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#82601 09/06/2007 6:11 PM | Joined: Aug 2007 Posts: 17 New Guy | | New Guy Joined: Aug 2007 Posts: 17 | Have a 58 302CI Straight 6. Engine turns over but the distributor does not move. If the engine was in a small easy to reach truck I'd just rip into it but this is in a All Wheel Drive 450 GMC & you need a ladder for everything. My question is does the distributor drive off the oil pump or the cam? If it drives off the cam I'd pull the valve cover ( after getting a ladder...  )& see if the valves are moving/maybe bad cam gears or drive key. Does this engine have a timing chain???? If it drives off the oil pump then I'd pull the pan. Anybody have any hints on where to start? OH!! & the distributor itself is firmly engaged to whatever turns it/you can't turn the rotor... | | |
#82602 09/06/2007 6:29 PM | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | The 302 has the same distributor drive as all the GMC straight sixes and the Chevy 216/235 engines. It is driven by a gear off the cam. The distributor drives the oil pump. The distributor kind of floats in the hole, and if it pops up too high it disengages from the gear and the oil pump. You could have sheared off the roll pin to the distributor gear, or the cam gear could have broken. The 302 has a gear driven camshaft, and the gears are aluminum. It is really unlikely that those broke. www.oldgmctrucks.com is a good GMC info site.
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#82603 09/07/2007 1:01 AM | Joined: Feb 2004 Posts: 29,772 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,772 | Quick check; see if the fuel pump is pumping. The pump works off a lobe on the camshaft, and if the pump is working the cam is turning. Of course, you could pull the valve cover and see if the rocker arms are moving.
Assuming the cam is moving, you're probably dealing with a distributor gear out of mesh, or a stripped dizzy gear.
Jerry
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