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i wouldtry checking the valvesto make sure they havethe right gaps between the valves and the rockers if it dose then you may have bad rings on the piston you can try to add a little oil to the cylinder and recheck if compression go up then its the rings that need replaced
YEs it is possible . You have to remove the head and sump and there will be a ridge at the top of the cylinder that has to be removed before the piston will come out . If the ring is broken then I suspect that the bore will be scored and new rings will be a waste of money as it will require a rebore to fix and that means all pistons have to be replaced
have the fault codes read to determine if any sensors are out of parameters from the engine rebuild. If you did not get a rebore and you used existing pistons the smoke may be from excessive ring clearance and worn ring grooves in the pistons . I am not a believer in wearing in as all wear only gets worse (not better) but in this case may be some normal use will allow the rings to reseal in the worn ring grooves over time
either worn out piston rings or cracks in the combustion chamber.
replace your piston rings and cylinder head gasket. then bring your cylinder head to a machine shop to have it resanded.
if cracks are present in the combustion chamber, then one of the best solution is to have it rebored (to widen the current diameter of the combustion chamber) and replace your pistons with the correct diameter of the new hole.
carbon on sparkplugs are caused by oil in the combustion chamber.
here are some things to do:
1. replace the sparkplug
2. replace your head gasket
3. check if your ignition timing is correct (timing in the distributor, camshaft, and crankshaft)
if these does not solve your problem, try this:
1. have your cylinder head checked for leaks/cracks
2. replace your piston rings
lastly, if all of these dont work, this is the solution (but quite pricey)
1. have your head rebored. reboring the cylinder head means making your combustion chamber wider so cracks/leaks on the wall will be removed.
2. after rebore.. you have 2 options: resleeve or replace piston rings. Resleeve means inserting sleeves in the bored chamber to replace the removed part. replacing pistong rings is also an alternative since your old one will not fit anymore ot the rebored head.
yes... overheating can cause issues in your piston/cylinder head. if your cylinder head is made from aluminum and not metal, overheating can cause cracks and bends in your cylinder head. if this cracks occur inside the combustion chamber, then proper compression cannot be attained. you need to rebore then resleeve your combustion chamber and change the pistons to fix this issue. this will also require resurfacing of cylinder head to ensure that it does not create leaks against crankcase.
If you changed rings and valve gaides before you fitted new rings have you check cylinder block?it mybe cylider worn out so it was to rebore engine block and put new piston with new rings. the ather thing it hapen sometimes when you fitting piston rings, check how piston rings is it should be all piston rings defrent direction inside the piston groves. Use original parts.