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6.9L Diesels Technical discussion of topics related to vehicles powered by the 6.9 Liter In-Direct Injection Navistar engines.

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Old 08-17-2013, 12:12 PM   #1 (permalink)
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locked up motor

Went to go start the truck on tuesday and it gave half a turn and wouldnt go any more. I let it sit for the week replaced the starter today and it still did the same thing. I cant turn motor clockwise by hand at a certain point but if i turn counter clockwise a can get the motor to turn over a few times before it locks up again. Any suggestions on what to do. I've pulled all the belts off the motor, removed the starter and the trans is in neutral.

Any suggestions would be great

1985 cclb 6.9 at 172k
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Old 08-17-2013, 02:09 PM   #2 (permalink)
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I'd start by pulling all the glow plugs and seeing if you can turn it over then and watch for fluid coming out of the glow plug holes. Then determine what has come out if you can. Determine weather it is antifreeze/coolant, fuel, or oil.
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Old 08-17-2013, 03:39 PM   #3 (permalink)
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Turn it over by hand.


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Old 08-17-2013, 07:42 PM   #4 (permalink)
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So I pulled all the glow plugs and on the passenger side cylinder closest to the firewall was fill with what I'm pretty damn sure is rain water. I drove the truck monday night. It poured tuesday and it wouldnt start friday. I shop vacced out the glow plug hole put everything back together and it fired almost right up. ran with a slight miss untill is spat water out the exhaust pipe and then ran fine.

Any ideas where im getting rain water entering the motor
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Old 08-17-2013, 08:31 PM   #5 (permalink)
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Probably the air cleaner cover.


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Old 08-17-2013, 11:32 PM   #6 (permalink)
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Must be.

You'll need to replace the hood sealing strip also if this is happening. I bought a new one but having done that I think I would make one myself if I had it to do again from some garage door sealing urethane foam strip, a 4' piece of flat aluminum extrusion 1/8" thick, and 4' of urethane double-sided foam tape sold for gap sealing etc in automotive applications, 1/8" thick. The OE unit is not very robust. Mine came new from Ford in a sealed bag with the part top and center twisted so that it wouldn't seal anyway! I had to twist it into the proper shape, and damaged the foam tape in the process, so I had to replace that...
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Old 08-18-2013, 10:49 AM   #7 (permalink)
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I would keep a watch on the cooling system. A friend of mine had the same thing happen to his 88 f-250 when he had it parked on an incline with the nose downhill. Water got into the intake and it hydrolocked when he tried to start it. He found out that it blew the headgasket after he got it running and was on his way to work.

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Old 08-18-2013, 10:32 PM   #8 (permalink)
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Quote:
Originally Posted by chuckster57 View Post
Probably the air cleaner cover.


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X2, there have been posts in the past about this happening.
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