Hello, im about to order new hydraulic lifters but im very confused.
I know from the WIS that there were at least two version of the lifters. One with significant reduced weight.
Early ones weighting 82gramms and the later ones 64gramms. All measurements are identical on both with diameter of 34.965mm-34.975mm (manufacturers say 35mm) and height of 25.5mm-26.5mm (Federal Mogul says 26mm for theirs). See pic:
So WIS now says in document "ra05001192110x" (2110 - Check and replace hydraulic lifters) that the older ones with 82gramms are only supposed to be used with the early style double-valve springs, it is NOT saying that the newer ones could not be used with with the older double valve springs.
Now in Document Number in WIS "ra0500119ta00x" (05 - Technical Changes) it is saying that with month 04 in 1995, weight reduced hydraulic lifters were phased in and they can only be used with the later style single, "conical-shaped" valve springs.
So my questions are now:
- Are those ones "phased in" in 04.1995, the ones with 64gramms? Didnt the conical valve springs appeared earlier? Part-Nr?
- What is the fitting Part-Nr for my car with early style double valve springs? The EPC shows for my car the latest Nr: "A1040501225". Is this latest one some sort of "universal/unified lifter" as this fits in not only M111, M104, M120, M119 engines but also some Diesels OMXYZ and so forth.
- The latest Part-Nrs (A1040501225, A1040501025, A1110500025) shows at INA or Federal Mogul (AE), etc that those have 35mm outside diameter and now a height of only 24mm instead of 26mm!
Old ones (i measured them from my engines .974 00 4324 and my early .970 engine) around 26mm, the listed ones by EPC ones showing only 24mm and have the remark that "only used starting at engine Number .974 005782" while my engine is a .974 00 4324. Im very confused!
I phoned a lot with AE (Federal Mogul, Beru Germany) and they have two ones listed for our engines and the M111, M104, M120 engines. One is called AE FOL124 and one AE FOL147.
They are both supposed to be identical in weight, but the AE FOL124 are 26mm in height while the AE FOL147 are 24mm in height.
So what lifter to get?
The part Nrs. "A1040501225, A1040501025, A1110500025" translate into "INA 420 0042 10" with only 24mm in height but they should fit into my car according to both INA and the original Nr in the EPC.
Im very very confused. Please tell me which ones to buy, and if both the 24mm and 26mm ones "sit" the same on the valve-stem/valve-spring cup