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PostPosted: Sat Jun 08, 2013 5:58 pm 
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Joined: Sat Mar 23, 2013 8:25 am
Posts: 7
Location: danbury,ct
Hi all, Is there a thread where I can find info on how to troubleshoot a 280z 1985 that has not run in over 20 years! Cant get the engine to turn over. Has anyone had experience on resurrecting a car after many years of not running. Thanks in advance

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1983 280zx


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PostPosted: Sun Jun 09, 2013 1:09 am 
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Joined: Wed Apr 09, 2008 5:53 pm
Posts: 12934
Location: CT
You're in exactly the right place to ask that.

Engines which have sat for long periods and then refuse to turn over are usually "frozen" inside, meaning they've rusted.

Oil usually prevents this from happening but if the engine doesn't get turned at all for many years, ALL the oil drips down off the bearings and rings, and those dissimilar metals try to fuse together (rust).

Generally, if you expect to keep the engine for a long time and treat it properly from now on, you should disassemble it and hone the cylinder walls, replace the bearings and rings, and coat it with lightweight oil when you reassemble it.

If you don't care how much longer your engine lasts, or how much smoke it blows until you rebuild it, you can:
1) pull the cam cover and pour lightweight oil over the cam and valve train;
2) pull the spark plugs;
3) squirt about a tablespoon of penetrating oil into each cylinder (PB Blaster works well);
4) let it sit for a few days;
5) fit a breaker bar onto the crankshaft nut and GENTLY rock the crank back and forth until it breaks free.

Once it starts moving, add some lightweight (like 10W) oil into each cylinder again, then start pulling the engine thru slow complete revolutions by hand. That's breaking the rust off the cylinder walls and washing them clean(er) and freeing the muck in the crankshaft bearings.

The reason you want to turn it slowly by hand is to prevent spinning a bearing or breaking a ring. Don't be hasty and don't try to prove to the world how strong you are. This is a gentle operation.

After you have freed the engine, drain the oil and replace it with good stuff. Your starter should then turn the engine over as advertised.

Still, a professional would pull the engine down (disassemble it) and replace the bearings and rings. It's not a huge task, and it would show you if there was something broken inside, which was locking the engine up (instead of rust).

Frank

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1970 240Z


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 Post subject: Thanks frank
PostPosted: Sun Jun 23, 2013 5:04 pm 
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Joined: Sat Mar 23, 2013 8:25 am
Posts: 7
Location: danbury,ct
Thanks so much for some infinite wisdom on the matter. I don't know if its something I can handle. Might have to resort to professional. I can change other things such as rotors calipers hoses. The question now is when. Much appreciated. Marco

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1983 280zx


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PostPosted: Sun Jun 23, 2013 5:46 pm 
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Joined: Wed Apr 09, 2008 5:53 pm
Posts: 12934
Location: CT
You're very welcome.
If you got under the car and dropped the oil pan, you could search around inside the engine with a flashlight to see if it's anything more serious than rust. Popping the cam cover off would show if there was any physical damage to the valve train.

I once pulled-thru a seized 351 Ford V8 the way I described above. It drove for many more years and many thousands of miles. The key is being gentle when you break it free, so you preserve the rings and bearings.

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1970 240Z


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PostPosted: Mon Jun 24, 2013 8:07 am 
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Joined: Thu May 14, 2009 9:24 am
Posts: 1250
Location: Webster, NY
There were no 1985 280zs....

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John Taddonio
President, Z Car Club of Rochester NY
zcarnut@hotmail.com
FB: Zccr zcarclubofrochester


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PostPosted: Mon Jun 24, 2013 8:19 am 
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Joined: Wed Apr 09, 2008 5:53 pm
Posts: 12934
Location: CT
8) Ahhhhhh.......have I been had? :oops:

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1970 240Z


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PostPosted: Mon Jun 24, 2013 8:29 am 
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Joined: Sun Apr 01, 2012 4:19 pm
Posts: 1644
I think he corrected it in his post, calling it an 83. maybe he forgot the x also? 1983 280zx?


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