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Old 02-20-2011, 10:51 AM
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Humble E34 lover
Location: Asheboro, NC
Join Date: Dec 2008
Posts: 5,477
Mein Auto: 1992 525i
Originally Posted by ricks5series View Post
I've been doing some research and there seems to be two schools of thought on this subject.

Presoak or not.
Here is something I found in another forum.

Do Hydraulic Lifters Need to be Primed with Oil?
Many people mistakenly believe that hydraulic lifters must be soaked in oil overnight and be hand pumped up with a pushrod before installing into a new engine, however this is not necessary. In fact, this could cause the lifter to act as a "solid" and prevent obtaining proper preload. What is very necessary is the priming of the entire engine's oil system before starting up a new engine for the first time. This is done by turning the oil pump with a drill motor to force oil throughout the entire engine.

I'm going to install them without presoaking them. The possibility of causing a solid condition makes sense to me.
I suppose the priming of the engine (as I have seen them do on Horsepower TV) primes the lifters properly.

Most problems are usually something simple !

Originally Posted by noego View Post
It's Deja Poo - as in, I've heard this **** before.

Calypso Red 1992 525i with 225K miles

1991 735i - Sold
1992 525i - Sold
1995 325is - Sold
2000 528i - Sold

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