Date: Fri, 11 Apr 2008 14:21:32 -0700
Reply-To: Zoltan Kuthy <zolo@FOXINTERNET.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Zoltan Kuthy <zolo@FOXINTERNET.NET>
Subject: Wrong answer; Re: Why are the lifters so hard?
In-Reply-To: <068f01c89c0f$03141770$0a00a8c0@OWNERMIKE>
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reply-type=response
Mike is saying that loosing oil pressure is a common happening and not to be
too surprised of it.
We are talking about the opposit here.
We say, that we would like it to loose pressure, because its too hard and
won't leak down to be able to have any turn to adjust.
I kept on having the same wrong replies from guys, obviously
misunderstanding the request.
But we don't give up, the search for a solution continues.
Zoltan
----- Original Message -----
From: "Mike" <mbucchino@CHARTER.NET>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Friday, April 11, 2008 1:02 PM
Subject: Re: Why are the lifters so hard?
> The lifters will, in fact, normally bleed down a little bit (sometimes
> alot!) when left not running overnight or for a few days or so. Yes, it's
> not a perfect seal (neither the lifter piston/ cylinder walls, nor the
> check
> ball), so some oil does escape by seepage.
> I've driven bay window busses and Vanagons, both air- and water-cooled,
> with high mileage engines, and they've always had a bit of lifter clatter
> when first starting them up after a period of sitting. My newer WBX has
> never clattered yet, I suspect it's due to being a low mileage. all
> original
> engine.
> That flat-four configuration is famous for having this trait.
>
> YMMV,
>
> Mike B.
>
>>
>> A follow up question is, just how do the lifters "settle" after pre-
>> loading them? The only way the piston can drop further into the lifter
>> body is if some of the oil located in the valve body, but below the
>> piston, is removed. As long as the check valve on the bottom of the
>> piston is working, the only exit route for this oil is between the inside
>> wall of the lifter body and the outside wall of the piston, ultimately
>> exiting the oiling oil on the side of the lifter body.
>>
>> It is tempting to manually remove some oil from the lifter body so that
>> when they are adjusted to +1 there is enough give to prevent the valves
>> from opening. Then run the motor and let them "pump up" to the proper
>> height. I suppose this risks trapping air in the lifters resulting in
>> the
>> performance problems Bob refers to in his "history of hydraulic lifters"
>> article.
>>
>> Yeah, I know, beating a dead horse and all. I have read the heck out of
>> the archives and I still don't get it.
>>
>> jake
>> 82 AC Westy
>>
>
>
> --
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