Question about 1993 Isuzu Pickup

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Timeing Hello,I put my 2.3---4ZD1 engine in a machine shop,had it bord 20 over.Replaced all the pistons, 1 rod, and reworked the crank shaft and head.I put the engine back together and started it up.The rocker arms and or valves chatters, and the starter sounds like its timeing is to high.I've ajusted the timeing every way I can think of,I even checked and rechecked the timeing belt thinking I have it a notch out.But it was not. Is it possible that I might have it 180 degrease out on the distributer? Or would it even crank at 180 degrease out.Can yall tell me what I need to do.The timeing belt is timed at 0 degrease TDC.

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Check all vacume lines some will cause your motor to act 180 out and also if valves are chatering get a feeler gauge and set them to 12 if to much drop down one..

Posted on Dec 02, 2008

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I need to know if you did'nt oil the pistons and piston rings or prime the motor do i need to pull it out and do it


Pete, did you do a complete engine reassembly with out lubricant.
If you did, you could have real problems, especially with crank and rod bearings.
Pistons and rings could be oiled through spark plug holes, 1/2 oz. in each cylinder, take cylinder to bottom of stroke, then give a blast of compressed air to help distribute oil in each cylinder and then rotate engine a few times to complete oil distribution.
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Drain oil, and refill to correct spec's.
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."

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ENGINE KNOCK


It's related, The connecting rod pins may have gotten damaged and needs to be replaced. The knock you are getting sounds like the piston slap due to the connecting pins being damaged and the piston is moving around the cylinder walls and connecting rod. When the spark plugs wire was crossed the wrong spark plugs fired while the piston was still on it's way up the cylinder as to having it fire on the way down. This will cause stress to the valve's, piston, connecting pins, crank shaft, and main bearings. In short all the internal lower moving parts to an engine. Good Luck and have a compression test on all the cylinders and the one that is damaged will be the lowest compression reading.

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If the timing was off, from my experiance, it would cause the valve to go down threw the piston. The rod more than likely was on its last leg before the repair. Because the timing actually keeps the crank shaft (that turns the rods/pistons up and down) and the cam shaft (makes the valves go up and down) in sequence. So if the timing were off then the valves would be down when the piston were up. This could cause the rod to break but usually it either cause the valve to punch a whole threw the piston or the piston to bend the valve. Either case is very bad but so is a broken rod.

Hope this helps

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