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2.3L ('83-'97) Timing comprehension advanced knowledge


Gerry Fitz-Gerald

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If I take a perfectly running engine. take the timing belt off.turn the Crank (only)360° (one turn).Put the timing belt back on.dose It runs exactly the same?
It's Distributorless, So coil packs. So in this theoretical discussion. Nothing else. Moves and no component of the computer system will register any changes. This is what KILLED MY Dodge.
( Done by An S.A. E certified mechanic Who insisted on helping me replace my Distributor. then left the key on and sat there with the distributor plugged in spinning it. I never knew tell than you could be a 180 out on the computer. But it was a hell of a fun Drive going home at 120 mile An hour wouldn't run any slower and so much smoke out the back You couldn't see nothing behind me. Hauling ass Right through fort worth.)

Basically, I've had this argument with so many people. You know, like when you have the time belt off.And they're talking about intake and exhaust stroke and you're going what the F ( All the Crank does is create a Stroking motion and position the pistons with the proper separation for proper timing Oh, and a Connection to Transfer power)

I'm sick of being told i'm wrong!!!!! So thank you to all of you for supporting Me
A now 30 year discussion. And most of all, thank you for letting me know.I am so right.
 
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alwaysFlOoReD

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It runs backwards.







Sorry, its too late for my thinking cap. So just smart ass answers, not smart ones.
 

rusty ol ranger

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If I take a perfectly running engine. take the timing belt off.turn the Crank (only)360° (one turn).Put the timing belt back on.dose It runs exactly the same?
No.

Youll have #2 at TDC (assuming you started with marks aligned)....the valves on that cylinder will not be in the proper postitions to run.

If im thinking about this correctly.
 

2011Supercab

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If I take a perfectly running engine. take the timing belt off.turn the Crank (only)360° (one turn).Put the timing belt back on.dose It runs exactly the same?
Yes, assuming all you did was remove the belt, turn the crankshaft 1 full revolution (360°), put the belt back on.
 

Uncle Gump

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Yes...
 

rusty ol ranger

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Yeah these guys are right. 360* would put you back to where you started. Not on the next cylinder
 

pjtoledo

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in theory, yes.
in reality, maybe.
if the cam was locked in place, yes.
when timing belts/chains are removed there is nothing to prevent the camshaft from rotating because
a lifter/follower may be on a cam lobe. spring pressure will attempt to push the lobe away.
 

superj

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since the crank turns twice to the cams one turn, yes, it will be like you never took the belt off because the piston will be back in the same position. (except as noted above)

one upward stroke is compression and one is pushing the burned fuel charge out into the manifold, depending on which valve is open.


its called a power w, how it works.

\: down leg on w is piston pulling in fuel
/: first up of w is compression stroke
\: second down leg on w is power from combustion
/: second up leg is piston pushing burned fuel charge out


that is a very broad description but gives you an idea of what each stroke does of the crank


and, welcome to the group
 

Mechrick

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Loaded question.

Does the engine have a distributor? Cam timing and ignition timing have to be synced with each other. If you turn the crank one revolution, but the cam and distributor are locked stationary, then yes, nothing changed.

For distributorless ignition, the above doesn't factor in.
 

pjtoledo

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since the crank turns twice to the cams one turn, yes, it will be like you never took the belt off because the piston will be back in the same position. (except as noted above)

one upward stroke is compression and one is pushing the burned fuel charge out into the manifold, depending on which valve is open.


its called a power w, how it works.

\: down leg on w is piston pulling in fuel
/: first up of w is compression stroke
\: second down leg on w is power from combustion
/: second up leg is piston pushing burned fuel charge out


that is a very broad description but gives you an idea of what each stroke does of the crank


and, welcome to the group

so, Otto has been replaced ?

must admit I've never heard of the "W" description. W blocks yes, W cycles no.
 

superj

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Did i write it wrong? I think i have it right?

Its been a while since i went over that stuff
 

19Walt93

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If you're taking the belt off, why not just turn it to TDC and align the cam sprockt with the mark? If it has a distributor that sprocket needs to be aligned, too.
 

Bgunner

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Well if it is an interference engine no it will not run correctly as you now have a bent valve. :icon_twisted:

If there is a synchro in place of the distributor then you will have issues. If there is just a sensor for the cam then in theory there should be no issues. With ignition off the ecm should not be reading the sensors so the computer should not know the difference.

I guess what I'm trying to say is it is a engine specific thing. Just my 3:12 am. 🧠 trying to comprehend the theoretical question.

EDIT: wait the syncro is usually run off a cam so it should not make a difference there. Like I mentioned my brain 🧠 is not with it ATM.
 
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19Walt93

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If we're talking about a Lima 2.3, it's not an interference engine.
 

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