Hyd. Lifters
 

I have a 1995 850 non-turbo that I pulled the head. It had a burnt #4 ex. valve. How do you tell if the hyd lifters are good? About 6 of them I can depress the inside and the others are hard. Are they supose to depress when the oil is out? I assume the other ones are probably a little gunked up and they should depress a little. Do they have seals (rubber or?) inside and can you clean them out? Any ideas other than replacing them all which I might have to do.

RE: Hyd. Lifters
 

If the car has been sitting a while before you took it apart they might have bled down before you pulled it apart.
I would leave them soaking in oil and put them back in.

RE: Hyd. Lifters
 

I was able to compress all in a vise (carefully with a cloth to not scratch) and get old oil out. I used solvant to cut the buildup and will reinstall them this weekend with the rebuilt head. Has anyone heard that there was a bunch of bad exaust valves in 850's? The machine shop said there wasa bulletin regarding some origional valves. Will post on the lifters and how they work after cleaning.

RE: Hyd. Lifters
 

Listen (read) carefully to what Tech said.The object is to have them "hard" when the engine first starts which is accomplished by soaking them in oil for a day or so. Keep track of which lifter went where on the head since they all have unique wear patterns.

...Lee

RE: Hyd. Lifters
 

And after everything is back together, you may want to TLC the engine with full-synthetic 10W-30 (5W-30 for frigid regions), even though full-synthetic is most beneficial for turbocharged/high-performance engines.

Happy New Year,


JPN