Something else I left out, in regards to the cylinder head being off the
engine:
I placed a large piece of cardboard on the table top, with 2x4 pieces of
wood to support the cylinder head at the front and rear. This will preserve
the bottom head surface and keep it from getting damaged, and will also
allow air space for movement of the valves as you use the pry bar to press
down on the valve springs.
If the cylinder head is still on the engine, you need to be careful that
the piston top not interfere with open valves. Best way: keep the camshaft
gear and timing chain in place so the cam properly moves with the
crankshaft, and only remove the rocker arms for each cylinder when you are
absolutely sure that the piston is moved down and away from Top Dead
Center. Only after all rockers are removed, then you can safely dismount
the camshaft gear and screw it onto the timing guide keeper position (top
of the "Evil-L").
Why would you remove the rocker arms with the cylinder head still on the
engine? I did this so I could check that the camshaft was free-spinning and
not hung-up, while I re-torqued the head bolts.
Fred
_____________________ Reply Separator _________________________
Subject: Re: rocker arm removal
Author: Fred_Katz@ci.sf.ca.us
Date: 10/29/99 2:18 PM
Hi Stephan,
Give me a call, and I'll come over tonight or tomorrow. I've got a pry bar
that works great. You rotate the cam so the in and out ears are up. Then
place the end of the pry bar against the side top of the valve springs, and
leverage the mid-section of the pry bar against the underside of the
camshaft. It doesn't take much pressure at all, and the camshaft can easily
tolerate it. Since you removed the head, there's no question about piston
interference.
Keep the prybar away from the cam lobes. Once the valve springs are pressed
down, you use your free hand to slide out the rocker arms.
Get an empty egg carton, and a marking pen. Mark the egg carton for each
rocker, starting with #1E, #1I, #2I, #2E, #3E, #3I, #4I, #4E.
As you remove each rocker, wipe it and mark it accordingly with the marker
and place it in the egg carton. Also note the position of the "buttons"
under the rockers, on top of the valves. Wipe each and mark the front
position so you can match it up with the rocker arm, and place it in the
egg carton.
Fred
>Subject: rocker arm removal
>Author: "Sochoux; Stephan" <SSochoux@dbc.com>
>Date: 10/29/99 12:40 PM
>
>Hello all,
>
>I'm trying to remove the rocker arms on my U20 and i'm not making much
>progress. To start with, the head is off the engine and on the workbench.
>I've removed the little retainer springs on the rocker arms which give them
>some free play. It's not enough to slide them out. I can't see any pivot
>point to use to push the valve springs down without damaging the head. Do i
>just remove the cam bearing caps ? It seems to me to would put a lot of
>pressure on the cam and on the remaining caps. How is it done ?
>
>Thanks-
>
>Stephan.
>'69 2000 in repair
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