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Old 12-14-2007, 07:32 PM   #11
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Location: New England
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Year: 1993
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Engine: DT466/MT643
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Re: 7.3l Diesel Allison Automatic

Check 2 things here:

1) Thermostat. This is a noted trouble spot for the 7.3 diesel. There are a bunch of bad ones out there. Try replacing it, it might be the problem. Note: these engines run 200-210 degrees. This is normal & harmless.

2) Glow plug system. You might only be getting the light. This is another known trouble spot. Lots of people have bypassed the relay system & wired them to a manual switch. Beware, these are 6V plugs and are easy to burn out if left on too long (keep it under 30 seconds at a time).

You might well have a perfectly good engine.
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Old 12-15-2007, 09:55 AM   #12
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Re: 7.3l Diesel Allison Automatic

Originally Posted by phillbus914
Word of caution: Never use starting fluid on an engine with glow plugs. The starting fluid could ignite and explode.


there have been stories of intake manifolds getting blown right off of the engine because of starting fluid ignited by glowplugs.
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Old 12-16-2007, 01:38 AM   #13
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Re: 7.3l Diesel Allison Automatic

My 7.3 runs pretty warm. Around 190 to 200 degrees is normal it seems. If I'm really getting on it on the highway, it will get to around 210.
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