Re: PIstons and timing and TDC, oh my! - been thinking - Saab Sonett Bulletin Board - Saabnet.com
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Well, here's what the manual says...
1. Turn the engine such that when #1 piston is on the compression stroke, the timing mark on the balance shaft pulley lines up with 6 BTDC degree timing mark. Remove #1 spark plug to feel the compression being generated in #1 cylinder.
2. Turn the distributor rotor so that its mark is in alignment with the distributor body dot and insert the distributor. It will rotate slightly as it goes in. Check that the rotor now aligns with the line on the distributor body.
The other way to do it is to pull a valve cover, set the timing mark to 6 degrees BTDC and rock it back and forth a little. If the rocker arms on cylinder #4 are rocking, then cylinder #1 is on the compression stroke and you're good. If the rocker arms on cylinder #1 are rocking, then cylinder #4 is in compression and you'll have to rotate 180 degrees.
I've put them in 180 degrees out before and nothing terrible happens. The engine starts and backfires and you know you have it 180 out.
eric in vermont
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