1979-1993 & 94 Conv [Subscribe to Daily Digest] |
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A friend bought a 1994 Saab 900 S cabriolet automatic in beautiful condition.
He said low miles, though I didnât look.
Apparently, It was leaking some oil and coolant on the intake side of the headgasket. My friend removed the camshaft cover, A/C compressor, both manifolds, etc, and then called me, since heâd never done a 16v headgasket before.
When I got to the car, flywheel degree mark was at zero, (he said thatâs where the engine had stopped!). Camshaft positions, however, were about 90 degrees late for #1 piston TDC compression stroke position. Way, way too much for a stretched chain, I thought, so we pulled the tensioner spring, the tensioner, and measured the âpushoutâ. Less than 10mm, so not too bad, but getting up there. I bumped up the crankshaft until both camshaft markings were in exactly the right position, all valves on #1 closed, and #1 lobes facing away from each other.
Then, I looked at the flywheel again. Saw another aluminium attachment, similar to the one with the degrees marked on it, and with marks, but no discernible numbers. For future reference, I put a whiteout mark at this ânew zero,â logically diametrically opposite the ânormal zeroâ.
In all my previous head jobs, the ânormal zeroâ and camshaft(s) marks always lined up (as I recall!).
Head went to headshop, and shaved flat. I then reinstalled it with new gasket, though old one looked perfect.
Unless Iâm missing something obvious (possible, at seventy?) my only surmise is that the present chain was installed 180 degrees off on the crankshaft sprocket. Wouldnât do any harm, but then how does one time the ignition? Just in case, Iâll put a different colour mark at the 16 (or whatever) degrees BTDC position.
Iâm busy as hell, so wonât be firing it up for a few days.
Iâd love to hear some opinions on this curio!
Peter
posted by 154.5.3...
, Mon, 29 Nov 2010 15:10:38
, Mon, 29 Nov 2010 07:54:57
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