OP
OP
Doesn't sound too hard and can't be much harder than rebuilding the head...
Technical How do you replace pistong rings without removing engine?
- Thread starter Momanatorz
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Technical How do you replace pistong rings without removing engine?
OP
OP
Ok so new big end bearings, what about the con rod bearings/shells ? they should be good?
OP
OP
I'd do all you say if i had the facilities or money mate 
the clutch is fine
this is just a learning car for me, 1st car if alls good in the end. if not i rather try an fix it to learn about cars
the clutch is fine
this is just a learning car for me, 1st car if alls good in the end. if not i rather try an fix it to learn about cars
Big end bearings are the lower conrod bearings. They are a split bearing in 1 halves which you can replace when you remove the bearing caps to remove the pistons.
upper conrod bearings or small end bearings you cant change because these are pressed into the conrod.
Main bearing shells are the crankshaft carrier bearings.. what hold the crankshaft to the block.. cant change these eigther without removing the crankshaft.
but to change half the bearings is better than none at all.
I do recommend though that you dont try doing this with the block in the car, the reason why its done with the block out is because if the engine is so worn it needs new rings, there maybe other components that are worn.. bores might even be too worn to take new rings, or at the very least require honing to ensure the rings seal properly. So engine builders take this opportunity to inspect the components of the engine, and change any leaking seals/gaskets, and its also important that no dirt gets in the bearingshells when you re-install the pistons.
But you cant get the bores honed with the block in the car as it has to go on a machine.
If you put new rings in, and later on find it hasnt cured the problem you will have to pull it all apart again, and if the cost of a rebore is too much may find the engine is scrap.
upper conrod bearings or small end bearings you cant change because these are pressed into the conrod.
Main bearing shells are the crankshaft carrier bearings.. what hold the crankshaft to the block.. cant change these eigther without removing the crankshaft.
but to change half the bearings is better than none at all.
I do recommend though that you dont try doing this with the block in the car, the reason why its done with the block out is because if the engine is so worn it needs new rings, there maybe other components that are worn.. bores might even be too worn to take new rings, or at the very least require honing to ensure the rings seal properly. So engine builders take this opportunity to inspect the components of the engine, and change any leaking seals/gaskets, and its also important that no dirt gets in the bearingshells when you re-install the pistons.
But you cant get the bores honed with the block in the car as it has to go on a machine.
If you put new rings in, and later on find it hasnt cured the problem you will have to pull it all apart again, and if the cost of a rebore is too much may find the engine is scrap.
If your short of money why not look on ebay for replacment engine, can pick one up for betwwen £50-£100. You can then have the other engine to take apart and learn from, recondition at your own time. If your girlfriend works in a garage then im sure they would let her borrow an engine hoist for a day or two to swap them out..
OP
OP
i live in london she lives in kent
but if it still is burning oil after i might consider replacing the engine for en ebay one.. i have found some cheap ones with 65k etc, mine is 85k...
Hi, piston ring sets arent terribly cheap.
If you are going to go ahead it needs to be done properly so your not wasting your money. If you do go ahead though your engine would be in better condition than one on ebay.. but only if its done properly.
Also, if the bores are beyond standad ring size in terms of wear.. a professional check will allow you to make an informed descision.. ie, getting a replacement engine before buying a piston ring set.
If you are going to go ahead it needs to be done properly so your not wasting your money. If you do go ahead though your engine would be in better condition than one on ebay.. but only if its done properly.
Also, if the bores are beyond standad ring size in terms of wear.. a professional check will allow you to make an informed descision.. ie, getting a replacement engine before buying a piston ring set.
You also need to look at the piston to know what ring set you need, if you insist on doing it your way.
Care to define 'rebuilding the head'?
Cheers
SPD
Care to define 'rebuilding the head'?
Cheers
SPD
OP
OP
Compression test shows piston rings are fine, but are these normal ? in order of cylinders... 213psi 209psi 219psi 219psi
It seems it's burning water/coolant, not oil 'anymore'...
new head or get it skimmed methinks
It seems it's burning water/coolant, not oil 'anymore'...
new head or get it skimmed methinks
The 209 looks odd, but its within a reasonable range of the 219s so nothing to worry about.
Have you just not rebuilt the head?
Cheers
SPD
Have you just not rebuilt the head?
Cheers
SPD
OP
OP
yeah, but after 2 weeks it started to smoke. thought it was oil at first but it was coolant... it randomly stopped smoking for a second and slowly came back. i think its strange
i know i should'a had it skimmed in the first place so dont moan at me for that ol, but i thought it'd be alright ... ah well !
OP
OP
I'm lookin at a head on ebay and was wonderin if a 1200cc would work with my engine? sorry if it's a silly question haha! i thought maybe the blocks are different but heads similar in the 1080/1200cc engines?
Well take it off again, and get it pressure tested then, if ok, get it skimmed.
Cheers
SPD
OP
OP
What does pressure testing involve?
The machine shop will seal up all the water holes then pressurise the head and make sure it holds pressure.
They are looking for internal fractures.
Cheers
SPD
