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Author Topic: ADJUSTING HYDRAULIC VALVES???  (Read 2617 times)

October 31, 2020, 09:33:26 pm

thomas m

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ADJUSTING HYDRAULIC VALVES???
« on: October 31, 2020, 09:33:26 pm »
Under what circumstances do the hydraulic lifters have to be adjusted?
Is it just a matter of keeping valve dimensions in spec after reseating the valves?
If not grinding material from the valve seat are they just left alone?
Is this a standard procedure in a good machine shop?
Comments?


Thomas, Original owner since new:
1991 MK2 Jetta Non-turbo 1.6 diesel, Engine Code ME, 5 speed 020 AWY 04120 transmission, Hydraulic Lifters,
320,000 miles
Location: Vancouver, WA
LOOKING FOR REBUILD OPTIONS IN PORTLAND, OR OR ON THE WEST COAST

Reply #1October 31, 2020, 11:35:15 pm

libbydiesel

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Re: ADJUSTING HYDRAULIC VALVES???
« Reply #1 on: October 31, 2020, 11:35:15 pm »
Hydraulic lifters never need to be adjusted. 

The dimensions of the head/valves need to be within spec when the head is rebuilt but there is typically plenty of automatic adjustment within the hydraulic lifters that nothing special needs to be done. 

Reply #2November 26, 2020, 11:08:27 pm

ORCoaster

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Re: ADJUSTING HYDRAULIC VALVES???
« Reply #2 on: November 26, 2020, 11:08:27 pm »
Libby, can one just swap out the mechanical lifters for hydraulic ones?  I found a set of hydros for cheap and considering swapping out the ones I have on the 1.6.  I can't think of other parts that need to be compatible with the lifters to make them work as they are designed.

It may be that I have too much of a turkey stomach going and draining the brain of blood.  Yawn. 

Reply #3November 26, 2020, 11:22:55 pm

libbydiesel

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Re: ADJUSTING HYDRAULIC VALVES???
« Reply #3 on: November 26, 2020, 11:22:55 pm »
No, the hydraulic lifters cannot be swapped into a mechanical lifter head.  If memory serves, the hydraulic lifters are thicker between the surface the cam pushes on and the surface that pushes on the valve stem.  The valves are different also.  I believe the pocket for the valve springs/lifter is recessed slightly deeper on the hydraulic heads also. 

Reply #4November 27, 2020, 11:32:17 am

thomas m

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Re: ADJUSTING HYDRAULIC VALVES???
« Reply #4 on: November 27, 2020, 11:32:17 am »
Browsing  https://www.partsplaceinc.com/catalogsearch/result/?q=head  they differentiate between hydraulic and mechanical heads.
Thomas, Original owner since new:
1991 MK2 Jetta Non-turbo 1.6 diesel, Engine Code ME, 5 speed 020 AWY 04120 transmission, Hydraulic Lifters,
320,000 miles
Location: Vancouver, WA
LOOKING FOR REBUILD OPTIONS IN PORTLAND, OR OR ON THE WEST COAST

Reply #5November 27, 2020, 11:47:55 am

ORCoaster

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Re: ADJUSTING HYDRAULIC VALVES???
« Reply #5 on: November 27, 2020, 11:47:55 am »
OK, dropping that mod idea.  Probably the shortest one I thought about in a long time. 

 

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