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#1
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Clacking head? Hydraulic lifters? MUST READ
OM60x hydraulic lifter "reset" procedure | Mercedes-Benz Club of America
Quote:
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http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42 |
#2
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Isnt that standard practice for all hydraulic lifters, I had a vw diesel in which anytime they were removed, I bled them down installed them and let them pump up. Otherwise the valves would kiss the pistons.
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2012 BMW X5 (Beef + Granite suspension model) 1995 E300D - The original humming machine (consumed by Flood 2017) 2000 E320 - The evolution (consumed by flood 2017) |
#3
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What you do, and what the guy did before, are two different things! Also the FSM does not mention this procedure that I can find.
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http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42 |
#4
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This person's thumb can exert more force than a 603 valve spring???
Sixto 87 300D |
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Quote:
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#6
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Uh...
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#8
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hmm - hahaaha - it does sound real funny when the post says to press those plungers with your thumb, That must be one mighty strong hand.
I had to use a big vise.
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2012 BMW X5 (Beef + Granite suspension model) 1995 E300D - The original humming machine (consumed by Flood 2017) 2000 E320 - The evolution (consumed by flood 2017) |
#9
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There's no need to press the plungers. An indicator of an old/worn/failing lifter is when you can press the plunger in. New ones are rock hard and DO NOT need to be pressed in or cycled to get oil out. At. All.
Something else changed which fixed the problem... twiddling the lifters did nothing but exercise his thumb. |
#10
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I suspect what he quoted was his real experience. So in a drill press test situation if one will not pump up or bleed down it is seized or the internal spring is broken or the internal check valve is open or the piston bore fit is history. Hence the terms collapsed,,stuck or sticking lifter if the piston is not mobile. Plus just pretty disfunctional if completly collapsed or unable to hold oil from escaping at all. Another choice perhaps is the piston went higher when it pumped up and got stuck on the normally unused area of the bore in the last application probably on existing varnish.
His working them resulted in getting the piston mobile. Might have even been rust from sitting too long or varnish as I mentioned.. The bottom line is what he describes is quite possible in my mind. Anytime you have an engine down that far testing the lifters with a drill press takes little time. Put the lifter in a bath of oil and use the down pressure of the drill press to see how they pump up and respond in comparison to each other. Remember that he observed the number two cylinders valve remaining open. In my mind this was just a stuck lifter piston. The piston was stuck in the position of its last application. If the past requirement for the lifter had seized the piston lower in the bore the lifter may have just created excessive valve lash noise.. His spin was the lifters used where not from the same bores orperhaps even engine. What he encountered could not occur had they been from them. The lifter piston would never be that high in the bore. My own experience with lifters is limited. The only ones I took apart where my extra large ones in my 1950 buick as some where stuck or sticking from twenty five years of the engine sitting. Got them all functioning well. Those particular lifters where expensive devils to buy replacements for. Last edited by barry123400; 09-27-2012 at 12:37 PM. |
#11
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I understand what he described, but IMO the root cause was not the lifter internals. I'm not sure it's even possible for a "frozen" lifter internal mechanism to prevent a valve from closing. Something else was going on that prevented the valve from seating.
MB states to keep lifters in the same bore only to keep wear patterns even, i.e. same lifter on same cam lobe. |
#12
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On VWs I've worked on I was always advised to put the lifters in a cup of oil to "prefill" them.
Wouldn't the action of opening the valve make the lifter bleed down? -J
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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E. |
#13
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Quote:
If it had been the original lifter with a stuck piston the valve would have closed and the worse senario if any would have been some lifter noise because of the additional valve lash resulting. Clear as mud? I find this difficult to describe. I feel it is probably accurate all the same. |
#14
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Whats the purpose on the galleys into the lifter piston?
__________________
http://superturbodiesel.com/images/sig.04.10.jpg 1995 E420 Schwarz 1995 E300 Weiss #1987 300D Sturmmachine #1991 300D Nearly Perfect #1994 E320 Cabriolet #1995 E320 Touring #1985 300D Sedan OBK #42 |
#15
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To provide pressurized oil into the lifter, to "pump up" the internal chamber and make the little button stick out. With restricted oil flow to the lifter (or with worn out lifters), the little button will squish in when it's not supposed to, causing the ubiquitous OM60x lifter tick.
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