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Unread 03-08-2013, 04:22 PM   #1
billybob535
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1974 CJ6 
 
Join Date: Mar 2011
Location: Shallotte, NC
Posts: 399
Reviving an engine that has sat for 2 years

The factory 304 V8 in my 74 CJ6 ran when I parked it for a frame off teardown. It has been in the chassis and wrapped in a tarp to keep the elements out. I am sure some moisture and salt air have found its way in through the exhaust and carb. I was told that I should remove the plugs and squirt marvel mystery oil or another heavy penetrating oil in the cylinders and let it sit for a day before turning it over. Is that the best way or can I do something better? The block had a freeze plug pulled before storage so it has nothing but oil in it.

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74 CJ6 - 304/TF-999/D300/D30/D44 - build in progress
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Unread 03-08-2013, 04:48 PM   #2
AKjeff
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1974 CJ5 
 
Join Date: May 2009
Location: Carson Valley
Posts: 29
If it were mine I would put a couple shots of engine oil in each plug hole and let it sit for a few hours. Then see if it turns over by hand.
Once it turns over by hand, disable the ignition and turn it over with the starter for about 15 to 20 seconds. Let the starter cool down and do it again.

Once you have oil pressure, add fresh gas and plugs and see if she'll fire.
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Unread 03-09-2013, 03:20 AM   #3
RWise
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1981 CJ5 
 
Join Date: Mar 2012
Location: Oakhurst, Oklahoma
Posts: 574
I myself will not wrap one in a tarp again, to much condensate forms inside the engine block. I would suggest pulling the oil plug and letting out any water that is in the bottom of the oil pan before turning it over. IF the engine is locked up I would use DOT 3 or ATF to free it.
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Unread 03-09-2013, 07:06 AM   #4
davbytrace
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1979 CJ7 
 
Join Date: May 2011
Location: clinton, MS
Posts: 479
Yes. Marvel mystery oil is a good choice. Good plan. I would also drain the fuel system though and change the oil and fuel filter beforehand.
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Unread 04-07-2013, 05:54 PM   #5
billybob535
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1974 CJ6 
 
Join Date: Mar 2011
Location: Shallotte, NC
Posts: 399
I have no fuel system right now (doing a frame off) so nothing to drain. I was waiting on some primer to dry so I stuck the breaker bar on the balancer bolt and turned the motor just a tiny bit to make sure it wasn't locked up. I will pull the plugs and shoot some penetrating oil in when its motor time.

Thanks
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