Date: 20 Aug 1997 23:19:02 -0400 From: kenbellnopsamx.com (Ken Bell) Subject: Re: hot hot hot 900
In article <33FB5601.6FCAnopsam.salford.ac.uk>, A.R.Gibbons <AMS303nopsam.salford.ac.uk> wrote: >Why does my 82 900 gls keep overheating when bombing down the motorway. > >I suspect that the timing is too advanced. Could this be the cause. Or >perhaps the thermostat. > >Also I don't have a manual and I don't know how to check the timing. This is based on an '88 9000, but I think your engine is similar. Hopefully you know how to connect up a tachometer; on the 9000 there is a test socket on the engine compartment bulkhead, driver's side, under a plastic cap. Pin #5 (I think) of the round socket is the tach signal, counting clockwise from the "dead" space, i.e., O 5 1 4 2 3 Set your tach, of course, for 4 cylinders. Then, assuming (hoping) you have an inductive pickup on your timing light, connect it to the spark plug wire for cylinder #1, preferably near to the distributor cap. There is a timing scale on the engine flywheel, and it rotates with the flywheel (unlike most other cars where the scale is stationary, outside of the engine). There is a "window" in the transmission bell housing that lets you see a bit of the flywheel; if the flywheel is rotated just right, you can also see the scale. There is a line cast into the bell housing near the center of this window, and it is used as the "pointer" for the scale. Shine your timing light into the window in the bell housing and you should see the scale and understand what I'm trying to describe here. To adjust the timing, of course, you loosen the holddown bolt on the distributor cap and turn the cap, just a couple of degrees, clockwise to retard the timing and counterclockwise to advance it Watch your fingers, or do it with the engine shut off. Tighten the holddown bolt of course when you're satisfied, and recheck the timing. The timing should be set with the distributor vacuum line removed from the distributor and plugged (assuming that your car has this). Engine speed should be just about 850 rpm. When you raise the speed to about 2,000 rpm, you should see the timing advance several degrees. On the 9000, the timing is set (at 850 rpm) to 16 degrees BTDC. Check the distributor vacuum port also with a vacuum pump/gauge tester to make sure that the diaphram isn't leaking. -- Ken Bell :: kenbellnopsamx.com :: (212) 475-4976 (voice) ======== :: syklbnopsam.nasa.gov :: (212) 678-5516 (voice), 678-5552 (fax)
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