83C_CamAroZ28

iTrader: (12)

rebuilt 350...

the engine turns over but struggles 2 turn over...ill post up video later...


wat can cause this?..:/...

83C_CamAroZ28

iTrader: (12)

any one?...

83C_CamAroZ28

iTrader: (12)

sorry for the delay on video...

ok i have a mini torque starter and it turns the engine over struggling...

so 2day i went ahead and bought a new stock starter cuz i thought the mini torque starter was goin out...

i put the stock starter on and it won't even turn it over...:/...

wat can cause this?...:/...

help plz...

skibum2100

A weak battery could cause this...but so could a seized engine. You may want to have your battery load tested at your local parts house.
Can you put a wrench on the crank pulley and rotate the engine by hand?

83C_CamAroZ28

iTrader: (12)

i checked the battery i took it 2 autozone and they told me it was good...they checked it like 4 times...at first u were able 2 turn it with a wrench...but now i can't...:/...

skibum2100

Sounds like a mechanical problem. The rebuilt engine may need to be torn apart again...darn. Talk to whomever did the rebuild and get their opinion first.

You may need to open up the timing cover and disconnect the timing chain to see if just the bottom or the top of the engine has difficulty rotating.

InfernalVortex's post #26 had some good information about hypereutectic pistons in a similar situation...
https://www.thirdgen.org/forums/tech...hat-did-i.html

Hopefully we can get somemore input on this.

InfernalVortex

iTrader: (4)

Yeah that sounds mechanical. Pull the spark plugs out and try to turn it over by hand. It shouldnt be that difficult. If it's not turning over by hand you need to pull the engine apart. If you dont have the ability to do that, there are at least some trouble shooting measures you can take. First of all I would remove the serpentine belts or v-belts you have completely - this rules out an issue with the accessories, although a seized accessory can usually be powered through easily. Then loosen up all the rocker arm nuts so that turning over the engine doesnt actuate the valves at all. This will tell you if your camshaft timing is off perhaps, and takes a little rotational drag off the engine but not much else. I suspect it wont change anything though, but it's easy enough to do. Just remove the valvecovers and loosen every rocker arm nut several turns. You might want to just take them off entirely, actually.

This is likely bottom end. Could be anything from a bent crankshaft/camshaft or rings not being gapped properly, or bearings being way out of spec - such as if the crank journal diameters are larger than what the bearing is specified for, ie a crank turned 10 undersize with 20 undersize bearings.

Can you give us some more info? Did it run at all? If it ran at all and suddenly its hard to turn over, is it possible you damaged a piston? Can you turn it at all by hand even if it's less than a full rotation?

83C_CamAroZ28

iTrader: (12)

ok thanks 4 the info...

i do apologies for not providing the proper or enough info...

the engine is freshly rebuilt...
no the engine has not been started yet...
yes i was able 2 turn the engine over by hand..
now i can'tturn it over by hand it...
i did try 2 started it turned over with the starter easily...
but it didn't start...
the engine all of a sudden got hard 2 turn over andthe starter burned out...
it also bent one of my push rod bad on the #8 piston...
it also slightly bent all the other push rods...

i replaced all push rods and rockers...

i put a mini torque starter on and it would turn it over but struggling...
i had the battery checked and it was good...

i think that's everything...:/...
i also have the pushrods and rocker arms loosend up...

i still can't get a video up...:/...

InfernalVortex

iTrader: (4)

I have a feeling your cam isnt installed right. Loosen all the rockers all the way and try to turn over the engine.

You may need to replace pistons if the valves damaged them, you may also need new valves if the pistons damaged them.

Could be something else, but bent pushrods are a bad sign. Maybe if it's a performance build you just dont have enough piston to valve clearance.

Something serious is wrong, dont use an electric starter on it again.

83C_CamAroZ28

iTrader: (12)

ok yea I'm agreeing with the cam maybe installed wrong...:/...

ok so ur sayin that maybe the pistons r hitting the valves or the valves r hitting the pistons???...

i will loosen the the push rods and rockers all the way off...

wen u say not 2 use another electric starter wat do u mean by that?...
wat do i use?...

InfernalVortex

iTrader: (4)

You internal parts hitting and damaging other internal parts. Dont turn that engine over with anything but hand power with a wrench. A starter has a LOT of torque behind it and will cause damage and push through many potential obstructions, ruining pistons and pushrods in the procses. Your hand will feel when something is in the motor not allowing it to turn. it will feel interference and you can stop pushing on it so it wont break anything.

If you had to move the car 20 feet foward blind folded, you'd want to push it by hand so you could feel if the car hit any wall or another car and you'd be pushing it lightly/slowly enough so that it wouldnt be damaged. You wouldnt want to hop in and fire up that big V8 and just drive it 20 feet. That's the idea... if you're turning the motor over by hand then you wont cause any damage because you wont force the motor to turn even though something is locking up.

83C_CamAroZ28

iTrader: (12)

ok i get it...

but it can't b turned over by hand its hard...:/...

ill try 2 turn it by hand again wen i loosen up the push rods and rockers...

InfernalVortex

iTrader: (4)

If you cant turn it over by hand then turning it over with a starter is only going to make things worse. That thing needs to come all the way apart at this point probably.

83C_CamAroZ28

iTrader: (12)

i loosened all the push rods and still nuthin...:/...

i think ur rite...

i didn't want 2 do this but I'm gona have 2 if there isn't a way 2 fix it...:/..