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 find the main and rod factory specs for a GM Crankshaft casting number 6223. Where would I look?

you would have to get the foundry bill of material for that crankshaft
finding the casting foundry will be a job in itself
however crank shafts are cast to a engineering standard (throw distance) and are then ground to a standard size on the big ends and main journals
what ever con rods that are used depends on the block that the crank shaft is installed in as different piston diameters require different strength conrods
the casting number is just a batch number so it may prove a dead end if you are relying on it to get information
where I would start looking is at a engineering shop that regrinds crank shafts as they may have original specs for gm cranks and that number just may indicate what block it was made for and then you may get a heading as to where to look

Apr 30, 2017 | Cars & Trucks

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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.
To pre oil crank and cam and bearings, you could over fill engine with new oil until you feel it is flooding(above) cam then let soak over night, then rotate crank shaft 20-30 times to distribute oil.
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."

Mar 11, 2016 | Cars & Trucks

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Car hesitates and backfires at lower speeds?

check the firing order of the spark plugs and make sure the number 1 piston is on top dead center and start from that check the marks on the crank shaft pulley if donot match your timing belt(or chain) position is no good and double check all pushing rods.

Sep 22, 2012 | 1998 Ford Escort

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Bad pistions on 94 buick centry 3.1l think engion stamp is g dont know if i have to put just pision in or rod assambly

It's rare that a piston goes bad. So, you need to determine why it failed.
Most times, the cylinder wall is damaged during a piston failure making it impossible to just replace the piston. Check the wall for score marks and out of round condition as well as actual size VS original bore size. (correcting that requires machine work) The new piston must match the cylinder bore as it is now, NOT what it was when manufactured. (same applies to rings).
The old rod can be re-used if it is not bent and providing that the big end (crank end) is still round. Again, the rod needs to be assembled by a machine shop as the wrist-pin is a press-in part.
Most times, you will find that the amount of actual work necessary to replace one piston exceeds what would be necessary to replace the engine in both time, $ and reliability.
If you want to try a replacement though, see if you can get a piston/rod assembly that is still in good condition from a blown junkyard engine, Plasti-gage the bearing and replace if necessary, clean out the ring grooves or replace the rings. Use a hand held cylinder hone and break the glaze on the cylinder walls. If you are careful and everything goes well, it MIGHT work.
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How do I change a piston rod for a 2001 pontiac grandam?

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Have cams out of head. need to know chain timeing marks for variable timing. thanks 2005 kia spectra 2.0

get a chilton or hays manual from a auto parts store it will show you the diagram.

listen to me carefully. find out where is piston #1 pull the spark plug out and stick a long flat head screew driver in the hole where was the spark plug for piston #1 and turn the crank-shaft untill the screew driver hits the highest point.
what this means, the pistons go up and down,ok.
now, the screew driver has to come up if it go back down just a little your fucked.

leave the crank-shaft for now. the cam-shaft needs to be properly aligned if not you can damage the valves.

Apr 28, 2010 | 2005 Kia Spectra

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Rebuilding 4cylinder Camry.

For the piston to have touched the crank something is really wrong, worn pin in the piston, extremely worn rod, or bent rod. You need a competent machine shop to check everything and have your crank machined to fit the new bearings.

Jan 09, 2010 | 2000 Toyota Camry

1 Answer


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.

Jan 05, 2010 | 2004 Buick Regal

2 Answers

If timeing chain is bad what will happend to the car

if it snaps, it will push the con-rods thru the engine block, ruin the pistons, break the shims and spacers in the piston bores, other words, you would need a new engine

Sep 07, 2009 | 1989 Nissan Maxima

1 Answer

1996 Saturn SL2 had timing replaced, was on interstate for about 300 miles and threw a rod. If the timing was off could this have caused the rod to break?

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

Jun 28, 2009 | 1996 Saturn SL

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