Re: E30 Engine setup

["Ron Buchalski" <rbuchals@xxxxxxxxxxx>]

Tom,

The crankshaft rotates twice for each complete combustion cycle, so when 
piston #1 is at TDC for the compression stroke, it's no different than if 
it's at TDC for the exhaust stroke.

It's the relationship of the camshafts to the crankshaft that determines 
which stroke is taking place at that time.  For TDC of the compression 
stroke, both valves for that cylinder will be closed.  For TDC of the 
exhaust stroke, the exhaust valve will be open.  (I know that cam overlap 
changes these slightly, but it's true for basic theory).

So, if you set piston #1 for TDC, and then rotate the cams for the proper 
TDC position (valves closed), you should be fine.  Also, the cam and crank 
gears should have timing markers on them.  The gears are keyed, so you can't 
install them improperly.


Ron Buchalski
BMWCCA #76387
1995 E36 M3
1993 E34 525iT
1999 Mazda Miata

>
>Date: Tue, 20 May 2003 08:39:33 EDT
>From: Tdb1946@domain.elided
>Subject: E30 Engine setup
>
>I removed cylinder head in 91 325i to repair belt break damage. Would
>appreciate advice on how to set engine and head(valves)up to reinstall 
>head.
>I assume crankshaft should be turned till #1 piston is at TDC? How does one
>confirm this with head off, assure piston is on compression stroke? How
>should camshaft be set, valves positioned, for proper timing? I assume all
>this is a visual thing, so what do I need to SEE to be sure setup is right 
>?
>Hope these questioins make sense! Any secret to torquing head bolts 
>properly?
>Thanks for help!
>Tom
>

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