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7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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Old 12-18-2009, 11:14 AM   #1 (permalink)
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Timing belt on the 7.3?

Is there a rubber timing belt on the 7.3 IDI or a timing chain? My truck is wrapping the 250k mark and everything I have replaced so far was from the factory. After owning a VW diesel (and knowing tossing the Tbelt = catastrophic failure) I figured I had better ask if the 7.3 IDI uses a rubber timing belt or not.
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Old 12-18-2009, 11:53 AM   #2 (permalink)
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It does not have a rubber timing belt.
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Old 12-18-2009, 12:10 PM   #3 (permalink)
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Quote:
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It does not have a rubber timing belt.
YUP!!! all gears intermeshed. nothing to stretch or replace
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Old 12-18-2009, 01:27 PM   #4 (permalink)
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ya heavy duty diesel applications are all gear driven so no timing belt or chain
but check to see it the ip is off if you have concerns
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Old 12-18-2009, 02:46 PM   #5 (permalink)
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ya heavy duty diesel applications are all gear driven so no timing belt or chain
but check to see it the ip is off if you have concerns
Awesome, thanks for all the input guys, lays that worry to rest for sure.

Im not really concerned about the timing of the motor (runs good, no smoke, etc) but I am a fan of preventative maintenance and figured I had better ask.
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Old 12-18-2009, 03:16 PM   #6 (permalink)
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Do check the serpentine belt often and replace at service interval. Tim
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Old 12-18-2009, 04:05 PM   #7 (permalink)
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I'm thinkin' his 88 has 4 v-belts like my 89 engine.
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Old 12-18-2009, 04:57 PM   #8 (permalink)
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yup I got the Vbelts too. Anybody know how to get the alternator drive belt to stop flopping wildly. It is as tight as it gets and still has this problem. I've heard some other people say it is a known problem and there really is no fix. Is this true?
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Old 12-18-2009, 04:59 PM   #9 (permalink)
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Do check the serpentine belt often and replace at service interval. Tim
when is the service interval?
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Old 12-18-2009, 05:02 PM   #10 (permalink)
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yup I got the Vbelts too. Anybody know how to get the alternator drive belt to stop flopping wildly. It is as tight as it gets and still has this problem. I've heard some other people say it is a known problem and there really is no fix. Is this true?
Gotta love that one huh.
If I put a new one on I can get it tight enough to not flop, but then it seems too tight for comfort.
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Old 12-18-2009, 06:06 PM   #11 (permalink)
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there was a guy that used to post on here--bajagringo--he mounted another flat pulley-----like a tensioner one, in the midway area on that belt to stop the flopping--if it does that bad enough--itll throw the belt
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Old 12-18-2009, 07:38 PM   #12 (permalink)
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Just snapped this pic. I mounted an idler pulley to a piece of flat stock (1/4 x 2 x 4) via drilled/tapped hole. Then simply welded it to the bottom of the alt. support bracket. Took care of virtually all the slop. You don't want to run belt to tight or it will prematurely wear items and could snap once the engine warms.

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Old 12-18-2009, 08:33 PM   #13 (permalink)
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Nice!
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Old 12-18-2009, 08:50 PM   #14 (permalink)
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Quote:
Originally Posted by StrokerSmoker7.3 View Post
. Anybody know how to get the alternator drive belt to stop flopping wildly.
There is a fix for this.I put a small pulley off of one of the water pump bolts on the left hand side. The most infamous "OkieGringo" came up with this idea a few years ago.it tightened up the belt just enough that it doesn't flop around hardly at all. Maybe the post is still around.(I still have a hard time with the search feature). Someone also came up with a shorter belt #.i'll search my computer and see if I saved that post.---Rob
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Old 12-18-2009, 10:56 PM   #15 (permalink)
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stroker gimme a call ill fab you up a idler if you want its not hard and its a waste for the most part unless its really bugging you
and stroker wasnt it youre vac belt?
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other mods, oba, warn winch, big steel goodies including a headache rack etc.

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