Hydraulic Lifter Adjustment

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Amskeptic
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Re: Hydraulic Lifter Adjustment

Post by Amskeptic » Wed May 30, 2018 7:00 am

Latest post of the previous page:

sped372 wrote:
Sun May 27, 2018 6:09 am
That helped, thanks. FWIW I added 1/2 qt. of MMO at the last oil change and it's been all quiet since then... for now. I'm not big on magic additives but figured it was worth a shot since "everyone" on theSamba vouches for it.
I'm not big on magic potions either, but some do work in a pinch, and some cars I do not care if the Coolant Leak Stop! In A Bottle! clogs every passage in their cylinder head. I used Engine Overhaul In A Can to reduce the smoking in my poor Lincoln, it worked.

That said, let's agree that Marvel Mystery Oil is another way of saying, "the oil has not been changed enough" (not necessarily under your stewardship, but somewhere in the time line).
Colin
BobD - 1978 Bus . . . . . . . . . . .111,130 miles
Chloe - 1970 bus . . . . . . . . . . . 206,787 miles
Naranja - 1977 Westfalia . . . . . 94,615 miles
Pluck - 1973 Squareback . . . . . 55,510 miles
Alexus - 1991 Lexus LS400 . . . 72,990 miles

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sped372
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Re: Hydraulic Lifter Adjustment

Post by sped372 » Wed May 30, 2018 7:41 am

Agreed... I can only vouch for the last 2.5 years... who knows what happened before then.
1971 Karmann Ghia - 1600 DP
1984 Westfalia - 1.9 WBX

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asiab3
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Re: Hydraulic Lifter Adjustment

Post by asiab3 » Tue Nov 06, 2018 9:56 am

Three shops this year have mentioned to me that they think new hydraulic lifters cannot use the full two turns preload. If this is true, do we think new lifters have a shorter piston bore than old VW lifters, or do we think the oiling hole is located further out on the lifters?

Would a lifter whose oil port is blocked by the piston ever pump up at all? Short of removing the lifter for inspection, is there any test to tell if the bore or oil is compatible with factory settings? (Other than a nice drive after adjustment…) Is there any proof that new lifters are sized differently anyway?

Robbie
1969 bus, "Buddy."
100k miles with me.
279k miles on Earth.

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Amskeptic
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Re: Hydraulic Lifter Adjustment

Post by Amskeptic » Wed Nov 07, 2018 1:42 pm

asiab3 wrote:
Tue Nov 06, 2018 9:56 am
Three shops this year have mentioned to me that they think new hydraulic lifters cannot use the full two turns preload. If this is true, do we think new lifters have a shorter piston bore than old VW lifters, or do we think the oiling hole is located further out on the lifters?

Would a lifter whose oil port is blocked by the piston ever pump up at all? Short of removing the lifter for inspection, is there any test to tell if the bore or oil is compatible with factory settings? (Other than a nice drive after adjustment…) Is there any proof that new lifters are sized differently anyway?

Robbie

Great question. Best experiment would be to line up a factory lifter with a new lifter to see if the oiling hole location differs.

Then a careful full crank-down of the adjustment screw to see what differences in range there might be.

THEN, we can speculate. I see no friggen difference between 1 1/2 and 2 turns as far as dynamic function. The lifter is rotating and moving in and out of its bore by a good 1/2" in normal operation. The oiling covers it all with a half crescent gallery lining up with a circumferential groove. The communication with the gallery occurs primarily at the closed position.

The piston inside the lifter gets pounded to the bottom of the lifter barrel if there is no oil. I do not know of a lifter that is designed to not open the port when the piston is down all the way.
Colin
BobD - 1978 Bus . . . . . . . . . . .111,130 miles
Chloe - 1970 bus . . . . . . . . . . . 206,787 miles
Naranja - 1977 Westfalia . . . . . 94,615 miles
Pluck - 1973 Squareback . . . . . 55,510 miles
Alexus - 1991 Lexus LS400 . . . 72,990 miles

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