Can I unseize an honda 4 cylinder engine without removing engine
What I want to do is remove oil pan.disconnecte pistons from crankshaft move them up and down individually. Whichever one is the hardest is going to be the one that needs replaced. Is this possible? Or does all pistons sieze at the same time?
The odds are that if one piston seized all of them seized along with the main bearings and the rods.
Cost wise a drop in engine from a salvage yard will be cheaper then having the present engine rebuilt even if only one piston has to be replaced.
I have rebuilt engines in the past, one time it was for a "rare engine" and the only one I could obtain had rusted pistons. Fitting pistons properly is a very precise field and it does not matter if the cylinder walls are scored or not- the major cost remains the same. The engine has to be torn down all the way, new bearings just make sense because for all the work it takes it had better last as long as a new one. It took one week for the engine shop to fit the pistons. One day to reassemble the engine and a second day to put the engine in.
Now if I could have found a drop in engine, the job could have been done in one or two days. The machine shop work alone was more then the cost of putting in an alternative engine (and transmission).
Additionally, unless you have rebuilt an engine before, plan on having to do the job twice! Once just to find out your better idea isn't and a second time because you tried to take a short cut the first time (like only replacing one piston).
If you can't turn the engine over then you are not going to be able to disconnect all of the con rods anyway. No short cuts here.
It will not be the pistons seized but the bearings
The motor has to come our and be rebuilt.
The question is how did you seize the engine?
Looking after it was the cheap option.
Would that it were that simple. If it seized how do you propose to move the piston(s) by hand. As already said it's likely that the big end and main bearings are shot. An exchange engine is the sensible route.
Since you don't have a clue what you're doing I'd recommend just putting a used motor in the vehicle.
Did the timing belt break and the motor won't turn because the valves are hitting a piston? If you ran it out of oil you'll need a complete rebuild not just a patch job.
Maybe. You'll find out after the head is off. The seized cylinder will likely be visibly galled too. You may need a big mallet to break the stuck piston up to get it out.
Usually if one piston seizes, the other bores and pistons are shot. Obviously you might be able to remove the oil pan with the engine in the car, but you won't be able to fix it with the engine in the car.
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