Re: engine siezed, any thoughts on why [Re: RapidRobert] #2160903
09/24/16 03:33 PM
09/24/16 03:33 PM
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Prospect, PA
BSB67 Offline
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Originally Posted By RapidRobert
he's a busy guy but he will get back to me when he opens it up. I was not involved in the build but his OCD matches mine (& then some!). he said the shop assured him that P/V collision was not possible with his dimentions (lift/piston amt in the hole). he said the ring gapping was the norm & bearings iirc between 2-3 tho plastigauged. all the final prep we did was standard procedure AFAIK but I feel bad like maybe I missed something. well I guess it is somewhat conjecture for now but I will post how it turns out


Hmmmm.

I would not consider someone OCD if he relies on the shop for PV clearances and his use of plastigauge for checking bearing clearances........

Re: engine siezed, any thoughts on why [Re: RapidRobert] #2160915
09/24/16 03:46 PM
09/24/16 03:46 PM
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Sacramento CA
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Morty426 Offline
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What was the temp and oil pressure when it "slowed down"?

Re: engine siezed, any thoughts on why [Re: Morty426] #2160968
09/24/16 05:30 PM
09/24/16 05:30 PM
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Lincoln Nebraska
RapidRobert Offline OP
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BSB67, point taken. Morty, same no waver which you would expect on the water temp. it happened FAST, out of the clear blue/no warning, with one or two seconds total from first hiccup to dieing & closer to less than 1 second


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Re: engine siezed, any thoughts on why [Re: RapidRobert] #2161017
09/24/16 08:03 PM
09/24/16 08:03 PM
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So. Burlington, Vt.
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fast68plymouth Offline
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We're any of these sand or bead blasted?
Intake manifold
Valve covers
Oil pan
Timing cover

I ask because I've seen this done on many occasions, and when the post blasting cleaning procedure isn't 100%, you often end up with a situation like what was described.


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Re: engine siezed, any thoughts on why [Re: fast68plymouth] #2161033
09/24/16 08:26 PM
09/24/16 08:26 PM
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Lincoln Nebraska
RapidRobert Offline OP
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I will add that to my list of questions


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Re: engine siezed, any thoughts on why [Re: fast68plymouth] #2161048
09/24/16 09:18 PM
09/24/16 09:18 PM
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Cincinnati, Ohio
Challenger 1 Offline
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Originally Posted By fast68plymouth
We're any of these sand or bead blasted?
Intake manifold
Valve covers
Oil pan
Timing cover

I ask because I've seen this done on many occasions, and when the post blasting cleaning procedure isn't 100%, you often end up with a situation like what was described.


iagree

The only thing I glass bead blast in a engine is iron rods and crank to be able to check for cracks and that's it.

Definitely never aluminum anything, especially not a intake manifold.

I learned this on my own the hard way when I was about 19-20 years old and did my own 340 rebuild and used my bosses bead blaster cabinet.

Now I use a steam pressure washer to prep my rebuilds.

Sounds like it spun a bearing... frown

Re: engine siezed, any thoughts on why [Re: Challenger 1] #2161055
09/24/16 09:22 PM
09/24/16 09:22 PM
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Lincoln Nebraska
RapidRobert Offline OP
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it's gonna be interesting what it ends up being


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Re: engine siezed, any thoughts on why [Re: RapidRobert] #2161197
09/25/16 03:13 AM
09/25/16 03:13 AM
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Northern Calyfornua
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Sxrxrnr Offline
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Main bearing clearance too tight. Possible rod, but I like main. You did not suggest hearing knock as engine slowly slowed down. Just sayin.

Re: engine siezed, any thoughts on why [Re: Sxrxrnr] #2161201
09/25/16 03:29 AM
09/25/16 03:29 AM
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Lincoln Nebraska
RapidRobert Offline OP
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I heard a very slight what sounded like a metallic contact of some sort & it starting to slow down (both at the same time) & I looked over at the tach cuz I thought I had let up on the throttle & I started to throttle it back up & it died. all this took place in about 2 seconds from start to finish & I was thinking later I shoulda killed it on that first contact however slight I heard but it died in about the time it would have taken me to reach the kill switch cuz I was not sure where exactly the switch was (he fired it up/I twisted the dist/pointed the light/kept the throttle open/checked for leaks). EDIT SXR I reread your post & there was the one slight contact rather than a continual interference (if that helps)

Last edited by RapidRobert; 09/25/16 03:40 AM. Reason: thinking further

live every 24 hour block of time like it's your last day on earth
Re: engine siezed, any thoughts on why [Re: RapidRobert] #2161218
09/25/16 04:49 AM
09/25/16 04:49 AM
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Fresno, CA
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A friend of mine had somebody else build a 440 for him a number of years ago. They put the wrong bearing shells in the block (no oil holes)...I think his wife was about 20 miles from home when the motor seized...\

Re: engine siezed, any thoughts on why [Re: RapidRobert] #2161260
09/25/16 10:50 AM
09/25/16 10:50 AM
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Stinnett, Tx
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rumblebee4232 Offline
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how tight was piston to cylinder wall clearance?? the time frame would be about right for the pistons to seize in the cylinders if the clearance was too tight..

Re: engine siezed, any thoughts on why [Re: rumblebee4232] #2161265
09/25/16 10:58 AM
09/25/16 10:58 AM
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Blair County,PA
62maxwgn Offline
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One can surmise all day long but the correct answer will come when you take it apart! no

Re: engine siezed, any thoughts on why [Re: 62maxwgn] #2161275
09/25/16 11:33 AM
09/25/16 11:33 AM
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North Dakota
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Once the engine cooled to ambient, is it still locked up? My thought would be insufficient piston/wall clearance. I've been involved in a case with a tight bearing. The bearing wiped but didn't lock the engine up.


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