It would be easier on a cold engine, mostly because your oil will hopefully had a chance to settle, easier to see the cam and working on a hot motor sucks.hid3 said:Should I do the inspection on a cold engine or is it ok to do it on a hot engine? Anyone?
What I have heard for what I consider reliable sources is that a cam is only hardened to something like .0002 inch. if it can be rehardened after polishing, it should be OK, otherwise, new is best. I'm no machinist so take that all with a grain of salt.milehighassassin said:Would this be an opportunity to grind the cam; or don't even bother?
I know but how would that affect the distribution of downward force to the lifter which in turn can affect the rotation of the lifter ?whitedog said:They need to be offset in order for the cam to turn the followers.
Did you change only the camlifters or also the camshaft in November? Also, as I can see your (and your friends) camlifters were metal-shiny, not black in colour, right? What oil were you using after the replacement?dukku said:I have changed the camlifters in november .
A friend of mine that owns a 2002 Bora (jetta in U.S.) , same engine as mine (AJM 1.9 TDI 85 kw pumpe-duse) did same as me and replaced the camlifters with new INA while I replaced orifinal INA with FOLE camlifters.
Both of us had car-startig problems after this change.
Yesterday he opened the engine and inspected the camlifters. They looked like this:
The bad one is the one weared for 2 months wile the good one is the one used for 300 000 km .
Since the first day I mounted new camlifters I begin to get more disapointed by the way my car starts in the morning . The apogee was in january when I had to pull the car at - 17 degrees , after 2 minutes of cranking with smoke and no start.
So I decide to look at mine's and ...surprise !After 15 000 km they are looking bad.
The one i weared for 400 000 km looks like new . I changed them because the noise the engine were making at the first start in the mornig for 10-15 seconds , till the oil got to them.
What could be the cause of this intense wear in just 15 000 km? Did I do something bad when I mounted them?
I keepd one camlifter from the first ones and you got to belive me . The 400 000 km camlifters have NO patterns. Tomorrow will send a picture. Tey look just like new ones. They were just noisy till the oilpressure "inflates" them.hid3 said:I guess that was your mistake. Changing only lifters is a bad idea, since cam lobes can have a 'wear pattern'. That would explain why new lifters got chewed so quickly. Camshaft + ALL lifters should be changed at once. Besides, new lifters should be black in colour, they seem to be an 'updated version'.
Did you change the cam when you changed those followers the first time?dukku said:This is the deepest patern that I got on the old camlifters that last for more than 300 000 km and I changed them in november and the car started to make starting troubles and noises 2-3 days after I made the change .
I only had tme to inspect them last week but they turn to junk few houndred kilometers after I mounted them and they keep working worst day after day.After 15 000 km they look like this :
Will Take pictures to the camshaft to see every cam so you can all see and give me a piece of advice. A new cam is betwen 300 and 1000 dollars and I an not in the mood to spend extra money .
Remember that only the lifters were replaced the first time and cam and lifters should always be replaced together due to the wear pattern.Dimitri16V said:so... it looks like the lifters then..