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Unread 06-03-2012, 06:24 PM   #1
jsmoe
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Distributor rotor does not turn

I am fixing up a 1980 CJ5 with the GM 151 4-cylinder engine.

The engine overheated while driving and turned off as I coasted to a stop.

The engine will not start but does turn over and is not seized. I checked the plugs and was not getting a spark. I pulled the distributor cap and the distributor rotor does not turn when the the engine is cranked (by starter or manually).

It does not seem to be the timing belt as I can crank the engine and determine TDC on piston #1.

I have not pulled the distributor as I didn't want to mess up the timing, but that is my next move.

Any suggestions or comments would be appreciated.

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Unread 06-03-2012, 06:31 PM   #2
scottymac62
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Timing is useless to you if your dizzy is not spinning. Yank that baby out and see if its the dizzy gear or your cam gear that is messed up.
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Unread 06-03-2012, 07:11 PM   #3
hutch1200
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"It does not seem to be the timing belt as I can crank the engine and determine TDC on piston #1"-jsmoe
Doesn't that just mean the piston is still connected to the crank? Or did you pull the valve cover to make sure the intake is closed near TDC? I may be a moron and missing something, so please don't take this as me being snarky.
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Unread 06-03-2012, 07:22 PM   #4
gojeepgo
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Turning the crank by hand will still make the piston go up and down in the bore even if the timing chain is broken. It is possible the cam is not turning as you crank the engine which would indicate the timing chain is broken. The dizzy turns via a gear on the camshaft. You can pull the valve cover off and turn the engine by hand. If the valves are not moving then the chain is broken.
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Unread 06-04-2012, 07:37 AM   #5
Pacfanweb
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Finding TDC has nothing to do with the timing belt/chain, you can do that with just a crank in a block.

Now if you're talking about finding the compression stroke, the belt/chain has to be intact for that to happen.

Pull your oil filler cap off (assuming it's in the valve cover) and have someone crank the engine....you'll be able to see if the rocker arms/valves are moving, that'll tell you if your belt is still on.
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cj5 , distributor , overheated , rotor , turn

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