Lifter check
12-05-2016, 09:06 PM
#16
Nordschleife Master
944 Lifter
12-05-2016, 10:12 PM
#18
Nordschleife Master
12-06-2016, 01:36 AM
#19
Racer
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Good tip. 
I recognize them as VW 8V lifters (maybe not exclusively VW, but used in VWs nonetheless).
I was going to say that the 944 ones looked to me to have a different style at least, but MAGK944 confirmed it's more than just looks that are different.
As for the video... I like the idea of pre-oiling the lifters from an initial lubrication standpoint, but "pre-filling" them to purge the air is pointless. The guy in the video doesn't seem to get this, he's correct about letting them bleed down before firing the engine, but doesn't seem to realize that when they do, inevitably some air will get in anyway. Lifters do not live in a vacuum.
He's basically tediously recreating a process manually that happens within the first few seconds of starting the engine. Although lifters are not flow-through per se, it's also not actually correct that the "same oil will be trapped in them for a long time", either. Every time a lifter bleeds down naturally (from sitting), there is at least a partial oil/air exchange as the lifter "pumps back up".
Air will get purged the same way it does in any other part of the oiling system, - when pressurized oil forces it out. The check valve is only closed under load from the cam lobe, otherwise it's open to cycle oil in/air out. I have seen all kinds of crazy methods people go to with syringes and stuff trying to "pre-fill" lifters and I'm like YGBSM. I mean, it doesn't hurt anything (unless the lifters are overextended), but there are simply better uses of our time.
I was going to say that the 944 ones looked to me to have a different style at least, but MAGK944 confirmed it's more than just looks that are different.
As for the video... I like the idea of pre-oiling the lifters from an initial lubrication standpoint, but "pre-filling" them to purge the air is pointless. The guy in the video doesn't seem to get this, he's correct about letting them bleed down before firing the engine, but doesn't seem to realize that when they do, inevitably some air will get in anyway. Lifters do not live in a vacuum.
He's basically tediously recreating a process manually that happens within the first few seconds of starting the engine. Although lifters are not flow-through per se, it's also not actually correct that the "same oil will be trapped in them for a long time", either. Every time a lifter bleeds down naturally (from sitting), there is at least a partial oil/air exchange as the lifter "pumps back up".Air will get purged the same way it does in any other part of the oiling system, - when pressurized oil forces it out. The check valve is only closed under load from the cam lobe, otherwise it's open to cycle oil in/air out. I have seen all kinds of crazy methods people go to with syringes and stuff trying to "pre-fill" lifters and I'm like YGBSM. I mean, it doesn't hurt anything (unless the lifters are overextended), but there are simply better uses of our time.
12-06-2016, 01:32 PM
#20
Rennlist Member
I thought that was pretty dumb to prefill the lifters too. I'm sure they didn't have someone at the factory taking them all apart and filling them with oil prior to putting them in the engine!
12-06-2016, 09:41 PM
#23
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Nothing would beat complete disassembly, but given the lack of a retaining ring and the peening complications with these, easier said than done.
Next to that, I'd go ultrasonic.
If all else fails, I suppose there's repeated soaking/agitating in a solvent bath, but that's sub-optimal, and you'd want to make sure you got everything out including the solvent.
You might hear or read about various shadetree methods of adding chemicals to your engine oil prior to an oil change to "flush all the crud out of your system", but I wouldn't.
Not this Auto Union
