vwmilo
Member
Hello, first time rebuilding a TDI. its an 02 jetta TDI with about 100k. engine oil gummed up and solidified causing serious problems (ticking noises and low compression on 3 & 4). not 100% sure why this happened but, I think the combo of old engine oil, a veggie oil conversion, engine running cold (stuck open thermostat? veggie conversion heat exchanger?), and pre-existing excessive blow by...
Pulled the head and oil pan and pushed pistons out through top. pistons were very dirty. stuck rings on 3 & 4 with galling on pistons and cylinders. I honed the cylinders until vertical galling marks were barely visible.
Should I replace the pistons? or at least these two? I think they are re-usable. I can sand the galling off the pistons easily (it's pretty light).
If I do re-use, is there a good method to cleaning the carbon off the pistons?
pulled a couple main bearing caps and the bearings look new so I put them back. I intend on replacing the rod bearings along with the rings and all bolts (they are TTY right?).
thanks for any pointers!
Pulled the head and oil pan and pushed pistons out through top. pistons were very dirty. stuck rings on 3 & 4 with galling on pistons and cylinders. I honed the cylinders until vertical galling marks were barely visible.
Should I replace the pistons? or at least these two? I think they are re-usable. I can sand the galling off the pistons easily (it's pretty light).
If I do re-use, is there a good method to cleaning the carbon off the pistons?
pulled a couple main bearing caps and the bearings look new so I put them back. I intend on replacing the rod bearings along with the rings and all bolts (they are TTY right?).
thanks for any pointers!