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Engine Specific Info and Questions => TDI Engine -General Info => Topic started by: voodoo on February 28, 2012, 03:52:10 pm
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after some thought, it is my opinion that the vw hydraulic lifters are abundant inexpensive disposable high wear parts that should be replaced about as often as the timing belt or water pump.
in some peoples opinions the hydraulic lifters may be responsible for premature catastrophic engine failure, and after viewing several examples of worn out 200,000 mile oem vw lifters with the top caved in, I think a new set of hydraulic lifters installed at the same time as a timing belt and water pump is a good idea.
related to this , the vw cam and lifter system is a high friction flat tappet design, that should use a better oil with more zinc wear additive such as 15w-40 heavy duty diesel oil. although this is a diesel forum and that is the only kind of oil we would ever use, all of the gas vw's have the same flat lifters. older American V8 engines also have flat tappet cams and many show extremely aggressive camshaft and lifter wear when used with EPA approved low zinc modern oil for gasoline engines.
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saurkrat had a similar thread about an aaz head. Might try to search that. IIRC he had some similar ideas to what you did.
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Hydro lifters don't "pump up and hold a valve open" unless there is some other problem at work like excessive oil pressure from a stuck pressure control valve or the valve stems are too long, etc. For your work and expense you will gain lash adjustments every year and 1/2 hp provided the lash never falls out of spec.
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Volvo 2,4 D6 diesel or Audi 2,0 5 cylinder diesel. Both same 36x104x4 intakes.
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they make solid lifters that fit into the hydro heads, no need for different valves just cam and lifters, check out the gasser world, lots of that stuff crosses over and i believe that is what they used on the coverted aaz head.
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they make solid lifters that fit into the hydro heads, no need for different valves just cam and lifters, check out the gasser world, lots of that stuff crosses over and i believe that is what they used on the coverted aaz head.
the shim under bucket solid lifters will work. they are made to drop into where a hydro lifter used to reside..
then the adjusting shim goes UNDER the bucket, so you have to remove the cam to set/adjust the valves..
totally forgot TT sells these things, otherwise i would have suggested them earlier.. good call Trev
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I used Nissan diesel lifters, you can use VW adjusting shims.
(http://i13.photobucket.com/albums/a297/mattif/80q/th_P6100394.jpg) (http://s13.photobucket.com/albums/a297/mattif/80q/?action=view¤t=P6100394.jpg)