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From: ccrse@ucdavis.UUCP (0058)
Newsgroups: net.auto.tech
Subject: Re: Valve Adjustment on 1975 Opel Manta (1900)
Message-ID: <8@ucdavis.UUCP>
Date: Fri, 3-Jan-86 12:07:08 EST
Article-I.D.: ucdavis.8
Posted: Fri Jan  3 12:07:08 1986
Date-Received: Sat, 4-Jan-86 03:29:00 EST
References: <715@abic.UUCP>
Distribution: na
Organization: University of California, Davis
Lines: 23

> 
> 	How do you adjust valves on this beast?  The GM repair
> manual says to adjust them until there is no play between the
> rocker arm and the valve stem and the lifter.  Then tighten down
> one full turn....
>   ....How do you really do it?  This car's valves are really
> noisy.

	If I recall correctly from the last time I did my Opel's head,
this sounds like the method that I used.  It worked fine for me.
	If your valves are *that* noisy, please note that the car uses
hydraulic lifters, so your valves should never get very noisy
unless one or more of them has "popped".  If this has occurred, the
lifter no longer provides any tension on the rocker arm, so when you
tightened it till there was no play, you had direct metal-to-metal
contact.  Attempting to tighten any distance beyond that point would
be difficult indeed, and would probably result in the valve(s) being
locked in the open position, i.e. car won't start.
	Another problem with the valve adjustment on these engines is
that the adjusting nut on each rocker arm is a crimped nut, and they
tend to loose their tightness with time and/or use.  If I recall
correctly, the factory manual said you should replace these with each
adjustment.  You might want to look into these as well.